CAP1214-1-EZK-TR - Microchip Technology

SMSC CAP1214 DATASHEET Revision 1.0 (08-30-10)

Datasheet

PRODUCT FEATURES

CAP1214

Multiple Channel Capacitive Touch Sensor

and LED Driver

General Description

The CAP1214 is a multiple channel Capacitive Touch

sensor and LED Driver.1

The CAP1214 contains up to fourteen (14) individual

Capacitive Touch sensor inputs with programmable

sensitivity for use in touch button and slider switch

applications. Each sensor input contains automatic

recalibration with programmable time delays.

The CAP1214 includes compensation circuitry that

provides uniform touch sensitivity across a wide range

of external sensing pad capacitance.

The CAP1214 also contains eleven (11) low side LED

drivers that offer full-on / off, variable rate blinking,

dimness controls, and breathing. LED outputs can be

linked to capacitive sensor channels.

Applications

Consumer Electronics

Desktop and Notebook PCs

LCD Monitors

Features

Fourteen (14) capacitive touch sensor inputs

— Compensates for variable sensing pads

— Programmable sensitivity

— High SNR allows for easy tuning

— Automatic recalibration

— Slider acceleration and position detection

— Proximity detection

Lid closure detection

Low power operation

— 4.5uA quiescent current in Deep Sleep

— 250uA quiescent current in Sleep, monitoring 1 button

FEEDBACK pin can drive a piezo transducer when a

touch is detected

User controlled reset

Low external component count

SMBus 2.0 compliant interface to change operating

parameters to work in a wide variety of systems

— Block Read and Write function for quick tasking

Eleven (11) LED driver outputs

— Programmable blink, breathe, and dimness controls

— 8 configurable as GPIOs

— LEDs can be linked to capacitive sensor channels

Development boards and software available

Available in 32-pin 5mm x 5mm QFN Lead-free

RoHS Compliant package

Block Diagram

1. SMSC and the SMSC logo are registered trademarks and

SMSC RightTouch is a trademark of Standard Microsystems

Corporation ("SMSC").

SMBus

Slave

Protocol

SMCLK

SMDATA

VDD GND

ALERT

Capacitive Sensing Algorithm

LED Blink, Breathe, and Dimness control

LED1

LED2

LED3

LED4

LED5

LED6

LED7

LED8

LED9

LED10

LED11

CS1

CS2

CS3

CS4

CS5

CS6

CS7

CS8

CS9

CS10

CS11

CS12

CS13

CS14

RESET

FEEDBACK

REEL SIZE IS 4,000 PIECES

This product meets the halogen maximum concentration values per IEC61249-2-21

For RoHS compliance and environmental information, please visit www.smsc.com/rohs

ORDERING NUMBER PACKAGE FEATURES

CAP1214-1-EZK-TR 32-Pin QFN 5mm x 5mm

(Lead Free RoHS compliant)

Fourteen Capacitive Touch Sensors.

Eleven LED drivers. SMBus

communications.

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.0 (08-30-10) 2 SMSC CAP1214

DATASHEET

80 ARKAY DRIVE, HAUPPAUGE, NY 11788 (631) 435-6000, FAX (631) 273-3123

Circuit diagrams and other information relating to SMSC products are included as a means of illustrating typical applications. Consequently, complete

information sufficient for construction purposes is not necessarily given. Although the information has been checked and is believed to be accurate,

no responsibility is assumed for inaccuracies. SMSC reserves the right to make changes to specifications and product descriptions at any time without

notice. Contact your local SMSC sales office to obtain the latest specifications before placing your product order. The provision of this information

does not convey to the purchaser of the described semiconductor devices any licenses under any patent rights or other intellectual property rights of

SMSC or others. All sales are expressly conditional on your agreement to the terms and conditions of the most recently dated version of SMSC's

standard Terms of Sale Agreement dated before the date of your order (the "Terms of Sale Agreement"). The product may contain design defects or

errors known as anomalies which may cause the product's functions to deviate from published specifications. Anomaly sheets are available upon

request. SMSC products are not designed, intended, authorized or warranted for use in any life support or other application where product failure

could cause or contribute to personal injury or severe property damage. Any and all such uses without prior written approval of an Officer of SMSC

and further testing and/or modification will be fully at the risk of the customer. Copies of this document or other SMSC literature, as well as the Terms

of Sale Agreement, may be obtained by visiting SMSC’s website at http://www.smsc.com. SMSC is a registered trademark of Standard Microsystems

Corporation (“SMSC”). Product names and company names are the trademarks of their respective holders.

SMSC DISCLAIMS AND EXCLUDES ANY AND ALL WARRANTIES, INCLUDING WITHOUT LIMITATION ANY AND ALL IMPLIED WARRANTIES

OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND AGAINST INFRINGEMENT AND THE LIKE, AND ANY AND

ALL WARRANTIES ARISING FROM ANY COURSE OF DEALING OR USAGE OF TRADE. IN NO EVENT SHALL SMSC BE LIABLE FOR ANY

DIRECT, INCIDENTAL, INDIRECT, SPECIAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES; OR FOR LOST DATA, PROFITS, SAVINGS OR

REVENUES OF ANY KIND; REGARDLESS OF THE FORM OF ACTION, WHETHER BASED ON CONTRACT; TORT; NEGLIGENCE OF SMSC

OR OTHERS; STRICT LIABILITY; BREACH OF WARRANTY; OR OTHERWISE; WHETHER OR NOT ANY REMEDY OF BUYER IS HELD TO

HAVE FAILED OF ITS ESSENTIAL PURPOSE, AND WHETHER OR NOT SMSC HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH

DAMAGES.

Ordering Information:

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1214 3 Revision 1.0 (08-30-10)

DATASHEET

Table of Contents

Chapter 1 Pin Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Chapter 2 Delta from CAP1114 to CAP1214 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2.1 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2.2 Register Delta . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Chapter 3 Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Chapter 4 Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

4.1 System Management Bus Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

4.1.1 SMBus Start Bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

4.1.2 SMBus Address and RD / WR Bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

4.1.3 SMBus Data Bytes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

4.1.4 SMBus ACK and NACK Bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

4.1.5 SMBus Stop Bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

4.1.6 SMBus Time-out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

4.1.7 SMBus and I2C Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

4.2 SMBus Protocols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

4.2.1 SMBus Write Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

4.2.2 Block Write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

4.2.3 SMBus Read Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

4.2.4 Block Read . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

4.2.5 SMBus Send Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

4.2.6 SMBus Receive Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Chapter 5 Product Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

5.1 Power States . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

5.2 RESET Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

5.3 LED Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

5.3.1 Linking LEDs to Capacitive Touch Sensors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

5.4 Capacitive Touch Sensing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

5.4.1 Multiple Button Presses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

5.4.2 Lid Closure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

5.4.3 Grouped Sensors (CS8 - CS14) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

5.4.4 Sensing Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

5.4.5 Proximity Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

5.4.6 Recalibrating Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

5.4.7 Low Frequency Noise Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

5.4.8 RF Noise Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

5.5 Grouped Sensor Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

5.5.1 Tap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

5.5.2 Press and Hold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

5.5.3 Slider . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

5.5.4 Relative Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

5.5.5 Slider Velocity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

5.6 Ungrouped Sensor Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

5.6.1 CS9 - CS13 Ungrouped Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

5.6.2 CS8 and CS14 Ungrouped Behavior. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

5.7 FEEDBACK Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

5.8 ALERT Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

5.8.1 Button Interrupt Behavior. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.0 (08-30-10) 4 SMSC CAP1214

DATASHEET

5.8.2 Grouped Sensor Interrupt Behavior. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Chapter 6 Register Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

6.1 Main Status Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

6.2 Button Status Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

6.2.1 Button Status 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

6.2.2 Button Status 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

6.3 Build Revision Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

6.4 Slider Position / Volumetric Data Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

6.4.1 Absolute Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

6.4.2 Volumetric Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

6.5 Vendor ID Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

6.6 Volumetric Step Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

6.7 Noise Status Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

6.8 Lid Closure Status Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

6.9 GPIO Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

6.10 Group Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

6.11 Sensor Delta Count Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

6.12 Queue Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

6.13 Data Sensitivity Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

6.14 Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

6.15 Sensor Enable Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

6.16 Button Configuration Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

6.17 Group Configuration Register 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

6.18 Group Configuration Register 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

6.19 Calibration Enable Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

6.20 Calibration Activate Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

6.20.1 Calibration Activate - 26h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

6.20.2 Grouped Sensor Calibration Activate - 46h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

6.21 Interrupt Enable Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

6.21.1 Interrupt Enable 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

6.21.2 Interrupt Enable 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

6.22 Sleep Channel Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

6.23 Multiple Touch Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

6.24 Lid Closure Configuration Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

6.25 Lid Closure Queue Control Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

6.26 Lid Closure Pattern Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

6.27 Recalibration Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

6.28 Sensor Threshold Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

6.29 Button Noise Threshold Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

6.29.1 Button Noise Threshold 1 Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

6.29.2 Button Noise Threshold 2 Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

6.30 Lid Closure Threshold Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

6.30.1 Lid Closure Threshold 1 Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

6.30.2 Lid Closure Threshold 2 Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

6.30.3 Lid Closure Threshold 3 Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

6.30.4 Lid Closure Threshold 4 Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

6.31 Slider Velocity Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

6.32 Digital Recalibration Control Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

6.33 Configuration 2 Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

6.34 Grouped Sensor Channel Enable Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

6.35 Proximity Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

6.36 Sampling Channel Select Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

6.37 Sampling Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

6.38 Sensor Base Count Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1214 5 Revision 1.0 (08-30-10)

DATASHEET

6.39 LED Status Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

6.39.1 LED Status 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

6.39.2 LED Status 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

6.40 Feedback Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

6.41 Feedback Channel Configuration Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

6.41.1 Feedback Channel Configuration 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

6.41.2 Feedback Channel Configuration 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

6.42 Feedback One-Shot Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

6.43 LED / GPIO Direction Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

6.44 LED / GPIO Output Type Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

6.45 GPIO Input Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

6.46 LED Output Control Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

6.46.1 LED Output Control 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

6.46.2 LED Output Control 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

6.47 LED Polarity Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

6.47.1 LED Polarity 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

6.47.2 LED Polarity 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

6.48 Linked LED Transition Control Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

6.48.1 Linked LED Transition Control 1 - 77h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

6.48.2 Linked LED Transition Control 2 - 78h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

6.49 LED Mirror Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

6.49.1 LED Mirror Control 1 - 79h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

6.49.2 LED Mirror Control 2 - 7Ah . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

6.50 Sensor LED Linking Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

6.51 LED Behavior Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

6.51.1 LED Behavior 1 - 81h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

6.51.2 LED Behavior 2 - 82h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

6.51.3 LED Behavior 3 - 83h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

6.52 LED Pulse 1 Period Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

6.53 LED Pulse 2 Period Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

6.54 LED Breathe Period Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

6.55 LED Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

6.56 LED11 Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

6.57 LED Pulse and Breathe Duty Cycle Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

6.58 LED Direct Ramp Rates Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

6.59 LED Off Delay Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

6.60 Sensor Calibration Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99

6.61 Product ID Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

6.62 Revision Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

Chapter 7 Package Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

7.1 Package Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

7.2 Package Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106

Chapter 8 Datasheet Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.0 (08-30-10) 6 SMSC CAP1214

DATASHEET

List of Figures

Figure 1.1 CAP1214 Pin Diagram (32-Pin QFN). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Figure 4.1 SMBus Timing Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Figure 5.1 System Diagram for CAP1214 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Figure 5.2 Button Interrupt Behavior - Repeat Rate Enabled . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Figure 5.3 Button Interrupt Behavior - No Repeat Rate Enabled . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Figure 5.4 Tap Interrupt Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Figure 5.5 Press and Hold Interrupt Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Figure 5.6 Slide Interrupt Behavior - No Acceleration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Figure 5.7 Slide Interrupt Behavior - Acceleration Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Figure 6.1 Pulse 1 Behavior with Touch Trigger and Non-inverted Polarity . . . . . . . . . . . . . . . . . . . . . . 90

Figure 6.2 Pulse 1 Behavior with Touch Trigger and Inverted Polarity . . . . . . . . . . . . . . . . . . . . . . . . . . 90

Figure 6.3 Pulse 2 Behavior with Non-Inverted Polarity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

Figure 6.4 Pulse 2 Behavior with Inverted Polarity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

Figure 6.5 Breathe Behavior with Non-Inverted Polarity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

Figure 6.6 Breathe Behavior with Inverted Polarity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

Figure 6.7 Direct Behavior for Non-Inverted Polarity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99

Figure 6.8 Direct Behavior for Inverted Polarity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99

Figure 7.1 Package Diagram - 32-Pin QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

Figure 7.2 Package Dimensions - 32-Pin QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

Figure 7.3 Package PCB Land Pattern and Stencil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104

Figure 7.4 Package Detail A - Stencil Opening and Perimeter Lands. . . . . . . . . . . . . . . . . . . . . . . . . . 104

Figure 7.5 Package Detail B - Thermal Vias and Stencil Opening . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

Figure 7.6 Package Land Pattern Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

Figure 7.7 Package Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1214 7 Revision 1.0 (08-30-10)

DATASHEET

List of Tables

Table 1.1 Pin Description for CAP1214 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Table 1.2 Pin Types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Table 2.1 Register Delta . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Table 3.1 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Table 3.2 Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Table 4.1 Protocol Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Table 4.2 Write Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Table 4.3 Block Write Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Table 4.4 Read Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Table 4.5 Block Read Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Table 4.6 Send Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Table 4.7 Receive Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Table 5.1 Power States . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Table 6.1 Register Set in Hexadecimal Order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Table 6.2 Main Status Control Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Table 6.3 Button Status Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Table 6.4 Build Revision Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Table 6.5 Slider Position / Volumetric Data Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Table 6.6 Example Slider Absolute Position Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Table 6.7 Vendor ID Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Table 6.8 Volumetric Step Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Table 6.9 Noise Status Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Table 6.10 Lid Closure Status Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Table 6.11 GPIO Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Table 6.12 Group Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Table 6.13 Sensor Delta Count Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Table 6.14 Queue Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Table 6.15 QUEUE_B Bit Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Table 6.16 Data Sensitivity Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Table 6.17 DELTA_SENSE Bit Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Table 6.18 BASE_SHIFT Bit Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Table 6.19 Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Table 6.20 Sensor Enable Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Table 6.21 Button Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Table 6.22 MAX_DUR_B and MAX_DUR_G Bit Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Table 6.23 RPT_RATE_B / SL / PH Bit Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Table 6.24 Group Configuration Register 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Table 6.25 M_PRESS Bit Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Table 6.26 Group Configuration Register 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Table 6.27 Calibration Enable Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Table 6.28 Calibration Activate Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Table 6.29 Interrupt Enable Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Table 6.30 Sleep Channel Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Table 6.31 Multiple Touch Configuration Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Table 6.32 B_MULT_T Bit Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Table 6.33 G_MULT_T Bit Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Table 6.34 Lid Closure Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

Table 6.35 Lid Closure Queue Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

Table 6.36 Lid Closure Pattern Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

Table 6.37 Recalibration Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

Table 6.38 NEG_DELTA_CNT Bit Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

Table 6.39 CAL_CFG Bit Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

Table 6.40 Sensor Threshold Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.0 (08-30-10) 8 SMSC CAP1214

DATASHEET

Table 6.41 Button Noise Threshold Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

Table 6.42 CSx_BN_TH Bit Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

Table 6.43 Lid Closure Threshold Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

Table 6.44 CSx_LD_TH Bit Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

Table 6.45 Slider Velocity Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Table 6.46 MAX_INT Bit Decode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Table 6.47 SLIDE_TIME Bit Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Table 6.48 RPT_SCALE Bit Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Table 6.49 Digital Recalibration Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Table 6.50 Configuration 2 Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Table 6.51 Grouped Sensor Channel Enable Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Table 6.52 Proximity Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Table 6.53 PROX_AVG Bit Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Table 6.54 Sampling Channel Select Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

Table 6.55 Sampling Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Table 6.56 OVERSAMP_RATE Bit Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Table 6.57 Sensor Base Count Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Table 6.58 LED Status Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

Table 6.59 Feedback Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Table 6.60 FDBK_DUR Bit Decode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

Table 6.61 Feedback Channel Configuration Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

Table 6.62 Feedback One-Shot Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

Table 6.63 LED / GPIO Direction Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

Table 6.64 LED / GPIO Output Type Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

Table 6.65 GPIO Input Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

Table 6.66 LED Output Control Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

Table 6.67 LED Polarity Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

Table 6.68 LED Polarity Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

Table 6.69 Linked LED Transition Control Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

Table 6.70 LED Mirror Control Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

Table 6.71 Sensor LED Linking Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

Table 6.72 LED Behavior Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

Table 6.73 LEDx_CTL Bit Decode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

Table 6.74 LED Pulse 1 Period Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

Table 6.75 LED Pulse / Breathe Period Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

Table 6.76 LED Pulse 2 Period Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

Table 6.77 LED Breathe Period Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

Table 6.78 LED Configuration Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

Table 6.79 PULSE_CNT Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

Table 6.80 LED Configuration Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

Table 6.81 LED11_STEPS Bit Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

Table 6.82 LED11_CLK Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

Table 6.83 LED Period and Breathe Duty Cycle Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

Table 6.84 LED Duty Cycle Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

Table 6.85 LED Direct Ramp Rates Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

Table 6.86 Rise / Fall Rate Cycle Decode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

Table 6.87 LED Off Delay Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

Table 6.88 Breathe Off Delay Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98

Table 6.89 Direct Off Delay Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98

Table 6.90 Sensor Calibration Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99

Table 6.91 Product ID Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

Table 6.92 Revision Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

Table 8.1 Customer Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1214 9 Revision 1.0 (08-30-10)

DATASHEET

Chapter 1 Pin Description

Figure 1.1 CAP1214 Pin Diagram (32-Pin QFN)

Table 1.1 Pin Description for CAP1214

PIN # PIN NAME PIN FUNCTION

TYPE

UNUSED

CONNECTION

1 CS8 Capacitive Touch Sensor 8 AIO Connect to Ground

2 CS9 Capacitive Touch Sensor 9 AIO Connect to Ground

3 CS10 Capacitive Touch Sensor 10 AIO Connect to Ground

4 CS11 Capacitive Touch Sensor 11 AIO Connect to Ground

5 CS12 Capacitive Touch Sensor 12 AIO Connect to Ground

6 CS13 Capacitive Touch Sensor 13 AIO Connect to Ground

7 CS14 Capacitive Touch Sensor 14 AIO Connect to Ground

CS8

LED1 / GPIO1

CS9

CS10

CS11

LED2 / GPIO2

LED3 / GPIO3

CS12

CS13

CS14

LED4 / GPIO4

LED5 / GPIO5

LED6 / GPIO6

CS6

CS5

CS4

CS3

CS2

LED7 / GPIO7

LED10

LED9

LED8 / GPIO8

SMCLK

ALERT

SMDATA

CS7

VDD

LED11

GND

RESET

N/C*

FEEDBACK

CS1

* Connect to ground.

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.0 (08-30-10) 10 SMSC CAP1214

DATASHEET

8 VDD Positive Power supply Power n/a

9LED1 /

GPIO1

LED1 - Open drain LED driver OD (5V) Connect to Ground

GPI1 - GPIO 1 input (default) DI (5V) Connect to Ground

GPO1 - GPIO 1 push-pull output DO Leave open

10 LED2 /

GPIO 2

LED2 - Open drain LED driver OD (5V) Connect to Ground

GPI2 - GPIO 2 input (default) DI (5V) Connect to Ground

GPO2 - GPIO 2 push-pull output DO Leave open

11 LED3 /

GPIO3

LED3 - Open drain LED driver OD (5V) Connect to Ground

GPI3 - GPIO 3 input (default) DI (5V) Connect to Ground

GPO3 - GPIO 3 push-pull output DO Leave open

12 LED4 /

GPIO4

LED4 - Open drain LED driver OD (5V) Connect to Ground

GPI4 - GPIO 4 input (default) DI (5V) Connect to Ground

GPO4 - GPIO 4 push-pull output DO Leave open

13 LED5 /

GPIO5

LED5 - Open drain LED driver OD (5V) Connect to Ground

GPI5 - GPIO 5 input (default) DI (5V) Connect to Ground

GPO5 - GPIO 5 push-pull output DO Leave open

14 LED6 /

GPIO6

LED6 - Open drain LED driver OD (5V) Connect to Ground

GPI6 - GPIO 6 input (default) DI (5V) Connect to Ground

GPO6 - GPIO 6 push-pull output DO Leave open

15 LED7 /

GPIO7

LED7 - Open drain LED driver OD (5V) Connect to Ground

GPI7 - GPIO 7 input (default) DI (5V) Connect to Ground

GPO7 - GPIO 7 push-pull output DO Leave open

16 LED8 /

GPIO8

LED8 - Open drain LED driver OD (5V) Connect to Ground

GPI8 - GPIO 8 input (default) DI (5V) Connect to Ground

GPO8 - GPIO 8 push-pull output DO Leave open

17 LED9 LED9 - Open drain LED driver OD (5V) Connect to Ground

18 LED10 LED10 - Open drain LED driver OD (5V) Connect to Ground

19 LED11 LED11 - Open drain LED driver OD (5V) Connect to Ground

20 ALERT Active High Interrupt / Wake Up Input DIO Pull-down resistor

21 SMDATA Bi-directional SMBus data - requires pull-up

resistor

DIOD

(5V) n/a

22 SMCLK SMBus clock input - requires pull-up resistor DI (5V) n/a

Table 1.1 Pin Description for CAP1214 (continued)

PIN # PIN NAME PIN FUNCTION

TYPE

UNUSED

CONNECTION

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1214 11 Revision 1.0 (08-30-10)

DATASHEET

The pin types are described in Table 1.2, "Pin Types". All pins labeled with (5V) are 5V tolerant.

Note: For all 5V tolerant pins that require a pull-up resistor, the voltage difference between VDD and

the pull-up voltage must never exceed 3.6V.

23 RESET Soft reset for system - resets all registers to

default values DI (5V) Connect to Ground

24 FEEDBACK Sensor press feedback output. DO Leave open

25 N/C Not Connected N/A Connect to Ground

26 CS1 Capacitive Touch Sensor 1 AIO Connect to Ground

27 CS2 Capacitive Touch Sensor 2 AIO Connect to Ground

28 CS3 Capacitive Touch Sensor 3 AIO Connect to Ground

29 CS4 Capacitive Touch Sensor 4 AIO Connect to Ground

30 CS5 Capacitive Touch Sensor 5 AIO Connect to Ground

31 CS6 Capacitive Touch Sensor 6 AIO Connect to Ground

32 CS7 Capacitive Touch Sensor 7 AIO Connect to Ground

Bottom

Plate GND Power Ground Power n/a

Table 1.2 Pin Types

PIN TYPE DESCRIPTION

AIO Analog Input / Output - this pin is used as an I/O for analog signals.

DI Digital Input - this pin is used as a digital input. This pin is 5V tolerant.

DIOD Digital Input / Open Drain Output - this pin is used as an digital I/O. When it is used as an

output, It is open drain and requires a pull-up resistor. This pin is 5V tolerant.

DO Push-pull Digital Output - this pin is used as a digital output and can sink and source current.

OD Open Drain Digital Output - this pin is used as a digital output. It is open drain and requires a

pull-up resistor. This pin is 5V tolerant.

Power This pin is used to supply power or ground to the device.

Table 1.1 Pin Description for CAP1214 (continued)

PIN # PIN NAME PIN FUNCTION

TYPE

UNUSED

CONNECTION

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.0 (08-30-10) 12 SMSC CAP1214

DATASHEET

Chapter 2 Delta from CAP1114 to CAP1214

2.1 Summary

1. Updated Product ID to 5Ah.

2. Changed pin 24 from N/C to FEEDBACK.

3. Increased RESET Pin release to fully active operation from 400ms typical and 500ms max to

675ms typical and 775ms max (see Table 3.2, "Electrical Specifications").

4. Reduced Time to First Conversion from 400ms typical and 500ms max to 100ms typical and 200ms

max (see Table 3.2, "Electrical Specifications").

5. Added Time to First Valid Detection 675ms typical and 775ms max (see Table 3.2, "Electrical

Specifications").

6. Added Power Supply Rejection ±310 counts / V typical (see Table 3.2, "Electrical Specifications").

7. Added bits 5 and 4 to the Queue Control register (1Eh - see Section 6.12, "Queue Control

negative delta counts counter are cleared when the noise status bit is set.

8. Added the following registers to implement the new Feedback feature, which enables the CAP1214

to activate an external transducer to send end user feedback in the form of sound or vibration when

a touch is detected: Feedback Configuration (62h - see Section 6.40, "Feedback Configuration

Configuration Registers"), and Feedback One-Shot (65h - see Section 6.42, "Feedback One-Shot

9. Added LED11_CFG control as bit 5 of the Configuration 2 register (40h - see Section 6.33,

"Configuration 2 Register"). This controls whether frequency of the LED11 driver is set at ~2000Hz

or is configurable.

10. Added the LED11 Configuration register (8Ah) to determine base frequency and step settings for

LED11.

11. Corrected anomaly where rise rate overrode any non-zero fall rate (Section 6.58, "LED Direct

Ramp Rates Register").

12. Corrected anomaly where Pulse 1 behavior failed on alternate presses when a sensor was linked

to an LED and the Pulse 1 start trigger was set to “release”.

13. Corrected anomaly where the delta counts were not cleared when the RF Detector circuit detected

excessive RF signal on a capacitive sensor input.

14. Pulse 2 behavior modified. The number of pulses after release is the programmed number, not the

programmed number minus one (see Section 6.53, "LED Pulse 2 Period Register").

15. Breathe behavior modified. A breathe off delay control was added to the LED Off Delay Register

(see Section 6.59, "LED Off Delay Register") so the LED can be configured to remain inactive

between breathes.

16. When the device enters the Deep Sleep state, the Slider Position / Volumetric Data Register (06h)

is not cleared, if the register is set to represent volumetric data. If set to represent position

information, the register is cleared.

17. Updated circuitry to improve power supply rejection.

18. Renamed BLK_DIG_NOISE bit to DIS_DIG_NOISE, and renamed BLK_ANA_NOISE bit to

DIS_ANA_NOISE (see Section 6.14, "Configuration Register"). Renamed BLK_RF_NOISE bit to

DIS_RF_NOISE (see Section 6.33, "Configuration 2 Register").

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1214 13 Revision 1.0 (08-30-10)

DATASHEET

2.2 Register Delta

Table 2.1 Register Delta

ADDRESS REGISTER DELTA DELTA DEFAULT

1Dh

Added controls Added bit 5 NO_CLR_INTD and bit 4

NO_CLR_NEG to Queue Control

03h

40h Added control Added bit 5 LED11_CFG to Configuration

2 Register 00h

62h New Feedback Configuration 00h

63h New Feedback Channel Configuration 1 00h

64h New Feedback Channel Configuration 2 00h

65h New Feedback One-Shot 00h

8Ah New LED11 Configuration 00h

95h Added control Added bits 6-4 BR_OFF_DLY[2:0] to LED

Off Delay Register 00h

FDh Changed Product ID changed. 5Ah

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.0 (08-30-10) 14 SMSC CAP1214

DATASHEET

Chapter 3 Electrical Specifications

Note: Stresses above those listed could cause permanent damage to the device. This is a stress

rating only and functional operation of the device at any other condition above those indicated

in the operation sections of this specification is not implied.

Note 3.1 For the 5V tolerant pins that have a pull-up resistor, the pull-up voltage must not exceed

3.6V when the device is unpowered.

Note 3.2 The Package Power Dissipation specification assumes a thermal via design with the

thermal landing be soldered to the PCB ground plane with 0.3mm (12mil) diameter vias in

a 4x4 matrix at 0.9mm (35.4mil) pitch.

Note 3.3 Junction to Ambient (θJA) is dependent on the design of the thermal vias. Without thermal

vias and a thermal landing, the θJA is approximately 60°C/W including localized PCB

temperature increase.

Table 3.1 Absolute Maximum Ratings

Voltage on VDD pin -0.3 to 4 V

Voltage on 5V tolerant pins (V5VT_PIN) -0.3 to 5.5 V

Voltage on 5V tolerant pins (|V5VT_PIN - VDD|) (see Note 3.1)0 to 3.6 V

Voltage on any other pin to GND -0.3 to VDD + 0.3 V

Package Power Dissipation up to TA = 85°C (see Note 3.2)1 W

Junction to Ambient (θJA) (see Note 3.3)48 °C/W

Operating Ambient Temperature Range -40 to 125 °C

Storage Temperature Range -55 to 150 °C

ESD Rating, All Pins, HBM 8000 V

Table 3.2 Electrical Specifications

VDD = 3V to 3.6V, TA = 0°C to 85°C, all Typical values at TA = 27°C unless otherwise noted.

CHARACTERISTIC SYMBOL MIN TYP MAX UNIT CONDITIONS

DC Power

Supply Voltage VDD 3.0 3.3 3.6 V

Supply Current

IDD 0.55 1 mA

Average current

Capacitive Sensing Active,

LEDs enabled

ISLEEP 250 400 uA

Sleep state active, 1 sensor

monitored; LED11 inactive

TA < 85°C

IDSLEEP 4.5 15 uA Deep Sleep, LED 11 inactive

TA < 40°C

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1214 15 Revision 1.0 (08-30-10)

DATASHEET

Time to

Communications tCOMM 15 20 ms Time from power applied to

communications active

Time to First

Conversion tCONV 100 200 ms Time from power applied to first

sensor sampled

Time to First Valid

Detection tCONV 675 775 ms Time from power applied to first

valid data

Capacitive Touch Sensor

Base Capacitance CBASE 5 50 pF Pad untouched

Detectable

Capacitive Shift ΔCTOUCH 0.1 2 pF Pad touched

Sample Time tTOUCH 2.5 ms

Update Time ΔtTOUCH 35 ms

Recalibration Interval ΔtCAL 8s

Automatic Recalibration active,

no touch active, default settings

Power Supply

Rejection PSR ±310 counts

/ V

LED / GPIO Drivers (LED / GPIO 1 - 8)

Duty Cycle DUTYLED 0 100 % Programmable

Drive Frequency fLED 2kHz

Sinking Current ISINK 24 mA VOL = 0.4

Sourcing Current ISOURCE 24 mA VOH = VDD - 0.4

Input High Voltage VIH 2.0 V LED / GPIO configured as input

Input Low Voltage VIL 0.8 V LED / GPIO configured as input

LED Drivers (LED 9 - LED 10)

Duty Cycle DUTYLED 0 100 % Programmable

Drive Frequency fLED 2kHz

Sinking Current ISINK 24 mA

Output Low Voltage VOL 0.4 V ISINK = 24mA

LED11 Driver

Duty Cycle DUTYLED 0 100 % Programmable

Drive Frequency fLED 2 kHz Programmable

Sinking Current ISINK 48 mA

Output Low Voltage VOL 0.4 V ISINK = 48mA

Table 3.2 Electrical Specifications (continued)

VDD = 3V to 3.6V, TA = 0°C to 85°C, all Typical values at TA = 27°C unless otherwise noted.

CHARACTERISTIC SYMBOL MIN TYP MAX UNIT CONDITIONS

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.0 (08-30-10) 16 SMSC CAP1214

DATASHEET

I/O Pins - SMDATA, SMCLK, and ALERT Pins

Output Low Voltage VOL 0.4 V ISINK_IO = 8mA

Output High Voltage VOH

VDD -

0.4 V

ALERT pin active high and

asserted

ISOURCE_IO = 8mA

Input High Voltage VIH 2.0 V

Input Low Voltage VIL 0.8 V

Leakage Current ILEAK ±5 uA

powered or unpowered

TA < 85°C

pull-up voltage < VDD

FEEDBACK Pin

Output Low Voltage VOL 0.4 V ISINK_IO = 24mA

Output High Voltage VOH

VDD -

0.4 VI

SOURCE_IO = 24mA

RESET Pin

Input High Voltage VIH 2.0 V

Input Low Voltage VIL 0.8 V

RESET Filter Time tRST_FILT 10 ms

RESET Pin release

to fully active

operation

tRST_ON 675 775 ms

SMBus Timing

Input Capacitance CIN 5pF

Clock Frequency fSMB 10 400 kHz

Spike Suppression tSP 50 ns

Bus free time Start to

Stop tBUF 1.3 us

Hold Time: Start tHD:STA 0.6 us

Setup Time: Start tSU:STA 0.6 us

Setup Time: Stop tSU:STO 0.6 us

Data Hold Time tHD:DAT 0us

Data Setup Time tSU:DAT 0.6 us

Clock Low Period tLOW 1.3 us

Clock High Period tHIGH 0.6 us

Clock/Data Fall time tFALL 300 ns Min = 20+0.1CLOAD ns

Table 3.2 Electrical Specifications (continued)

VDD = 3V to 3.6V, TA = 0°C to 85°C, all Typical values at TA = 27°C unless otherwise noted.

CHARACTERISTIC SYMBOL MIN TYP MAX UNIT CONDITIONS

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1214 17 Revision 1.0 (08-30-10)

DATASHEET

Clock/Data Rise time tRISE 300 ns Min = 20+0.1CLOAD ns

Capacitive Load CLOAD 400 pF per bus line

Table 3.2 Electrical Specifications (continued)

VDD = 3V to 3.6V, TA = 0°C to 85°C, all Typical values at TA = 27°C unless otherwise noted.

CHARACTERISTIC SYMBOL MIN TYP MAX UNIT CONDITIONS

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.0 (08-30-10) 18 SMSC CAP1214

DATASHEET

Chapter 4 Communications

The CAP1214 communicates via the SMBus or I2C communications protocols.

APPLICATION NOTE: Upon power up, the CAP1214 will not respond to any SMBus communications until “time to

communications” has elapsed (see Table 3.2, "Electrical Specifications"). After this time, full

functionality is available.

4.1 System Management Bus Protocol

The CAP1214 communicates with a host controller, such as an SMSC SIO, through the SMBus. The

SMBus is a two-wire serial communication protocol between a computer host and its peripheral

devices. A detailed timing diagram is shown in Figure 4.1. Stretching of the SMCLK signal is supported;

however, the CAP1214 will not stretch the clock signal.

4.1.1 SMBus Start Bit

The SMBus Start bit is defined as a transition of the SMBus Data line from a logic ‘1’ state to a logic

‘0’ state while the SMBus Clock line is in a logic ‘1’ state.

4.1.2 SMBus Address and RD / WR Bit

The SMBus Address Byte consists of the 7-bit client address followed by the RD / WR indicator bit. If

this RD / WR bit is a logic ‘0’, the SMBus Host is writing data to the client device. If this RD / WR bit

is a logic ‘1’, the SMBus Host is reading data from the client device.

The CAP1214 responds to the slave address 0101_000xb. Multiple addressing options are available.

For more information contact SMSC.

4.1.3 SMBus Data Bytes

All SMBus Data bytes are sent most significant bit first and composed of 8-bits of information.

Figure 4.1 SMBus Timing Diagram

SMDATA

SMCLK

TBUF

PS S - Start Condition P - Stop Condition PS

THIGH

TLOW THD:STA TSU:STO

THD:STA THD:DAT

TSU:DAT TSU:STA

TFALL

TRISE

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1214 19 Revision 1.0 (08-30-10)

DATASHEET

4.1.4 SMBus ACK and NACK Bits

The SMBus client will acknowledge all data bytes that it receives. This is done by the client device

pulling the SMBus Data line low after the 8th bit of each byte that is transmitted. This applies to both

the Write Byte and Block Write protocols.

The Host will NACK (not acknowledge) the last data byte to be received from the client by holding the

SMBus data line high after the 8th data bit has been sent. For the Block Read protocol, the Host will

ACK each data byte that it receives except the last data byte.

4.1.5 SMBus Stop Bit

The SMBus Stop bit is defined as a transition of the SMBus Data line from a logic ‘0’ state to a logic

‘1’ state while the SMBus clock line is in a logic ‘1’ state. When the CAP1214 detects an SMBus Stop

bit, and it has been communicating with the SMBus protocol, it will reset its client interface and prepare

to receive further communications.

4.1.6 SMBus Time-out

The CAP1214 includes an SMBus time-out feature. Following a 30ms period of inactivity on the SMBus

where the SMCLK pin is held low, the device will time-out and reset the SMBus interface.

The time-out function defaults to disabled. It can be enabled by setting the TIMEOUT bit in the

Configuration register (see Section 6.14).

4.1.7 SMBus and I2C Compliance

The major differences between SMBus and I2C devices are highlighted here. For complete compliance

information, refer to the SMBus 2.0 specification.

1. Minimum frequency for SMBus communications is 10kHz. There is no minimum frequency for I2C.

2. For SMBus communications, the client protocol will reset if the clock is held low longer than 30ms.

3. For SMBus communications, the client protocol will reset if both the clock and the data line are

high for longer than 400us (idle condition).

4. I2C devices do not support the Alert Response Address functionality (which is optional for SMBus).

5. I2C devices support block read and write differently. I2C protocol allows for unlimited number of

bytes to be sent in either direction. The SMBus protocol requires that an additional data byte

indicating number of bytes to read / write is transmitted.

Note: The CAP1214 supports the I2C block read and write only.

4.2 SMBus Protocols

The CAP1214 is SMBus 2.0 compatible and supports Send Byte, Read Byte, Block Read, Receive

Byte as valid protocols as shown below. The CAP1214 also supports the I2C block read and block

write protocols.

All of the below protocols use the convention in Table 4.1.

Table 4.1 Protocol Format

DATA SENT

TO DEVICE

DATA SENT TO

THE HOST

Data sent Data sent

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4.2.1 SMBus Write Byte

The Write Byte is used to write one byte of data to a specific register as shown in Table 4.2.

4.2.2 Block Write

The Block Write is used to write multiple data bytes to a group of contiguous registers as shown in

Table 4.3. It is an extension of the Write Byte Protocol.

APPLICATION NOTE: When using the Block Write protocol, the internal address pointer will be automatically

incremented after every data byte is received. It will wrap from FFh to 00h.

4.2.3 SMBus Read Byte

The Read Byte protocol is used to read one byte of data from the registers as shown in Table 4.4.

4.2.4 Block Read

The Block Read is used to read multiple data bytes from a group of contiguous registers as shown in

Table 4.5. It is an extension of the Read Byte Protocol.

APPLICATION NOTE: When using the Block Read protocol, the internal address pointer will be automatically

incremented after every data byte is received. It will wrap from FFh to 00h.

Table 4.2 Write Byte Protocol

START

CLIENT

ADDRESS WR ACK

ADDRESS ACK

DATA ACK STOP

1 ->0 0101_000 0 0 XXh 0 XXh 0 0 -> 1

Table 4.3 Block Write Protocol

START

CLIENT

ADDRESS WR ACK

ADDRESS ACK

DATA ACK

1 ->0 0101_000 0 0 XXh 0 XXh 0

DATA ACK

DATA ACK . . .

DATA ACK STOP

XXh 0 XXh 0 . . . XXh 0 0 -> 1

Table 4.4 Read Byte Protocol

START CLIENT

ADDRESS

WR ACK REGISTER

ADDRESS

ACK START CLIENT

ADDRESS

RD ACK REGISTER

DATA

NACK STOP

1->0 0101_000 0 0 XXh 0 1 ->0 0101_000 1 0 XXh 1 0 -> 1

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4.2.5 SMBus Send Byte

The Send Byte protocol is used to set the internal address register pointer to the correct address

location. No data is transferred during the Send Byte protocol as shown in Tab l e 4 . 6 .

4.2.6 SMBus Receive Byte

The Receive Byte protocol is used to read data from a register when the internal register address

pointer is known to be at the right location (e.g. set via Send Byte). This is used for consecutive reads

of the same register as shown in Table 4.7.

Table 4.5 Block Read Protocol

START CLIENT

ADDRESS

WR ACK REGISTER

ADDRESS

ACK START CLIENT

ADDRESS

RD ACK REGISTER

DATA

1->0 0101_000 0 0 XXh 0 1 ->0 0101_000 1 0 XXh

ACK REGISTER

DATA

ACK REGISTER

DATA

ACK REGISTER

DATA

ACK . . . REGISTER

DATA

NACK STOP

0 XXh 0 XXh 0 XXh 0 . . . XXh 1 0 -> 1

Table 4.6 Send Byte Protocol

START

CLIENT

ADDRESS WR ACK

ADDRESS ACK STOP

1 -> 0 0101_000 0 0 XXh 0 0 -> 1

Table 4.7 Receive Byte Protocol

START

CLIENT

ADDRESS RD ACK REGISTER DATA NACK STOP

1 -> 0 0101_000 1 0 XXh 1 0 -> 1

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Chapter 5 Product Description

The CAP1214 is a multiple channel Capacitive Touch sensor and LED Driver.

The CAP1214 has up to 14 individual Capacitive Touch sensor inputs with programmable sensitivity

for use in touch button and slider switch applications. Each sensor input includes automatic

recalibration.

The CAP1214 also has eleven (11) open drain LED drivers that offer full-on / off, variable rate

breathing, and dimness controls. Eight (8) of these LEDs can double as GPIOs and support open-drain

or push-pull operation. Additionally, LEDs 1-7 may be optionally linked to Buttons 1-7 so that when a

touch is detected, the LED is actuated.

The device communicates with a host controller using SMBus. The host controller may poll the device

for updated information at any time or it may configure the device to flag an interrupt whenever a press

is detected on any sensor.

Each sensor input is polled by the device approximately every 35 ms. The host may also initiate a

recalibration routine for one or more sensor inputs or set up times and conditions so that the device

automatically invokes the re-calibration routine.

The CAP1214 contains multiple power states including several low power operating states. In addition,

it contains a user driven RESET pin.

A typical system diagram is shown in Figure 5.1.

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5.1 Power States

The CAP1214 has four operating states depending on the status of the SLEEP, DEACT, and DSLEEP

bits (see Section 6.1). They are described below and summarized in Table 5.1. When the device

transitions between power states, previously detected touches (for deactivated channels) are cleared

and the status bits reset.

Figure 5.1 System Diagram for CAP1214

CAP1214

LED11

Slider

LED10

CS14

CS13

CS12

CS11

CS10

CS9

CS8

LED9

SMDATA

SMCLK

Embedded Controller

VDD

LED8

ALERT

Dual

Color

LED

3.3V

CS1

LED1

Touch

Button

3.3V

3.3V 3.3V

CS2

LED2

Touch

Button

3.3V

CS3

LED3

Touch

Button

3.3V

CS5

LED5

Touch

Button

3.3V

CS4

LED4

Touch

Button

3.3V

CS6

LED6

Touch

Button

3.3V

CS7

LED7

Touch

Button

3.3V

RESET

3.3V 3.3V

FEEDBACK Transducer

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1. Fully Active - The device is monitoring all active Capacitive Sensor channels and driving all LED

channels as defined.

2. Sleep - The device is monitoring a limited number of Capacitive Sensor channels (default 0).

Interrupts will still be generated based on the active channels. The device will still respond to

SMBus commands normally and can be returned to the Fully Active state by clearing the SLEEP

bit. The LED11 channel is controlled via the PWR_LED control (see Section 6.1). All other LEDs

will not be affected.

3. Deep Sleep - The device is not monitoring any Capacitive Sensor channels. The LED11 channel

is controlled via the PWR_LED control (see Section 6.1). All other LEDs will be driven to their

programmed non-actuated state and no PWM operations will be done.

When the device enters the Deep Sleep state, it will release control to the ALERT pin and will

change the direction of the ALERT pin (i.e. the device will monitor the ALERT pin instead of driving

it).

APPLICATION NOTE: When the device enters the Deep Sleep state, the Slider Position / Volumetric Data Register

(06h) is cleared, if the register is set to represent position data.

The device has two methods to exit the Deep Sleep state. They are:

a. The ALERT pin is driven to its active state.

b. Any SMBus communications are directed at the device.

When the device leaves the Deep Sleep state, it automatically returns to its previously defined state

and clears the DSLEEP bit.

4. Inactive - The device is not monitoring any Capacitive Sensor channels. The device will still

respond to SMBus commands normally and can be returned to Fully Active state by clearing the

DEACT bit. All LEDs will have PWM controls suspended so they should be disabled prior to

entering this state. If these LEDs are not disabled, the system will show excess current draw from

these LEDs.

The priority of power control signals is:

1. DSLEEP - when set, will override DEACT and disable all LEDs except LED11.

2. DEACT - when set, will override the SLEEP controls. It will disable sensor measurement and all

LEDs.

3. SLEEP - when set, will enable Sleep state.

Table 5.1 Power States

POWER STATE INACTIVE SLEEP DSLEEP

Fully Active 0 0 0

Deep Sleep waking to Fully Active 0 0 1

Sleep 010

Deep Sleep waking to Sleep 0 1 1

Inactive 100

Deep Sleep waking to Inactive 1 0 1

Inactive 110

Deep Sleep waking to Inactive 1 1 1

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5.2 RESET Pin

The RESET pin is an active high reset that is driven from an external source. The pin contains an

internal delay timer (tRST_FILT) that will block errant glitches on the RESET pin. The RESET pin must

be driven high or low longer than this time before the CAP1214 will react to the pin state.

While the RESET pin is held high, all the internal blocks will be held in reset including the SMBus. All

configuration settings will be reset to default states and all readings will be cleared. Furthermore, the

device will be held in Deep Sleep that can only be removed by driving the RESET pin low.

Once the RESET pin is pulled low, the CAP1214 will begin operation as if a power-on-reset had

occurred. When this happens, the RESET bit will be set and an interrupt will be generated.

5.3 LED Drivers

The CAP1214 contains eleven (11) LED Drivers. Each LED Driver is controlled independently of the

others. LED drivers 1 - 8 can be configured to operate with either push-pull or open-drain drive (see

Section 6.44, "LED / GPIO Output Type Register") and may also be configured to operate as GPIOs

(see Section 6.43, "LED / GPIO Direction Register"). LED drivers 9 - 11 will only operate as open-drain

drivers.

LEDs 1 - 7 and 9 and 10 may be linked to the corresponding Capacitive Touch Sensor input (see

Section 6.50, "Sensor LED Linking Register") so they can be actuated by a touch. When not linked to

sensor inputs, LEDs can be actuated by the host (see Section 6.46, "LED Output Control Registers").

When actuated, the LED drivers operate using one of the following behaviors (see Section 6.51, "LED

Behavior Registers"):

1. Direct - The LED is configured to be on or off when the corresponding input stimulus is on or off

(or inverted). The brightness of the LED can be programmed from full off to full on (default).

Additionally, the LED contains controls to individually configure ramping on, off, and turn-off delay.

2. Pulse 1 - The LED is configured to “Pulse” (transition ON-OFF-ON) a programmable number of

times with programmable rate and min / max brightness. The LED can be configured to be actuated

upon a touch detection (or when hosts sets drive bit) or release detection (or when host clears

drive bit) (see Section 6.52, "LED Pulse 1 Period Register").

3. Pulse 2 - The LED is configured to “Pulse” while actuated and then “Pulse” a programmable

number of times with programmable rate and min / max brightness when the sensor is released.

4. Breathe - The LED is configured to transition ON-OFF-ON (i.e. to “Breathe”) continuously (or with

a programmed off delay) with a programmable rate and min / max brightness.

When an LED is not linked to a sensor and is actuated by the host, there’s an option to assert the

ALERT pin when the LED has completed its behavior (see Section 6.55, "LED Configuration Register").

LED11 operates differently than the other LED outputs in several ways. It is configured to drive up to

two external LED channels simultaneously. It is not automatically disabled during the Sleep or Deep

Sleep states of operation (see Section 6.1, "Main Status Control Register"). It allows for different

behaviors when the device is in Fully Active state versus when the device is in Sleep or Deep Sleep

state. It can drive at a different PWM frequency.

5.3.1 Linking LEDs to Capacitive Touch Sensors

LEDs 1 - 7 can be optionally linked to Capacitive Touch Sensors 1-7 so that when the sensor detects

a button press, the corresponding LED will be actuated at one of the programmed responses.

LEDs 9 and 10 may be optionally linked to the Grouped Sensors to indicate a slide / tap / press and

hold in the “Up” or “Down” directions.

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5.4 Capacitive Touch Sensing

The CAP1214 contains 14 independent Capacitive Touch Sensor inputs. Each sensor input detects a

change of capacitance due to a touch. Additionally, each sensor can be configured to be automatically

and routinely re-calibrated.

5.4.1 Multiple Button Presses

If multiple sensor buttons (with a programmable threshold - see Section 6.23) are simultaneously

detected, only the first N buttons that are detected are flagged. All other buttons are ignored.

Furthermore, the device remembers which buttons were legitimate so new touches are not detected

so long as N buttons are pressed.

Likewise, if too many (based on the programmed threshold - see Section 6.23) grouped sensor

presses are detected, the device will block all press detections on the grouped buttons and cancel any

current presses as if the sensor had been released.

5.4.2 Lid Closure

To detect lid closure or other similar events, lid closure sensor thresholds can be set. A Lid Closure

Event can be flagged based on either a minimum number of sensors or on specific sensors

simultaneously exceeding the lid closure threshold. An interrupt can also be generated. During a Lid

Closure Event, all touches are blocked.

5.4.3 Grouped Sensors (CS8 - CS14)

Capacitive Touch Sensors 8 through 14 may be grouped as a single entity (which is the default state).

Each sensor is sampled independently; however, for purposes of activation, recalibration, and repeat

rates, all of them are treated as one group. The Group also has different controls and allows for

different behavior such as sliding, tapping, or press and hold.

The grouped sensors may be ungrouped as described in Section 5.6.

5.4.4 Sensing Cycle

Each Capacitive Touch Sensor has controls to be activated and included in the sensing cycle. When

the device is active, it automatically initiates a sensing cycle and repeats the cycle every time it

finishes. The cycle polls through each active Sensor starting with CS1 and extending through CS14.

As each Capacitive Touch Sensor is polled, its measurement is compared against a baseline “Not

Touched” measurement. If the delta measurement is large enough, a touch is detected and an interrupt

generated.

5.4.5 Proximity Detection

Sensor CS1 can be configured to detect changes in capacitance due to proximity of a touch. This

circuitry detects the change of capacitance that is generated as an object approaches, but does not

physically touch, the CS1 sensor. When proximity detection is enabled, the signal is boosted by 8x to

detect very small capacitance changes. Separate controls determine averaging and sensitivity for

proximity (see Section 6.35, "Proximity Control Register").

5.4.6 Recalibrating Sensors

Each sensor is regularly recalibrated at a programmable rate. By default, the recalibration routine

stores the average 256 previous measurements and periodically updates the base “Not Touched”

setting for the Capacitive Touch Sensor input. This routine is disabled automatically if a touch is

detected so the touch does not factor into the base “Not Touched” setting.

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5.4.7 Low Frequency Noise Detection

Each sensor has an EMI noise detector that will sense if low frequency noise is injected onto the input

with sufficient power to corrupt the readings. If this occurs, the device will reject the corrupted sample

and set the corresponding bit in the Noise Status registers to a logic ‘1’.

5.4.8 RF Noise Detection

Each sensor also contains an integrated RF noise detector. This block will detect injected RF noise on

the CS pin. The detector threshold is dependent upon the noise frequency. If RF noise is detected on

a CS line, the applicable Noise Status bit is set and that sample is removed and not compared against

the threshold.

5.5 Grouped Sensor Behavior

The CAP1214 Grouped sensors (CS8 - CS14) can be configured to function as a single entity that

operates differently than the individual button sensors (for ungrouped behavior see Section 5.6). When

configured as a group these sensors function as a slider and offer three different interface functions

associated with it. These functions are Tap, Press and Hold, or a Slide.

For purposes of a Tap or Press and Hold event, the “DOWN” side of the Grouped sensors are defined

as CS8, CS9 and CS10. The “UP” side of the Grouped Sensors are defined as CS12, CS13, and

CS14. CS11 is neither “UP” nor “DOWN” and a tap or press and hold event on CS11 will not cause

either UP or DOWN status bits to be set.

For purposes of a slide, the “DOWN” direction is decreasing in CS channel number. Conversely, the

“UP” direction is increasing in CS number.

APPLICATION NOTE: The Grouped Sensors will cause either the UP or DOWN status bits to be set but not both

at the same time. In the case that a sensor on both the “UP” side of the slider and the

“DOWN” side of the slider are touched simultaneously, neither the UP nor DOWN status bits

will be set.

5.5.1 Tap

If a touch on any Grouped sensor is detected and held for less than or equal to the M_PRESS bit

settings (default 245ms), a group press is detected, the TAP bit is set, and an interrupt is generated.

Furthermore, the relative position on the slider is determined and the appropriate UP or DOWN status

bits are set and the appropriate LED is actuated.

No further action is taken. If a slide is subsequently detected, the TAP status bit is cleared.

5.5.2 Press and Hold

If a touch on any Grouped sensor is held for longer than the M_PRESS bit settings (default 245ms),

a Group Touch is detected and an interrupt is generated. Furthermore, the relative position on the

slider is determined and the appropriate UP or DOWN status bits are set, the PH bit is set, and the

appropriate LED is actuated.

So long as the Grouped sensor is held, it will flag an interrupt at the programmed repeat rate (as

determined by the RPT_RATE_PH bit settings) indefinitely. Once the touch has been removed, the

Group is returned to its normal operating condition.

The M_PRESS setting is important to distinguish between Tap, Press & Hold and Sliding. If M_PRESS

is set too low, a Press & Hold may be detected during a slow slide. This will cause user confusion as

the Slide direction and LED may change. Longer M_PRESS settings will ensure that the 3 Group

behaviors are reliably distinct and will add more delay prior to the Press & Hold repeat interrupt

generation.

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5.5.3 Slider

The Grouped sensors have the capability to detect a slide in either the “UP” or “DOWN” direction as

referenced by the sensor numbers that are used. For example, an “Up” direction slide would be

detected if CS8 detected a touch, followed by CS9, then by CS10, etc. Likewise, a “Down” direction

slide would be detected if CS10 detected a touch, followed by CS9, then by CS8, etc.

Slides in either direction are configured to flag an interrupt and to cause an LED to be actuated

(separate for each direction). The Slide is detected independently of a Press and Hold or a Tap

condition and only one condition may be present at any one time.

So long as a slide is maintained in either direction, it will flag an interrupt at the programmed repeat

rate (as determined by the RPT_RATE_SL bit settings). If the slide is removed or changes direction,

it will reset and return to normal operation.

5.5.4 Relative Position

The CAP1214 has the option to indicate the relative position of a touch on the Grouped sensors. This

value is stored either as a scaled number from 2 to 98 indicating where a tap, press and hold, or the

end of a slide was detected or as a 8-bit number that represents volumetric data. When configured to

store volumetric data, the user may write a base setting at any time that is modified based on Grouped

sensor behavior (see Section 6.4).

5.5.5 Slider Velocity

The repeat rate can be dynamically increased based on the speed of a slide. This permits slow sliding

motions to have precise, step-by-step volume control and faster motions to generate increasingly fast

volume changes.

Two techniques are employed to increase the number of interrupts generated based on speed. First,

the slide speed is measured and the repeat rate is increased to provide more interrupts for the same

distance traveled relative to a slower slide. Second, additional interrupts are generated immediately

after the slide ends to further increase the change in volume. The number of additional interrupts is

based on slide speed; both of these dynamic slider behaviors are controlled by the Slider Velocity

5.6 Ungrouped Sensor Behavior

The CAP1214 Grouped sensors have the option to be used as individual buttons. When the group is

broken (via the VOL_UP_DOWN bit - see Section 6.33), buttons CS8 and CS14 will adopt one type

of behavior while buttons CS9 - CS13 will adopt another. In all cases, a slide will not be detected.

5.6.1 CS9 - CS13 Ungrouped Behavior

These buttons will cause the corresponding status bit in the Button Status 2 register (see Section 6.2)

to be asserted when a touch is detected. This touch detection uses the button queue and button repeat

rate settings. They will use the slider maximum duration and multiple touch settings.

5.6.2 CS8 and CS14 Ungrouped Behavior

CS8 and CS14 will generate interrupts based on the duration of the touch detected, similar to a Tap

and Press and Hold events. Furthermore, these sensors will generate interrupts at the Grouped

Sensors repeat rate based on whether a Tap or Press and Hold event has been detected.

If a touch is detected on CS8, the DOWN status bit will be set in addition to either TAP or PH.

If a touch is detected on CS14, the UP status bit will be set in addition to either TAP or PH.

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Based on the multiple button touch settings (see Section 6.23), both CS8 and CS14 may detect a

touch simultaneously and both UP and DOWN status bits may be set.

5.7 FEEDBACK Pin

The FEEDBACK pin can drive an external device (such as a piezo transducer) to generate feedback

(sound or vibration) to the final application user. The FEEDBACK pin can be driven when a touch is

detected (see Section 6.41, "Feedback Channel Configuration Registers"), or it can be driven by the

host (see Section 6.42, "Feedback One-Shot Register"). Duration and frequency of the output are

programmable (see Section 6.40, "Feedback Configuration Register").

When activated, the FEEDBACK pin drives a 50% duty cycle signal at the programmed frequency for

the programmed duration.

5.8 ALERT Pin

The ALERT pin is an active high output that asserts when an interrupt event is detected. It is also used

to wake the device from Deep Sleep state.

Whenever an interrupt is generated, the INT bit (see Section 6.1) is set. The ALERT pin is cleared

when INT bit is cleared by the user. Additionally, if no press is detected, the status bits are cleared

when the INT bit is cleared.

5.8.1 Button Interrupt Behavior

For non-grouped buttons, an interrupt is generated when a touch is detected. If the repeat rate is

enabled (see Section 6.14), then, so long as the touch is held, another interrupt will be generated

based on the programmed repeat rate (see Figure 5.2) and upon release. If repeat rate is not enabled,

an interrupt is generated when a touch is detected and optionally, can be generated at release (see

Section 6.33 and Figure 5.3).

Figure 5.2 Button Interrupt Behavior - Repeat Rate Enabled

Touch Detected

ALERT Pin /

INT bit

Button Status

SMBus Write to

INT bit

Polling Cycle

(35ms)

Button Repeat Rate

(175ms)

Optional

Interrupt on

Release

Interrupt on

Touch

Button Repeat Rate

(175ms)

Button Repeat Rate

(175ms)

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5.8.2 Grouped Sensor Interrupt Behavior

For grouped sensors, an interrupt is generated upon initial detection of a tap, slide, or press and hold

event. Subsequent interrupts are generated as follows:

1. For a slide event, an interrupt is generated based on the programmed repeat rate as well as the

velocity of the slide operation. See Figure 5.6 and Figure 5.7. Additional interrupts are generated

after the slide has finished. These extra interrupts are generated every round robin cycle (~35ms)

and the number is determined by the speed of the slide.

2. For a tap event there are no further interrupts. See Figure 5.4.

3. For a press and hold event, interrupts are generated based on the programmed repeat rate. If the

repeat rate is disabled, no further interrupts are generated. See Figure 5.5.

Figure 5.3 Button Interrupt Behavior - No Repeat Rate Enabled

Figure 5.4 Tap Interrupt Behavior

Touch Detected

ALERT Pin /

INT bit

Button Status

SMBus Write to

INT bit

Polling Cycle

(35ms)

Interrupt on

Touch Optional

Interrupt on

Release

Touch Detected

ALERT Pin /

INT bit

Tap & UP / DOWN

Status

SMBus Write to

INT bit

Polling Cycle

(35ms)

M_PRESS

Setting (280ms)

Released before

M_PRESS

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Figure 5.5 Press and Hold Interrupt Behavior

Touch Detected

ALERT Pin /

INT bit

PH Status

SMBus Write to

INT bit

Polling Cycle

(35ms)

M_PRESS

Setting (280ms)

UP / DOWN Status

Repeat Rate

(RPT_RATE_PH - 175ms)

Held longer than

M_PRESS Setting

Repeat Rate

(RPT_RATE_PH - 175ms)

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Figure 5.6 Slide Interrupt Behavior - No Acceleration

Touch Detected -

CS11

ALERT Pin /

INT bit

SMBus Write to

INT bit

Polling Cycle

(35ms)

UP Status

Touch Detected -

CS12

Touch Detected –

CS13

Touch Detected –

CS14

DOWN Status

Touch Detected –

CS10

Touch Detected –

CS9

Touch Detected –

CS8

Repeat Rate

(175ms)

DOWN UP

Repeat Rate

(175ms)

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Figure 5.7 Slide Interrupt Behavior - Acceleration Example

Touch Detected -

CS11

ALERT Pin /

INT bit

SMBus Write to

INT bit

Polling Cycle

(35ms)

Touch Detected -

CS12

Touch Detected –

CS13

Touch Detected –

CS14

Touch Detected –

CS10

Touch Detected –

CS9

Touch Detected –

CS8

Maximum Slide (768ms)

Repeat Rate (base

= 140ms)

Minor Acceleration -

Repeat Rate reduced

70ms

Major Acceleration -

Repeat Rate reduced

35ms

Normal Slide – no change

in repeat rate

140ms 70ms

Slide Ended (525ms) = 0.68 x

Max – Generate 2 extra

interrupts at 35ms apart

35ms

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Chapter 6 Register Description

The registers shown in Ta b l e 6 . 1 are accessible through the SMBus. An entry of ‘-’ indicates that the

bit is not used and will always read ‘0’.

Table 6.1 Register Set in Hexadecimal Order

ADDRESS R/W REGISTER NAME FUNCTION

DEFAULT

VALUE PAGE

00h R/W Main Status Control Controls general power states 00h Page 41

03h R Button Status 1

Returns the state of the Cap

Sensor group and buttons 1 - 6

and slider controls

00h Page 42

04h R Button Status 2 Returns the state of buttons 7 - 14 00h Page 42

05h R Build Revision Stores the functional revision of

the device build 10h Page 43

06h R-C /

R/W

Slider Position /

Volumetric Data

Returns the relative position of a

press on the slider or volumetric

data

00h Page 44

08h R Vendor ID Stores a fixed value that identifies

SMSC 5Dh Page 45

09h R/W Volumetric Step

Controls the step used for

volumetric data increases for a

slide

01h Page 45

0Ah R Noise Status 1 Stores the noise flags for sensors

1 - 7 00h Page 46

0Bh R Noise Status 2 Stores the noise flags for sensors

8 - 14 00h Page 46

0Ch R Lid Closure Status 1 Stores lid closure status bits for

sensors 1 - 7 00h Page 46

0Dh R Lid Closure Status 2 Stores lid closure status bits for

sensors 8 - 14 00h Page 46

0Eh R-C GPIO Status Stores the status of LED1 / GPIO1

through LED8 / GPIO8 pins 00h Page 47

0Fh R-C Group Status Returns the state of the Grouped

sensors 00h Page 47

10h R Sensor 1 Delta

Count Stores the delta count for CS1 00h Page 48

11h R Sensor 2 Delta

Count Stores the delta count for CS2 00h Page 48

12h R Sensor 3 Delta

Count Stores the delta count for CS3 00h Page 48

13h R Sensor 4 Delta

Count Stores the delta count for CS4 00h Page 48

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1214 35 Revision 1.0 (08-30-10)

DATASHEET

14h R Sensor 5 Delta

Count Stores the delta count for CS5 00h Page 48

15h R Sensor 6 Delta

Count Stores the delta count for CS6 00h Page 48

16h R Sensor 7 Delta

Count Stores the delta count for CS7 00h Page 48

17h R Sensor 8 Delta

Count Stores the delta count for CS8 00h Page 48

18h R Sensor 9 Delta

Count Stores the delta count for CS9 00h Page 48

19h R Sensor 10 Delta

Count Stores the delta count for CS10 00h Page 48

1Ah R Sensor 11 Delta

Count Stores the delta count for CS11 00h Page 48

1Bh R Sensor 12 Delta

Count Stores the delta count for CS12 00h Page 48

1Ch R Sensor 13 Delta

Count Stores the delta count for CS13 00h Page 48

1Dh R Sensor 14 Delta

Count Stores the delta count for CS14 00h Page 48

1Eh R/W Queue Control Controls how samples and noise

flag effects on some data 03h Page 49

1Fh R/W Data Sensitivity

Controls the sensitivity of the

threshold and delta counts and

data scaling of the base counts

2Fh Page 50

20h R/W Configuration Controls some recalibration and

LED controls 29h Page 51

21h R/W Sensor Enable

Controls whether the Capacitive

Touch Sensor group and button

inputs 1 - 7 are sampled

FFh Page 52

22h R/W Button Configuration Controls reset delay and auto-

repeat delay for buttons A4h Page 53

23h R/W Group Configuration

Controls the detection dwell time

before a press is detected within

the group

47h Page 55

24h R/W Group Configuration

Controls reset delay and auto-

repeat delay for grouped sensors D4h Page 56

25h R/W Calibration Enable

Controls automatic calibration for

grouped sensors and sensors 1 - 7 FFh Page 57

26h R/W Calibration Activate Activates manual re-calibration for

grouped sensors and sensors 1 - 7 00h Page 57

Table 6.1 Register Set in Hexadecimal Order (continued)

ADDRESS R/W REGISTER NAME FUNCTION

DEFAULT

VALUE PAGE

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.0 (08-30-10) 36 SMSC CAP1214

DATASHEET

27h R/W Interrupt Enable 1

Enables Interrupts associated with

the grouped sensors and sensors

1 - 7

FFh Page 58

28h R/W Interrupt Enable 2 Enables Interrupts associated with

GPIOs 1 - 8 00h Page 58

29h R/W Sleep Channel

Control

Determines the number and which

channels are measured during

Sleep

00h Page 60

2Ah R/W Multiple Press

Configuration

Determines the number of

simultaneous presses to flag a

multiple press condition

82h Page 61

2Bh R/W Lid Closure

Configuration

Controls Lid Closure detection and

operation 00h Page 62

2Ch R/W Lid Closure Queue

Control

Controls how many samples must

exceed the lid closure threshold for

Button and Slider operation

02h Page 62

2Dh R/W Lid Closure Pattern 1 Stores pattern bits for lid closure

detection for channels 1 - 7 7Fh Page 63

2Eh R/W Lid Closure Pattern 2 Stores pattern bits for lid closure

detection for channels 8 - 14 7Fh Page 63

2Fh R/W Recalibration

Configuration

Determines re-calibration timing

and sampling window 93h Page 63

30h R/W Sensor 1 Threshold

Stores the delta count threshold to

determine a touch for Capacitive

Touch Sensor 1

40h Page 65

31h R/W Sensor 2 Threshold

Stores the delta count threshold to

determine a touch for Capacitive

Touch Sensor 2

40h Page 65

32h R/W Sensor 3 Threshold

Stores the delta count threshold to

determine a touch for Capacitive

Touch Sensor 3

40h Page 65

33h R/W Sensor 4 Threshold

Stores the delta count threshold to

determine a touch for Capacitive

Touch Sensor 4

40h Page 65

34h R/W Sensor 5 Threshold

Stores the delta count threshold to

determine a touch for Capacitive

Touch Sensor 5

40h Page 65

35h R/W Sensor 6 Threshold

Stores the delta count threshold to

determine a touch for Capacitive

Touch Sensor 6

40h Page 65

36h R/W Sensor 7 Threshold

Stores the delta count threshold to

determine a touch for Capacitive

Touch Sensor 7

40h Page 65

Table 6.1 Register Set in Hexadecimal Order (continued)

ADDRESS R/W REGISTER NAME FUNCTION

DEFAULT

VALUE PAGE

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1214 37 Revision 1.0 (08-30-10)

DATASHEET

37h R/W Group Threshold

Stores the delta count threshold to

determine a touch on any of the

Grouped Sensors

40h Page 65

38h R/W Button Noise

Threshold 1

Stores controls for selecting the

noise threshold for buttons 1 - 4 AAh Page 66

39h R/W Button Noise

Threshold 2

Stores controls for selecting the

noise threshold for buttons 5 - 7

and the Grouped sensors

AAh Page 66

3Ah R/W Lid Closure

Threshold 1

Stores controls for selecting the lid

closure threshold for buttons 1 - 4 AAh Page 67

3Bh R/W Lid Closure

Threshold 2

Stores controls for selecting the lid

closure threshold for buttons 5 - 8 AAh Page 67

3Ch R/W Lid Closure

Threshold 3

Stores controls for selecting the lid

closure threshold for buttons 9 - 12 AAh Page 67

3Dh R/W Lid Closure

Threshold 4

Stores controls for selecting the lid

closure threshold for buttons 13 -

0Ah Page 67

3Eh R/W Slider Velocity

Configuration

Determines speed parameters for

the slider C5h Page 68

3Fh R/W Digital Recalibration Forces digital recalibration for all

sensors 00h Page 70

40h R/W Configuration 2 Stores additional controls for

general operation 00h Page 70

41h R/W Grouped Channel

Sensor Enable

Stores controls to enable some or

all sensors in the group 7Fh Page 72

42h R/W Proximity Control Controls the sensitivity settings for

CS1 02h Page 73

46h R/W Grouped Sensor

Calibration Activate

Stores controls to force a

calibration on the individual

sensors in the Group

00h Page 57

4Eh R/W Sampling Channel

Select

Controls which channels are

affected by the Sampling

Configuration Register settings

00h Page 74

4Fh R/W Sampling

Configuration

Changes the sampling time for one

or more input channels 00h Page 75

50h R Sensor 1 Base Count Stores the reference count value

for sensor 1 00h Page 75

51h R Sensor 2 Base Count Stores the reference count value

for sensor 2 00h Page 75

52h R Sensor 3 Base Count Stores the reference count value

for sensor 3 00h Page 75

53h R Sensor 4 Base Count Stores the reference count value

for sensor 4 00h Page 75

Table 6.1 Register Set in Hexadecimal Order (continued)

ADDRESS R/W REGISTER NAME FUNCTION

DEFAULT

VALUE PAGE

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.0 (08-30-10) 38 SMSC CAP1214

DATASHEET

54h R Sensor 5 Base Count Stores the reference count value

for sensor 5 00h Page 75

55h R Sensor 6 Base Count Stores the reference count value

for sensor 6 00h Page 75

56h R Sensor 7 Base Count Stores the reference count value

for sensor 7 00h Page 75

57h R Sensor 8 Base Count Stores the reference count value

for sensor 8 00h Page 75

58h R Sensor 9 Base Count Stores the reference count value

for sensor 9 00h Page 75

59h R Sensor 10 Base

Count

Stores the reference count value

for sensor 10 00h Page 75

5Ah R Sensor 11 Base

Count

Stores the reference count value

for sensor 11 00h Page 75

5Bh R Sensor 12 Base

Count

Stores the reference count value

for sensor 12 00h Page 75

5Ch R Sensor 13 Base

Count

Stores the reference count value

for sensor 13 00h Page 75

5Dh R Sensor 14 Base

Count

Stores the reference count value

for sensor 14 00h Page 75

60h R LED Status 1 Stores status bits for LEDs 1 - 8 00h Page 76

61h R LED Status 2 Stores status bits for LEDs 9 - 11 00h Page 76

62h R/W Feedback

Configuration

Controls FEEDBACK pin duration

and frequency 00h Page 77

63h R/W Feedback Channel

Configuration 1

Controls whether sensors 1 - 7 can

assert the FEEDBACK pin 00h Page 78

64h R/W Feedback Channel

Configuration 2

Controls whether sensors 8 - 14

can assert the FEEDBACK pin 00h Page 78

65h R/W Feedback One-Shot Asserts FEEDBACK pin 00h Page 79

70h R/W LED / GPIO Direction Controls the direction for LED1/

GPIO1 through LED8 / GPIO8 00h Page 79

71h R/W LED / GPIO Output

Type

Controls the output type for LED1

/ GPIO1 through LED8 / GPIO8 00h Page 80

72h R GPIO Input Stores the pin state of LED1 /

GPIO1 through LED8 / GPIO8 00h Page 81

73h R/W LED Output Control 1 Controls the output state of the

LED drivers 1 - 8 00h Page 81

74h R/W LED Output Control 2 Controls the output state of the

LED drivers 9 - 11 00h Page 81

75h R/W LED Polarity 1 Controls the output polarity of

LEDs 1 - 8 00h Page 82

Table 6.1 Register Set in Hexadecimal Order (continued)

ADDRESS R/W REGISTER NAME FUNCTION

DEFAULT

VALUE PAGE

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1214 39 Revision 1.0 (08-30-10)

DATASHEET

76h R/W LED Polarity 2 Controls the output polarity of

LEDs 9 - 11 00h Page 82

77h R/W Linked LED

Transition Control 1

Controls transition effects of LEDS

1 - 7 when linked 00h Page 84

78h R/W Linked LED

Transition Control 2

Controls transition effects of LEDS

9 - 10 when linked 00h Page 84

79h R/W LED Mirror Control 1 Controls the duty cycle mirroring of

LEDs 1 - 8 00h Page 85

7Ah R/W LED Mirror Control 2 Controls the duty cycle mirroring of

LEDs 9 - 11 00h Page 85

80h R/W Sensor LED Linking Controls linking of CS1 - CS7 to

LED channels 00h Page 86

81h R/W LED Behavior 1 Controls the behavior and

response of LEDs 1 - 4 00h Page 87

82h R/W LED Behavior 2 Controls the behavior and

response of LEDs 5 - 8 00h Page 87

83h R/W LED Behavior 3 Controls the behavior and

response of LEDs 9 - 11 00h Page 87

84h R/W LED Pulse 1 Period Controls the period of each

breathe during a pulse 20h Page 89

85h R/W LED Pulse 2 Period Controls the period of breath and

pulse release operation 14h Page 91

86h R/W LED Breathe Period Controls the period of an LED

breathe operation 5Dh Page 92

88h R/W LED Configuration

Controls the number of pulses for

the Pulse 1 and Pulse 2 LED

behaviors

24h Page 92

8Ah R/W LED11 Configuration Controls LED11 base frequency

and steps 00h Page 93

90h R/W LED Pulse 1 Duty

Cycle

Determines the min and max duty

cycle for the pulse 1 operation F0h Page 94

91h R/W LED Pulse 2 Duty

Cycle

Determines the min and max duty

cycle for the pulse 2 operation F0h Page 94

92h R/W LED Breathe Duty

Cycle

Determines the min and max duty

cycle for the breathe operation F0h Page 94

93h R/W LED Direct Duty

Cycle

Determines the min and max duty

cycle for Direct mode LED

operation

F0h Page 94

94h R/W LED Direct Ramp

Rates

Determines the rising and falling

edge ramp rates of the LED 00h Page 95

95h R/W LED Off Delay Determines the off delay for some

LED behaviors 00h Page 96

Table 6.1 Register Set in Hexadecimal Order (continued)

ADDRESS R/W REGISTER NAME FUNCTION

DEFAULT

VALUE PAGE

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.0 (08-30-10) 40 SMSC CAP1214

DATASHEET

B1h R Sensor 1 Calibration

Stores the high byte of the 10-bit

value used to drive the analog

portion of sensor 1

00h Page 99

B2h R Sensor 2 Calibration

Stores the high byte of the 10-bit

value used to drive the analog

portion of sensor 2

00h Page 99

B3h R Sensor 3 Calibration

Stores the high byte of the 10-bit

value used to drive the analog

portion of sensor 3

00h Page 99

B4h R Sensor 4 Calibration

Stores the high byte of the 10-bit

value used to drive the analog

portion of sensor 4

00h Page 99

B5h R Sensor 5 Calibration

Stores the high byte of the 10-bit

value used to drive the analog

portion of sensor 5

00h Page 99

B6h R Sensor 6 Calibration

Stores the high byte of the 10-bit

value used to drive the analog

portion of sensor 6

00h Page 99

B7h R Sensor 7 Calibration

Stores the high byte of the 10-bit

value used to drive the analog

portion of sensor 7

00h Page 99

B8h R Sensor 8 Calibration

Stores the high byte of the 10-bit

value used to drive the analog

portion of sensor 8

00h Page 99

B9h R Sensor 9 Calibration

Stores the high byte of the 10-bit

value used to drive the analog

portion of sensor 9

00h Page 99

BAh R Sensor 10

Calibration

Stores the high byte of the 10-bit

value used to drive the analog

portion of sensor 10

00h Page 99

BBh R Sensor 11 Calibration

Stores the high byte of the 10-bit

value used to drive the analog

portion of sensor 11

00h Page 99

BCh R Sensor 12

Calibration

Stores the high byte of the 10-bit

value used to drive the analog

portion of sensor 12

00h Page 99

BDh R Sensor 13

Calibration

Stores the high byte of the 10-bit

value used to drive the analog

portion of sensor 13

00h Page 99

BEh R Sensor 14

Calibration

Stores the high byte of the 10-bit

value used to drive the analog

portion of sensor 14

00h Page 99

FDh R Product ID Stores a fixed value that identifies

the device 5Ah Page 100

Table 6.1 Register Set in Hexadecimal Order (continued)

ADDRESS R/W REGISTER NAME FUNCTION

DEFAULT

VALUE PAGE

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1214 41 Revision 1.0 (08-30-10)

DATASHEET

During Power-On-Reset (POR), the default values are stored in the registers. A POR is initiated when

power is first applied to the part and the voltage on the VDD supply surpasses the POR level as

specified in the electrical characteristics. Any reads to undefined registers will return 00h. Writes to

undefined registers will not have an effect.

When a bit is “set”, this means that the user writes a logic ‘1’ to it. When a bit is “cleared”, this means

that the user writes a logic ‘0’ to it.

6.1 Main Status Control Register

The Main Status and Control Register controls the primary power state of the device.

Bit 6 - DEACT - Deactivates all sensor scanning and LED activity.

‘0’ - (default) - Sensor scanning is active and LEDs are functional.

‘1’ - All sensor scanning is disabled and all linked LEDs are disabled (see Section 6.51). The only

way to restart scanning is to clear this bit. The status registers are automatically cleared and the

INT bit is cleared.

Bit 5 - SLEEP - Enables Sleep state by deactivating the LED activity and scanning those sensors

enabled via the Sleep Control register.

‘0’ (default) - Sensor scanning is active and LEDs are functional.

‘1’ - All LEDs are disabled (except LED11) and the Capacitive Touch Sensor scanning is limited to

the sensors set in the Sleep Channel Control register (see Section 6.22). The status registers will

not be cleared.

Bit 4 - DSLEEP - Enables the Deep Sleep state by deactivating all functions.

‘0’ (default) - Sensor scanning is active and LEDs are functional.

‘1’ - All sensor scanning is disabled. Except for LED11, all LEDs are driven to their programmed

non-actuated state and no PWM operations will be done. The device will return to its previous

power state when the ALERT pin is driven to its active level (see Section 5.8). The status registers

are automatically cleared and the INT bit is cleared. SMBus communications targeted at the

CAP1214 will bring the device out of deep sleep and automatically clear this bit.

FEh R Manufacturer ID Stores a fixed value that identifies

SMSC 5Dh Page 45

FFh R Revision Stores a fixed value that

represents the revision number 80h Page 101

Table 6.2 Main Status Control Register

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

00h R/W Main Status

Control - DEACT SLEEP DSLEEP - - PWR_

LED INT 00h

Table 6.1 Register Set in Hexadecimal Order (continued)

ADDRESS R/W REGISTER NAME FUNCTION

DEFAULT

VALUE PAGE

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.0 (08-30-10) 42 SMSC CAP1214

DATASHEET

Bit 1 - PWR_LED - Controls the output of LED11 based on the state of bits 5 and 4.

‘0’ (default) - The LED11 output is in the “inactive” or off state. The LED can still be driven by setting

bit 2 LED11_DR in the LED Output Control 2 Register (74h).

‘1’ - The LED11 output is active in one of the following conditions:

a. Both bits 4 and 5 are set to a logic ‘0’. The LED will behave as defined by the LED11_CTL

bits (see Section 6.51).

b. Either bit 4 or bit 5 is set to a logic ‘1’. The LED will behave as defined by the LED11_ALT

bits (see Section 6.51).

Bit 0 - INT - Indicates that there is an interrupt. This bit is only set if the ALERT pin has been asserted.

If a channel detects a press and its associated interrupt enable bit is set to a logic ‘0’, no action is

taken.

This bit is cleared by writing a logic ‘0’ to it. When this bit is cleared, the ALERT pin will be deasserted

and all status registers will be cleared if the condition has been removed.

‘0’ - No interrupt pending.

‘1’ - A button press has been detected on one or more channels and the interrupt has been

asserted.

6.2 Button Status Registers

The Button Status Registers store status bits that indicate a button press has been detected. A value

of ‘0’ in any bit indicates that no button press has been detected. A value of ‘1’ in any bit indicates

that a button press has been detected.

All status bits are cleared when the device enters the Deep Sleep or Inactive states (DSLEEP = ‘1’ or

DEACT = ‘1’ - see Section 6.1). All status bits are cleared when the INT bit is cleared and if a touch

on the respective Capacitive Touch Sensor is no longer present. If a touch is still detected, the bits will

not be cleared (but this will not cause the interrupt to be asserted - see Section 6.14)

APPLICATION NOTE: When the Button Status 1 Register is read, the Group Status register will be automatically

cleared. Therefore, the Group Status register should be read prior to reading the Button

Status Registers

6.2.1 Button Status 1

Bit 7 - UP - Indicates that a slide was detected on increasing sensors (i.e. Sensor 8 -> Sensor 9 ->

Sensor 10). This bit is also set if a press is detected on the “Up” portion of the slider. If the Group

auto-repeat is enabled, the ALERT pin will be periodically asserted while a slide or press and hold

event is still detected. This bit is sticky and will remain set until cleared. Once cleared, it will be re-set

when another interrupt is generated in the “UP” direction. This bit is automatically cleared if the DOWN

bit is set.

Bit 6 - DOWN - Indicates that a slide was detected on decreasing sensors (i.e. Sensor 14 -> Sensor

13-> Sensor 12). This bit is also set if a press is detected on the “Down” portion of the slider. If the

Group auto-repeat is enabled, the ALERT pin will be periodically asserted while a slide or press and

hold event is still detected. This bit is sticky and will remain set until cleared. Once cleared, it will be

Table 6.3 Button Status Registers

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

03h R Button Status 1 UP DOWN CS6 CS5 CS4 CS3 CS2 CS1 00h

04h R Button Status 2 CS14 CS13 CS12 CS11 CS10 CS9 CS8 CS7 00h

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1214 43 Revision 1.0 (08-30-10)

DATASHEET

re-set when another interrupt is generated in the “DOWN” direction. This bit is automatically cleared if

the UP bit is set.

Bit 5 - CS6 - Indicates that a press was detected on Sensor 6. This sensor can be linked to LED6.

‘0’ - A touch was not detected on the corresponding button.

‘1’ - A touch was detected on the corresponding button.

Bit 4 - CS5 - Indicates that a press was detected on Sensor 5. This sensor can be linked to LED5.

Bit 3 - CS4 - Indicates that a press was detected on Sensor 4. This sensor can be linked to LED4.

Bit 2 - CS3 - Indicates that a press was detected on Sensor 3. This sensor can be linked to LED3

Bit 1 - CS2 - Indicates that a press was detected on Sensor 2. This sensor can be linked to LED2.

Bit 0 - CS1 - Indicates that a press was detected on Sensor 1. This sensor can be linked to LED1.

6.2.2 Button Status 2

Bit 7 - CS14 - Indicates that press was detected on Sensor 14. This sensor is part of the group which

can be linked to LED9 and LED10.

Bit 6 - CS13 - Indicates that press was detected on Sensor 13. This sensor is part of the group which

can be linked to LED9 and LED10.

Bit 5 - CS12 - Indicates that press was detected on Sensor 12. This sensor is part of the group which

can be linked to LED9 and LED10.

Bit 4 - CS11 - Indicates that press was detected on Sensor 11. This sensor is part of the group which

can be linked to LED9 and LED10.

Bit 3 - CS10 - Indicates that press was detected on Sensor 10. This sensor is part of the group which

can be linked to LED9 and LED10.

Bit 2 - CS9 - Indicates that press was detected on Sensor 9. This sensor is part of the group which

can be linked to LED9 and LED10.

Bit 1 - CS8 - Indicates that press was detected on Sensor 8. This sensor is part of the group which

can be linked to LED9 and LED10.

Bit 0 - CS7 - Indicates that a press was detected on Sensor 7. This sensor can be linked to LED7.

6.3 Build Revision Register

The Build Revision Register indicates hardware defined settings that are used.

Table 6.4 Build Revision Register

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

05h R Build Revision - - - Build4 Build3 Build2 Build1 Build0 10h

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.0 (08-30-10) 44 SMSC CAP1214

DATASHEET

6.4 Slider Position / Volumetric Data Register

The Slider Position / Volumetric Data Register indicates the absolute position of a Tap, Slide, or Press

and Hold event detected on the Grouped sensors (slider). Alternately, the register stores volumetric

data that increases or decreased based on detected operations on the Grouped sensors (slider).

Bits 6-0 - POS[6:0] - Indicate absolute position or volumetric data as determined by the POS_VOL bit

(see Section 6.14).

6.4.1 Absolute Position

The absolute position of a single touch is available from this register. By interpolating information from

up to 3 adjacent buttons, 16 different positions are calculated by the CAP1214 from the center of one

button to the center of each adjacent button. The bits will encode a range from 2 to 98 indicative of

where the touch occurred. Table 6.6 shows an example of the settings assuming a single button is

pressed.

If a slide is detected on the Grouped sensors, the POS[6:0] bits will indicate the most recently touched

sensor (i.e. where the slide ended) however will not indicate where the slide originated.

APPLICATION NOTE: When the device enters the Deep Sleep state, the Slider Position / Volumetric Data Register

(06h) is cleared, if the register is set to represent position data.

APPLICATION NOTE: The register will be cleared to a value of 00h when it is read. It will be set to a valid position

when the next ALERT is generated. It will be updated at the respective repeat rate for a slide

or press and hold event regardless of whether it has been read or not. Therefore, it will only

show the position of the last touch detected at the time of the interrupt.

Table 6.5 Slider Position / Volumetric Data Register

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

06h R-C /

R/W

Slider Position /

Volumetric Data - POS[6:0] 00h

Table 6.6 Example Slider Absolute Position Decode

TOUCH POSITION

POS[6:0]

SETTINGS

CS8 02h (2d)

CS9 12h (18d)

CS10 22h (34d)

CS11 32h (50d)

CS12 42h (68d)

CS13 52h (82d)

CS14 62h (98d)

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1214 45 Revision 1.0 (08-30-10)

DATASHEET

6.4.2 Volumetric Data

If they are setup to present Volumetric Data (see Section 6.14), the bits will encode a range from 0 to

100. This value is updated based on the Grouped sensor activity:

A slide in the “UP” direction will increase the volumetric data by the Volumetric Step setting (see

Section 6.6) whenever an interrupt is generated (including extra interrupts generated after the slide

is complete).

A slide in the “DOWN” direction will decrease the volumetric data by the Volumetric Step setting

(see Section 6.6) whenever an interrupt is generated (including extra interrupts generated after the

slide is complete)

A tap (see Section 5.5.1) on the “UP” side will increase the volumetric data by a value of 1.

A tap on the “DOWN” side will decrease the volumetric data by a value of 1.

A press and hold (see Section 5.5.2) on the “UP” side will increase the volumetric data by a value

of 1 at every repeat rate interval.

A press and hold (see Section 5.5.2) on the “DOWN” side will decrease the volumetric data by a

value of 1 at every repeat rate interval.

The bits are read / write.

6.5 Vendor ID Register

The Vendor ID Register stores an 8-bit value that represents SMSC.

6.6 Volumetric Step Register

The Volumetric Step Register controls the size of a step to the volumetric data when a slide is detected

in the UP and DOWN directions.

Bits 3 - 0 - VOL_STEP[3:0] - Determines the volumetric data step when a slide is detected. Each LSB

corresponds to a value of ±1.

Table 6.7 Vendor ID Register

ADDRR/W REGISTER B7B6B5B4B3B2B1B0DEFAULT

08h

R Vendor ID 01011101 5Dh

FEh

Table 6.8 Volumetric Step Register

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

09hR/WVolumetric Step---- VOL_STEP[3:0] 01h

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.0 (08-30-10) 46 SMSC CAP1214

DATASHEET

6.7 Noise Status Registers

The Noise Status Registers store status bits that are generated from the analog block if the detected

noise is above the operating region of the analog detector or the RF noise detector. These bits indicate

that the most recently received data from the sensor is invalid and should not be used for touch

detection. As long as the bit is set for a particular channel, the delta count value is reset to 00h and

thus no touch is detected.

When set, the S1_RF_NOISE (register 0Ah, bit 7) indicates that the CS1 RF noise detector has

detected noise.

These bits are not sticky and will be cleared automatically if the analog block does not report a noise

error.

APPLICATION NOTE: For the CAP1214-2, if the lid closure detection circuitry is enabled, these bits count as

sensors above the lid closure count threshold even if the corresponding data count is not. If

the corresponding data byte exceeds the lid closure threshold, it is not counted twice.

APPLICATION NOTE: Regardless of the state of the Noise Status bits, if low frequency noise is detected on a

sensor, that sample will be discarded unless the DIS_ANA_NOISE bit is set. As well, if RF

noise is detected on a sensor, that sample will be discarded unless the DIS_RF_NOISE bit

is set.

6.8 Lid Closure Status Registers

The Lid Closure Status Registers bits are only set if the lid closure detection circuitry is enabled (see

Section 6.24). These status bits indicate that the corresponding Capacitive Touch Sensor exceeded the

Lid Closure threshold. These bits will be set if a button press is detected because the Lid Closure

threshold is a percentage of the Sensor Threshold.

These bits are used in combination with the Lid Closure Pattern register settings to determine when a

Lid Closure Event is flagged (see Section 6.26).

These bits are not sticky and will be cleared automatically when the corresponding sensor count drops

below the lid closure count threshold. The device does not flag a sensor as above or below the

threshold until it has cycled through the queue (see Section 6.25, "Lid Closure Queue Control

Table 6.9 Noise Status Registers

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

0Ah R Noise Status 1 S1_RF_

NOISE

S7_

NOISE

S6_

NOISE

S5_

NOISE

S4_

NOISE

S3_

NOISE

S2_

NOISE

S1_

NOISE 00h

0Bh R Noise Status 2 - S14_

NOISE

S13_

NOISE

S12_

NOISE

S11_

NOISE

S10_

NOISE

S9_

NOISE

S8_

NOISE 00h

Table 6.10 Lid Closure Status Registers

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

0Ch R Lid Closure

Status 1 -S7_

LID

S6_

LID

S5_

LID

S4_

LID

S3_

LID

S2_

LID

S1_

LID 00h

0Dh R Lid Closure

Status 2 -S14_

LID

S13_

LID

S12_

LID

S11_

LID

S10_

LID

S9_

LID

S8_

LID 00h

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DATASHEET

APPLICATION NOTE: It is likely that recalibration will occur while the lid is closed, resulting in negative delta counts

until recalibration takes place.

6.9 GPIO Status Register

The GPIO Status Register bits are set whenever one of the GPIO inputs changes states. If the LEDx

/ GPIOx pin is not configured as a GPIO or as an input, the respective bit will be set to a logic ‘0’.

The bits are cleared when the register is read.

6.10 Group Status Register

The Group Status Register indicates that one or more actions were detected on the Grouped sensors.

The detectable actions are described in Section 5.5 and Section 5.6.

Bit 7 - LID - Indicates that a Lid Closure Event has been detected. This bit is sticky. When it is set, it

will remain set until read. When a Lid Closure Event is detected, all new touches will be blocked.

Bit 6 - MULT - This bit is asserted if one or more touches are being blocked because greater than N

buttons are simultaneously pressed.

Bit 5 - RESET - Indicates that the device has exited the reset state. This bit may be set via a power

on reset or upon release of the RESET pin. When it is set, it will remain set until read.

Bit 3 - UP - Indicates that a slide was detected on increasing sensors (i.e. Sensor 8 -> Sensor 9 ->

Sensor 10) or on CS14 when the Grouped sensors are ungrouped. This bit is also set if a touch (tap

or press and hold event) is detected on the “Up” portion of the slider. If the Group auto-repeat is

enabled, the ALERT pin will be periodically asserted while a slide or press and hold event is detected.

This bit will be cleared when read and re-set when another interrupt is generated. This bit is cleared

automatically if the DOWN bit is set.

Bit 2 - DOWN - Indicates that a slide was detected on decreasing sensors (i.e. Sensor 14 -> Sensor

13 -> Sensor 12) or on CS8 when the Grouped sensors are ungrouped. This bit is also set if a touch

(tap or press and hold event) is detected on the “Down” portion of the slider. If the Group auto-repeat

is enabled, the ALERT pin will be periodically asserted while a slide or press and hold event is

detected. This bit will be cleared when read and re-set when another interrupt is generated. This bit

is automatically cleared if the UP bit is set.

Bit 1 - TAP - Indicates that a tap was detected on one of the sensors within the Group. The relative

position of the tap is indicated by the UP and DOWN bits so that a tap on the “UP” side of the group

will assert the UP bit as well as the TAP bit. If the tap event is detected in the “center” of the slider

that is neither “UP” nor “DOWN”, the bit will be set; however, no interrupt will be generated. This bit

is sticky and will remain set until read.

Table 6.11 GPIO Status Register

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

0Eh R-C GPIO Status GPIO8_

STS

GPIO7_

STS

GPIO6_

STS

GPIO5_

STS

GPIO4_

STS

GPIO3_

STS

GPIO2_

STS

GPIO1_

STS 00h

Table 6.12 Group Status Register

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

0Fh R-C Group Status LID MULT RESET - UP DOWN TAP PH 00h

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Bit 0 - PH - Indicates that a press and hold event was detected on one of the sensors within the Group.

the relative position of the press is indicated by the UP and DOWN bits so a touch and hold on the

“UP” side of the group will assert the UP bit as well as the PH bit. If the press and hold event is

detected in the “center” of the slider that is neither “UP” nor “DOWN”, the bit will be set; however, no

interrupt will be generated. This bit is sticky and will remain set until read. If the condition is still

present, this bit will be re-set when the interrupt is generated.

6.11 Sensor Delta Count Registers

The Sensor Delta Count Registers store the delta count that is compared against the threshold used

to determine if a touch has been detected. The count value represents a change in input due to the

capacitance associated with a touch on one of the sensors and is referenced to a calibrated base “Not

Touched” count value. The delta is an instantaneous change and is updated once per sensor per

sensing cycle (see Section 5.4.4 - sensor cycle).

Table 6.13 Sensor Delta Count Registers

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

10h R Sensor 1 Delta

Count Sign 64 32 16 8 4 2 1 00h

11h R Sensor 2 Delta

Count Sign 64 32 16 8 4 2 1 00h

12h R Sensor 3 Delta

Count Sign 64 32 16 8 4 2 1 00h

13h R Sensor 4 Delta

Count Sign 64 32 16 8 4 2 1 00h

14h R Sensor 5 Delta

Count Sign 64 32 16 8 4 2 1 00h

15h R Sensor 6 Delta

Count Sign 64 32 16 8 4 2 1 00h

16h R Sensor 7 Delta

Count Sign 64 32 16 8 4 2 1 00h

17h R Sensor 8 Delta

Count Sign 64 32 16 8 4 2 1 00h

18h R Sensor 9 Delta

Count Sign 64 32 16 8 4 2 1 00h

19h R Sensor 10

Delta Count Sign 64 32 16 8 4 2 1 00h

1Ah R Sensor 11

Delta Count Sign 64 32 16 8 4 2 1 00h

1Bh R Sensor 12

Delta Count Sign 64 32 16 8 4 2 1 00h

1Ch R Sensor 13

Delta Count Sign 64 32 16 8 4 2 1 00h

1Dh R Sensor 14

Delta Count Sign 64 32 16 8 4 2 1 00h

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DATASHEET

The value presented is a standard 2’s complement number. In addition, the value is capped at a value

of 7Fh. A reading of 7Fh indicates that the sensitivity settings are too high and should be adjusted

accordingly (see Section 6.13).

The value is also capped at a negative value of FFh for negative delta counts which may result upon

a release.

6.12 Queue Control Register

The Queue Control Register determines the number of consecutive samples for which a single sensor

output is above the Sensor Threshold before a touch is detected. This is also used to determine the

number of consecutive samples used to detect a button release. The queue applies independently to

all channels. This register also determines how the noise status bits affect some data.

Bit 5 - NO_CLR_INTD - Controls whether the accumulation of intermediate data is cleared if the noise

status bit is set.

‘0’ (default) - The accumulation of intermediate data is cleared if the noise status bit is set.

‘1’ - The accumulation of intermediate data is not cleared if the noise status bit is set.

APPLICATION NOTE: Bits 4 and 5 should both be set to the same value. Either both should be set to ‘0’ or both

should be set to ‘1’.

Bit 4 - NO_CLR_NEG - Controls whether the consecutive negative delta counts counter is cleared if

the noise status bit is set.

‘0’ (default) - The consecutive negative delta counts counter is cleared if the noise status bit is set.

‘1’ - The consecutive negative delta counts counter is not cleared if the noise status bit is set.

Bits 2 - 0 - QUEUE_B[2:0] - The number of consecutive samples necessary to detect a touch. Default

is 3 consecutive samples. See Table 6.15.

Table 6.14 Queue Control Register

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

1Eh R/W Queue Control - -

NO_

CLR_

INTD

NO_

CLR_

NEG

- QUEUE_B[2:0] 03h

Table 6.15 QUEUE_B Bit Decode

QUEUE_B[2:0]

NUMBER OF CONSECUTIVE

READINGS > THRESHOLD21 0

00 0 1

00 1 1

01 0 2

0 1 1 3 (default)

10 0 4

10 1 5

11 0 6

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6.13 Data Sensitivity Registers

The Data Sensitivity Register controls the sensitivity of all button channels.

Bits 6- 4 DELTA_SENSE[2:0] - Controls the sensitivity of a touch detection. The sensitivity settings act

to scale the relative delta count value higher or lower based on the system parameters. A setting of

000b is the most sensitive while a setting of 111b is the least sensitive (see Ta b l e 6 . 1 7 ). At the more

sensitive settings, touches are detected for a smaller delta C corresponding to a “lighter” touch. These

settings are more sensitive to noise and a noisy environment may flag more false touches than less

sensitive levels.

APPLICATION NOTE: A value of 128x is the most sensitive setting available. At the most sensitive settings, the

MSB of the Delta Count register represents 64 out of ~25,000 which corresponds to a touch

of approximately 0.25% of the base capacitance (or a ΔC of 25fF from a 10pF base

capacitance). Conversely, a value of 1x is the least sensitive setting available. At these

settings, the MSB of the Delta Count register corresponds to a delta count of 8192 counts

out of ~25,000 which corresponds to a touch of approximately 33% of the base capacitance

(or a ΔC of 3.33pF from a 10pF base capacitance).

Bits 3 - 0 - BASE_SHIFT [3:0] - Controls the scaling and data presentation of the Base Count registers.

The higher the value of these bits, the larger the range and the lower the resolution of the data

11 1 7

Table 6.16 Data Sensitivity Register

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

1Fh R/W Data Sensitivity - DELTA_SENSE[2:0] BASE_SHIFT[3:0] 2Fh

Table 6.17 DELTA_SENSE Bit Decode

DELTA_SENSE[2:0]

SENSITIVITY MULTIPLIER210

0 0 0 128x (most sensitive)

001 64x

0 1 0 32x (default)

011 16x

100 8x

101 4x

110 2x

1 1 1 1x - (least sensitive)

Table 6.15 QUEUE_B Bit Decode (continued)

QUEUE_B[2:0]

NUMBER OF CONSECUTIVE

READINGS > THRESHOLD21 0

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DATASHEET

presented. The scale factor represents the multiplier to the bit-weighting presented in these register

descriptions. See Ta b l e 6 . 1 8 .

APPLICATION NOTE: The BASE_SHIFT[3:0] bits normally do not need to be updated. These settings will not affect

touch detection or sensitivity. These bits are sometimes helpful in analyzing the Cap Sensing

board performance and stability.

6.14 Configuration Register

The Configuration Register controls general global functionality that affects the entire device.

Bit 7 - TIMEOUT - Enables the time-out and idle functionality of the SMBus protocol.

‘0’ (default) - The SMBus time-out and idle functionality are disabled. The SMBus interface will not

time out if the clock line is held low. Likewise, it will not reset if both the data and clock lines are

held high for longer than 150us. This is used for I2C compliance.

‘1’ - The SMBus time-out and idle functionality are enabled. The SMBus interface will time out if

the clock line is held low for longer than 30ms. Likewise, it will reset if both the data and clock lines

are held high for longer than 150us.

Bit 6 - POS_VOL - Determines the behavior of the POS[6:0] status bits when a Grouped sensor is

activated - see Section 6.4.

‘0’ (default) - The POS[6:0] bits represent position information that indicates which sensor was

touched or the last sensor touched during a slide.

Table 6.18 BASE_SHIFT Bit Decode

BASE_SHIFT[3:0]

DATA SCALING

FACTOR32 1 0

00 0 0 1x

00 0 1 2x

00 1 0 4x

00 1 1 8x

01 0 0 16x

01 0 1 32x

01 1 0 64x

0 1 1 1 128x

1 0 0 0 256x

All others 256x

(default = 1111b)

Table 6.19 Configuration Register

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

20h R/W Configuration TIME

OUT

POS_

VOL

DIS_

DIG_

NOISE

DIS_

ANA_

NOISE

MAX_

DUR_

EN_B

RPT_

EN_B

MAX_

DUR_

EN_G

RPT_

EN_G 29h

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‘1’ - The POS[6:0] bits represent volumetric data. The Position / Volumetric Data register is read /

write.

Bit 5 - DIS_DIG_NOISE - Determines whether the digital noise threshold (see Section 6.29, "Button

Noise Threshold Registers") is used by the device. Setting this bit disables the feature.

‘0’ - The digital noise threshold is used. If a delta count value exceeds the noise threshold but does

not exceed the touch threshold, the sample is discarded and not used for the automatic re-

calibration routine.

‘1’ (default) - The noise threshold is disabled. Any delta count that is less than the touch threshold

is used for the automatic re-calibration routine.

Bit 4 - DIS_ANA_NOISE - Determines whether the analog noise filter is enabled. Setting this bit

disables the feature.

‘0’ (default) - If low frequency noise is detected by the analog block, the delta count on the

corresponding channel is set to 0. Note that this does not require that Noise Status bits be set.

‘1’ - A touch is not blocked even if low frequency noise is detected.

Bit 3 - MAX_DUR_EN_B - Determines whether the maximum duration recalibration is enabled for non-

grouped sensors.

‘0’ - The maximum duration recalibration functionality is disabled. A press may be held indefinitely

and no re-calibration will be performed on any button.

‘1’ (default) - The maximum duration recalibration functionality is enabled. If a press is held for

longer than the MAX_DUR_B bit settings, the re-calibration routine will be restarted (see

Section 6.16).

Bit 2 - RPT_EN_B - Determines whether repeat rate is enabled for all buttons.

‘0’ (default) - Repeat rate is not enabled. An interrupt will be generated when a touch is detected.

‘1’ - Repeat rate is enabled for all buttons.

Bit 1 - MAX_DUR_EN_G - Determines whether the maximum duration recalibration is enabled for

grouped sensors.

‘0’ (default) - The maximum duration recalibration functionality is disabled. A press may be held

indefinitely and no re-calibration will be performed on any button.

‘1’ - The maximum duration recalibration functionality is enabled. If a press is held for longer than

the MAX_DUR_G bit settings, the re-calibration routine will be restarted (see Section 6.18).

Bit 0 - RPT_EN_G - Determines the interrupt mechanism used when a Press and Hold event is

detected on a grouped sensor.

‘0’ - An interrupt will be generated when a Press and Hold event is detected.

‘1’ (default) - An interrupt will be generated when a Press and Hold event is detected and at the

programmed repeat rate so long as the sensor is pressed.

6.15 Sensor Enable Register

The Sensor Enable Register determines whether a Capacitive Touch Sensor input is included in the

sampling cycle in the fully active state. The length of the sampling cycle is not affected by the number

of sensors measured.

Table 6.20 Sensor Enable Register

ADDRR/WREGISTERB7 B6B5B4B3B2B1B0DEFAULT

21h R/W Sensor Enable GP_EN S7_EN S6_EN S5_EN S4_EN S3_EN S2_EN S1_EN FFh

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DATASHEET

Bit 7 - GP_EN - Enables the Grouped Sensors to be included during the sampling cycle.

‘0’ - All sensors in the grouped sensors will not be sampled regardless of the state of the

VOL_UP_DOWN bit.

‘1’ (default) - Grouped sensors will be sampled. Individual channels are enabled via the Group

Sampling Enable register.

Bit 6 - S7_EN - Enables the CS7 input to be included during the sampling cycle.

‘0’ - The CS7 input is not included in the sampling cycle.

‘1’ (default) - The CS7 input is included in the sampling cycle.

Bit 5 - S6_EN - Enables the CS6 input to be included during the sampling cycle.

Bit 4 - S5_EN - Enables the CS5 input to be included during the sampling cycle.

Bit 3 - S4_EN - Enables the CS4 input to be included during the sampling cycle.

Bit 2 - S3_EN - Enables the CS3 input to be included during the sampling cycle.

Bit 1 - S2_EN - Enables the CS2 input to be included during the sampling cycle.

Bit 0 - S1_EN - Enables the CS1 input to be included during the sampling cycle.

6.16 Button Configuration Register

The Button Configuration Register controls timings associated with the Capacitive Sensor channels 1

- 7 that are not Grouped.

Bits 7 - 4 - MAX_DUR_B [3:0] - (default 1010b) - Determines the maximum time that a button is

allowed to be pressed until the Capacitive Touch sensor is recalibrated as shown in Ta b l e 6 . 2 2 .

Bits 3 - 0 - RPT_RATE_B[3:0] - (default 0100b) Determines the time duration between interrupt

assertions when auto repeat is enabled. The resolution is 35ms the range is from 35ms to 560ms as

shown in Ta b l e 6 . 2 3 .

Table 6.21 Button Configuration Register

ADDRR/W REGISTER B7 B6 B5B4B3B2B1B0DEFAULT

22h R/W Button

Configuration MAX_DUR_B[3:0] RPT_RATE_B[3:0] A4h

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Table 6.22 MAX_DUR_B and MAX_DUR_G Bit Decode

MAX_DUR_B[3:0] AND MAX_DUR_G[3:0]

TIME BEFORE

RECALIBRATION321 0

0 0 0 0 560ms

0 0 0 1 840ms

0 0 1 0 1120ms

0 0 1 1 1400ms

0 1 0 0 1680ms

0 1 0 1 2240ms

0 1 1 0 2800ms

0 1 1 1 3360ms

1 0 0 0 3920ms

1 0 0 1 4480ms

101 0 5600ms

(default for CS1 - CS7)

1 0 1 1 6720ms

1 1 0 0 7840ms

110 1 8906ms

(default for Grouped Sensors)

1 1 1 0 10080ms

1 1 1 1 11200ms

Table 6.23 RPT_RATE_B / SL / PH Bit Decode

RPT_RATE_B / RPT_RATE_SL / RPT_RATE_PH

INTERRUPT REPEAT

RATE 32 1 0

0 0 0 0 35ms

0 0 0 1 70ms

0 0 1 0 105ms

0 0 1 1 140ms

01 0 0 175ms

(default)

0 1 0 1 210ms

0 1 1 0 245ms

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6.17 Group Configuration Register 1

The Group Configuration 1 Register controls timings associated with the Capacitive Sensor channels

8 - 14 that are included in the group.

Bits 7-4 - RPT_RATE_PH[3:0] - (default 0100b) Determines the time duration between interrupt

assertions when auto repeat is enabled. This setting applies when a press and hold condition is

detected on the on the Grouped Sensors (see Section 5.5). The resolution is 35ms the range is from

35ms to 560ms as shown in Table 6.23.

Bits 3- 0 - M_PRESS[3:0] - (default 0111b) - Determines the minimum amount of time that a sensor

in the Group must detect a button press to differentiate between a tap and a press and hold. If the

sensor detects a touch for longer than the M_PRESS[3:0] settings, a Press and Hold event is detected.

This has no effect on whether a slide is detected within the group. If a slide is detected before or after

the press has been confirmed, it is treated as a separate event. If a sensor detects a touch for less

than or equal to the M_PRESS[3:0] settings, a Tap event is detected.

The resolution is 35ms the range is from 35ms to 560ms as shown in Table 6.25.

0 1 1 1 280ms

1 0 0 0 315ms

1 0 0 1 350ms

1 0 1 0 385ms

1 0 1 1 420ms

1 1 0 0 455ms

1 1 0 1 490ms

1 1 1 0 525ms

1 1 1 1 560ms

Table 6.24 Group Configuration Register 1

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

23h R/W Group

Configuration 1 RPT_RATE_PH[3:0] M_PRESS[3:0] 47h

Table 6.25 M_PRESS Bit Decode

M_PRESS[3:0]

M_PRESS TIME32 1 0

0 0 0 0 35ms

0 0 0 1 70ms

Table 6.23 RPT_RATE_B / SL / PH Bit Decode (continued)

RPT_RATE_B / RPT_RATE_SL / RPT_RATE_PH

INTERRUPT REPEAT

RATE 32 1 0

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6.18 Group Configuration Register 2

The Group Configuration 2 Register controls timings associated with the Capacitive Sensor channels

8 - 14 that are included in the group.

Bits 7 - 4 - MAX_DUR_G [3:0] - (default 1101b) - Determines the maximum time that a button is

allowed to be pressed until the Capacitive Touch sensor is recalibrated as shown in Ta b l e 6 . 2 2 .

Bits 3 - 0 - RPT_RATE_SL[3:0] - (default 0100b) Determines the time duration between interrupt

assertions when auto repeat is enabled. This setting applies when a slide is detected on the Grouped

Sensors and acts as the base repeat rate that is adjusted based on the slide speed (see Section 5.5.5).

The resolution is 35ms the range is from 35ms to 560ms as shown in Table 6.23.

0 0 1 0 105ms

0 0 1 1 140ms

0 1 0 0 175ms

0 1 0 1 210ms

0 1 1 0 245ms

01 1 1 280ms

(default)

1 0 0 0 315ms

1 0 0 1 350ms

1 0 1 0 385ms

1 0 1 1 420ms

1 1 0 0 455ms

1 1 0 1 490ms

1 1 1 0 525ms

1 1 1 1 560ms

Table 6.26 Group Configuration Register 2

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

24h R/W Group

Configuration 2 MAX_DUR_G[3:0] RPT_RATE_SL[3:0] D4h

Table 6.25 M_PRESS Bit Decode (continued)

M_PRESS[3:0]

M_PRESS TIME32 1 0

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DATASHEET

6.19 Calibration Enable Register

The Calibration Enable Register controls whether the indicated Capacitive Touch Sensor input is

automatically re-calibrated. If a sensor is not enabled, the corresponding calibration enable bit is

ignored.

Bit 7- G_CEN - Enables all sensors in the group to be re-calibrated simultaneously.

‘0’ - None of the grouped channels are automatically re-calibrated. They can be re-calibrated

manually by setting the G_CAL bit.

‘1’ (default) - All of the grouped channels are automatically re-calibrated as the CAP1214 samples.

Bit 6 - S7_CEN - Enables the CS7 input to be re-calibrated automatically.

‘0’ - The CS7 input is not automatically re-calibrated.

‘1’ (default) - The CS7 input is automatically re-calibrated as the CAP1214 samples.

Bit 5 - S6_CEN - Enables the CS6 input to be re-calibrated automatically.

Bit 4 - S5_CEN - Enables the CS5 input to be re-calibrated automatically.

Bit 3 - S4_CEN - Enables the CS4 input to be re-calibrated automatically.

Bit 2 - S3_CEN - Enables the CS3 input to be re-calibrated automatically.

Bit 1 - S2_CEN - Enables the CS2 input to be re-calibrated automatically.

Bit 0 - S1_CEN - Enables the CS1 input to be re-calibrated automatically.

6.20 Calibration Activate Registers

The Calibration Activate Registers force the respective sensors to be re-calibrated. When a bit is set,

the corresponding Capacitive Touch Sensor will be re-calibrated and the bit will be automatically

cleared once the re-calibration routine has finished. This calibration routine will update the internal

analog controls and gain settings followed by a digital calibration to capture the base count for touch

detection. During the re-calibration routine, the sensors will not detect a press for up to 600ms and the

Sensor Base Count register values will be invalid. During this time, any press on the corresponding

sensors will invalidate the re-calibration.

Table 6.27 Calibration Enable Register

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

25h R/W Calibration

Enable

CEN

S7_

CEN

S6_

CEN

S5_

CEN

S4_

CEN

S3_

CEN

S2_

CEN

S1_

CEN FFh

Table 6.28 Calibration Activate Registers

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

26h R/W Calibration

Activate

CAL

S7_

CAL

S6_

CAL

S5_

CAL

S4_

CAL

S3_

CAL

S2_

CAL

S1_

CAL 00h

46h R/W

Grouped

Sensor

Calibration

Activate

S14_

CAL

S13_

CAL

S12_

CAL

S11_

CAL

S10_

CAL

S9_

CAL

S8_

CAL 00h

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6.20.1 Calibration Activate - 26h

Bit 7 - G_CAL - When set, all sensors in the group are re-calibrated. This bit is automatically cleared

once all of the sensors in the group have been re-calibrated successfully.

Bit 6 - S7_CAL - When set, the CS7 input is re-calibrated. This bit is automatically cleared once the

sensor has been re-calibrated successfully.

Bit 5 - S6_CAL - When set, the CS6 input is re-calibrated. This bit is automatically cleared once the

sensor has been re-calibrated successfully.

Bit 4 - S5_CAL - When set, the CS5 input is re-calibrated. This bit is automatically cleared once the

sensor has been re-calibrated successfully.

Bit 3 - S4_CAL - When set, the CS4 input is re-calibrated. This bit is automatically cleared once the

sensor has been re-calibrated successfully.

Bit 2 - S3_CAL - When set, the CS3 input is re-calibrated. This bit is automatically cleared once the

sensor has been re-calibrated successfully.

Bit 1 - S2_CAL - When set, the CS2 input is re-calibrated. This bit is automatically cleared once the

sensor has been re-calibrated successfully.

Bit 0 - S1_CAL - When set, the CS1 input is re-calibrated. This bit is automatically cleared once the

sensor has been re-calibrated successfully.

6.20.2 Grouped Sensor Calibration Activate - 46h

Bit 6 - S14_CAL - When set, the CS14 input is re-calibrated. This bit is automatically cleared once the

sensor has been re-calibrated successfully.

Bit 5 - S13_CAL - When set, the CS13 input is re-calibrated. This bit is automatically cleared once the

sensor has been re-calibrated successfully.

Bit 4 - S12_CAL - When set, the CS12 input is re-calibrated. This bit is automatically cleared once the

sensor has been re-calibrated successfully.

Bit 3 - S11_CAL - When set, the CS11 input is re-calibrated. This bit is automatically cleared once the

sensor has been re-calibrated successfully.

Bit 2 - S10_CAL - When set, the CS10 input is re-calibrated. This bit is automatically cleared once the

sensor has been re-calibrated successfully.

Bit 1 - S9_CAL - When set, the CS9 input is re-calibrated. This bit is automatically cleared once the

sensor has been re-calibrated successfully.

Bit 0 - S8_CAL - When set, the CS8 input is re-calibrated. This bit is automatically cleared once the

sensor has been re-calibrated successfully.

6.21 Interrupt Enable Registers

Table 6.29 Interrupt Enable Registers

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

27h R/W Interrupt

Enable 1

INT_

S7_

INT_

S6_

INT_

S5_

INT_

S4_

INT_

S3_

INT_

S2_

INT_

S1_

INT_

FFh

28h R/W Interrupt

Enable 2

GPIO8_

INT_EN

GPIO7_

INT_EN

GPIO6_

INT_EN

GPIO5_

INT_EN

GPIO4_

INT_EN

GPIO3_

INT_EN

GPIO2_

INT_EN

GPIO1_

INT_EN 00h

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1214 59 Revision 1.0 (08-30-10)

DATASHEET

The Interrupt Enable Registers determine whether a button press or GPIO input changing state causes

the interrupt pin to be asserted.

6.21.1 Interrupt Enable 1

Bit 7 - G_INT_EN - Enables the interrupt pin to be asserted if a slide, tap, or press and hold action is

detected on the grouped sensors.

‘0’ - The interrupt pin will not be asserted if a slide, tap, or press and hold action is detected on

the grouped sensors (associated with the UP, DOWN, TAP, and PH status bits).

‘1’ (default) - The interrupt pin will asserted if a slide, tap, or press and hold event is detected on

the grouped sensors (associated with the UP, DOWN, TAP, and PH status bits).

Bit 6 - S7_INT_EN - Enables the interrupt pin to be asserted if a touch is detected on CS7 (associated

with the CS7 status bit).

‘0’ - The interrupt pin will not be asserted if a touch is detected on CS7 (associated with the CS7

status bit).

‘1’ (default) - The interrupt pin will be asserted is detected on CS7 (associated with the CS7 status

bit).

Bit 5 - S6_INT_EN - Enables the interrupt pin to be asserted if a touch is detected on CS6 (associated

with the CS6 status bit).

Bit 4 - S5_INT_EN - Enables the interrupt pin to be asserted if a touch is detected on CS5 (associated

with the CS5 status bit).

Bit 3 - S4_INT_EN - Enables the interrupt pin to be asserted if a touch is detected on CS4 (associated

with the CS4 status bit).

Bit 2 - S3_INT_EN - Enables the interrupt pin to be asserted if a touch is detected on CS3 (associated

with the CS3 status bit).

Bit 1 - S2_INT_EN - Enables the interrupt pin to be asserted if a touch is detected on CS2 (associated

with the CS2 status bit).

Bit 0 - S1_INT_EN - Enables the interrupt pin to be asserted if a touch is detected on CS1 (associated

with the CS1 status bit).

6.21.2 Interrupt Enable 2

These bits enable the interrupt pin to be asserted when the GPIOx status bit has been set.

Bit 7 - GPIO8_INT_EN - Enables the interrupt pin to be asserted if the GPIO8 status bit has been set.

‘0’ (default) - The interrupt pin will not be asserted if the GPIO8 status bit has been set.

‘1’ - The interrupt pin will be asserted if the GPIO8 status bit has been set.

Bit 6 - GPIO7_INT_EN - Enables the interrupt pin to be asserted if the GPIO7 status bit has been set.

Bit 5 - GPIO6_INT_EN - Enables the interrupt pin to be asserted if the GPIO6 status bit has been set.

Bit 4 - GPIO5_INT_EN - Enables the interrupt pin to be asserted if the GPIO5 status bit has been set.

Bit 3 - GPIO4_INT_EN - Enables the interrupt pin to be asserted if the GPIO4 status bit has been set.

Bit 2 - GPIO3_INT_EN - Enables the interrupt pin to be asserted if the GPIO3 status bit has been set.

Bit 1 - GPIO2_INT_EN - Enables the interrupt pin to be asserted if the GPIO2 status bit has been set.

Bit 0 - GPIO1_INT_EN - Enables the interrupt pin to be asserted if the GPIO1 status bit has been set.

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DATASHEET

6.22 Sleep Channel Control Register

The Sleep Channel Control Register determines which sensors are sampled when the device is placed

into the Sleep state.

APPLICATION NOTE: If this register is updated while the device is in the Sleep state, the conversion cycle may be

extended or for the first measurement of the new Capacitive Touch Sensors. It will correct

itself on subsequent measurement cycles.

APPLICATION NOTE: If this register is updated while the device is in the Sleep state, it is recommended to force

a recalibration routine on newly activated channels.

Bit 7 - GR_SLEEP - Enables the Grouped sensors to be sampled when the device is placed into the

Sleep state.

‘0’ (default) - Grouped Sensors are not sampled when the device is in the Sleep state.

‘1’ - The Grouped Sensors are sampled when the device is in Sleep mode. If a tap, slide, or touch

and hold is detected, the appropriate status bit is set and an interrupt generated. Individual sensors

will be enabled via the Group Sensor Enable register.

Bit 6 - S7_SLEEP - Enables the CS7 sensor to be sampled when the device is placed into sleep mode.

‘0’ (default) - The CS7 input is not sampled when the device is in the Sleep state

‘1’ - The CS7 input is sampled when the device is in Sleep mode. If a touch is detected, the status

bit is set and an interrupt generated.

Bit 5 - S6_SLEEP - Enables the CS6 sensor to be sampled when the device is placed into the Sleep

state.

Bit 4 - S5_SLEEP - Enables the CS5 sensor to be sampled when the device is placed into the Sleep

state.

Bit 3 - S4_SLEEP - Enables the CS4 sensor to be sampled when the device is placed into the Sleep

state.

Bit 2 - S3_SLEEP - Enables the CS3 sensor to be sampled when the device is placed into the Sleep

state.

Bit 1 - S2_SLEEP - Enables the CS2 sensor to be sampled when the device is placed into the Sleep

state.

Bit 0 - S1_SLEEP - Enables the CS1 sensor to be sampled when the device is placed into the Sleep

state.

Table 6.30 Sleep Channel Control Register

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

29h R/W Sleep Channel

Control

GR_

SLEEP

S7_

SLEEP

S6_

SLEEP

S5_

SLEEP

S4_

SLEEP

S3_

SLEEP

S2_

SLEEP

S1_

SLEEP 00h

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1214 61 Revision 1.0 (08-30-10)

DATASHEET

6.23 Multiple Touch Configuration Register

The Multiple Touch Configuration Register controls the settings for the multiple touch detection circuitry.

These settings determine the number of sensors associated with this detection and the CAP1214

device behavior.

Bit 7 - MULT_BLK_EN - Enables the multiple button blocking circuitry.

‘0’ - The multiple touch circuitry is disabled. The device will not block multiple touches.

‘1’ (default) - The multiple touch circuitry is enabled. The device will accept the number of touches

equal to programmed multiple touch threshold and block all others. It will remember which sensor

is valid and block all others until that sensor has been released.

Bits 3 - 2 - B_MULT_T[1:0] - Determines the number of simultaneous touches on all buttons (excluding

the Grouped buttons) before a Multiple Touch Event is flagged. If the number of multiple buttons

touches is greater than the threshold value, a Multiple Touch Event is flagged. The bit decode is given

by Ta b l e 6 . 3 2 .

Bits 1 - 0 - G_MULT_T[1:0] - Determines the number of simultaneous touches on all Grouped buttons

before a Multiple Touch Event is flagged. If the number of multiple buttons touches is greater than the

threshold value, a Multiple Touch Event is flagged. The bit decode is given by Table 6.33.

Table 6.31 Multiple Touch Configuration Register

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

2Ah R/W Multiple

Touch Config

MULT_

BLK_EN - - - B_MULT_T[1:0] G_MULT_T[1:0] 82h

Table 6.32 B_MULT_T Bit Decode

B_MULT_T[1:0]

NUMBER OF SIMULTANEOUS

TOUCHES10

0 0 1 (default)

01 2

10 3

11 4

Table 6.33 G_MULT_T Bit Decode

G_MULT_T[1:0]

NUMBER OF SIMULTANEOUS

TOUCHES10

00 2

01 3

1 0 4 (default)

11 1

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

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DATASHEET

6.24 Lid Closure Configuration Register

The Lid Closure Configuration Register controls the settings for the lid closure detection circuitry.

Bit 7 - LID_CLOSE - Enables the lid closure circuitry.

‘0’ (default) - The lid closure circuitry is disabled.

‘1’ The lid closure circuitry is enabled. The device will use the Lid Closure Status registers in

combination with the Lid Closure Pattern register settings to determine when a Lid Closure Event

is flagged. In addition, the Noise Status bits are associated with lid closure.

Bit 1 - COMP_PTRN - Determines how the Lid Closure Status registers are compared against the Lid

Closure Pattern registers. See Section 6.26 for details on how the Lid Closure Pattern registers are

used.

‘0’ (default) - The Lid Closure Status registers are not compared directly against the Lid Closure

Pattern registers. Instead, the number of bits in the Lid Closure Status registers is compared to the

number of bits in the Lid Closure Pattern registers to determine whether a Lid Closure Event is

flagged.

‘1’ - The Lid Closure Status registers are compared directly against the Lid Closure Pattern

registers. If the bits set in the Lid Closure Pattern are also set in the Lid Status registers, a Lid

Closure Event is flagged.

Bit 0 - LID_ALRT - Enables an interrupt if a Lid Closure Event occurs.

‘0’ (default) - If a Lid Closure Event occurs, the ALERT pin is not asserted.

‘1’ - If a Lid Closure Event occurs, the ALERT pin will be asserted.

6.25 Lid Closure Queue Control Register

The Lid Closure Queue Control Register determines the number of consecutive samples for which a

single sensor output is above the Lid Closure Threshold before it is flagged.

A value of 0000b is decoded as 1.

Bits 2 - 0 - QUEUE_L[2:0] - The number of consecutive samples from an individual sensor necessary

to set the Lid Closure status bit associated with the sensor. The queue applies individually to all

sensors (including both buttons and grouped sensors) and applies to setting and clearing the

respective status bit. The queue can range from 1 sample to 8 consecutive samples with a default of

2 consecutive samples.

Table 6.34 Lid Closure Configuration Register

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

2Bh R/W Lid Closure

Config

LID_

CLOSE -----

COMP_

PTRN

LID_

ALRT 00h

Table 6.35 Lid Closure Queue Control Register

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

2Ch R/W Lid Closure

Queue Control - - - - - QUEUE_L[2:0] 02h

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Datasheet

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DATASHEET

6.26 Lid Closure Pattern Registers

The Lid Closure Pattern Registers act as a pattern to identify an expected sensor profile that is

consistent with lid closure. They are only used when lid closure is enabled (see Section 6.24, "Lid

Closure Configuration Register"). There are two methods for how the Lid Closure Status Registers are

used with the Lid Closure Pattern registers: as specific sensors that must exceed the lid closure

threshold or as the number of sensors that must exceed the lid closure threshold. Which method is

used is based on bit 1 in the Lid Closure Configuration Register. The methods are described below. A

Lid Closure Event is flagged in the Group Status register (see Section 6.10, "Group Status Register").

1. Specific Sensors: If the bits set in the Lid Closure Pattern are also set in the Lid Status registers,

a Lid Closure Event is flagged.

2. Number of Sensors: The number of bits in the Lid Closure Status registers is compared to the

number of bits in the Lid Closure Pattern registers to determine whether a Lid Closure Event is

flagged. If any one of the conditions below is met, the Lid Closure Event is flagged.

If the number of bits in Lid Closure Status 1 register equals or exceeds the number of bits in

the Lid Closure Pattern 1 register, a Lid Closure Event is flagged. In other words, if the number

of simultaneous sensors 1-7 exceeding the lid closure threshold meets or exceeds the number

of bits in the Lid Closure Pattern 1 register, a Lid Closure Event is flagged.

If the number of bits in Lid Closure Status 2 register equals or exceeds the number of bits in

the Lid Closure Pattern 2 register, a Lid Closure Event is flagged. In other words, if the number

of simultaneous grouped sensors 8-14 exceeding the lid closure threshold meets or exceeds

the number of bits in the Lid Closure Pattern 2 register, a Lid Closure Event is flagged.

If the total number of bits in both the Lid Closure Status 1 and 2 registers equals or exceeds

the total number of bits in both the Lid Closure Pattern 1 and 2 registers, a Lid Closure Event

is flagged. In other words, if the total number of sensors above the lid closure threshold is

greater than or equal to the number of sensors required for both Lid Closure Patterns, a Lid

Closure Event is flagged.

A value of 00h in both registers will effectively disable the Lid Closure circuitry and clear the

LID status bit.

6.27 Recalibration Configuration Register

The Recalibration Configuration Register controls the automatic re-calibration routine settings as well

as advanced controls to program the Sensor Threshold register settings and interrupt behavior.

Table 6.36 Lid Closure Pattern Registers

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

2Dh R/W Lid Closure

Pattern 1 - S7_LM S6_LM S5_LM S4_LM S3_LM S2_LM S1_LM 7Fh

2Eh R/W Lid Closure

Pattern 2

S14_

S13_

S12_

S11_

S10_

LM S9_LM S8_LM 7Fh

Table 6.37 Recalibration Configuration Register

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

2Fh R/W Recalibration

Configuration

BUT_

LD_TH

GP_

LD_TH -NEG_DELTA_

CNT[1:0] CAL_CFG[2:0] 93h

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Datasheet

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DATASHEET

Bit 7 - BUT_LD_TH - Enables setting all button Sensor Threshold registers by writing to the Sensor 1

Threshold register.

‘0’ - Each Sensor X Threshold register is updated individually.

‘1’ (default) - Writing the Sensor 1 Threshold register will automatically overwrite the Sensor

Threshold registers for all buttons (Sensor Threshold 1 through Sensor Threshold 7). The individual

Sensor X Threshold registers (Sensor 2 Threshold through Sensor 7 Threshold) can be individually

updated at any time.

Bit 6 - GP_LD_TH - Enables setting the Group Threshold register by writing to the Sensor 1 Threshold

‘0’ (default) - The Group Threshold register is updated independently of the Sensor 1 Threshold

‘1’ - Writing the Sensor 1 Threshold register automatically overwrites the Group Threshold register

settings.

Bits 4 - 3 - NEG_DELTA_CNT[1:0] - Determines the number of negative delta counts necessary to

trigger a digital re-calibration as shown in Table 6.38.

Bits 2 - 0 - CAL_CFG[2:0] - Determines the update time and number of samples of the automatic re-

calibration routine. The settings apply to all sensors universally (though individual sensors and the

group can be configured to support re-calibration - see Section 6.19).

Table 6.38 NEG_DELTA_CNT Bit Decode

NEG_DELTA_CNT[1:0]

NUMBER OF CONSECUTIVE NEGATIVE DELTA

COUNT VALUES10

00 8

01 16

1 0 32 (default)

1 1 None (disabled)

Table 6.39 CAL_CFG Bit Decode

CAL_CFG[2:0] RECALIBRATION

SAMPLES (SEE

Note 6.1)

UPDATE TIME (SEE

Note 6.2)210

0 0 0 16 16

001 32 32

010 64 64

0 1 1 256 256 (default)

1 0 0 256 1024

1 0 1 256 2048

1 1 0 256 4096

1 1 1 256 7936

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Datasheet

SMSC CAP1214 65 Revision 1.0 (08-30-10)

DATASHEET

Note 6.1 Recalibration Samples refers to the number of samples that are measured and averaged

before the Base Count is updated.

Note 6.2 Update Time refers to the amount of time (in polling cycle periods) that elapses before the

Base Count is updated.

6.28 Sensor Threshold Registers

The Sensor Threshold Registers store the delta threshold that is used to determine if a touch has been

detected. When a touch occurs, the input signal of the corresponding sensor changes due to the

capacitance associated with a touch. If the sensor input change exceeds the threshold settings, a

touch is detected.

When the BUT_LD_TH bit is set (see Section 6.27 - bit 7), writing data to the Sensor 1 Threshold

When the GP_LD_TH bit is set (see Section 6.27 - bit 6), writing data to the Sensor 1 Threshold

Individual button registers and the Group Threshold register may be updated independently of the

Sensor 1 Threshold settings.

Table 6.40 Sensor Threshold Registers

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

30h R/W Sensor 1

Threshold -6432168421 40h

31h R/W Sensor 2

Threshold -6432168421 40h

32h R/W Sensor 3

Threshold -6432168421 40h

33h R/W Sensor 4

Threshold -6432168421 40h

34h R/W Sensor 5

Threshold -6432168421 40h

35h R/W Sensor 6

Threshold -6432168421 40h

36h R/W Sensor 7

Threshold -6432168421 40h

37h R/W Group

Threshold -6432168421 40h

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

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DATASHEET

6.29 Button Noise Threshold Registers

The Button Noise Threshold Registers control the value of a secondary internal threshold to detect

noise and improve the automatic recalibration routine. If a Capacitive Touch Sensor output exceeds

the Button Noise Threshold but does not exceed the sensor threshold, it is determined to be caused

by a noise spike. That sample is not used by the automatic re-calibration routine.

This feature can be disabled by setting the DIS_DIG_NOISE bit (see Section 6.14, "Configuration

The Button Noise Threshold is proportional to the programmed threshold as shown in Table 6.42.

6.29.1 Button Noise Threshold 1 Register

The Button Noise Threshold 1 Register controls the noise threshold for Capacitive Touch Sensors 1-4.

Bits 7-6 - CH4_BN_TH[1:0] - Controls the noise threshold for Capacitive Touch Sensor 4.

Bits 5-4 - CH3_BN_TH[1:0] - Controls the noise threshold for Capacitive Touch Sensor 3.

Bits 3-2 - CH2_BN_TH[1:0] - Controls the noise threshold for Capacitive Touch Sensor 2.

Bits 1-0 - CH1_BN_TH[1:0] - Controls the noise threshold for Capacitive Touch Sensor 1.

6.29.2 Button Noise Threshold 2 Register

The Button Noise Threshold 2 Register controls the noise threshold for Capacitive Touch Sensors 5 -

7 and the Grouped sensors.

Bits 7-6 - GR_BN_TH[1:0] - Controls the noise threshold for all grouped Capacitive Touch Sensors.

Bits 5-4 - CH7_BN_TH[1:0] - Controls the noise threshold for Capacitive Touch Sensor 7.

Bits 3-2 - CH6_BN_TH[1:0] - Controls the noise threshold for Capacitive Touch Sensor 6.

Bits 1-0 - CH5_BN_TH[1:0] - Controls the noise threshold for Capacitive Touch Sensor 5.

Table 6.41 Button Noise Threshold Registers

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

38h R/W Button Noise

Threshold 1

CS4_BN_TH

[1:0]

CS3_BN_TH

[1:0]

CS2_BN_TH

[1:0]

CS1_BN_TH

[1:0] AAh

39h R/W Button Noise

Threshold 2

GR_BN_TH

[1:0]

CS7_BN_TH

[1:0]

CS6_BN_TH

[1:0]

CS5_BN_TH

[1:0] AAh

Table 6.42 CSx_BN_TH Bit Decode

CSX_BN_TH[1:0]

THRESHOLD DIVIDE SETTING10

0 0 6.25%

0112.5%

1 0 25% (default)

1150%

Multiple Channel Capacitive Touch Sensor and LED Driver

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DATASHEET

6.30 Lid Closure Threshold Registers

The Lid Closure Threshold Registers control the value of a secondary internal threshold to detect noise

potentially generated by lid closure. If a Capacitive Touch Sensor output exceeds the Lid Closure

Threshold, the appropriate status bit is set in the Lid Closure Status register (see Section 6.8).

The Lid Closure Threshold is proportional to the programmed Sensor Threshold as shown in

Table 6.44.

6.30.1 Lid Closure Threshold 1 Register

The Lid Closure Threshold 1 Register controls the lid closure threshold for Capacitive Touch Sensors

1-4.

Bits 7-6 - CS4_LD_TH[1:0] - Controls the lid closure threshold for Capacitive Touch Sensor 4.

Bits 5-4 - CS3_LD_TH[1:0] - Controls the lid closure threshold for Capacitive Touch Sensor 3.

Bits 3-2 - CS2_LD_TH[1:0] - Controls the noise threshold for Capacitive Touch Sensor 2.

Bits 1-0 - CS1_LD_TH[1:0] - Controls the noise threshold for Capacitive Touch Sensor 1.

6.30.2 Lid Closure Threshold 2 Register

The Lid Closure Threshold 2 Register controls the lid closure threshold for Capacitive Touch Sensors

5 - 8.

Bits 7-6 - CS8_LD_TH[1:0] - Controls the lid closure threshold for Capacitive Touch Sensor 8 (one of

the grouped sensors).

Table 6.43 Lid Closure Threshold Registers

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

3Ah R/W Lid Closure

Threshold 1

CS4_LD_TH

[1:0]

CS3_LD_TH

[1:0]

CS2_LD_TH

[1:0]

CS1_LD_TH

[1:0] AAh

3Bh R/W Lid Closure

Threshold 2

CS8_LD_TH

[1:0]

CS7_LD_TH

[1:0]

CS6_LD_TH

[1:0]

CS5_LD_TH

[1:0] AAh

3Ch R/W Lid Closure

Threshold 3

CS12_LD_TH

[1:0]

CS11_LD_TH

[1:0]

CS10_LD_TH

[1:0]

CS9_LD_TH

[1:0] AAh

3Dh R/W Lid Closure

Threshold 4 ----

CS14_LD_TH

[1:0]

CS13_LD_TH

[1:0] 0Ah

Table 6.44 CSx_LD_TH Bit Decode

CSX_LD_TH[1:0]

THRESHOLD DIVIDE SETTING10

0 0 6.25%

0112.5%

1 0 25% (default)

1150%

Multiple Channel Capacitive Touch Sensor and LED Driver

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DATASHEET

Bits 5-4 - CS7_LD_TH[1:0] - Controls the lid closure threshold for Capacitive Touch Sensor 7.

Bits 3-2 - CS6_LD_TH[1:0] - Controls the lid closure threshold for Capacitive Touch Sensor 6.

Bits 1-0 - CS5_LD_TH[1:0] - Controls the lid closure threshold for Capacitive Touch Sensor 5.

6.30.3 Lid Closure Threshold 3 Register

The Lid Closure Threshold 3 Register controls the lid closure threshold for Capacitive Touch Sensors

9 - 12.

Bits 7-6 - CS12_LD_TH[1:0] - Controls the lid closure threshold for Capacitive Touch Sensor 12 (one

of the grouped sensors).

Bits 5-4 - CS11_LD_TH[1:0] - Controls the lid closure threshold for Capacitive Touch Sensor 11 (one

of the grouped sensors).

Bits 3-2 - CS10_LD_TH[1:0] - Controls the lid closure threshold for Capacitive Touch Sensor 10 (one

of the grouped sensors).

Bits 1-0 - CS9_LD_TH[1:0] - Controls the lid closure threshold for Capacitive Touch Sensor 9 (one of

the grouped sensors).

6.30.4 Lid Closure Threshold 4 Register

The Lid Closure Threshold 4 Register controls the lid closure threshold for Capacitive Touch Sensors

13 - 14.

Bits 3-2 - CS14_LD_TH[1:0] - Controls the lid closure threshold for Capacitive Touch Sensor 14 (one

of the grouped sensors).

Bits 1-0 - CS13_LD_TH[1:0] - Controls the lid closure threshold for Capacitive Touch Sensor 13 (one

of the grouped sensors).

6.31 Slider Velocity Configuration Register

The Slider Velocity Configuration Register controls the speed sensitive behaviors of the slider, allowing

the number of interrupts to be increased as the slide speed increases.

Bit 7 - ACC_INT_EN - Enables the device to generate extra interrupts after an accelerated slide has

been detected.

‘0’ - The device will not generate extra interrupts during or after the slide has been detected.

‘1’ (default) - The device will generate extra interrupts after an accelerated slide is detected. The

number of extra interrupts generated will be proportional to the speed of the accelerated slide but

will not exceed the maximum number of extra interrupts as determined by the MAX_INT bits.

Bits 6-4 - MAX_INT[2:0] - (default 100b) Determine the maximum number of extra interrupts that will

be generated after a single slide (regardless of length). The variable “T” is the actual slide time and

the parameter SLIDE_TIME is set by bits [3:2] of this register.

Table 6.45 Slider Velocity Configuration Register

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

3Eh R/W Slider Velocity

Configuration

ACC_

INT_EN MAX_INT[2:0] SLIDE_TIME

[1:0]

RPT_SCALE

[1:0] C5h

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DATASHEET

Bits 3-2 - SLIDE_TIME[1:0] - (default 01b) - Determines how fast a slide must be to generate extra

interrupts. This is the maximum slide time that will result in extra interrupts being generated. If the slide

time is greater than SLIDE_TIME, no extra interrupts will be generated.

Bits 1 - 0 - RPT_SCALE[1:0] - (default 01b) - Determines how much to increase the Repeat Rate

based on slide speed. The slide speed is determined by counting how many sensors are touched in

approximately 100msec. The Repeat Rate is then increased various amounts based on the

RPT_SCALE parameter.

When read in Ta b l e 6 . 4 8 , the repeat rate given is the number of measurement cycles between

interrupts generated.

Table 6.46 MAX_INT Bit Decode

MAX_INT[2:0]

MAX #

INTERRUPTS

# INTERRUPTS

FOR T < 1/2

SLIDE_TIME

# INTERRUPTS

FOR 1/2 < T <

3/4 SLIDE_TIME

# INTERRUPTS

FOR 3/4 < T <

FULL

SLIDE_TIME21 0

00 0 0 0 0 0

00 1 1 1 0 0

01 0 2 2 1 0

01 1 3 3 1 0

10 0 4 4 2 1

10 1 5 5 2 1

11 0 6 6 3 1

11 1 7 7 3 1

Table 6.47 SLIDE_TIME Bit Decode

SLIDE_TIME[1:0]

APPROXIMATE SLIDE TIME (MSEC)10

0 0 350

0 1 560 (default)

1 0 770

1 1 980

Table 6.48 RPT_SCALE Bit Decode

NUMBER OF SENSORS IN

100MSEC

REPEAT RATE (MSEC)

RPT_SCALE[1:0]

00 01 10 11

>=5 35 35 35 35

435353570

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Note 6.3 If the repeat rate for the slider is set at 105msec or lower, the 11b case will use the fixed

values of 140, 105 and 70msec, respectively.

6.32 Digital Recalibration Control Register

The Digital Recalibration Control Register forces channels to perform a digital calibration as if there

were no base count. When a bit is set, the corresponding Capacitive Touch Sensor will be re-calibrated

and the bit will be automatically cleared once the re-calibration routine has finished. This calibration

routine will update the base count for touch detection.

Bit 7 - GP_D_CAL - Forces the grouped sensors to perform a digital recalibration as if there were no

base count.

Bit 6 - CS7_D_CAL - Forces CS7 to perform a digital recalibration as if there were no base count.

Bit 5 - CS6_D_CAL - Forces CS6 to perform a digital recalibration as if there were no base count.

Bit 4 - CS5_D_CAL - Forces CS5 to perform a digital recalibration as if there were no base count.

Bit 3 - CS4_D_CAL - Forces CS4 to perform a digital recalibration as if there were no base count.

Bit 2 - CS3_D_CAL - Forces CS3 to perform a digital recalibration as if there were no base count.

Bit 1 - CS2_D_CAL - Forces CS2 to perform a digital recalibration as if there were no base count.

Bit 1 - CS1_D_CAL - Forces CS1 to perform a digital recalibration as if there were no base count.

6.33 Configuration 2 Register

3353570105

2 35 70 105 140

1 RPT_RATE_SL

Table 6.49 Digital Recalibration Control Register

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

3Fh R/W

Digital

Recalibration

Control

GP_

D_CAL

CS7_

D_CAL

CS6_

D_CAL

CS5_

D_CAL

CS4_

D_CAL

CS3_

D_CAL

CS2_

D_CAL

CS1_

D_CAL 00h

Table 6.50 Configuration 2 Register

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

40h R/W Configuration

INV_LINK_

TRAN -LED11_

CFG

BLK_

POL_

MIR

SHOW_

RF_

NOISE

DIS_

RF_

NOISE

VOL_

UP_

DOWN

INT_

REL_n 00h

Table 6.48 RPT_SCALE Bit Decode (continued)

NUMBER OF SENSORS IN

100MSEC

REPEAT RATE (MSEC)

RPT_SCALE[1:0]

00 01 10 11

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Bit 7 - INV_LINK_TRAN - Determines the behavior of the Linked LED Transition controls (see Section

6.48, "Linked LED Transition Control Registers").

‘0’ (default) - The Linked LED Transition controls set the min duty cycle equal to the max duty cycle.

‘1’ - The Linked LED Transition controls will invert the touch signal. For example, a touch signal

will be inverted to a non-touched signal.

Bit 5 - LED11_CFG - Determines whether LED11 base frequency is configurable.

‘0’ (default) - The PWM base frequency for the LED11 driver is set at ~2000Hz.

‘1’ - The PWM base frequency for the LED11 driver will be configured per settings in the LED11

Configuration Register (8Ah) (see Section 6.56, "LED11 Configuration Register").

Bit 4 - BLK_POL_MIR - Determines whether the LED Mirror Control register bits are linked to the LED

Polarity bits.

‘0’ (default) - When the LED Polarity controls are set, the corresponding LED Mirror control is

automatically set. Likewise, when the LED Polarity controls are cleared, the corresponding LED

Mirror control is cleared.

‘1’ - When the LED Polarity controls are changed, the corresponding LED Mirror control is not

automatically changed.

Bit 3 - SHOW_RF_NOISE - Determines whether the Noise Status bits will show RF Noise as the only

input source.

‘0’ (default) - The Noise Status registers will show both RF noise and low frequency noise if either

is detected on a Capacitive Touch Sensor channel.

‘1’ - The Noise Status registers will only show RF noise if it is detected on a Capacitive Touch

Sensor channel. Generic noise will still be detected and touches will be blocked normally; however,

the status bits will not be updated.

Bit 2 - DIS_RF_NOISE - Determines whether the RF noise filter is enabled. Setting this bit disables

the feature.

‘0’ (default) - If RF noise is detected by the analog block, the delta count on the corresponding

channel is set to 0. Note that this does not require that Noise Status bits be set.

‘1’ - A touch is not blocked even if RF noise is detected.

Bit 1 - VOL_UP_DOWN - Determines how the Grouped Sensors are to be used.

‘0’ (default) - The grouped sensors are used as a slider. All seven of the sensors are sampled

together and may disabled as a whole using the GP_EN (see Section 6.15) or GSLEEP (see

Section 6.22) controls or individually (using the Grouped Sensor Channel Enable register - see

Section 6.34). Alternately, each sensor may be disabled individually via the Group Sensor Channel

Enable register. They will use the Group Threshold settings for all touch detections.

‘1’ - The grouped sensors are used as separate sensors and are not grouped. They will behave

as follows:

1. Each sensor will flag individual interrupts when a touch is detected. They will set the

corresponding status bit in the Button Status 2 register.

2. The UP / DOWN, TAP, or PH status bits will not be set for CS9, CS10, CS11, CS12, or CS13.

No slide will be detected.

3. Each sensor will use the Group Threshold settings.

4. Each sensor can be individually enabled / disabled via the Grouped Sensor Enable register

settings.

5. All sensors except CS8 and CS14 will use the button queue controls and repeat rates.

6. The CS8 and CS14 sensors will use the tap and press and hold logic as well as the group

repeat rate settings.

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7. All sensors will use the group max duration settings if this feature is enabled via the

MAX_DUR_EN_G bit.

8. For CS8 and CS14, interrupts will be generated in the same way as they would be for a TAP

or Press and Hold event. This means that an interrupt will be generated on a touch. If the button

is held, interrupts will be generated at the Group Repeat rate until the button is released. These

buttons do not use the INT_REL_n control and will only generate an interrupt when a touch is

detected.

9. The CS8 sensor will be the designated “DOWN” button. When a tap or Press and Hold event

is detected, it will cause the DOWN status bit to be set. The TAP and PH status bits will be set

normally.

10. The CS14 sensor will be the designated “UP” button. When a Tap or Press and Hold event is

detected, it will cause the UP status bit to be set. The TAP and PH status bits will be set

normally.

Bit 0 - INT_REL_n - Controls the interrupt behavior when a release is detected on a button.

‘0’ (default) - An interrupt is generated when a press is detected and again when a release is

detected and at the repeat rate (if enabled - see Section 6.14 and Section 6.33).

‘1’ - An interrupt is generated when a press is detected and at the repeat rate (if enabled - see

Section 6.14 and Section 6.33).

6.34 Grouped Sensor Channel Enable Register

The Grouped Sensor Channel Enable Register enables sensors within Grouped Sensors to be

sampled during the polling cycle. This register may be updated at any time. If the grouped sensors are

treated as a group (see Section 6.33), then disabling one or more sensors will cause the slider to

behave erratically or not at all.

Bit 6 - CS14_EN - Enables the CS14 sensor to be sampled in the polling cycle.

Bit 5 - CS13_EN - Enables the CS13 sensor to be sampled in the polling cycle.

Bit 4 - CS12_EN - Enables the CS12 sensor to be sampled in the polling cycle.

Bit 3 - CS11_EN - Enables the CS11 sensor to be sampled in the polling cycle.

Bit 2 - CS10_EN - Enables the CS10 sensor to be sampled in the polling cycle.

Bit 1 - CS9_EN - Enables the CS9 sensor to be sampled in the polling cycle.

Bit 0 - CS8_EN - Enables the CS8 sensor to be sampled in the polling cycle.

Table 6.51 Grouped Sensor Channel Enable Register

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

41h R/W Grouped Sensor

Channel Enable -CS14_

CS13_

CS12_

CS11_

CS10_

CS9_

CS8_

EN 7Fh

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6.35 Proximity Control Register

The Proximity Control Register controls sensitivity settings for CS1.

Bit 7 - CS1_PROX - Determines the functionality of the CS1 channel.

‘0’ (default) - The CS1 channel is not measuring proximity. It will use the standard button queue

and data sensitivity controls. The Averaging will be set to a value of ‘1’. Writing to the

PROX_AVG[2:0] bits will change the averaging applied to CS1 (and only CS1).

‘1’ - The CS1 channel is measuring proximity. It will not use the queue. In addition, the CS1 channel

will not use the DELTA_SHIFT[2:0] sensitivity settings and will instead use the

PROX_D_SHIFT[2:0] settings. In Proximity mode, the signal is boosted by 8X to detect very small

capacitance changes.

Bit 6 - PROX_SUM - Determines whether the CS1 channel averaging will perform an average or

calculate the sum of the measured channel when comparing the delta count against the threshold.

‘0’ (default) - When configured to detect proximity, the CS1 channel delta counts will be the

average.

‘1’ - When configured to detect proximity, the CS1 channel will sum the results of the averages

rather than report the true average. This value will be compared against the threshold normally.

Note that this mode is intended for very small signal detection. Because the delta count is the

summation of several consecutive measurements, it may become very large. Adjustments to the

sensitivity and threshold values will be required to maintain proper operation.

Bits 5 - 3 - PROX_AVG[1:0] - Determines the averaging value used when CS1 is set to detect

proximity. When averaging is enabled (i.e. not set at a value of ‘1’), the CS1 sensor will be sampled

the average number of times consecutively during the same polling cycle. The delta counts are

summed and then divided by the number of averages to get an average delta which is compared

against the threshold normally.

This will increase the time of the polling cycle linearly with the number of averages taken. As the polling

cycle time is used to set the update rate, repeat rate, and recalibration times, these will likewise

increase. See Ta b le 6. 53 .

Note 6.4 The Polling time increase is based on the default sampling time as determined by the

Sampling Configuration register (see Section 6.37).

Table 6.52 Proximity Control Register

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

42h R/W Proximity

Control

CS1_

PROX

_SUM -PROX_AVG

[1:0] PROX_D_SENSE[2:0] 02h

Table 6.53 PROX_AVG Bit Decode

PROX_AVG[1:0]

NUMBER OF DIGITAL

AVERAGES

POLLING CYCLE TIME

INCREASE (SEE Note 6.4)10

0 0 16 (default) +38ms

0 1 32 +79ms

1 0 64 +161ms

1 1 128 +325ms

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Bits 2 - 0 - PROX_D_SENSE[2:0] - Controls the sensitivity of detecting proximity. The sensitivity

settings act to scale the relative delta count value higher or lower based on the system parameters. A

setting of 0000b is the most sensitive while a setting of 1111b is the least sensitive. At the more

sensitive settings, touches are detected for a smaller delta C corresponding to a “lighter” touch. These

settings are more sensitive to noise, however, and a noisy environment may flag more false touches

than less sensitive levels. See Table 6.17.

6.36 Sampling Channel Select Register

The Sampling Channel Select Register determines which (if any) Capacitive Sensor input is controlled

by the Sampling Configuration register.

Bit 7 - GR_S - Determines if all grouped sensors are controlled by the Sampling Configuration register

settings.

‘0’ (default) - The grouped sensors are not controlled by the Sampling Configuration register

settings. All Grouped sensors will be sampled in a 2.5ms window of the entire polling cycle (which

requires 35ms).

‘1’ - The grouped sensors are controlled by the Sampling Configuration register settings. Each

sensor sampling window will be determined based on these bit settings and the overall polling cycle

time will increase.

Bit 6 - CS7_S - Determines if Capacitive Touch Sensor 7 is controlled by the Sampling Configuration

Bit 5 - CS6_S - Determines if Capacitive Touch Sensor 6 is controlled by the Sampling Configuration

Bit 4 - CS5_S - Determines if Capacitive Touch Sensor 5 is controlled by the Sampling Configuration

Bit 3 - CS4_S - Determines if Capacitive Touch Sensor 4 is controlled by the Sampling Configuration

Bit 2 - CS3_S - Determines if Capacitive Touch Sensor 3 is controlled by the Sampling Configuration

Bit 1 - CS2_S - Determines if Capacitive Touch Sensor 2 is controlled by the Sampling Configuration

Bit 0 - CS1_S - Determines if Capacitive Touch Sensor 1 is controlled by the Sampling Configuration

Table 6.54 Sampling Channel Select Register

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

4Eh R/W Sampling

Channel Select GR_S CS7_S CS6_S CS5_S CS4_S CS3_S CS2_S CS1_S 00h

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6.37 Sampling Configuration Register

The Sampling Configuration Register controls the length of the sampling window of selected Capacitive

Touch Sensor channels as indicated in the Sampling Channel Select register.

Increasing the sampling window time will have two effects. The first effect will be to increase the

effective sensitivity of that particular channel so that a touch may be detected with a smaller ΔC.

However, at the larger sampling times, the resolution of the measurement is reduced.

The second effect will be increase the overall round robin rate (and all timing associated with the round

robin rate such as re-calibration times, repeat rate times, and maximum duration times).

All Capacitive Touch Sensors default to a sampling time of 2.5ms. Increasing the sampling time of any

single channel will increase the overall polling cycle by the same amount.

Bits 2 - 0 - OVERSAMP_RATE[2:0] - Determine the time to take a single sample. This setting applies

to all selected sensors.

6.38 Sensor Base Count Registers

Table 6.55 Sampling Configuration Register

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

4Fh R/W Sampling

Configuration -----OVERSAMP_RATE[2:0]00h

Table 6.56 OVERSAMP_RATE Bit Decode

OVERSAMP_RATE[2:0]

SENSOR SAMPLING

TIME210

10040ms

10120ms

11010ms

1115ms

0 0 0 2.5ms (default)

0011.28ms

0100.64ms

0110.32ms

Table 6.57 Sensor Base Count Registers

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

50h R Sensor 1 Base

Count 128 64 32 16 8 4 2 1 00h

51h R Sensor 2 Base

Count 128 64 32 16 8 4 2 1 00h

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The Sensor Base Count Registers store the calibrated “Not Touched” input value from the Capacitive

Touch Sensor inputs. These registers are periodically updated by the re-calibration routine.

The routine uses an internal adder to add the current count value for each reading to the sum of the

previous readings until sample size has been reached. At this point, the upper 16 bits are taken and

used as the Sensor Base Count. The internal adder is then reset and the re-calibration routine

continues.

The data presented is determined by the BASE_SHIFT bits (see Section 6.13).

6.39 LED Status Registers

52h R Sensor 3 Base

Count 128 64 32 16 8 4 2 1 00h

53h R Sensor 4 Base

Count 128 64 32 16 8 4 2 1 00h

54h R Sensor 5 Base

Count 128 64 32 16 8 4 2 1 00h

55h R Sensor 6 Base

Count 128 64 32 16 8 4 2 1 00h

56h R Sensor 7 Base

Count 128 64 32 16 8 4 2 1 00h

57h R Sensor 8 Base

Count 128 64 32 16 8 4 2 1 00h

58h R Sensor 9 Base

Count 128 64 32 16 8 4 2 1 00h

59h R Sensor 10

Base Count 128 64 32 16 8 4 2 1 00h

5Ah R Sensor 11

Base Count 128 64 32 16 8 4 2 1 00h

5Bh R Sensor 12

Base Count 128 64 32 16 8 4 2 1 00h

5Ch R Sensor 13

Base Count 128 64 32 16 8 4 2 1 00h

5Dh R Sensor 14

Base Count 128 64 32 16 8 4 2 1 00h

Table 6.58 LED Status Registers

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

60h R LED Status 1 LED8_

LED7_

LED6_

LED5_

LED4_

LED3_

LED2_

LED1_

DN 00h

61h R LED Status 2 - - - - - LED11_

LED10_

LED9_

DN 00h

Table 6.57 Sensor Base Count Registers (continued)

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

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The LED Status Registers indicate when an LED has completed its configured behavior (see Section

6.51, "LED Behavior Registers") after being actuated by the host (see Section 6.46, "LED Output

Control Registers"). These bits are ignored when the LED is linked to a capacitive sensor input. The

bits are cleared when the INT bit has been cleared. Likewise, these bits are cleared when the DSLEEP

bit is set.

6.39.1 LED Status 1

Bit 7 - LED8_DN - Indicates that LED8 has finished its behavior after being actuated by the host.

Bit 6 - LED7_DN - Indicates that LED7 has finished its behavior after being actuated by the host.

Bit 5 - LED6_DN - Indicates that LED6 has finished its behavior after being actuated by the host.

Bit 4 - LED5_DN - Indicates that LED5 has finished its behavior after being actuated by the host.

Bit 3 - LED4_DN - Indicates that LED4 has finished its behavior after being actuated by the host.

Bit 2 - LED3_DN - Indicates that LED3 has finished its behavior after being actuated by the host.

Bit 1 - LED2_DN - Indicates that LED2 has finished its behavior after being actuated by the host.

Bit 0 - LED1_DN - Indicates that LED1 has finished its behavior after being actuated by the host.

6.39.2 LED Status 2

Bit 2 - LED11_DN - Indicates that LED11 has finished its behavior after being actuated by the host.

Bit 1 - LED10_DN - Indicates that LED10 has finished its behavior after being actuated by the host.

Bit 0 - LED9_DN - Indicates that LED9 has finished its behavior after being actuated by the host.

6.40 Feedback Configuration Register

The Feedback Configuration Register controls the output of the FEEDBACK pin (see Section 5.7,

"FEEDBACK Pin").

APPLICATION NOTE: When linked to one or more sensors, the FEEDBACK pin will be activated when a touch is

detected. If the duration, frequency, or linking is changed while the FEEDBACK pin is active,

these changes will be applied the next time that the FEEDBACK pin is activated.

APPLICATION NOTE: If linked to one or more sensors and a second touch is detected while the FEEDBACK pin

is active, it will be restarted immediately without completing the current activity duration. Any

previously programmed setting changes are applied.

Bits 7-5 - FDBK_DUR[2:0] - Controls the duration of the FEEDBACK pin output (see Table 6.60).

Table 6.59 Feedback Configuration Register

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

62h R/W Feedback

Configuration FDBK_DUR[2:0] FDBK_FREQ[4:0] 00h

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Bits 4-0 - FDBK_FREQ[4:0] - Controls the frequency of the FEEDBACK pin output. The LSB

represents 125Hz. For example, a setting of 00100b (04d) represents a frequency of 500Hz (125Hz x

4 = 500Hz). The total range is from 125 Hz to 3875Hz.

A setting of 00000b uses DC, which will set the output full high for the specified duration.

6.41 Feedback Channel Configuration Registers

The Feedback Channel Configuration Registers control which sensors are linked to the FEEDBACK

pin (see Section 5.7, "FEEDBACK Pin").

6.41.1 Feedback Channel Configuration 1

For all bits in this register:

‘0’ (default) - The sensor input is not linked to the FEEDBACK pin.

‘1’ - The sensor is linked to the FEEDBACK pin and will assert the pin when a touch is detected.

Bit 6 - CS7_FDBK - Links the CS7 input to the FEEDBACK pin.

Bit 5 - CS6_FDBK - Links the CS6 input to the FEEDBACK pin.

Bit 4 - CS5_FDBK - Links the CS5 input to the FEEDBACK pin.

Table 6.60 FDBK_DUR Bit Decode

FDBK_DUR[2:0]

DURATION210

0 0 0 0 (disabled) (default)

001 8ms

010 16ms

011 32ms

100 64ms

1 0 1 128ms

1 1 0 256ms

1 1 1 while button is pressed

Table 6.61 Feedback Channel Configuration Registers

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

63h R/W

Feedback

Channel

Configuration 1

-CS7_

FDBK

CS6_

FDBK

CS5_

FDBK

CS4_

FDBK

CS3_

FDBK

CS2_

FDBK

CS1_

FDBK 00h

64h R/W

Feedback

Channel

Configuration 2

-CS14_

FDBK

CS13_

FDBK

CS12_

FDBK

CS11_

FDBK

CS10_

FDBK

CS9_

FDBK

CS8_

FDBK 00h

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Bit 3 - CS4_FDBK - Links the CS4 input to the FEEDBACK pin.

Bit 2 - CS3_FDBK - Links the CS3 input to the FEEDBACK pin.

Bit 1 - CS2_FDBK - Links the CS2 input to the FEEDBACK pin.

Bit 0 - CS1_FDBK - Links the CS1 input to the FEEDBACK pin.

6.41.2 Feedback Channel Configuration 2

For all bits in this register:

‘0’ (default) - The sensor input is not linked to the FEEDBACK pin.

‘1’ - The sensor is linked to the FEEDBACK pin and will assert the pin when a touch is detected.

Bit 6 - CS14_FDBK - Links the CS14 input to the FEEDBACK pin.

Bit 5 - CS13_FDBK - Links the CS13 input to the FEEDBACK pin.

Bit 4 - CS12_FDBK - Links the CS12 input to the FEEDBACK pin.

Bit 3 - CS11_FDBK - Links the CS11 input to the FEEDBACK pin.

Bit 2 - CS10_FDBK - Links the CS10 input to the FEEDBACK pin.

Bit 1 - CS9_FDBK - Links the CS9 input to the FEEDBACK pin.

Bit 0 - CS8_FDBK - Links the CS8 input to the FEEDBACK pin.

6.42 Feedback One-Shot Register

The Feedback One-Shot Register allows the application to notify the CAP1214 to assert the

FEEDBACK pin (see Section 5.7, "FEEDBACK Pin"). This register is self-clearing.

APPLICATION NOTE: If the FDBK_DUR[2:0] settings are set at either ‘000b’ or ‘111b’, this one-shot will not

function.

6.43 LED / GPIO Direction Register

The LED / GPIO Direction Register controls the data flow direction for the LED / GPIO pins. Each pin

is controlled by a single bit.

Table 6.62 Feedback One-Shot Register

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

65h R/W Feedback

One-Shot

Writing to this register asserts the FEEDBACK pin for the configured duration

at the configured frequency. 00h

Table 6.63 LED / GPIO Direction Register

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

70h R/W LED / GPIO

Direction

LED8_

DIR

LED7_

DIR

LED6_

DIR

LED5_

DIR

LED4_

DIR

LED3_

DIR

LED2_

DIR

LED1_

DIR 00h

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Bit 7 - LED8_DIR - Controls the direction of the LED8 / GPIO8 pin.

‘0’ (default) - The LED8 / GPIO8 pin is configured as an input and cannot be used to drive an LED.

‘1’ - The LED8 / GPIO8 pin is configured as an output.

Bit 6 - LED7_DIR - Controls the direction of the LED7 / GPIO7 pin.

Bit 5 - LED6_DIR - Controls the direction of the LED6 / GPIO6 pin.

Bit 4 - LED5_DIR - Controls the direction of the LED5 / GPIO5 pin.

Bit 3 - LED4_DIR - Controls the direction of the LED4 / GPIO4 pin.

Bit 2 - LED3_DIR - Controls the direction of the LED3 / GPIO3 pin.

Bit 1 - LED2_DIR - Controls the direction of the LED2 / GPIO2 pin.

Bit 0 - LED1_DIR - Controls the direction of the LED1 / GPIO1 pin.

6.44 LED / GPIO Output Type Register

The LED / GPIO Output Type Register controls the type of output for the LEDx / GPIOx pins that are

configured to operate as outputs. Each pin is controlled by a single bit.

Bit 7 - LED8_OT - Determines the output type of LED8.

‘0’ (default) - The LED8 / GPIO8 pin is an open-drain output with an external pull-up resistor. When

the appropriate bit is set to the “active” state (logic ‘1’), the pin will be driven low. Conversely, when

the bit is set to the “inactive” state (logic ‘0’), the pin will be left in a high-Z state and pulled high

via an external pull-up resistor.

‘1’ - The LEDx / GPIO8 pin is a push-pull output. When driving a logic ‘1’, the pin is driven high.

When driving a logic ‘0’, the pin is driven low.

Bit 6 - LED7_OT - Determines the output type of LED7.

Bit 5 - LED6_OT - Determines the output type of LED6.

Bit 4 - LED5_OT - Determines the output type of LED5.

Bit 3 - LED4_OT - Determines the output type of LED4.

Bit 2 - LED3_OT - Determines the output type of LED3.

Bit 1 - LED2_OT - Determines the output type of LED2.

Bit 0 - LED1_OT - Determines the output type of LED1.

Table 6.64 LED / GPIO Output Type Register

ADDRR/WREGISTERB7 B6B5B4B3B2B1B0DEFAULT

71h R/W LED / GPIO

Output Type

LED8_

LED7_

LED6_

LED5_

LED4_

LED3_

LED2_

LED1_

OT 00h

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

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DATASHEET

6.45 GPIO Input Register

The GPIO Input Register reflects the state of the LEDx / GPIOx pins. These bits are updated whenever

the pin state changes regardless of the operation of the pin. If a LEDx / GPIOx pin is configured as

an input (see Section 6.40), when a pin changes states, the GPIOx_STS bit is set. If the corresponding

interrupt enable bit is also set, an interrupt will be asserted.

6.46 LED Output Control Registers

The LED Output Control Registers control the output state of the LED pins when they are configured

as outputs (see Section 6.43, "LED / GPIO Direction Register") and are not linked to sensor inputs

(see Section 6.50, "Sensor LED Linking Register"). When these bits are set, the drive of the pin is

determined by the output type and the polarity controls (see Section 6.44, "LED / GPIO Output Type

The LED Polarity Control register will determine the non actuated state of the LED pins. The actuated

LED behavior is determined by the LED behavior controls (see Section 6.51, "LED Behavior

Registers").

6.46.1 LED Output Control 1

Bit 7 - LED8_DR - Determines whether the LED8 output is driven high or low. This LED cannot be

linked to a Capacitive Touch Sensor.

‘0’ (default) - The LED8 output is driven at the minimum duty cycle or is not actuated.

‘1’ - The LED8 output is high-Z or driven at the maximum duty cycle or is actuated.

Bit 6 - LED7_DR - Determines whether LED7 output is driven high or low.

Bit 5 - LED6_DR - Determines whether LED6 output is driven high or low.

Bit 4 - LED5_DR - Determines whether LED5 output is driven high or low.

Bit 3 - LED4_DR - Determines whether LED4 output is driven high or low.

Bit 2 - LED3_DR - Determines whether LED3 output is driven high or low.

Bit 1 - LED2_DR - Determines whether LED2 output is driven high or low.

Bit 0 - LED1_DR - Determines whether LED1 output is driven high or low.

Table 6.65 GPIO Input Register

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

72h R GPIO Input GPIO8 GPIO7 GPIO6 GPIO5 GPIO4 GPIO3 GPIO2 GPIO1 00h

Table 6.66 LED Output Control Registers

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

73h R/W LED Output

Control 1

LED8_

LED7_

LED6_

LED5_

LED4_

LED3_

LED2_

LED1_

DR 00h

74h R/W LED Output

Control 2

LED11_

LED10_

LED9_

DR 00h

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

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DATASHEET

6.46.2 LED Output Control 2

Bit 2 - LED11_DR - Determines whether LED11 is driven high or low. This LED cannot be linked to a

Capacitive Touch Sensor.

‘0’ (default) - The LED11 output is driven at the minimum duty cycle or is not actuated

‘1’ - The LED11 output is high-Z or driven at the maximum duty cycle or is actuated.

Bit 1 - LED10_DR - Determines whether LED10 is driven high or low. If this LED is linked to the Group

of sensors, LED9 is automatically linked to the Group if sensors.

Bit 0 - LED9_DR - Determines whether LED9 is driven high or low.

6.47 LED Polarity Registers

The LED Polarity Registers control the logical polarity of the LED outputs. When these bits are set or

cleared, the corresponding LED Mirror controls are also set or cleared (unless the BLK_POL_MIR bit

is set - see Section 6.33). Table 6.68, "LED Polarity Behavior" shows the interaction between the

polarity controls, output controls, and relative brightness.

APPLICATION NOTE: The polarity controls determine the final LED pin drive. A touch on a linked Capacitive Touch

Sensor is treated in the same way as the LED Output Control bit being set to a logic ‘1’.

APPLICATION NOTE: The LED drive assumes that the LEDs are configured such that if the LED pin is driven to

a logic ‘0’, the LED will be on and the CAP1214 LED pin is sinking the LED current.

Conversely, if the LED pin is driven to a logic ‘1’, the LED will be off and there is no current

flow. See Figure 5.1, "System Diagram for CAP1214".

APPLICATION NOTE: This application note applies when the LED polarity is inverted (LEDx_POL = ‘0’). For LED

operation, the duty cycle settings determine the % of time that the LED pin will be driven to

a logic ‘0’ state in an inverted system. The Max Duty Cycle settings define the maximum %

of time that the LED pin will be driven low (i.e. maximum % of time that the LED is on) while

the Min Duty Cycle settings determine the minimum % of time that the LED pin will be driven

low (i.e. minimum % of time that the LED is on). When there is no touch detected or the

LED Output Control register bit is at a logic ‘0’, the LED output will be driven at the minimum

duty cycle setting. Breathe operations will ramp the duty cycle from the minimum duty cycle

to the maximum duty cycle.

APPLICATION NOTE: This application note applies when the LED polarity is non-inverted (LEDx_POL = ‘1’). For

LED operation, the duty cycle settings determine the % of time that the LED pin will be driven

to a logic ‘1’ state in a non-inverted system. The Max Duty Cycle settings define the

maximum % of time that the LED pin will be driven high (i.e. maximum % of time that the

LED is off) while the Min Duty Cycle settings determine the minimum % of time that the LED

pin will be driven high (i.e. minimum % of time that the LED is off). When there is no touch

detected or the LED Output Control register bit is at a logic ‘0’, the LED output will be driven

at 100 minus the minimum duty cycle setting. Breathe operations will ramp the duty cycle

from 100 minus the minimum duty cycle to 100 minus the maximum duty cycle.

Table 6.67 LED Polarity Registers

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

75h R/W LED Polarity

LED8_

POL

LED7_

POL

LED6_

POL

LED5_

POL

LED4_

POL

LED3_

POL

LED2_

POL

LED1_

POL 00h

76h R/W LED Polarity

2-----

LED11_

POL

LED10_

POL

LED9_

POL 00h

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

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DATASHEET

APPLICATION NOTE: The LED Mirror controls (see Section 6.49, "LED Mirror Control") work with the polarity

controls with respect to LED brightness but will not have a direct effect on the output pin

drive.

6.47.1 LED Polarity 1

Bit 7 - LED8_POL - Determines the polarity of the LED8 output.

‘0’ - The LED8 output is inverted. For example, a setting of ‘1’ in the LED 8 Output register will

cause the LED pin output to be driven to a logic ‘0’.

‘1’ - The LED8 output is non-inverted. For example, a setting of ‘1’ in the LED 8 Output register

will cause the LED pin output to be driven to a logic ‘1’ or left in the high-Z state as determined by

its output type.

Bit 6 - LED7_POL - Determines the polarity of the LED7 output.

Bit 5 - LED6_POL - Determines the polarity of the LED6 output.

Bit 4 - LED5_POL - Determines the polarity of the LED5 output.

Bit 3 - LED4_POL - Determines the polarity of the LED4 output.

Bit 2 - LED3_POL - Determines the polarity of the LED3 output.

Bit 1 - LED2_POL - Determines the polarity of the LED2 output.

Bit 0 - LED1_POL - Determines the polarity of the LED1 output.

Table 6.68 LED Polarity Behavior

LED

OUTPUT

CONTROL

LED

APPEARANCE

0inverted

(‘0’) not used

minimum %

of time that

the LED is on

(logic 0)

maximum brightness at min

duty cycle

on at min duty

cycle

1inverted

(‘0’)

maximum %

of time that

the LED is on

(logic 0)

minimum %

of time that

the LED is on

(logic 0)

maximum brightness at max

duty cycle. Brightness ramps

from min duty cycle to max duty

cycle.

according to

LED behavior

non-

inverted

(‘1’)

not used

minimum %

of time that

the LED is off

(logic 1)

maximum brightness at 100

minus min duty cycle

on at 100 - min

duty cycle

non-

inverted

(‘1’)

maximum %

of time that

the LED is off

(logic 1)

minimum %

of time that

the LED is off

(logic 1)

For Direct behavior, maximum

brightness is 100 minus max

duty cycle. When breathing,

max brightness is 100 minus

min duty cycle. Brightness

ramps from 100 - min duty

cycle to 100 - max duty cycle.

according to

LED behavior

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

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DATASHEET

6.47.2 LED Polarity 2

Bit 2 - LED11_POL - Determines the polarity of the LED11 output.

Bit 1 - LED10_POL - Determines the polarity of the LED10 output.

Bit 0 - LED9_POL - Determines the polarity of the LED9 output.

6.48 Linked LED Transition Control Registers

The Linked LED Transition Control Registers control the LED drive when the LED is linked to a

Capacitive Touch sensor. These controls work in conjunction INV_LINK_TRAN bit (see Section 6.33,

"Configuration 2 Register") to create smooth transitions from host control to linked LEDs.

6.48.1 Linked LED Transition Control 1 - 77h

Bit 6 - LED7_LTRAN - Determines the transition effect when LED7 is linked to CS7.

‘0’ (default) - When the LED output control bit for CS7 is ‘1’, and then CS7 is linked to LED7 and

no touch is detected, the LED will change states.

‘1’ - If the INV_LINK_TRAN bit is ‘1’, when the LED output control bit for CS7 is ‘1’, and then CS7

is linked to LED7 and no touch is detected, the LED will not change states. In addition, the LED

state will change when the sensor is touched. If the INV_LINK_TRAN bit is ‘0’, when the LED

output control bit for CS7 is ‘1’, and then CS7 is linked to LED7 and no touch is detected, the LED

will not change states. However, the LED state will not change when the sensor is touched.

APPLICATION NOTE: If the LED behavior is not “Direct” and the INV_LINK_TRAN bit it ‘0’, the LED will not perform

as expected when the LED7_LTRAN bit is set to ‘1’. Therefore, if breathe and pulse

behaviors are used, set the INV_LINK_TRAN bit to ‘1’.

Bit 5 - LED6_LTRAN - Determines the transition effect when LED6 is linked to CS6.

Bit 4 - LED5_LTRAN - Determines the transition effect when LED5 is linked to CS5.

Bit 3 - LED4_LTRAN - Determines the transition effect when LED4 is linked to CS4.

Bit 2 - LED3_LTRAN - Determines the transition effect when LED3 is linked to CS3.

Bit 1 - LED2_LTRAN - Determines the transition effect when LED2 is linked to CS2.

Bit 0 - LED1_LTRAN - Determines the transition effect when LED1 is linked to CS1.

6.48.2 Linked LED Transition Control 2 - 78h

Bit 1 - LED10_LTRAN - Determines the transition effect when LED10 is linked to the Grouped Sensors.

Bit 0 - LED9_LTRAN - Determines the transition effect when LED9 is linked to the Grouped Sensors.

Table 6.69 Linked LED Transition Control Registers

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

77h R/W Linked LED

Transition Control 1 -LED7_

LTRAN

LED6_

LTRAN

LED5_

LTRAN

LED4_

LTRAN

LED3_

LTRAN

LED2_

LTRAN

LED1_

LTRAN 00h

78h R/W Linked LED

Transition Control 2 ------

LED10_

LTRAN

LED9_

LTRAN 00h

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

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DATASHEET

6.49 LED Mirror Control

The LED Mirror Control Registers determine the meaning of duty cycle settings when polarity is non-

inverted for each LED channel. When the polarity bit is set to ‘1’ (non-inverted), to obtain correct steps

for LED ramping, pulse, and breathe behaviors, the min and max duty cycles need to be relative to

100%, rather than the default, which is relative to 0%.

APPLICATION NOTE: The LED drive assumes that the LEDs are configured such that if the LED pin is driven to

a logic ‘0’, the LED will be on and the CAP1214 LED pin is sinking the LED current. When

the polarity bit is set to ‘1’, it is considered non-inverted. For systems using the opposite LED

configuration, mirror controls would apply when the polarity bit is ‘0’.

These bits are changed automatically if the corresponding LED Polarity bit is changed (unless the

BLK_POL_MIR bit is set - see Section 6.33).

6.49.1 LED Mirror Control 1 - 79h

Bit 7 - LED8_MIR_EN - Determines whether the duty cycle settings are “biased” relative to 0% or 100%

duty cycle.

‘0’ (default) - The duty cycle settings are determined relative to 0% and are determined directly with

the settings.

‘1’ - The duty cycle settings are determined relative to 100%.

Bit 6 - LED7_MIR_EN - Determines whether the duty cycle settings are “biased” relative to 0% or 100%

duty cycle.

Bit 5 - LED6_MIR_EN - Determines whether the duty cycle settings are “biased” relative to 0% or 100%

duty cycle.

Bit 4 - LED5_MIR_EN - Determines whether the duty cycle settings are “biased” relative to 0% or 100%

duty cycle.

Bit 3 - LED4_MIR_EN - Determines whether the duty cycle settings are “biased” relative to 0% or 100%

duty cycle.

Bit 2 - LED3_MIR_EN - Determines whether the duty cycle settings are “biased” relative to 0% or 100%

duty cycle.

Bit 1 - LED2_MIR_EN - Determines whether the duty cycle settings are “biased” relative to 0% or 100%

duty cycle.

Bit 0 - LED1_MIR_EN - Determines whether the duty cycle settings are “biased” relative to 0% or 100%

duty cycle.

Table 6.70 LED Mirror Control Registers

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

79h R/W LED Mirror

Control 1

LED8_

MIR _

LED7_

MIR _

LED6_

MIR _

LED5_

MIR _

LED4_

MIR _

LED3_

MIR _

LED2_

MIR _

LED1_

MIR _

00h

7Ah R/W LED Mirror

Control 2 -----

LED11_

MIR _

LED10_

MIR _

LED9_

MIR _

00h

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

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DATASHEET

6.49.2 LED Mirror Control 2 - 7Ah

Bit 2 - LED11_MIR_EN - Determines whether the duty cycle settings are “biased” relative to 0% or

100% duty cycle.

Bit 1 - LED10_MIR_EN - Determines whether the duty cycle settings are “biased” relative to 0% or

100% duty cycle.

Bit 0 - LED9_MIR_EN - Determines whether the duty cycle settings are “biased” relative to 0% or 100%

duty cycle.

6.50 Sensor LED Linking Register

The Sensor LED Linking Register controls whether a Capacitive Touch Sensor is linked to an LED

output. If the corresponding bit is set, the appropriate LED output will change states defined by the

LED Behavior controls (see Section 6.51, "LED Behavior Registers") in response to the Capacitive

Touch sensor.

If the LED channel is configured as an input, the corresponding Sensor LED Linking bit is ignored.

Bit 7 - UP_DOWN_LINK - Links the LED10 output to a detected UP condition on the group including

a slide in the “up” direction, a tap on the “up” side of the group or a press and hold condition on the

“up” side of the group. The LED10 driver will be actuated and will behave as determined by the

LED10_CTL bits. This bit also links the LED9 output to a detected DOWN condition on the group

including a slide in the “down” direction, a tap on the “down” side of the group or a press and hold

condition on the “down” side of the group. The LED9 driver will be actuated and will behave as

determined by the LED9_CTL bits.

LED9 and LED10 will not be active simultaneously. If LED9 is actuated by detecting a slide, tap, or

press and hold event, LED10 will be inactive. Likewise, if LED10 is actuated by detecting a slide, tap,

or press and hold event, LED9 will be inactive.

Bit 6 - CS7_LED7 - Links the LED7 output to a detected touch on the CS7 sensor. When a touch is

detected, the LED is actuated and will behave as determined by the LED Behavior controls.

‘0’ - The LED7 output is not associated with the CS7 input. If a touch is detected on the CS7 input,

the LED will not automatically be actuated. The LED is enabled and controlled via the LED Output

Configuration register (see Section 6.46) and the LED Behavior registers (see Section 6.51).

‘1’ - The LED 7 output is associated with the CS7 input. If a touch is detected on the CS7 input,

the LED will be actuated and behave as defined in Table 6.73. Furthermore, the LED will

automatically be enabled.

Bit 5 - CS6_LED6 - Links the LED6 output to a detected touch on the CS6 sensor. When a touch is

detected, the LED is actuated and will behave as determined by the LED Behavior controls.

Bit 4 - CS5_LED5 - Links the LED5 output to a detected touch on the CS5 sensor. When a touch is

detected, the LED is actuated and will behave as determined by the LED Behavior controls.

Bit 4 - CS4_LED4 - Links the LED4 output to a detected touch on the CS4 sensor. When a touch is

detected, the LED is actuated and will behave as determined by the LED Behavior controls.

Table 6.71 Sensor LED Linking Register

ADDRR/WREGISTER B7 B6B5B4B3B2B1B0DEFAULT

80h R/W Sensor LED

Linking

UP_

DOWN _

LINK

CS7_

LED7

CS6_

LED6

CS5_

LED5

CS4_

LED4

CS3_

LED3

CS2_

LED2

CS1_

LED1 00h

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

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DATASHEET

Bit 2 - CS3_LED3 - Links the LED3 output to a detected touch on the CS3 sensor. When a touch is

detected, the LED is actuated and will behave as determined by the LED Behavior controls.

Bit 1 - CS2_LED2 - Links the LED2 output to a detected touch on the CS2 sensor. When a touch is

detected, the LED is actuated and will behave as determined by the LED Behavior controls.

Bit 0 - CS1_LED1 - Links the LED1 output to a detected touch on the CS1 sensor. When a touch is

detected, the LED is actuated and will behave as determined by the LED Behavior controls.

6.51 LED Behavior Registers

The LED Behavior Registers control the operation of LEDs. Each LEDx / GPIOx pin is controlled by a

2-bit field. If the LEDx / GPIOx pin is configured as an input, these bits are ignored.

If the corresponding LED output is linked to a Capacitive Touch Sensor, the appropriate behavior will

be enabled / disabled based on touches and releases.

If the LED output is not associated with a Capacitive Touch Sensor, the appropriate behavior will be

enabled / disabled by the LED Output Control register. If the respective LEDx_DR bit is set to a logic

‘1’, this will be associated as a “touch”, and if the LEDx_DR bit is set to a logic ‘0’, this will be

associated as a “release”.

Table 6.73 shows the behavior triggers. The defined behavior will activate when the Start Trigger is

met and will stop when the Stop Trigger is met. Note the behavior of the Breathe Hold and Pulse

Release option.

The LED Polarity Control register will determine the non actuated state of the LED outputs (see Section

6.47, "LED Polarity Registers").

APPLICATION NOTE: If an LED is not linked to a Capacitive Touch Sensor and is breathing (via the Breathe or

Pulse behaviors), it must be unactuated before any changes to behavior are processed.

APPLICATION NOTE: If an LED is not linked to the Capacitive Touch Sensor and configured to operate using Pulse

1 Behavior, the circuitry will only be actuated when the corresponding bit is set. It will not

check the bit condition until the Pulse 1 behavior is finished. The device will not remember

if the bit was cleared and reset while it was actuated.

APPLICATION NOTE: If an LED is actuated and it is switched from linked to a Capacitive Touch Sensor to unlinked

(or vice versa), the LED will respond to the new command source immediately if the behavior

was Direct or Breathe. For Pulse behaviors, it will complete the behavior already in progress.

For example, if a linked LED was actuated by a touch and the control is changed so that it

is unlinked, it will check the status of the corresponding LED Output Control bit. If that bit is

‘0’, the LED will behave as if a release was detected. Likewise, if an unlinked LED was

actuated by the LED Output Control register and the control is changed so that it is linked

and no touch is detected, the LED will behave as if a release was detected.

6.51.1 LED Behavior 1 - 81h

Bits 7 - 6 - LED4_CTL[1:0] - Determines the behavior of LED4 / GPIO4 when configured to operate

as an LED output.

Table 6.72 LED Behavior Registers

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

81h R/W LED Behavior 1 LED4_CTL[1:0] LED3_CTL[1:0] LED2_CTL[1:0] LED1_CTL[1:0] 00h

82h R/W LED Behavior 2 LED8_CTL[1:0] LED7_CTL[1:0] LED6_CTL[1:0] LED5_CTL[1:0] 00h

83h R/W LED Behavior 3 LED11_ALT [1:0] LED11_CTL [1:0] LED10_CTL [1:0] LED9_CTL[1:0] 00h

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.0 (08-30-10) 88 SMSC CAP1214

DATASHEET

Bits 5 - 4 - LED3_CTL[1:0] - Determines the behavior of LED3 / GPIO3 when configured to operate

as an LED output.

Bits 3 - 2 - LED2_CTL[1:0] - Determines the behavior of LED2 / GPIO2 when configured to operate

as an LED output.

Bits 1 - 0 - LED1_CTL[1:0] - Determines the behavior of LED1 / GPIO1 when configured to operate

as an LED output.

6.51.2 LED Behavior 2 - 82h

Bits 7 - 6 - LED8_CTL[1:0] - Determines the behavior of LED8 / GPIO8 when configured to operate

as an LED output.

Bits 5 - 4 - LED7_CTL[1:0] - Determines the behavior of LED7 / GPIO7 when configured to operate

as an LED output.

Bits 3 - 2 - LED6_CTL[1:0] - Determines the behavior of LED6 / GPIO6 when configured to operate

as an LED output.

Bits 1 - 0 - LED5_CTL[1:0] - Determines the behavior of LED5 / GPIO5 when configured to operate

as an LED output.

6.51.3 LED Behavior 3 - 83h

Bits 7 - 6 - LED11_ALT[1:0] - Determines the behavior of LED11 when the PWR_LED bit is set and

either the SLEEP or DSLEEP bits are set (see Section 6.1).

Bits 5 - 4 - LED11_CTL[1:0] - Determines the behavior of LED11 when the PWR_LED bit is set and

both the SLEEP and DSLEEP bits are not set (see Section 6.1). It also determines the behavior when

the LED is driven by setting bit 2 LED11_DR in the LED Output Control 2 Register (74h).

Bits 3 - 2 - LED10_CTL[1:0] - Determines the behavior of LED10.

Bits 1 - 0 - LED9_CTL[1:0] - Determines the behavior of LED9.

APPLICATION NOTE: When driving the LED / GPIOx output as a GPO, the LEDx_CTL[1:0] bits should be set to

00b.

Table 6.73 LEDx_CTL Bit Decode

LEDX_CTL

[1:0]

OPERATION DESCRIPTION

START

TRIGGER

STOP

TRIGGER10

0 0 Direct The LED is driven to the programmed state

(active or inactive). See Figure 6.7

Touch Detected

or LED Output

Control bit set

Release

Detected or

LED Output

Control bit

cleared

01 Pulse 1

The LED will “Pulse” a programmed

number of times. During each “Pulse” the

LED will breathe up to the maximum

brightness and back down to the minimum

brightness so that the total “Pulse” period

matches the programmed value.

Touch or

Release

Detected or LED

Output Control

bit set or cleared

(see

Section 6.52)

n/a

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1214 89 Revision 1.0 (08-30-10)

DATASHEET

APPLICATION NOTE: The PWM frequency is determined based on the selected LED behavior, the programmed

breathe period, and the programmed min and max duty cycles. For the Direct behavior

mode, the PWM frequency is calculated based on the programmed Rise and Fall times. If

these are set at 0, the maximum PWM frequency will be used based on the programmed

duty cycle settings.

6.52 LED Pulse 1 Period Register

The LED Pulse 1 Period Register determines the overall period of a pulse operation as determined by

the LED_CTL registers (see Table 6.73 - setting 01b). Each LSB represents 32ms so that a setting of

20h (32d) would represent a period of 1024ms (32ms x 32 = 1024ms). The total range is from 32ms

to 4.06 seconds as shown in Ta b l e 6 . 7 5 .

The number of pulses is programmable as determined by the PULSE1_CNT bits (see Section 6.55).

Bit 7 - ST_TRIG - Determines the start trigger for the LED Pulse behavior.

‘0’ (default) - The LED will Pulse when a touch is detected or the drive bit is set.

‘1’ - The LED will Pulse when a release is detected or the drive bit is cleared.

The Pulse 1 operation is shown in Figure 6.1 (non-inverted polarity LEDx_POL = 1) and Figure 6.2

(inverted polarity LEDx_POL = 0).

1 0 Pulse 2

The LED will “Pulse” when the start trigger

is detected. When the stop trigger is

detected, it will “Pulse” a programmable

number of times then return to its minimum

brightness.

Touch Detected

or LED Output

Control bit set

Release

Detected or

LED Output

Control bit

cleared

1 1 Breathe

The LED will breathe. It will be driven with

a duty cycle that ramps up from the

programmed minimum duty cycle (default

0%) to the programmed maximum duty

cycle (default 100%) and then back down.

Each ramp takes up 50% of the

programmed period. The total period of

each “breath” is determined by the LED

Breathe Period controls - see Section 6.54.

Touch Detected

or LED Output

Control bit set

Release

Detected or

LED Control

Output bit

cleared

Table 6.74 LED Pulse 1 Period Register

ADDRR/W REGISTER B7 B6B5B4B3B2 B1 B0DEFAULT

84h R/W LED Pulse 1

Period

ST_

TRIG

P1_

PER6

P1_

PER5

P1_

PER4

P1_

PER3

P1_

PER2

P1_

PER1

P1_

PER0 20h

Table 6.73 LEDx_CTL Bit Decode (continued)

LEDX_CTL

[1:0]

OPERATION DESCRIPTION

START

TRIGGER

STOP

TRIGGER10

Multiple Channel Capacitive Touch Sensor and LED Driver

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Revision 1.0 (08-30-10) 90 SMSC CAP1214

DATASHEET

Figure 6.1 Pulse 1 Behavior with Touch Trigger and Non-inverted Polarity

Figure 6.2 Pulse 1 Behavior with Touch Trigger and Inverted Polarity

Table 6.75 LED Pulse / Breathe Period Example

SETTING

(HEX) SETTING (DECIMAL)

TOTAL PULSE / BREATHE PERIOD

(ms)

00h 0 32

01h 1 32

02h 2 64

03h 3 96

04h 4 128

Normal – untouched

operation

Normal – untouched

operation

Touch Detected

(100% - Pulse 1 Max Duty Cycle) * Brightness

X pulses after touch

Pulse 1 Period

(P1_PER)

(100% - Pulse 1 Min Duty Cycle) * Brightness

LED

Brightness

Normal – untouched

operation

Normal – untouched

operation

Touch Detected

Pulse 1 Min Duty Cycle * Brightness

X pulses after touch

Pulse Period

(P1_PER)

Pulse 1 Max Duty Cycle * Brightness

LED

Brightness

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1214 91 Revision 1.0 (08-30-10)

DATASHEET

6.53 LED Pulse 2 Period Register

The LED Pulse 2 Period Register determines the overall period of a pulse operation as determined by

the LED_CTL registers (see Table 6.73 - setting 10b). Each LSB represents 32ms so that a setting of

14h (20d) would represent a period of 640ms. The total range is from 32ms to 4.06 seconds (see

Table 6.75).

The number of pulses is programmable as determined by the PULSE2_CNT bits (see Section 6.55).

The Pulse 2 Behavior is shown in Figure 6.3 (non-inverted polarity LEDx_POL = 1) and Figure 6.4

(inverted polarity LEDx_POL = 0).

. . . . . . . . .

7Ch 124 3,968

7Dh 125 4,000

7Eh 126 4,032

7Fh 127 4,064

Table 6.76 LED Pulse 2 Period Register

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

85h R/W LED Pulse 2

Period -P2_

PER6

P2_

PER5

P2_

PER4

P2_

PER3

P2_

PER2

P2_

PER1

P2_

PER0 14h

Figure 6.3 Pulse 2 Behavior with Non-Inverted Polarity

Table 6.75 LED Pulse / Breathe Period Example (continued)

SETTING

(HEX) SETTING (DECIMAL)

TOTAL PULSE / BREATHE PERIOD

(ms)

. . .

Normal –

untouched

operation

Normal –

untouched

operation

Touch Detected

(100% - Pulse 2 Min Duty Cycle) *

Brightness

(100% - Pulse 2 Max Duty Cycle) * Brightness

X additional pulses after release

Release Detected

Pulse

Period

(P2_PER)

LED

Brightness

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.0 (08-30-10) 92 SMSC CAP1214

DATASHEET

6.54 LED Breathe Period Register

The LED Breathe Period Register determines the overall period of a breathe operation as determined

by the LED_CTL registers (see Ta b l e 6 . 7 3 - setting 11b). Each LSB represents 32ms so that a setting

of 14h (20d) would represent a period of 640ms. The total range is from 32ms to 4.06 seconds (see

Table 6.75).

6.55 LED Configuration Register

The LED Configuration Register controls the number of pulses that are sent for the Pulse 1 and Pulse

2 LED output behaviors.

Bit 6 - RAMP_ALERT - Determines whether the device will assert the ALERT pin when LEDs actuated

by the LED Output Control Register bits (see Section 6.46, "LED Output Control Registers") have

finished their respective behaviors.

‘0’ (default) - The ALERT pin will not be asserted when LEDs actuated by the LED Output Control

‘1’ - The ALERT pin will be asserted whenever any LED that is actuated by the LED Output Control

Figure 6.4 Pulse 2 Behavior with Inverted Polarity

Table 6.77 LED Breathe Period Register

ADDRR/W REGISTER B7 B6B5B4B3B2 B1 B0DEFAULT

86h R/W LED Breathe

Period -BR_

PER6

BR_

PER5

BR_

PER4

BR_

PER3

BR_

PER2

BR_

PER1

BR_

PER0 5Dh

Table 6.78 LED Configuration Registers

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

88h R/W LED Config - RAMP_

ALERT PULSE2_CNT[2:0] PULSE1_CNT[2:0] 24h

Normal –

untouched

operation

Normal –

untouched

operation

Touch Detected

Pulse 2 Max Duty Cycle * Brightness

Pulse 2 Min Duty Cycle * Brightness

X additional pulses after release

Release Detected

Pulse

Period

(P2_PER)

LED

Brightness . . .

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1214 93 Revision 1.0 (08-30-10)

DATASHEET

Bits 5 - 3 - PULSE2_CNT[2:0] - Determines the number of pulses used for the Pulse 2 behavior as

shown in Ta b l e 6 . 7 9 . The default is 100b.

Bits 2 - 0 - PULSE1_CNT[2:0] - Determines the number of pulses used for the Pulse 1 behavior as

shown in Ta b l e 6 . 7 9 .

6.56 LED11 Configuration Register

The LED11 Configuration Register controls the base frequency and number of steps for LED11.

APPLICATION NOTE: Setting in this register are ignored unless the LED11_CFG bit is set in the Configuration 2

Bits 5 - 4 - LED11_STEPS[1:0] - Determines the number of steps used to transition between minimum

and maximum duty cycle settings for LED11, as shown in Table 6.81.

Table 6.79 PULSE_CNT Decode

PULSEX_CNT[2:0]

NUMBER OF BREATHS21 0

00 0 1

00 1 2

01 0 3

01 1 4

1 0 0 5 (default)

10 1 6

11 0 7

11 1 8

Table 6.80 LED Configuration Registers

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

8Ah R/W LED11 Config - - LED11_STEPS

[1:0]

VAR_

PWM LED11_CLK[2:0] 00h

Table 6.81 LED11_STEPS Bit Decode

LED11_STEPS[1:0]

NUMBER OF STEPS10

0 0 256 (default)

01 128

10 64

11 32

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.0 (08-30-10) 94 SMSC CAP1214

DATASHEET

Bit 3 - VAR_PWM - Determines whether fixed or variable PWM frequency will be used for LED11.

‘0’ (default) - LED11 PWM frequency is fixed, regardless of pulse/breathe period and/or minimum

and maximum duty cycle settings.

‘1’ - LED11 PWM frequency is variable, based on pulse/breathe period (if behavior is not Direct)

and minimum and maximum duty cycle settings.

Bits 2 - 0 - LED11_CLK[2:0] - Determines the base clock frequency used for LED11, as shown in

Table 6.82.

APPLICATION NOTE: If the base frequency is reduced, but the number of steps is not reduced, resolution may be

lost and period lengths may be different than calculated.

6.57 LED Pulse and Breathe Duty Cycle Registers

The LED Pulse 1, Pulse 2, Breathe, and Direct Duty Cycle Registers determine the minimum and

maximum duty cycle settings used for the LEDs for each LED behavior. These settings affect the

brightness of the LED when it is fully off and fully on.

The LED driver duty cycle will ramp up from the minimum duty cycle to the maximum duty cycle and

back down again.

Table 6.82 LED11_CLK Decode

LED11_CLK[2:0]

CLOCK RUNNING LED1121 0

0 0 0 500kHz (default)

00 1 125kHz

0 1 0 62.5kHz

0 1 1 31.25kHz

1 0 0 15.625kHz

1 0 1 7.8125kHz

11 0 500kHz

11 1 500kHz

Table 6.83 LED Period and Breathe Duty Cycle Registers

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

90h R/W LED Pulse 1

Duty Cycle LED_P1_MAX_DUTY[3:0] LED_P1_MIN_DUTY[3:0] F0h

91h R/W LED Pulse 2

Duty cycle LED_P2_MAX_DUTY[3:0] LED_P2_MIN_DUTY[3:0] F0h

92h R/W LED Breathe

Duty Cycle LED_BR_MAX_DUTY[3:0] LED_BR_MIN_DUTY[3:0] F0h

93h R/W Direct Duty

Cycle LED_DR_MAX_DUTY[3:0] LED_DR_MIN_DUTY[3:0] F0h

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1214 95 Revision 1.0 (08-30-10)

DATASHEET

APPLICATION NOTE: When operating in Direct behavior mode, changes to the Duty Cycle settings will be applied

immediately. When operating in Breathe, Pulse 1, or Pulse 2 modes, the LED must be

unactuated and then re-actuated before changes to behavior are processed.

Bits 7 - 4 - LED_X_MAX_DUTY[3:0] - Determines the maximum PWM duty cycle for the LED drivers

as shown in Table 6.84

Bits 3 - 0 - LED_X_MIN_DUTY[3:0] - Determines the minimum PWM duty cycle for the LED drivers

as shown in Table 6.84.

6.58 LED Direct Ramp Rates Register

The LED Direct Ramp Rates Register control the rising and falling edge time of an LED that is

configured to operate in Direct behavior mode. The rising edge time corresponds to the amount of time

the LED takes to transition from its minimum duty cycle to its maximum duty cycle. Conversely, the

Table 6.84 LED Duty Cycle Decode

X_MAX/MIN_DUTY [3:0]

MAXIMUM DUTY

CYCLE

MINIMUM DUTY

CYCLE3210

0 0 0 0 7% 0%

0 0 0 1 9% 7%

0010 11% 9%

0011 14% 11%

0 1 0 0 17% 14%

0 1 0 1 20% 17%

0 1 1 0 23% 20%

0 1 1 1 26% 23%

1 0 0 0 30% 26%

1 0 0 1 35% 30%

1 0 1 0 40% 35%

1 0 1 1 46% 40%

1 1 0 0 53% 46%

1 1 0 1 63% 53%

1 1 1 0 77% 63%

1 1 1 1 100% 77%

Table 6.85 LED Direct Ramp Rates Register

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

94h R/W LED Direct

Ramp Rates - - RISE_RATE[2:0] FALL_RATE[2:0] 00h

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.0 (08-30-10) 96 SMSC CAP1214

DATASHEET

falling edge time corresponds to the amount of time that the LED takes to transition from its maximum

duty cycle to its minimum duty cycle.

Bits 5 - 3 - RISE_RATE[2:0] - Determines the rising edge time of an LED when it transitions from its

minimum drive state to its maximum drive state as shown in Table 6.86.

Bits 2 - 0 - FALL_RATE[2:0] - Determines the falling edge time of an LED when it transitions from its

maximum drive state to its minimum drive state as shown in Table 6.86.

6.59 LED Off Delay Register

The LED Off Delay Register determines off delays for the LED Direct and Breathe behaviors.

Bits 6 - 4 - BR_OFF_DLY[2:0] - Determines the Breathe behavior mode off delay, which is the amount

of time an LED in Breathe behavior mode remains inactive after it finishes a breathe pulse (ramp on

and ramp off), as shown in Figure 6.5 (non-inverted polarity LEDx_POL = 1) and Figure 6.6 (inverted

polarity LEDx_POL = 0). Available settings are shown in Ta b l e 6 . 8 8 .

Table 6.86 Rise / Fall Rate Cycle Decode

RISE/FALL_RATE [2:0]

RISE / FALL TIME (TRISE / TFALL)21 0

00 0 0

0 0 1 250ms

0 1 0 500ms

0 1 1 750ms

10 0 1s

10 1 1.25s

11 0 1.5s

11 1 2s

Table 6.87 LED Off Delay Register

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

95h R/W LED Off Delay

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1214 97 Revision 1.0 (08-30-10)

DATASHEET

Figure 6.5 Breathe Behavior with Non-Inverted Polarity

Figure 6.6 Breathe Behavior with Inverted Polarity

LED Actuated

100% - Breathe Max Min Cycle * Brightness

100% - Breathe Min Duty Cycle *

Brightness

LED Unactuated

Breathe Off

Delay

(BR_OFF_DLY)

LED

Brightness

Breathe

Period

(BR_PER)

LED Actuated

Breathe Max Duty Cycle * Brightness

Breathe Min Duty Cycle * Brightness

LED Unactuated

Breathe Off

Delay

(BR_OFF_DLY)

LED

Brightness

Breathe

Period

(BR_PER)

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.0 (08-30-10) 98 SMSC CAP1214

DATASHEET

Bits 2 - 0 - DIR_OFF_DLY[2:0] - Determines the Direct behavior mode turn-off delay, which is the

amount of time an LED in Direct behavior mode remains active after it is no longer actuated (such as

after a release has been detected or the drive state has been changed). Available settings are shown

in Ta b l e 6 . 8 9 .

The Direct behavior operation is determined by the combination of programmed Rise Time, Fall Time,

and Off Delay as shown in Figure 6.7 (non-inverted polarity LEDx_POL = 1) and Figure 6.8 (inverted

polarity LEDx_POL = 0).

Table 6.88 Breathe Off Delay Settings

BR_OFF_DLY [2:0

OFF DELAY210

0 0 0 0 (default)

0 0 1 0.25s

010 0.5s

0 1 1 0.75s

100 1.0s

1 0 1 1.25s

110 1.5s

111 2.0s

Table 6.89 Direct Off Delay Settings

DIR_OFF_DLY [2:0

OFF DELAY

TOFF_DLY

210

0 0 0 0 (default)

001 0.5s

010 1.0s

011 1.5s

100 2.0s

101 3.0s

110 4.0s

111 5.0s

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1214 99 Revision 1.0 (08-30-10)

DATASHEET

6.60 Sensor Calibration Registers

Figure 6.7 Direct Behavior for Non-Inverted Polarity

Figure 6.8 Direct Behavior for Inverted Polarity

Table 6.90 Sensor Calibration Registers

ADDR REGISTER R/W B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

B1h Sensor 1

Calibration R CAL1_9 CAL1_8 CAL1_7 CAL1_6 CAL1_5 CAL1_4 CAL1_3 CAL1_2 00h

B2h Sensor 2

Calibration R CAL2_9 CAL2_8 CAL2_7 CAL2_6 CAL2_5 CAL2_4 CAL2_3 CAL2_2 00h

B3h Sensor 3

Calibration R CAL3_9 CAL3_8 CAL3_7 CAL3_6 CAL3_5 CAL3_4 CAL3_3 CAL3_2 00h

B4h Sensor 4

Calibration R CAL4_9 CAL4_8 CAL4_7 CAL4_6 CAL4_5 CAL4_4 CAL4_3 CAL4_2 00h

B5h Sensor 5

Calibration R CAL5_9 CAL5_8 CAL5_7 CAL5_6 CAL5_5 CAL5_4 CAL5_3 CAL5_2 00h

Normal –

untouched

operation

RISE_RATE

Setting (tRISE)

(100% - Max Duty

Cycle) * Brightness

Touch

Detected

Release

Detected

Off Delay

(tOFF_DLY)

FALL_RATE

Setting (tFALL)

Normal –

untouched

operation

(100% - Min Duty Cycle) *

Brightness

LED

Brightness

Normal –

untouched

operation

RISE_RATE

Setting (tRISE)

Min Duty Cycle * Brightness

Touch

Detected

Release

Detected

Off Delay

(tOFF_DLY)

FALL_RATE

Setting (tFALL)

Normal –

untouched

operation

Max Duty Cycle * Brightness

LED

Brightness

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.0 (08-30-10) 100 SMSC CAP1214

DATASHEET

The Sensor Calibration Registers hold the 10-bit value that is used for the analog block when each

sensor is selected. These registers are read only. They are updated automatically by the digital block

when the analog re-calibration routine is performed.

These bits are cleared when the device is placed into Standby or Deep Sleep for all channels that are

not sampled.

6.61 Product ID Register

B6h Sensor 6

Calibration R CAL6_9 CAL6_8 CAL6_7 CAL6_6 CAL6_5 CAL6_4 CAL6_3 CAL6_2 00h

B7h Sensor 7

Calibration R CAL7_9 CAL7_8 CAL7_7 CAL7_6 CAL7_5 CAL7_4 CAL7_3 CAL7_2 00h

B8h Sensor 8

Calibration R CAL8_9 CAL8_8 CAL8_7 CAL8_6 CAL8_5 CAL8_4 CAL8_3 CAL8_2 00h

B9h Sensor 9

Calibration R CAL9_9 CAL9_8 CAL9_7 CAL9_6 CAL9_5 CAL9_4 CAL9_3 CAL9_2 00h

BAh Sensor 10

Calibration RCAL10_

CAL10_

200h

BBh Sensor 11

Calibration RCAL11_

CAL11_

7CAL11_6 CAL11_

CAL11_

200h

BCh Sensor 12

Calibration RCAL12_

CAL12_

CAL1_2

200h

BDh Sensor 13

Calibration RCAL13_

CAL13_

200h

BEh Sensor 14

Calibration RCAL14_

CAL14_

200h

D0h

Sensor 1

Calibration

Low byte

R CAL4_1 CAL4_0 CAL3_1 CAL3_0 CAL2_1 CAL2_0 CAL1_1 CAL1_0 00h

D1h

Sensor 5

Calibration

Low bye

R CAL8_1 CAL8_0 CAL7_1 CAL7_0 CAL6_1 CAL6_0 CAL5_1 CAL5_0 00h

D2h

Sensor 9

Calibration

Low bye

RCAL12_

CAL12_

CAL11_

1CAL11_0 CAL10_

CAL10_

0CAL9_1 CAL9_0 00h

D3h

Sensor 13

Calibration

Low bye

R- - - -

CAL14_

CAL13_

000h

Table 6.91 Product ID Register

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

FDhRProduct ID01011010 5Ah

Table 6.90 Sensor Calibration Registers (continued)

ADDR REGISTER R/W B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1214 101 Revision 1.0 (08-30-10)

DATASHEET

The Product ID Register stores a unique 8-bit value that identifies the device.

6.62 Revision Register

The Revision Register stores an 8-bit value that represents the part revision.

Table 6.92 Revision Register

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

FFhR Revision 10000000 80h

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.0 (08-30-10) 102 SMSC CAP1214

DATASHEET

Chapter 7 Package Information

7.1 Package Drawings

Figure 7.1 Package Diagram - 32-Pin QFN

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1214 103 Revision 1.0 (08-30-10)

DATASHEET

Figure 7.2 Package Dimensions - 32-Pin QFN

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.0 (08-30-10) 104 SMSC CAP1214

DATASHEET

Figure 7.3 Package PCB Land Pattern and Stencil

Figure 7.4 Package Detail A - Stencil Opening and Perimeter Lands

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1214 105 Revision 1.0 (08-30-10)

DATASHEET

Figure 7.5 Package Detail B - Thermal Vias and Stencil Opening

Figure 7.6 Package Land Pattern Dimensions

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.0 (08-30-10) 106 SMSC CAP1214

DATASHEET

7.2 Package Marking

All packages will marked as shown in Figure 7.7.

Figure 7.7 Package Markings

BOTTOM

BOTTOM MARKING NOT ALLOWED

Line 1 – SMSC Logo

Line 2 – Device Number, Version

Line 3 - Revision, Year, Week, 4-digit Engineering Code (RYYWWXXXX)

Line 4 – Lot Number

LINES 5: BEST FIT BETWEEN

PIN 1 MARK AND Pb-FREE SYMBOL

PB-FREE/GREEN SYMBOL

(Matte Sn)

0.4

4x 1.3PT

TOP

PIN 1

- V

MINIMUM CIRCLE “R”

DIAMETER = 0.80mm

Line 5 – Vendor ID and Country Code (VV – CC)

LINES 1, 2, 3, & 4: CENTER

HORIZONTAL ALIGNMENT

P12

RY WWXXX X

8H12 3 4 56 a

VV - CC

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1214 107 Revision 1.0 (08-30-10)

DATASHEET

Chapter 8 Datasheet Revision History

Table 8.1 Customer Revision History

REVISION LEVEL & DATE SECTION/FIGURE/ENTRY CORRECTION

Rev. 1.0 (08-30-10) Document release

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