CAP1206-1-SL - MICROCHIP TECHNOLOGY

 2013-2015 Microchip Technology Inc. DS00001567B-page 1

General Description

The CAP1206 is a multiple channel capacitive touch

sensor controller. It contains six (6) individual capaci-

tive touch sensor inputs with programmable sensitivity

for use in touch sensor applications. Each sensor input

is calibrated to compensate for system parasitic cap ac-

itance and automatically recalibrated to compensate

for gradual environmental changes.

The CAP1206 includes Multiple Pattern Touch recogni-

tion that allows the user to select a specific set of but-

tons to be touched simultaneously. If this pattern is

detected, a status bit is set and an interrupt is gener-

ated.

The CAP1206 has Active and Standby states, each

with its own sensor input configuration controls. Power

consumption in the Standby state is depende nt on the

number of sensor inputs enabled as well as averaging,

sampling time, and cycle time. Deep Sleep is the low-

est power state available, dr awing 5µA (typical) of cur-

rent. In this state, no sensor inputs are active, and

communications will wake the device.

Applications

• Desktop and Notebook PCs

• LCD Monitors

• Consumer Electronics

• Appliances

Features

• Six (6) Capacitive Touch Sensor Inputs

- Programmable sensitivity

- Automatic recal i bration

- Calibrates for parasitic capacitance

- Individual thresholds for each button

• Multiple Button Pattern Detection

• Power Button Support

• Press and Hold Feature for Volume-like Applica-

tions

• 3.3V or 5V Supply

• Analog Filtering for System Noise Sources

• RF Detection and Avoidance Filters

• Digital EMI Blocker

• 8kV ESD Rating on All Pins (HBM)

• Low Power Operation

- 5µA quiescent current in Deep Sleep

- 50µA quiescent current in Standby (1 sensor

input monitore d)

- Samples one or more channels in Standby

• SMBus / I2C Compliant Communication Interface

• Available in a 10-pin 3mm x 3mm DFN RoHS

compliant package

CAP1206

6-Channel Capacitive Touch Sensor

CAP1206

DS00001567B-page 2  2013-2015 Microchip Technology Inc.

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 2013-2015 Microchip Technology Inc. DS00001567B-page 3

CAP1206

Table of Contents

1.0 Introduction ..................................................................................................................................................................................... 4

2.0 Pin Description and Configuration .................................................................................................................................................. 8

3.0 Functional Description .................................................................................................................................................................. 21

4.0 Register Descriptions .................................................................................................................................................................... 58

5.0 Operational Characteristics ............................................................................ ............................................................................... 69

6.0 Package Outline ............................................................................................................................................................................ 85

Appendix A: Data Sheet Revision History ........................................................................................................................................... 91

The Microchip Web Site ...................................................................................................................................................................... 93

Customer Change Notification Service ............................................................................................................................................... 93

Customer Support ............................................................................................................................................................................... 93

Product Identification System ............................................................................................................................................................. 94

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CAP1206

1.0 INTRODUCTION

1.1 Block Diagram

1.2 Pin Diagrams

FIGURE 1-1: CAP1206 BLOCK DIAGRAM

FIGURE 1-2: CAP1206 14-PIN SOIC

SMBus

Protocol

VDD GND

Capacitive Touch Sensing Algorithm

CS1 CS2 CS3 CS4 CS5

SMCLK

SMDATA

ALERT#

CS6

CAP1206

N/C

CS1

ALERT#

SMDAT

SMCLK

N/C

CS2

CS3

CS4

CS5

CS6

GND

VDD

CAP1206

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FIGURE 1-3: CAP1206 PIN DIAGRAM (10-PIN 3 X 3 MM DFN)

TABLE 1-1: PIN DESCRIPTION FOR CAP1206

QFN Pin # SOIC Pin # Pin Name Pin Function Pin Type Unused

Connection

12CS1

Capacitive Touch Sensor Input 1 AIO Connect to

Ground

2 3 ALERT# ALERT# - Active low alert / interrupt out-

put for SMBus alert - requires pull-up

resistor (default) OD Connect to

Ground

34SMDATA

SMDATA - Bi-directional, open-drain

SMBus or I2C data - requires pull-up

resistor DIOD n/a

45SMCLK

SMCLK - SMBus or I2C clock input -

requires pull-up resistor DI n/a

5 7 VDD Positive Power supply Power n/a

69CS6

Capacitive Touch Sensor Input 6 AIO Connect to

Ground

710CS5

Capacitive Touch Sensor Input 5 AIO Connect to

Ground

811CS4

Capacitive Touch Sensor Input 4 AIO Connect to

Ground

912CS3

Capacitive Touch Sensor Input 3 AIO Connect to

Ground

10 13 CS2 Capacitive Touch Sensor Input 2 AIO Connect to

Ground

Bottom

Pad 8GND

Ground Power n/a

CS3

CS2

CS4

CS1

ALERT#

SMDATA

VDD

SMCLK CS5

CS6

GND

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CAP1206

1.3 Pin Description

APPLICATION NOTE: All digital pins are 5V tolerant pins.

The pin types are described in Table 1-2, "Pin Types".

TABLE 1-2: PIN TYPES

Pin Type Description

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

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

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

DIOD Digital Input / Open Drain Output - This pin is used as a 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.

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.

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CAP1206

2.0 ELECTRICAL SPECIFICATIONS

Note 2-1 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 2-2 For the 5V tolera nt pins that have a pull- up resistor, the voltage difference between V5VT_PIN and VDD

must never exceed 3.6V.

Note 2-3 The Pa ckage Power Dissi pation specification assumes a recommended the rmal via design consis ting

of a 2x3 matrix of 0.3mm (12mil) vias at 0.9mm pitch connected to the ground plane with a 1.6 x

2.3mm thermal landing.

Note 2-4 Junction to Ambient (JA) is dependent on the design of the thermal vias. Without thermal vias and

a thermal landing, the JA will be higher.

TABLE 2-1: ABSOLUTE MAXIMUM RATINGS

Voltage on VDD pin -0.3 to 6.5 V

Voltage on CS pins to GND -0.3 to 4.0 V

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

Voltage on 5V tolerant pins (|V5VT_PIN - VDD|) (see Note 2-2)0 to 3.6 V

Input current to any pin except VDD +10 mA

Output short circuit current Continuous N/A

Package Power Dissipation up to TA = 85°C for 10-pin DFN

(see Note 2-3)0.5 W

Junction to Ambient (JA) (see Note 2-4)78 °C/W

Operating Ambient Temperature Range -40 to 125 °C

Storage Temperature Range -55 to 150 °C

ESD Rating, All Pins, HBM 8000 V

CAP1206

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TABLE 2-2: ELECTRICAL SPECIFICATIONS

VDD = 3V to 5.5V, TA = 0°C to 85°C, all Typical values at TA = 25°C unless otherwise noted.

Characteristic Symbol Min Typ Max Unit Conditions

DC Power

Supply Voltage VDD 3.0 5.5 V

Supply Current ISTBY_DEF 120 170 µA Standby state active

1 sensor input monitored

Default conditions (8 avg, 70ms

cycle time)

ISTBY_LP 50 µA Standby state active

1 sensor input monitored

1 avg, 140ms cycle time

IDSLEEP_3V 5TBDµA Deep Sleep state active

No communications

TA < 40°C

3.135 < VDD < 3.465V

IDD 500 750 µA Capacitive Sensing Active

Capacitive Touch Sensor Inputs

Maximum Base

Capacitance CBASE 50 pF Pad untouched

Minimum Detectable

Capacitive Shift CTOUCH 20 fF Pad touched - default conditions

Recommended Cap

Shift CTOUCH 0.1 2 pF Pad touched - Not tested

Power Supply

Rejection PSR ±3 ±10 counts

/ V

Untouched Current Counts

Base Capacitance 5pF - 50pF

Negative Delta Counts disabled

Maximum sensitivity

All other parameters default

Power-On and Brown-out Reset (see Section 4.2, "Reset" )

Power-On Reset

Voltage VPOR 1 1.3 V Pin States Defined

Power-On Reset

Release Voltage VPORR 2.85 V Rising VDD

Ensured by design

Brown-Out Reset VBOR 2.8 V Falling VDD

VDD Rise Rate

(ensures internal

POR signal) SVDD 0.05 V/ms 0 to 3V in 60ms

Power-Up Timer

Period tPWRT 10 ms

Brown-Out Reset

Voltage Delay tBORDC 1µsV

DD = VBOR - 1

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CAP1206

Timing

Time to

Communications

Ready tCOMM_DLY 15 ms

Time to First

Conversion Ready tCONV_DLY 170 200 ms

I/O Pins

Output Low Voltage VOL 0.4 V ISINK_IO = 8mA

Output High Voltage VOH VDD -

0.4 VI

SOURCE_IO = 8mA

Input High Voltage VIH 2.0 V

Input Low Voltage VIL 0.8 V

Leakage Current ILEAK ±5 µA powered or unpowered

TA < 85°C

pull-up voltage < 3.6V if

unpowered

SMBus Timing

Input Capacitance CIN 5pF

Clock Frequency fSMB 10 400 kHz

Spike Suppression tSP 50 ns

Bus Free Time Stop

to Start tBUF 1.3 µs

Start Setup Time tSU:STA 0.6 µs

Star t H old Time t HD:STA 0.6 µs

Stop Setup Time tSU:STO 0.6 µs

Data Hold Time tHD:DAT 0 µs When transmitting to the master

Data Hold Time tHD:DAT 0.3 µs When receiving from the master

Data Setup Time tSU:DAT 0.6 µs

Clock Low Period tLOW 1.3 µs

Clock High Period tHIGH 0.6 µs

Clock / Data Fall

Time tFALL 300 ns Min = 20+0.1CLOAD ns

Clock / Data Rise

Time tRISE 300 ns Min = 20+0.1CLOAD ns

Capacitive Load CLOAD 400 pF per bus line

TABLE 2-2: ELECTRICAL SPECIFICATIONS (CONTINUED)

VDD = 3V to 5.5V, TA = 0°C to 85°C, all Typical values at TA = 25°C unless otherwise noted.

Characteristic Symbol Min Typ Max Unit Conditions

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CAP1206

3.0 COMMUNICATIONS

3.1 Communications

The CAP1206 communicates using the SMBus or I2C prot oco l .

3.2 System Management Bus

The CAP1206 communicates w ith a host controller, such as an MCHP SIO, through the SMBus. The SMBus is a two-

wire serial communication protocol be tween a computer host and its peripheral devices. A detailed timing dia gram is

shown in Figure 3-1. Stretching of the SMCLK signal is supported; however , the CAP1206 will not stretch the clock sig-

nal.

3.2.1 SMBUS START BIT

The SMBus Start bit is defined as a transition of the SMBus Da ta line from a logi c ‘1’ state to a logic ‘0’ state while the

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

3.2.2 SMBUS ADDRESS AND RD / WR BIT

The SMBus Address Byte consists of the 7 -bit clien t addre ss fol lowed by the RD / WR indicator bi t. If this RD / WR bit

is a logic ‘0’, then the SMBus Host is writing data to the client device. If this RD / WR bit is a logic ‘1’, then the SMBus

Host is reading data from the client device.

3.2.3 The CAP1206responds to SMBus address 0101_000(r/w). SMBUS DATA BYTES

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

3.2.4 SMBUS ACK AND NACK BITS

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

Data line low after the 8th bit of each byte that is transmitted. This applies to both the Write Byte and Block Write proto-

cols.

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.

3.2.5 SMBUS STOP BIT

The SMBus Stop bit is defined as a transition of the SMBus Da ta line from a l ogic ‘0’ state to a l ogic ‘1’ state while the

SMBus clock line is in a logic ‘1’ state. When the CAP1206 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.

FIGURE 3-1: 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

CAP1206

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3.2.6 SMBUS TIMEOUT

The CAP1206 includes an SMBus timeout feature. Following a 30ms period of inactivity on the SMBus where the

SMCLK pin is held low, the device will timeout and reset the SMBus interface.

The timeout function defaults to disabled. It can b e enabled by setting the TIMEOUT bit in the Config uration register

(see Section 5.6, "Configuration Registers").

3.2.7 SMBUS AND I2C COMPATIBILITY

The major differences between SMBus and I2C devices are highlighted here. For more information, refer to the SMBus

2.0 specification.

1. CAP1206supports I2C fast mode at 400kHz. This covers the SMBus max time of 100kHz.

2. Minimum frequency for SMBus communications is 10kHz.

3. The SMBus client pro tocol will reset if the cl ock is held low longer than 30ms (timeout con dition). This can be

enabled in the CAP1206 by setting the TIMEOUT bit in the Configuration register. I2C does not have a timeout.

4. The SMBus client protocol will reset i f both the clock a nd the data line are hig h for longer than 200u s (idle con-

dition). This can be enabled in the CAP1206by setting the TIMEOUT bit in the C onfiguration register. I2C does

not have an idle condition.

5. I2C devices do not support the Alert Response Addre ss functio nality (which is optional for SMBus).

6. 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. The CAP1206 supports I2C formatting only.

3.3 SMBus Protocols

The CAP1206 is SMBus 2.0 compatible and supports Write Byte, Read Byte, Send Byte, and Receive Byte as valid

protocols as shown below.

All of the below protocols use the convention in Table 3-1.

3.3.1 SMBUS WR ITE BYTE

The Write Byte is used to write one byte of data to a specific register as shown in Table 3-2.

3.3.2 SMBUS READ BYTE

The Read Byte protocol is used to read one byte of data from the registers as shown in Table 3-3.

TABLE 3-1: PROTOCOL FORMAT

Data Sent to

Device Dat a Sent to the

HOst

Data sent Data sent

TABLE 3-2: WRITE BYTE PROTOCOL

Start Slave

Address WR ACK Register

Address ACK Register

Data ACK Stop

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

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CAP1206

3.3.3 SMBUS SEND BYTE

The Send Byte protocol is used to set the intern al address register pointer to the correct address location. No d ata is

transferred durin g the Send Byte protocol as shown in Table 3-4.

APPLICATION NOTE: The Send Byte protocol is not functional in Deep Sleep (i.e., DSLEEP bit is set).

3.3.4 SMBUS RECEIVE BYTE

The Receive Byte protocol is used to read data from a register when the intern al register address pointer is known to

be at the right location (e.g. set via Send Byte). This is used for consecu tive reads of the same reg ister as shown in

Table 3-5.

APPLICATION NOTE: The Receive Byte protocol is not functional in Deep Sleep (i.e., DSLEEP bit is set).

3.4 I2C Protocols

The CAP1206 supports I2C Block Read and Block Write.

The protocols listed below use the convention in Table 3-1.

3.4.1 BLOCK READ

The Block Read is used to read multiple data bytes from a group of contiguous registers as shown in Table 3-6.

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 3-3: READ BYTE PROTOCOL

Start Slave 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

TABLE 3-4: SEND BYTE PROTOCOL

Start Slave Address WR ACK Register Address ACK Stop

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

TABLE 3-5: RECEIVE BYTE PROTOCOL

Start Slave Address RD ACK Register Data NACK Stop

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

TABLE 3-6: BLOCK READ PROTOCOL

Start Slave

Address WR ACK Register

Address ACK Start Slave 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 NACK STOP

CAP1206

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3.4.2 BLOCK WRITE

The Block Write is used to write multiple data bytes to a group of contiguous registers as shown in Table 3-7.

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.

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

TABLE 3-7: BLOCK WRITE PROTOCOL

Start Slave

Address WR ACK Register

Address ACK Register

Data ACK

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

Data ACK Register

Data ACK . . . Register

Data ACK Stop

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

TABLE 3-6: BLOCK READ PROTOCOL

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CAP1206

4.0 GENERAL DESCRIPTION

The CAP1206 is a multiple channel capacitive touch sensor. It contains six (6) individual capacitive touch sensor inputs

with programmable sensitivity for use in touch sensor ap plications. Each sensor input is calib rated to compensate for

system parasitic capacitance and automatically recalibrated to compensate for gradual environmental changes.

The CAP1206includes Multiple Pattern Touch recognition tha t allows the user to select a specific set of buttons to be

touched simultaneously. If this pattern is detected, a status bit is set and an interrupt is generated.

The CAP1206 has Active and S tandby states, each with its own sensor input configuration controls. Power consumption

in the Standby state is dependent on the number of sens or inputs enabled as well as averaging, sampling time, and

cycle time. Deep Sleep is the lowest power state available, drawing 5µA (typical) of current. In this state, no sensor

inputs are active, and communications will wake the device.

The device communicates with a host controller using SMBus / I2C. The host controller may poll the device for updated

information at any time or it may configure the device to flag an interru pt whenever a touch is detected on any se nsor

pad.

A typical system diagram is shown in Figure 4-1.

4.1 Power States

The CAP1206 has 3 power states depending on the st atus of the STBY and DSLEEP bits. When the device transitions

between power states, previously detected touches (for channels that are being de-activated) are cleared and the sen-

sor input status bits are reset.

1. Active - The normal mode of operation. The device is monitoring capacitive sensor inputs enabled in the Active

state.

2. S t andby - When the STBY bit is set, the device is monitoring the capacitive sensor inputs enabled in the S tandby

state. Interrupts can still be generated based on the enabled channels. The device will still respond to communi-

cations normally and can be returned to the Active state of operation by clearing the STBY bit. Power consump-

FIGURE 4-1: SYSTEM DIAGRAM FOR CAP1206

CAP1206

CS4

SMDATA

SMCLK

Embedded

Controller

3.0V to 5.5V

ALERT#

CS5

CS6

CS3

CS2

CS1

Touch

Button

Touch

Button

Touch

Button

Touch

Button

Touch

Button

Touch

Button

VDD

3.0V to 5.5 V

GND

1.0uF0.1uF

10kOhm

resistors

CAP1206

DS00001567B-page 15  2013-2015 Microchip Technology Inc.

tion in this state is dependent on the number of sensor inputs enabled as well as averaging, sampling time, and

cycle time.

3. Deep Sleep - When the DSLEEP bit is set, the device is in its lowest power state. It is not monitoring any capac-

itive sensor inputs. While in Deep Slee p, the CAP12 06 can be awa kened by SMBus communications targeting

the device. This will not cause the DSLEEP to be cleare d so the device will return to Deep Sleep once all com-

munications have stopped. The device can be returned to the Active state of operation by clearing the DSLEEP

bit.

4.2 Reset

The Power-On Reset (POR) circuit holds the device in reset until VDD has reached an acceptable level, Power-on Reset

Release V oltage (VPORR), for minimum operation. The power-up timer (PWRT) is used to extend the start-up period until

all device operation conditions have been met. The power-up timer starts after VDD reaches VPORR. POR and PORR

with slow rising VDD is shown in Figure 4-2.

The Brown-Out Reset (BOR) circuit ho lds the de vice in reset w hen VDD falls to a minimum level, VBOR for longer than

the BOR reset delay (tBORDC). After a BOR, when VDD rises above VPORR, the power-up timer is started again and must

finish before reset is released, as shown in Figure 4-2.

4.3 Capacitive Touch Sensing

The CAP1206 contains six (6) independent capacitive touch sensor inputs. Each sensor input has dynamic range to

detect a change of capacitance due to a touch. Additionally, each sensor input can be confi gured to be automatica lly

and routinely recalibrated.

4.3.1 CAPACITIVE TOUCH SENSING SETTINGS

Controls for managing capacitive touch se nsor inputs are determined by the power state.

4.3.1.1 Active State Sensing Settings

The Active state is used for normal operation. Sensor inputs being monitored are determined by the Sensor Input Enable

Register(see Section 5.7, "Sensor Input Enable Register"). Sensitivity is controlled by the Sen sitivity Control Register

(see Section 5.5, "Sensitivity Control Register"). Averaging, sample time, and cycle time are controlled by the A veraging

and Sampling Configuration Register (see Section 5.10, "Averaging and Sampling Configuration Register"). Each chan-

nel can have a separate touch detection threshold, as defined in the Sensor Input Threshold registers (see Section 5.18,

"Sensor Input Threshold Registers").

4.3.1.2 Standby State Sensing Settings

The S tandby state is used for standby operation. In general, fewer sensor inputs are enabled, and they are programmed

to have more sensitivity. Sensor inputs being monitored are determined by the Standby Channel Register (see Section

5.20, "Standby Channel Register"). Sensitivity is controlled by the Standby Sensitivity Register (see Section 5.22,

"Standby Sensitivity Register"). Averaging, sample time, and cycle time are controlled by the Averaging and Sampling

FIGURE 4-2: POR AND PORR WITH SLOW RISING VDD AND BOR WITH FALLING VDD

VDD

VBOR

TPWRT

GND

Undefined

SYSRST

VPOR

VPORR

TBORDC TPWRT

 2013-2015 Microchip Technology Inc. DS00001567B-page 16

CAP1206

Configuration Register (see Section 5.21, "Standby Configuration Register"). There is one touch detection threshold,

which applies to all sensors enabled in Standby, as defined in the Standby Threshold Register (see Section 5.23,

"Standby Threshold Register").

4.3.2 SENSING CYCLE

Except when in Deep Sleep, the device automatically initiates a sensing cycle and repeats the cycle every time it fin-

ishes. The cycle polls through each enabled sensor input starting with CS1 and extending through CS6. As each capac-

itive touch sensor input is polled, its measurement is compared against a baseline “not touched” measurement. If the

delta measurement is large enough to exceed the applicable threshold, a touch is detected and an interrupt can be gen-

erated (see Section 4.8.2, "Capacitive Sensor Input Interrupt Behavior").

The sensing cycle time is programmable (see Section 5.10, "Averaging and Sampling Configuration Register" and Sec-

tion 5.21, "S tandby Configuration Register"). If all enabled inputs can be sampled in less than the cycle time, the device

is placed into a l ower power state for th e remaind er of th e sensin g cycle. If the number of active sensor i nputs cannot

be sampled within the specified cycle time, the cycle time is extended and the device is not placed in a lower power

state.

4.4 Sensor Input Calibration

Calibration sets the Base Count Registers(Secti on 5.24, "Sensor Inpu t Base Count Registers") wh ich contain the “not

touched” values used for touch detection comparisons. Calibration automati cally occurs after a power-on reset (POR),

when sample time is changed, and whenever a sensor i nput is ne wly enabled (for e xample, when tra nsitioning from a

power state in which it was disabled to a power state in which it is enabled). During ca libration, the analog sensing cir-

cuits are tuned to the capacitance of the untouched pad. Then, samples are taken from each sensor input so that a base

count can be established. After calibration, the untouch ed delta counts are zero.

APPLICATION NOTE: During the calibration routine, the sensor inputs will not detect a press for up to 200ms and

the Sensor Base Count Register values will be invalid. In addition, any press on the

corresponding sensor pads will invalidate the calibration.

The host controller can force a calibration for selected sensor inputs at any time using the Calibration Activate and S tatus

RegisterSection 5.10.1, "Calibration Activate and S tatus Register". When a bit is set, the corresponding capacitive touch

sensor input will be calibrated (both analog and digital). The bit is automatically cleared once the calibration routine has

successfully finished.

If analog calibration fails for a se nsor input, the corresponding bit i s not cleared in the Calibration Activate and Status

Register, and the ACAL_FAIL bit is set in the Gene ral Status Regi ster(Section 5.2, "Status Registers"). An interrupt can

be generated. Analog calibration wi ll fail if a noise bit is set or if the calibration value is at the ma ximum or minimum

value. If digital calibration fails to generate base counts for a sensor input in the operating range, which is +12.5% from

the ideal base count (see TABLE 4-1:), indicating the base capacitance is out of range, the corresponding BC_OUTx bit

is set in the Base Count Out of Limit R egister(Section 5.16, "Base Count Out of Limit Register"), and the BC_ OUT bit

is set in the General Status Register (Section 5.2, "Status Registers"). An interrupt can be generated. By default, when

a base count is out of limit, analog calibration is repeated for the sensor input; alternatively, the sensor input can be

sampled using the out of limit base count(Section 5.6, "Configuration Registers").

During normal operation there are various options fo r recalibr ating the capacitive touch sensor inpu ts. Recalibration is

a digital adjustment of the base counts so that the untouched delta count is zero. After a recalibration, if a sensor input’s

base count ha s shi fted +12.5% from the ideal base count, a full calibration will be performed on the sensor input.

TABLE 4-1: IDEAL BASE COUNTS

Ideal Base Count Sample Time

3,200 320us

6,400 640us

12,800 1.28ms

25,600 2.56ms

CAP1206

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4.4.1 AUTOMATIC RECALIBRATION

Each sensor input is regularly recalibrated at a programmable rate(see CAL_CFG[2:0] in Section 5.17 , "Recalibrati on

Configuration Register" ). By default, the recali bration routine stores the average 64 previous measurements and peri-

odically updates the base “not touched” setting for the capacitive touch sensor input.

APPLICATION NOTE: Automatic recalibration only works when the delta count is below the active sensor input

threshold. It is disabled when a touch is detected.

4.4.2 NEGATIVE DELTA COUNT RECALIBRATION

It is possible that the device loses sensitivity to a touch. This may happen as a result of a noisy environment, reca libr a-

tion when the pad is touched but delta counts do not exceed the threshold, or other environmental changes. When this

occurs, the base untouched sensor input may generate negative delta count values. The NEG_DELTA_CNT[1:0]

bits(see Section 5.17, "Recalibration Configuration Register") can be set to force a recalibration after a specified number

of consecutive negative delta readings . After a delayed recalibration (see Section 4.4.3, "Delayed Recalibration ") the

negative delta count recalibration can correct after the touch is released.

APPLICATION NOTE: During this recalibration, the device will not respond to touches.

4.4.3 DELAYED RECALIBRATION

It is possible that a “stuck button” occurs when something is placed on a button which cau ses a touch to be detected

for a long period. By setting the MAX_ DUR_EN bit(see Section 5.6, "Configuration Re gisters"), a recalibration can be

forced when a touch is he ld on a button for longer than the duration specifie d in the MAX_DUR[3:0 ] bits (see Section

5.8, "Sensor Input Configuration Register").

Note 4-1 Delayed recalibration only works when the delta count is above the active sensor input threshold. If

enabled, it is invoked when a sensor pad touch is held longer than the MAX_DUR bit settings.

Note 4-2 For the power button, which requires that the button be held longer than a regular button, the time

specified by the MAX_DUR[3:0] bits is added to the time required to trigger th e qualifying event. This

will prevent the power button from being recalibrated during the time it is supposed to be held.

4.5 Power Button

The CAP1206 has a “power button” feature. In general, buttons are set for q uick respo nse to a touch, especially when

buttons are used for number keypads. However, there are cases where a quick response is not desired, such as when

accidentally brushing the power button causes a device to turn off or on unexpectedly.

The power button feature allows a sensor input to be designated as the “power button” (see Section 5.25, "Power Button

before an interrupt is generated; different times can be selected for the St andby and the Active states (see Section 5.26,

"Power Button Configuration Register"). The feature can also be enabled / disabled for both states separately.

APPLICATION NOTE: For the power button feature to work in the Standby and/or Active states, the sensor input

must be enabled in the applicable state.

After the designated power button has been held for the designated time, an interrupt is generated and the PWR bit is

set in the General Status Register (see Section 5.2, "Status Registers").

4.6 Multiple Touch Pattern Detection

The multiple touch pattern (MTP) detection circuitry can be used to detect lid closure or othe r si milar ev ents. An event

can be flagged based on either a minimum number of sensor inputs or on specific sensor inputs simultaneously exceed-

ing an MTP threshold or having their Noise Flag Status Register bits set. An interrupt can also be generated. During an

MTP event, all touches are blocked (see Section 5.14, "Multiple Touch Pa ttern Configuration Register").

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CAP1206

4.7 Noise Controls

4.7.1 LOW FREQUENCY NOISE DETECTION

Each sensor input has a low frequency noise detecto r that will sense i f low frequency noise is injected onto the input

with sufficient power to corrupt the readings. By default, if this occurs, the device will reject the corrupted sample see

DIS_ANA_NOISE bit in Section 5.6.1, "Configuration - 20h") and the correspon din g bit is set to a l ogic ‘1’ in the No ise

Flag Status register (see SHOW_RF_NOISE bit in Section 5.6.2, "Configuration 2 - 44h").

4.7.2 RF NOISE DETECTION

Each sensor input 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. By default, if RF noise is detected on a CS line, that sample

is removed and not compared against the threshold (see DIS_RF_NOISE bit in Section 5.6.2, "Configuration 2 - 44h").

4.7.3 NOISE STATUS AND CONFIGURATION

The Noise Flag Status (see Section 5.3, "Noise Flag Status Registers") bits can be used to indicate RF and/or other

noise. If the SHOW_RF_NOISE bit i n the Configuration Re gister (see Section 5.6, "Co nfiguration Registers") is set to

0, the Noise Flag Status bit for the capacitive sensor input is set if any analog noise is detected. If the

SHOW_RF_NOISE bit is set to 1, the Noise Flag Status bits will only be set if RF noise is detected.

The CAP1208 offers optional noise filtering controls for both analog and digital noise.

For analog noise, there are options for whether the data should be considered invalid. By default, the DIS_ANA_NOISE

bit (see Section 5.6.1, "Configuration - 20h") will block a touch on a sensor input if low frequency analog noise is

detected; the sample is discarded. By defau lt, the DIS_RF_NOISE bit (see Section 5 .6.2, "Configuration 2 - 44h") wi ll

block a touch on a sensor input if RF noise is detected; the sample is discarded.

For digital noise, sensor input noise thresholds can be set (see Section 5.19, "Sensor Input Noise Threshold Register").

If a capacitive touch sensor input exceeds the Sensor Noise Threshold but does not exceed the touch threshold (Sensor

Threshold (see Section 5.18, "Sensor Input Threshold Registers") in the Active state or Sensor Standby Threshold in

the Standby state (Section 5.23, "Standby Threshold Registe r")), it is determined to be caused by a noise spike. The

DIS_DIG_NOISE bit (see Section 5.6.1, "Configuration - 20h") can be set to discard samples that indicate a noise spike

so they are not used in the automatic recalibration routine (see Section 4.4.1, "Automatic Recalibration").

4.8 Interrupts

Interrupts are indicated by the setting of the INT bit in the Main Control Register(see Section 5.1, "Main Control Regis-

ter") and by assertion of the ALERT# pin. The ALERT# pin is cleared when the INT bit is cleared by the user . When the

INT bit is cleared by the user, status bits may be cleared (see Section 5.2, "Status Registers").

4.8.1 ALERT# PIN

The ALERT# pin is an active low output that is driven when an interrupt event is detected.

4.8.2 CAPACITIVE SENSOR INPUT INTERRUPT BEHAVIOR

Each sensor input can be programmed to enable / disable interrupts(see Section 5.11, "Interrupt Enable Register").

When enabled for a sensor input and the senso r input is not the designated power button, interrupts are generated in

one of two ways:

1. An interrupt is generated when a touch is detected and, as a user selectable option, when a release is detected

(by default - see INT_REL_n in Section 5.6.2, "Configuration 2 - 44h"). See FIGURE 4-4:.

2. If the repeat rate is ena bled then, so long as the tou ch is he ld, another in te rrupt will be g enera te d based on the

programmed repeat rate (see FIGURE 4-3:).

When the repeat rate is enabled for a sensor input (see Section 5.12, "Repeat Rate Enable Register"), the device uses

an additional control called MPRESS that determines whe ther a touch is flagged as a simple “touch” or a “press and

hold” (see Section 5.9, "Sensor Input Configuration 2 Register"). The MPRESS[3:0] bits set a minimum press timer.

When the button is touched, the timer begin s. If the sensor pad is released befo re the minimum press timer expires, it

is flagged as a touch and an interrupt (if enabled) is generated upon release. If the sensor input detects a touch for lon-

ger than this timer value, it is flagged as a “press and hold” event. So long as the touch is held, interrupts will be gener-

ated at the programmed repeat rate (see Section 5.8, "Sensor Input Configuration Register") and upon release (if

enabled).

CAP1206

DS00001567B-page 19  2013-2015 Microchip Technology Inc.

If a sensor input is the designated power button, an interrupt is not generated as soon as a touch is detected and repeat

rate is not applicable. See Section 4.8.3, "Interrupts for the Power Button".

APPLICATION NOTE: FIGURE 4-3: and FIGURE 4-4: show default operation which is to generate an interrupt upon

sensor pad release.

APPLICATION NOTE: The host may need to poll the device twice to determine that a release has been detected.

4.8.3 INTERRUPTS FOR THE POWER BUTTON

Interrupts are automatically enabled for the power button when the feature is enabled (see Section 4.5, "Power Button").

A touch must be held on the power button for the desig nated period of time before an interrupt is generated.

FIGURE 4-3: SENSOR INTERRUPT BEHAVIOR - REPEAT RATE ENABLED

FIGURE 4-4: SENSOR INTERRUPT BEHAVIOR - NO REPEAT RATE ENABLED

Touch Detected

INT bit

Button Status

Write to INT bit

Sensing Cycle

(35ms)

Min Press Setting

(280ms)

Interrupt on

Touch

Button Repeat Rate

(175ms) Button Repeat Rate

(175ms)

Interrupt on

Release

(optional)

ALERT# pin

Touch Detected

INT bit

Button Status

Write to INT bit

Sensing Cycle

(35ms)

Interrupt on

Touch Interrupt on

Release

(optional)

ALERT# pin

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CAP1206

4.8.4 INTERRUPTS FOR MULTIPLE TOUCH PATTERN DETECTION

An interrupt can be generated when the MTP pattern is matched (see Section 5.14, "Multiple Touch Pattern Configura-

tion Register").

4.8.5 INTERRUPTS FOR SENSOR INPUT CALIBRATION FAILURES

An interrupt can be genera ted when the ACAL_FAIL b it is set, indicati ng the failure to complete analog calibration of

one or more sensor inputs(see Section 5.2, "Status Registers"). This interrupt can be enabled b y setting the ACAL_-

FAIL_INT bit (see Section 5.6, "Configuration Registers").

An interrupt can be generated when the BC_OUT bit is set, indicating the base count is out of limit for one or more sen-

sor inputs(see Section 5.2, "S tatus Registers"). This interrupt can be enabled by setting the BC_OUT_INT bit (see Sec-

tion 5.6, "Configuration Registers" ).

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CAP1206

5.0 REGISTER DESCRIPTION

The registers shown in Table 5-1 are accessible through the communications protocol. An entry of ‘-’ indicates that the

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

TABLE 5-1: REGISTER SET IN HEXADECIMAL ORDER

Address R/W Register Name Function Default

Value Page

00h R/W Main Control Controls power states and indicates

an interrupt 00h Page 24

02h R/W General Status Stores general status bits 00h Page 24

03h R Sensor Input Status Returns the state of the sampled

capacitive touch sensor inputs 00h Page 24

0Ah R Noise Flag Status Stores the noise flags for sensor

inputs 00h Page 25

10h R Sensor Input 1 Delta

Count Stores the delta count for CS1 00h Page 26

11h R Sensor Inpu t 2 Delta

Count Stores the delta count for CS2 00h Page 26

12h R Sensor Input 3 Delta

Count Stores the delta count for CS3 00h Page 26

13h R Sensor Input 4 Delta

Count Stores the delta count for CS4 00h Page 26

14h R Sensor Input 5 Delta

Count Stores the delta count for CS5 00h Page 26

15h R Sensor Input 6 Delta

Count Stores the delta count for CS6 00h Page 26

1Fh R/W Sensitivity Control Controls the sensitivity of the

threshold and delta counts and data

scaling of the base counts 2Fh Page 26

20h R/W Configuration Controls general functionality 20h Page 28

21h R/W Sensor Input Enable Controls which sensor inputs are

monitored in Active 3Fh Page 29

22h R/W Sensor Input

Configuration Controls max duration and auto-

repeat delay A4h Page 30

23h R/W Sensor Input

Configuration 2 Controls the MPRESS (“press and

hold”) setting 07h Page 31

24h R/W Averaging and

Sampling Config Controls averaging and sampling

window for Active 39h Page 32

26h R/W Calibration Activate

and Status Forces calibration for capacitive

touch sensor inputs and indicates

calibration failure 00h Page 34

27h R/W Interrupt Enable Determines which capacitive sensor

inputs can generate interrupts 3Fh Page 35

CAP1206

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28h R/W Repeat Rate Enable Enables repeat rate for specific

sensor inputs 3Fh Page 35

2Ah R/W Multiple Touch

Configuration Determines the number of

simultaneous touches to flag a

multiple touch condition 80h Page 36

2Bh R/W Multiple Touch Pattern

Configuration Determines the multiple touch

pattern (MTP) configuration 00h Page 36

2Dh R/W Multiple Touch Pattern Determines the pattern or number of

sensor inputs used by the MTP

circuitry 3Fh Page 37

2Eh R Base Count Out of

Limit Indicates whether sensor inputs

have a base count out of limit 00h Page 38

2Fh R/W Recalibration

Configuration Determin es recalibration timi ng and

sampling window 8Ah Page 39

30h R/W Sensor Input 1

Threshold Stores the touch detection thre shold

for Active for CS1 40h Page 40

31h R/W Sensor Input 2

Threshold Stores the touch detection thre shold

for Active for CS2 40h Page 40

32h R/W Sensor Input 3

Threshold Stores the touch detection thre shold

for Active for CS3 40h Page 40

33h R/W Sensor Input 4

Threshold Stores the touch detection thre shold

for Active for CS4 40h Page 40

34h R/W Sensor Input 5

Threshold Stores the touch detection thre shold

for Active for CS5 40h Page 40

35h R/W Sensor Input 6

Threshold Stores the touch detection thre shold

for Active for CS6 40h Page 40

38h R/W Sensor Input Noise

Threshold Stores controls for selecting the

noise threshold for all sensor inputs 01h Page 41

Standby Configuration Registers

40h R/W Standby Channel Controls which sensor inputs are

enabled for Standby 00h Page 41

41h R/W Standby Configuration Controls averaging and sensing

cycle time for Standby 39h Page 42

42h R/W Standby Sensitivity Contro ls sensitivity settings used fo r

Standby 02h Page 43

43h R/W Standby Threshold Stores the touch detection threshold

for Standby 40h Page 44

44h R/W Configuration 2 Stores additional configuration

controls for the device 40h Page 28

Base Count Registers

TABLE 5-1: REGISTER SET IN HEXADECIMAL ORDER (CONTINUED)

Address R/W Register Name Function Default

Value Page

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CAP1206

50h R Sensor Input 1 Base

Count Stores the reference count val ue for

sensor input 1 C8h Page 44

51h R Sensor Input 2 Base

Count Stores the reference count val ue for

sensor input 2 C8h Page 44

52h R Sensor Input 3 Base

Count Stores the reference count val ue for

sensor input 3 C8h Page 44

53h R Sensor Input 4 Base

Count Stores the reference count val ue for

sensor input 4 C8h Page 44

54h R Sensor Input 5 Base

Count Stores the reference count val ue for

sensor input 5 C8h Page 44

55h R Sensor Input 6 Base

Count Stores the reference count val ue for

sensor input 6 C8h Page 44

Power Button Registers

60h R/W Power Button Specifies the power button 00h Page 45

61h R/W Power Button

Configuration Configures the power button feature 22h Page 46

Calibration Registers

B1h R Sensor Input 1

Calibration Stores the upper 8-bit calibration

value for CS1 00h Page 46

B2h R Sensor Input 2

Calibration Stores the upper 8-bit calibration

value for CS2 00h Page 46

B3h R Sensor Input 3

Calibration Stores the upper 8-bit calibration

value for CS3 00h Page 46

B4h R Sensor Input 4

Calibration Stores the upper 8-bit calibration

value for CS4 00h Page 46

B5h R Sensor Input 5

Calibration Stores the upper 8-bit calibration

value for CS5 00h Page 46

B6h R Sensor Input 6

Calibration Stores the upper 8-bit calibration

value for CS6 00h Page 46

B9h R Sensor Input

Calibration LSB 1 Stores the 2 LSBs of the calibration

value for CS1 - CS4 00h Page 46

BAh R Sensor Input

Calibration LSB 2 Stores the 2 LSBs of the calibration

value for CS5 - CS6 00h Page 46

ID Registers

FDh R Product ID Stores a fixed value that identifies

the CAP1206-1 67h Page 47

FEh R Manufacturer ID Stores a fixed value that identifies

MCHP 5Dh Page 47

FFh R Revision Stores a fi xed value that represents

the revision number 00h Page 47

TABLE 5-1: REGISTER SET IN HEXADECIMAL ORDER (CONTINUED)

Address R/W Register Name Function Default

Value Page

CAP1206

DS00001567B-page 24  2013-2015 Microchip Technology Inc.

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 character-

istics.

When a bit is “set”, this means it’s at a logic ‘1’. When a bit is “cleared”, this means it’s at a logic ‘0’.

5.1 Main Control Register

The Main Contro l re gi ster controls the primary power state of th e de vi ce (see Section 4.1, "Power States").

Bit 5 - STBY - Enables Standby.

• ‘0’ (default) - The device is not in the Standby state.

• ‘1’ - The device is in the S tandby state. Cap acitive touch sensor input scanning is limited to the sensor inputs set in

the Standby Channel register (see Section 5.20, "S tandby Channel Register"). The status registers will not be

cleared until read. Sensor inputs that are no longer sampled will flag a release and then remain in a non-touched

state.

Bit 4 - DSLEEP - Enables Deep Sleep.

• ‘0’ (default) - The device is not in the Deep Sleep state.

• ‘1’ - The device is in the Deep Sleep state. All sensor input scanning is disabled. The status registers are automat-

ically cleared and the INT bit is cleared. When this bit is set, the STBY bit has no effect.

Bit 0 - INT - Indicates that there is an interrupt (see Section 4.8, "Interrupts"). When this bit is set, it asserts the ALER T#

pin. If a channel detects a touch but interrupts are not enabled for that channel (see Section 5.1 1, "Interrupt Enable Reg-

ister"), no action is taken. This bit i s cleared b y writing a logic ‘0 ’ to it. When this bit is cleared, the AL ERT# pin will be

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

• ‘0’ - No interrupt pending.

• ‘1’ - An interrupt condition occurred, and the ALERT# pin has been asserted.

5.2 Status Registers

All status bits are cleared when the device enters Deep Sleep (DSLEEP = ‘1’ - see Section 5.1, "Main Control Register").

5.2.1 GENERAL STATUS - 02H

Bit 6 - BC_OUT - Indicates that the base count is out of limit for one or more enabled sensor inputs (see Section 4 .4,

"Sensor Input Calibration"). This bit will not be cleared until all enabled sensor inputs have base counts within the limit.

• ‘0’ - All enabled sensor inputs have base counts in the operating range.

• ‘1’ - One or more enabled sensor inputs has the base count out of limit. A status bit is set in the Base Count Out of

Limit Register (see Section 5.16, "Base Count Out of Limit Register").

TABLE 5-2: MAIN CONTROL REGISTER

Addr R/W Register B7 B6 B5 B4 B3 B2 B1 B0 Default

00h R/W Main Control - - STBY DSLEEP - - - INT 00h

TABLE 5-3: STATUS REGISTERS

Addr R/W Register B7 B6 B5 B4 B3 B2 B1 B0 Default

02h R General Status - BC_

OUT ACAL

_FAIL PWR - MULT MTP TOUCH 00h

03h R Sensor Input

Status - - CS6 CS5 CS4 CS3 CS2 CS1 00h

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CAP1206

Bit 5 - ACAL_F AIL - Indicates analog calibration failure for one or more enabled sensor inputs (see Section 4.4, "Sensor

Input Calibration" ). This bi t will not be clea red until all enabl ed sens or inputs have successfully completed analog ca li-

bration.

• ‘0’ - All enabled sensor inputs were successfully calibrated.

• ‘1’ - One or more enabled sensor inputs failed analog calibration. A status bit is set in the Calibration Active Regis-

ter (see Section 5.10.1, "Calibration Activate and Status Register").

Bit 4 - PWR - Indicates that the designated power button has been held for the designated time (see Section 4.5, "Power

Button"). This bit will cause the INT bit to be set. This bit is cleared when the INT bit is cleare d if there is no longer a

touch on the power button.

• ‘0’ - The power button has not been held for the required time or is not enabled.

• ‘1’ - The power button has been held for the required time.

Bit 2 - MULT - Indicates that the device is blocking de tected to uches due to the Mul tiple Touch detection circuitry (see

Section 5.13, "Multiple Touch Configuration Register"). This bit will not cause the IN T bit to be set and hence will not

cause an interrupt.

Bit 1 - MTP - Indicates that the device has detected a number of sensor inputs that exceed the MTP threshold either via

the pattern recognition or via the number of sensor inputs (see Section 5.14, "Multiple Touch Pattern Configuration Reg-

ister"). This bit will cause the INT bit to be set if the MTP_ALERT bit is also set. This bi t is cleared when the IN T bit is

cleared if the condition that caused it to be se t has been removed.

Bit 0 - TOUC H - Indi ca te s that a to u ch w as de tected. This bit is set if any bit in the Sensor Input Status register is set.

5.2.2 SENSOR INPUT STATUS - 03H

The Sensor Input Status Register stores status bits that indicate a touch has been detected. A value of ‘0’ in any bit

indicates th at no to u ch ha s be en detected. A value of ‘1’ in any bit indicates that a touch has been detected.

All bits are cleared when the INT bit is cleared and if a touch on the respective capacitive touch sensor input is no longer

present. If a touch is still detected, the bits will not be cleared (but this will not cause the interru pt to be asserted).

Bit 5 - CS6 - Indicates that a touch was detected on Sensor Input 6.

Bit 4 - CS5 - Indicates that a touch was detected on Sensor Input 5.

Bit 3 - CS4 - Indicates that a touch was detected on Sensor Input 4.

Bit 2 - CS3 - Indicates that a touch was detected on Sensor Input 3.

Bit 1 - CS2 - Indicates that a touch was detected on Sensor Input 2.

Bit 0 - CS1 - Indicates that a touch was detected on Sensor Input 1.

5.3 Noise Flag Status Registers

The Noise Flag St atus registers store status bits that can be used to indicate that the analog block detected noise above

the operating region of the analog detector or the RF noise detector (see Section 4 .7.3, "Noise Status and Con figura-

tion"). These bits indicate that the most recentl y received data from the sensor input is invalid and shou ld not be used

for touch detection. So long a s the bit is set for a particular channel, the delta count value is reset to 00 h and thus no

touch is detected.

These bits are not sticky and will be cleared automatically if the analog block does not report a noise error.

APPLICATION NOTE: If the MTP detection circuitry is enabled, these bits count as sensor inputs above the MTP

threshold (see Section 4.6, "Multiple Touch Pattern Detection") even if the corresponding

delta count is not. If the corresponding delta count also exceeds the MT P threshold, it is not

counted twice.

TABLE 5-4: NOISE FLAG S TATUS REGISTERS

AddrR/W Register B7 B6B5B4B3B2B1B0Default

0Ah R Noise Flag

Status --CS6_

NOISE CS5_

NOISE CS4_

NOISE CS3_

NOISE CS2_

NOISE CS1_

NOISE 00h

CAP1206

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APPLICATION NOTE: Regardless of the state of the Noise Status bits, if low frequency noise is detected on a

sensor input, that sample will be discarded unless the DIS_ANA_NOISE bit is set. As well,

if RF noise is detected on a sensor input, that sample will be discarded unless the

DIS_RF_NOISE bit is set.

5.4 Sensor Input Delta Count Registers

The Sensor Input Delta Count registers store the delta count that is compared against the threshold used to determine

if a touch has been dete cted. The count value represents a change in input due to the capacitance associated with a

touch on one of the sensor inputs and is referenced to a calibrated base “not touched” count value. The delta is an

instantaneous change and is updated once per sensor input per sensing cycle (see Section 4.3.2, "Sensing Cycle").

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 5.5).

The value is also capped at a neg ative value of 80h for negative delta counts which may result upon a release.

5.5 Sensitivity Control Register

The Sensitivity Control register controls the sensitivity of a touch detection.

Bits 6-4 DELTA_SENSE[2:0] - Controls the sensitivity of a touch detection for sensor inputs enabled in the Active state.

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 1 11b is the least sensitive. At the more sensitive settings, touches

are detected for a smaller delta capacitance corresponding to a “lighter” touch. These settings are more sensitive to

noise, however, and a noisy environment may flag more false touches with higher se nsitivity 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 re presents 64 out of ~25,000 which co rresponds to a touch

of approximately 0.25% of the base capacitance (or a C of 25fF from a 10pF base

capacitance). Conversely, a value of 1x is the least sensitive setting available. At these

TABLE 5-5: SENSOR INPUT DELTA COUNT REGISTERS

AddrR/W Register B7B6B5B4B3B2B1B0Default

10h R Sensor Input 1

Delta Count Sign 64 32 16 8 4 2 1 00h

11h R Sensor Input 2

Delta Count Sign 64 32 16 8 4 2 1 00h

12h R Sensor Input 3

Delta Count Sign 64 32 16 8 4 2 1 00h

13h R Sensor Input 4

Delta Count Sign 64 32 16 8 4 2 1 00h

14h R Sensor Input 5

Delta Count Sign 64 32 16 8 4 2 1 00h

15h R Sensor Input 6

Delta Count Sign 64 32 16 8 4 2 1 00h

TABLE 5-6: SENSITIVIT Y CONTROL REGISTER

Addr R/W Register B7 B6 B5 B4 B3 B2 B1 B0 Default

1Fh R/W Sensitivity Control - DELTA_SENSE[2:0] BASE_SHIFT[3:0] 2Fh

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CAP1206

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 C 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 presented. The scale factor represents

the multiplier to the bit-weighting presented in these register descriptions.

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 anal yzing the Cap Sensing

board performance and stability.

TABLE 5-7: DELTA_SENSE BIT DECODE

DELTA_SENSE[2:0] Sensitivity Multip lier

210

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 5-8: BASE_SHIFT BIT DECODE

BASE_SHIFT[3:0] Data Scaling Factor

32 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)

CAP1206

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5.6 Configuration Registers

The Configuration registers control general global functiona lity that affects the entire device.

5.6.1 CONFIGURATION - 20H

Bit 7 - TIMEOUT - Enables the timeout and idle functi onality of the SMBus protocol.

• ‘0’ (default) - The SMBus timeout and idle function ality 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 200us.

• ‘1’ - The SMBus timeout and idle functionality are enabled . The SMBus interface will reset 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 200us.

Bit 5 - DIS_DIG_NOISE - Determines whether the digital noise threshold (see Section 5.19, "Sensor Input Noise Thresh-

old Register") 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 recalibration routin e.

• ‘1’ (default) - The noise threshold is disabled. Any delta count that is less than the touch threshold is used for the

automatic recalibration 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 Nois e Status bits be set.

• ‘1’ - A touch is not blocked even if low frequency noise is detected.

Bit 3 - MAX_DUR_EN - Determines whether the maximum duration recalibration is enabled.

• ‘0’ (default) - The maximum duration recalibration functionality is disabled. A touch may be held indefinitely and no

recalibration will be performed on any sensor input.

• ‘1’ - The maximum duration recalibration functionality is enabled. If a touch is held for longer than the MAX_DUR

bit settings (see Section 5.8), the recalibration routine will be restarted (see Section 4.4.3, "Delayed Recalibra-

tion").

5.6.2 CONFIGURATION 2 - 44H

Bit 6 - BC_OUT_RECAL - Controls whether to retry analog calibration when the base count is out of limit for one or more

sensor inputs.

• ‘0’ - When the BC_OUTx bit is set for a sensor input, the out of limit base count will be used for the sensor input.

• ‘1’ (default) - When the BC_OUTx bit is set for a sensor input (see Section 5.16, "Base Count Out of Limit Regis-

ter"), analog calibration will be repeated on the sensor input.

Bit 5 - BLK_PWR_CTRL - Dete rmines whether the device will re duce power consump tion while waitin g between con-

version time completion and the end of the sensing cycle.

• ‘0’ (default) - The device will reduce power consumption during the time between the end of the last conversion

and the end of the sensing cycle.

• ‘1’ - The device will not reduce power consumption during the time between the end of the last conversion and the

end of the sensing cycle.

TABLE 5-9: CONFIGURATION REGISTERS

Addr R/W Register B7 B6 B5 B4 B3 B2 B1 B0 Default

20h R/W Configuration TIME

OUT -DIS_

DIG_

NOISE

DIS_

ANA_

NOISE MAX_

DUR_EN - - - 20h

44h R/W Configuration

2-BC_

OUT_

RECAL

BLK_

PWR_

CTRL

BC_

OUT_

INT

SHOW_

RF_

NOISE

DIS_

RF_

NOISE

ACAL

_FAIL

_INT

INT_

REL_

n40h

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CAP1206

Bit 4 - BC_OUT_INT - Controls the interrupt behavior when the base count is out of limit for one or more sensor inputs.

• ‘0’ (defaul t) - An inte rru pt is no t ge n era t ed whe n th e BC _O U T bi t i s set (see Section 5.2, "Status Registers").

• ‘1’ - An interrupt is generated when the BC_OUT bit is set.

Bit 3 - SHOW_RF_NOISE - Determines whether the Noise Status bits will show RF Noise as the only input source.

• ‘0’ (default) - The Noise S t atus registers will show both RF noise and low frequency noise if either is detected on a

capacitive touch sensor input.

• ‘1’ - The Noise S t atus registers will only show RF noise if it is detected on a capacitive touch sensor input. Low fre-

quency noise will still be detected and tou ches 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 - ACAL_F AIL_INT - Controls the interrupt behavior when analog calibration fails for one or more sensor inputs (see

Section 4.4, "Sensor Input Calibration").

• ‘0’ (default) - An interrupt is not generated when the ACAL_FAIL bit is set (see Section 5.2, "Status Registers").

• ‘1’ - An interrupt is generated when the ACAL_FAIL bit is set

Bit 0 - INT_REL_n - Controls the interrupt behavior when a release is detected on a button (see Section 4.8.2, "Capac-

itive Sensor Input Interrupt Behavior").

• ‘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 5.12).

• ‘1’ - An interrupt is generated when a press is detected and at the repeat rate but not when a release is detected.

5.7 Sensor Input Enable Register

The Sensor Input Enable register determine s whether a capacitive touch sensor input is included in the sensing cycle

in the Active state.

For all bits in this register:

• ‘0’ - The specified input is not included in the sensing cycle in the Active state.

• ‘1’ (default) - The specified input is included in the sensing cycle in the Active state.

Bit 5 - CS6_EN - Determines whether the CS6 input is monitored in the Active state.

Bit 4 - CS5_EN - Determines whether the CS5 input is monitored in the Active state.

Bit 3 - CS4_EN - Determines whether the CS4 input is monitored in the Active state.

Bit 2 - CS3_EN - Determines whether the CS3 input is monitored in the Active state.

Bit 1 - CS2_EN - Determines whether the CS2 input is monitored in the Active state.

Bit 0 - CS1_EN - Determines whether the CS1 input is monitored in the Active state.

TABLE 5-10: SENSOR INPUT ENABLE REGISTER

AddrR/WRegister B7 B6B5B4B3B2B1B0Default

21h R/W Sensor Input

Enable - - CS6_EN CS5_EN CS4_EN CS3_EN CS2_EN CS1_EN 3Fh

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5.8 Sensor Input Configuration Register

The Sensor Input Configuration Register controls timings associated with the capacitive sensor inputs.

Bits 7 - 4 - MAX_DUR[3:0] - (default 1010b) - Determines the maximum time that a sensor pad is allowed to be touched

until the capacitive touch sensor input is recalibrated (see Section 4.4.3, "Delayed Recalibration"), as shown in Table 5-

12.

Bits 3 - 0 - RPT_RATE[3:0] - (default 0100b) Determines the time duration between interrupt assertions when auto

repeat is enabled (see Section 4.8.2, "Capacitive Sensor Input Interrupt Behavior"). The resolution is 35ms and the

range is from 35ms to 560ms as shown in Table 5-13.

TABLE 5-11: SENSOR INPUT CONFIGURATION REGISTER

AddrR/W Register B7B6B5B4B3B2B1B0Default

22h R/W Sensor Input

Configuration MAX_DUR[3:0] RPT_RATE[3:0] A4h

TABLE 5-12: MAX_DUR BIT DECODE

MAX_DUR[3:0] Time before Recalibration

32 1 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

1 0 1 0 5600ms (default)

1 0 1 1 6720ms

1 1 0 0 7840ms

1 1 0 1 8906ms

1 1 1 0 10080ms

1 1 1 1 11200ms

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CAP1206

5.9 Sensor Input Configuration 2 Register

Bits 3 - 0 - M_PRESS[3:0] - (default 0111b) - Determines the minimum amount of time that sensor inputs configured to

use auto repeat must detect a sensor pad touch to detect a “press and hold” event (see Section 4.8.2, "Capacitive Sen-

sor Input Interrupt Behavior"). If the sensor input detects a touch for longe r than the M_PRESS[3:0 ] settings, a “press

and hold” event is detected. If a sensor input detects a touch for less than or equal to the M_PRESS[3:0] settings, a

touch event is detected.

The resolution is 35ms and the range is from 35ms to 560ms as shown in Table 5-15.

TABLE 5-13: RPT_RATE BIT DECODE

RPT_RATE[3:0] Interrupt Repeat Rate

3210

0000 35ms

0001 70ms

0 0 1 0 105ms

0 0 1 1 140ms

0 1 0 0 175ms (default)

0 1 0 1 210ms

0 1 1 0 245ms

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 5-14: SENSOR INPUT CONFIGURATION 2 REGISTER

AddrR/W Register B7B6B5B4B3B2B1B0Default

23h R/W Sensor Input

Configuration 2 - - - - M_PRESS[3:0] 07h

CAP1206

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5.10 Averaging and Sampling Configuration Register

The Averaging and Sampling Configuration register controls the number of samples t aken and the target sensing cycle

time for sensor inputs enabled in the Active state.

Bits 6 - 4 - AVG[2:0] - Determines the number of samples that are taken for all channels enabled in the Active state

during the sensing cycle as shown in Table 5-17. All samples are taken consecutively on the sa me channe l before the

next channel is samp led and the resu lt is averaged over the numbe r of samples measured before updating the mea-

sured results.

For example, if CS1, CS2, and CS3 are sampled during the sensing cycle, and the AVG[2:0] bits are set to take 4 sam-

ples per channel, then the full sensing cycle will be: CS1, CS1, CS1, CS1, CS2, CS2, CS2, CS2, CS3, CS3, CS3, CS3.

TABLE 5-15: M_PRESS BIT DECODE

M_PRESS[3:0] M_PRESS Settings

3210

0000 35ms

0001 70ms

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

0 1 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 5-16: AVERAGING AND SAMPLING CONFIGURATION REGISTER

Addr R/W Register B7 B6 B5 B4 B3 B2 B1 B0 Default

24h R/W Averaging and

Sampling

Config - AVG[2:0] SAMP_TIME[1:0] CYCLE_TIME

[1:0] 39h

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CAP1206

Bits 3 - 2 - SAMP_TIME[1:0] - Determines the time to take a single sample as shown in Table 5-18. Sample time affects

the magnitude of the base co unts, as shown in Table 4-1, "Ideal Base Counts".

Bits 1 - 0 - CYCLE_TIME[1:0] - Determines the desired sensing cycle time for channels enabled in the Active state, as

shown in Table 5-19. All enabled channels are sampled at the beginning of the sensing cycle. If additional time is

remaining, the device is placed into a lower power state for the remainder of the sensing cycl e.

TABLE 5-17: AVG BIT DECODE

AVG[2:0] Number Of Samples Taken Per

Measurement

210

000 1

001 2

010 4

0 1 1 8 (default)

100 16

101 32

110 64

1 1 1 128

TABLE 5-18: SAMP_TIME BIT DECODE

SAMP_TIME[1:0] Sample Time

0 0 320us

0 1 640us

1 0 1.28ms (default)

1 1 2.56ms

TABLE 5-19: CYCLE_TIME BIT DECODE

CYCLE_TIME[1:0] Progr a mmed Sensing Cycle Time

00 35ms

0 1 70ms (default)

1 0 105ms

1 1 140ms

CAP1206

DS00001567B-page 34  2013-2015 Microchip Technology Inc.

APPLICATION NOTE: The programmed sensing cycle time (CYCLE_TIME[1:0]) is only maintained if the actual time

to take the samples is less than the programmed cycle time. The AVG[2:0] bits will take

priority, so the sensing cycle time will be extended as necessary to accommodate the

number of samples to be measured.

5.10.1 CALIBRATION ACTIVATE AND STATUS REGISTER

The Calibration Activate and Status Register serves a dual function:

1. It forces the selected sensor inputs to be calibrated, affecting both the analog and digital blocks (see Section 4.4,

"Sensor Input Calibration"). When one or more bits are set, the device performs the calibration routine on the

corresponding sensor inputs. When the analog calibration routine is finished, the CALX[9:0] bits are updated (see

Section 5.27, "Sensor Input Calibration Registers"). If the analog calibrat ion routine completed successfully for a

sensor input, the corresponding bit is automatically cleared.

APPLICATION NOTE: In the case above, bits can be set by host or are automatically set by the device whenever

a sensor input is newly enabled (such as coming out of Deep Sleep, after power-on reset,

when a bit is set in the Sensor Enable Channel Enable register (21h) and the device is in

the Active state, or when a bit is set in the Standby Channel Enable Register (40h) and the

device is in the Standby state).

2. It serves as an indicator of an analog calibration fail ure. If any of the bits could not be cleared, the ACAL_FAIL

bit is set (see Section 5.2, "Status Registers"). A bit will fail to clear if a noise bit is set or if the calibrati on value

is at the maximum or minimum value.

APPLICATION NOTE: In the case above, do not check the Calibration Activate and Status bits for failures unless

the ACAL_FAIL bit is set. In addition, if a sensor input is newly enabled, do not check the

Calibration Activate and Status bits until time has elapsed to complete calibration on the

sensor input. Otherwise, the ACAL_FAIL bit may be set for one sensor input, but the newly

enabled sensor input may still be set to ‘1’ in the Calibration Activate and Status, not because

it failed, but because it has not been calibrated yet.

For all bits in this register:

• ‘0’ - No action needed.

• ‘1’ - Writing a ‘1’, forces a calibration on the corresponding sensor input. If the ACAL_F AIL flag is set and this bit is

set (see application note above), the sensor input could not complete analog calibration.

Bit 5 - CS6_CAL - Bit for CS6 input.

Bit 4 - CS5_CAL - Bit for CS5 input.

Bit 3 - CS4_CAL - Bit for CS4 input.

Bit 2 - CS3_CAL - Bit for CS3 input.

Bit 1 - CS2_CAL - Bit for CS2 input.

Bit 0 - CS1_CAL - Bit for CS1 input.

APPLICATION NOTE: Writing a ‘0’ to clear a ‘1’ may cause a planned calibration to be skipped, if the calibration

routine had not reached the sensor input yet.

TABLE 5-20: CALIBRATION ACTIVATE AND STATUS REGISTER

AddrR/WRegisterB7 B6B5B4B3B2B1B0Default

26h R/W Calibration

Activate

and Status --

CS6_

CAL CS5_

CAL CS4_

CAL CS3_

CAL CS2_

CAL CS1_

CAL 00h

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CAP1206

5.11 Interrupt Enable Register

The Interrupt Enable register determines whe ther a sensor pad touch or release (if ena bled) causes an interrupt (see

Section 4.8, "Interrupts").

For all bits in this register:

• ‘0’ - The ALERT# pin will not be asserted if a touch is detected on the specified sensor input.

• ‘1’ (default) - The ALERT# pin will be asserted if a touch is detected on the specified sensor input.

Bit 5 - CS6_INT_EN - Enables the ALERT# pin to be asserted if a touch is detected on CS6 (associated with the CS6

status bit).

Bit 4 - CS5_INT_EN - Enables the ALERT# pin to be asserted if a touch is detected on CS5 (associated with the CS5

status bit).

Bit 3 - CS4_INT_EN - Enables the ALERT# pin to be asserted if a touch is detected on CS4 (associated with the CS4

status bit).

Bit 2 - CS3_INT_EN - Enables the ALERT# pin to be asserted if a touch is detected on CS3 (associated with the CS3

status bit).

Bit 1 - CS2_INT_EN - Enables the ALERT# pin to be asserted if a touch is detected on CS2 (associated with the CS2

status bit).

Bit 0 - CS1_INT_EN - Enables the ALERT# pin to be asserted if a touch is detected on CS1 (associated with the CS1

status bit).

5.12 Repeat Rate Enable Register

The Repeat Rate Enable register enables the repeat rate of the sensor inputs as described in Section 4.8.2, "Capacitive

Sensor Input Interrupt Behavior" .

For all bits in this register:

• ‘0’ - The repeat rate for the speci fied sensor input is disabled. It will only generate an interrupt when a touch is

detected and when a release is detected (if enabled) no matter how long the touch is held.

• ‘1’ (default) - The repeat rate for the specified sensor input is enabled. In the case of a “touch” event, it will gener-

ate an interrupt when a touch is detected and a releas e is detected (as determined by the INT_REL_n bit - see

Section 5.6, "Configuration Registers"). In the case of a “press and hold” event, it will generate an interrupt when a

touch is detected and at the repeat rate so long as the touch is held.

Bit 5 - CS6_RPT_EN - Enables the repeat rate for capacitive touch sensor input 6.

Bit 4 - CS5_RPT_EN - Enables the repeat rate for capacitive touch sensor input 5.

Bit 3 - CS4_RPT_EN - Enables the repeat rate for capacitive touch sensor input 4.

Bit 2 - CS3_RPT_EN - Enables the repeat rate for capacitive touch sensor input 3.

Bit 1 - CS2_RPT_EN - Enables the repeat rate for capacitive touch sensor input 2.

TABLE 5-21: INTERRUPT ENABLE REGISTER

AddrR/WRegisterB7B6B5B4B3B2B1B0Default

27h R/W Interrupt

Enable --

CS6_

INT_EN CS5_

INT_EN CS4_

INT_EN CS3_

INT_EN CS2_

INT_EN CS1_

INT_EN 3Fh

TABLE 5-22: REPEAT RATE ENABLE REGISTER

AddrR/WRegisterB7B6B5B4B3B2B1B0Default

28h R/W Repeat Rate

Enable --

CS6_

RPT_EN CS5_

RPT_EN CS4_

RPT_EN CS3_

RPT_EN CS2_

RPT_EN CS1_

RPT_EN 3Fh

CAP1206

DS00001567B-page 36  2013-2015 Microchip Technology Inc.

Bit 0 - CS1_RPT_EN - Enables the repeat rate for capacitive touch sensor input 1.

5.13 Multiple Touch Configuration Register

The Multiple Touch Configuration register controls the settings for the multiple touc h detection circuitry. These settings

determine the number of simultaneous buttons that may be pressed before additional buttons are blocked and the MUL T

status bit is set.

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 flag the number of touches equal to pro-

grammed multiple touch threshold and block all others. It will remember which sensor inputs are valid and block all

others until that sensor pad has been released. Once a sensor pad has been released, the N detected touches

(determined via the sensing cycle order of CS1 - CS6) will be flagged and all others blocked.

Bits 3 - 2 - B_MUL T_T[1:0] - Determines the number of simultaneous touches on all sensor pads before a Multiple Touch

Event is detected and sensor inputs are blocked. The bit decode is given by Table 5-24.

5.14 Multiple Touch Pattern Configuration Register

The Multiple Touch Pattern Configuration register controls the settings for the multiple touch pattern detection circuitry.

This circuitry works like the multiple touch detection circuitry with the following differences:

1. The detection threshold is a percentage of the touch detection threshold as defined by the MTP_TH[1:0] bits

whereas the multiple touch circuitry uses the touch detection threshold.

2. The MTP detection circu itry either will detect a specific pattern of sensor inputs as determined by the Multiple

TABLE 5-23: MULTIPLE TOUCH CONFIGURATION

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] - - 80h

TABLE 5-24: B_MULT_T BIT DECODE

B_MULT_T[1:0] Number of Simultaneous Touches

0 0 1 (default)

01 2

10 3

11 4

TABLE 5-25: MULTIPLE TOUCH PATTERN CONFIGURATION

Addr R/W Register B7 B6 B5 B4 B3 B2 B1 B0 Default

2Bh R/W Multiple T ouch

Pattern Config MTP_ EN - - - MTP_TH[1:0] COMP_

PTRN MTP_

ALERT 00h

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CAP1206

Touch Pattern register settings or it will use the Multiple Touch Pattern register settings to determine a minimum

number of sensor inputs that will cause the MTP circuitry to flag an event (see Section 5.15, "Multiple Touch Pat-

tern Register"). When using pattern recognition mode, if all of the sensor inputs set by the Multiple Touch Pattern

set, the MTP bit will be set. When using the absolute number mode, if the number of sensor inputs with thresholds

above the MTP threshold or with Noise Fla g Status bits set is equ al to or greater than this nu mber, the MTP bit

will be set.

3. When an MTP event occurs, all touches are blocked and an interrupt is generated.

4. All sensor inputs will remain blocked so long as the requisite number of sensor inputs are above the MTP thresh-

old or have Noise Flag S tatus bits set. Once this condition is removed, touch detection will be restored. Note that

the MTP status bit is only cleared by writing a ‘0’ to the INT bit once the condition has been removed.

Bit 7 - MTP_EN - Enables the multiple touch pattern detection circuitry.

• ‘0’ (default) - The MTP detection circuitry is disabled.

• ‘1’ - The MTP detection circuitry is enabled.

Bits 3 - 2 - MTP_TH[1:0] - Determine the MTP threshold, as shown in Table 5-26. This threshold is a percentage of sen-

sor input threshold (see Section 5.18, "Sensor Input Threshold Regi sters") for inputs enabled in the Active state or of

the standby threshold (see Secti on 5.23, "Standby Threshold Register" ) for inputs enabled in the Standby state.

Bit 1 - COMP_PTRN - Determines whether the MTP detection circuitry will use the Multiple Touch Pattern register as a

specific pattern of sensor inputs or as an absolute number of sensor inputs.

• ‘0’ (default) - The MTP detection circuitry will use the Multiple Touch Pattern register bit settings as an absolute

minimum number of sensor inputs that must be above the threshold or have Noise Flag Status bits set. The num-

ber will be equal to the number of bits set in the register.

• ‘1’ - The MTP detection circuitry will use pattern recognition. Each bit set in the Multiple Touch Pattern register

indicates a specific sensor input that must have a delta count greater than the MTP threshold or have a Noise Flag

Status bit set. If the criteria are met, the MTP status bit will be set.

Bit 0 - MTP_ALERT - Enables an interrupt if an MTP event occurs. In either condition, the MTP status bit will be set.

• ‘0’ (default) - If an MTP event occurs, the ALERT# pin is not asserted.

• ‘1’ - If an MTP event occurs, the ALERT# pin will be asserted.

5.15 Multiple Touch Pattern Register

TABLE 5-26: MTP_TH BIT DECODE

MTP_TH[1:0] Threshold Divide Setting

0 0 12.5% (default)

0125%

1037.5%

1 1 100%

TABLE 5-27: MULTIPLE TOUCH PATTERN REGISTER

Addr R/W Register B7 B6 B5 B4 B3 B2 B1 B0 Default

2Dh R/W Multiple

Touch

Pattern --

CS6_

PTRN CS5_

PTRN CS4_

PTRN CS3_

PTRN CS2_

PTRN CS1_

PTRN 3Fh

CAP1206

DS00001567B-page 38  2013-2015 Microchip Technology Inc.

The Multiple Touch Pattern register acts as a pattern to identify an expected sensor input profile for diagnostics or other

significant events. There are two methods for how the Multiple Touch Pattern register is used: as specific sensor inputs

or number of sensor input that must exceed the MTP threshold or have Noise Flag Status bit s set. Which method is used

is based on the COMP_PTRN bit (see Section 5.14). The methods are descri bed below.

1. Specific Sensor Inputs: If, during a single sensing cycl e, the specific sensor inputs above the MTP threshold or

with Noise Flag Status bits set match those bits set in the Multiple Touch Pattern register, an MTP event is

flagged.

2. Number of Sensor Inputs: If, during a single sensing cycle, the number of sensor inputs with a delta count above

the MTP threshold or with Noise Flag S t atus bits set is equal to or greater than the number of pattern bits set, an

MTP event is flagged.

For all bits in this register:

• ‘0’ - The specified sensor input is not considered a part of the pattern.

• ‘1’ - The specified sensor input is considered a part of the pattern, or the absolute number of sensor inputs that

must have a delta count greater than the MTP threshold or have the Noise Flag Status bit set is increased by 1.

Bit 5 - CS6_PTRN - Determines whether CS6 is considered as part of the Multiple Touch Pattern.

Bit 4 - CS5_PTRN - Determines whether CS5 is considered as part of the Multiple Touch Pattern.

Bit 3 - CS4_PTRN - Determines whether CS4 is considered as part of the Multiple Touch Pattern.

Bit 2 - CS3_PTRN - Determines whether CS3 is considered as part of the Multiple Touch Pattern.

Bit 1 - CS2_PTRN - Determines whether CS2 is considered as part of the Multiple Touch Pattern.

Bit 0 - CS1_PTRN - Determines whether CS1 is considered as part of the Multiple Touch Pattern.

5.16 Base Count Out of Limit Register

The Base Count Out of Limit Register indicates which sensor inputs have base counts out of limit (see Section 4.4, "Sen-

sor Input Calibration"). When these bi ts are set, the BC_O U T bit i s set (see Section 5.2, "Status Registers").

For all bits in this register:

• ‘0’ - The base count for the specified sensor input is in the operating range.

• ‘1’ - The base count of the specified sens or input is not in the operating range.

Bit 5 - BC_OUT_6 - Indicates whether CS6 has a base count out of limit.

Bit 4 - BC_OUT_5 - Indicates whether CS6 has a base count out of limit.

Bit 3 - BC_OUT_4 - Indicates whether CS6 has a base count out of limit.

Bit 2 - BC_OUT_3 - Indicates whether CS3 has a base count out of limit.

Bit 1 - BC_OUT_2 - Indicates whether CS2 has a base count out of limit.

Bit 0 - BC_OUT_1 - Indicates whether CS1 has a base count out of limit.

TABLE 5-28: BASE COUNT OUT OF LIMIT REGISTER

AddrR/WRegisterB7B6B5B4B3B2B1B0Default

2Eh R Base Count

Out of Limit --

BC_

OUT_

BC_

OUT_

BC_

OUT_

BC_

OUT_

BC_

OUT_

BC_

OUT_

100h

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CAP1206

5.17 Recalibration Configuration Register

The Recalibration Configuration register controls some recalibration routine settings (see Section 4.4, "Sensor Input

Calibration") as well as advanced controls to program the Sensor Input Threshold register settings.

Bit 7 - BUT_LD_TH - Enables setting all Sensor Input Threshold registers by writing to the Sensor Input 1 Thresho ld

• ‘0’ - Each Sensor Input X Threshold register is updated individually.

• ‘1’ (default) - Writing the Sensor Input 1 Threshold register will automatically overwrite the Sensor Input Threshold

registers for all sensor inputs (Sensor Input Threshold 1 through Sensor Input Threshold 6). The individual Sensor

Input X Threshold registers (Sensor Input 2 Thresh old through Sensor Input 6 Threshold) can be individually

updated at any time.

Bit 6 - 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 5 and 6 should both be set to the same value. Either both should be set to ‘0’ or both

should be set to ‘1’.

Bit 5 - NO_CLR_NEG - Controls whether the consecutive negative delta counts counter is cleared if the noise st atus 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 4 - 3 - NEG_DELTA_CNT[1:0] - Determines the number of negative delta counts necessary to trigger a digital reca-

libration (see Section 4.4.2, "Negative Delta Count Recalibration"), as shown in Table 5-30.

Bits 2 - 0 - CAL_CFG[2:0] - Determines the update time and nu mber of samp les of th e automatic recalibratio n routine

(see Section 4.4.1, "Automatic Recalibration"). The settings apply to all sensor inputs universally (though individual sen-

sor inputs can be configured to support recalibration - see Section 5.10.1).

TABLE 5-29: RECALIBRATION CONFIGURATION REGISTERS

Addr R/W Register B7 B6 B5 B4 B3 B2 B1 B0 Default

2Fh R/W Recalibration

Configuration BUT_

LD_TH NO_CLR

_INTD NO_CLR

_NEG NEG_DELTA_

CNT[1:0] CAL_CFG[2:0] 8Ah

TABLE 5-30: NEG_DELTA_CNT BIT DECODE

NEG_DELTA_CNT[1:0] Number of Consecutive Negative Delta Count Values

00 8

0 1 16 (default)

10 32

1 1 None (disabled)

CAP1206

DS00001567B-page 40  2013-2015 Microchip Technology Inc.

Note 5-1 Recalibration Samples refers to the number of samples that are measured and averaged before the

Base Count is updated however does not control the base count update period.

Note 5-2 Update Time refers to the amount of time (in sensing cycle periods) that elapses before the Base

Count is updated. The time will depend upon the number o f channels enabled, the aver aging setting,

and the programmed sensing cycle time.

5.18 Sensor Input Threshold Registers

The Sensor Input Threshol d reg isters store the de lta threshol d that is used to determi ne if a tou ch has been detected.

When a touch occurs, the input signal of the corresponding sensor pad 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 5.17 - bit 7), writing data to the Sensor Input 1 Threshold register will

update all of the Sensor Input Threshold registe rs (31h - 35h inclusive).

TABLE 5-31: CAL_CFG BIT DECODE

CAL_CFG[2:0] Recalibration Samples

(see Note 5-1) Update Time (see

Note 5-2)

210

0 0 0 16 16

001 32 32

0 1 0 64 64 (default)

0 1 1 128 128

100 256 256

1 0 1 256 1024

1 1 0 256 2048

1 1 1 256 4096

TABLE 5-32: SENSOR INPUT THRESHOLD REGISTERS

AddrR/W Register B7B6B5B4B3B2B1B0Default

30h R/W Sensor Inp ut 1

Threshold -6432168421 40h

31h R/W Sensor Inp ut 2

Threshold -6432168421 40h

32h R/W Sensor Inp ut 3

Threshold -6432168421 40h

33h R/W Sensor Inp ut 4

Threshold -6432168421 40h

34h R/W Sensor Inp ut 5

Threshold -6432168421 40h

35h R/W Sensor Inp ut 6

Threshold -6432168421 40h

 2013-2015 Microchip Technology Inc. DS00001567B-page 41

CAP1206

5.19 Sensor Input Noise Threshold Register

The Sensor Input Noise Threshold register controls the value of a secondary internal threshold to detect noise and

improve the automatic recalibration routine. If a capacitive touch sensor input exceeds the Sensor Input Noise Threshold

but does not exceed the sensor input threshold, it is determined to be caused by a noise spike. That sample is not used

by the automatic recalibration routine. This fe ature can be disabled by setting the DIS_DIG_NOISE bit.

Bits 1-0 - CS1_BN_TH[1:0] - Controls the noise threshold for all capacitive touch sensor inputs, as shown in Table 5-34.

The threshold is proportional to the threshold setting.

5.20 Standby Channel Register

The S tandby Channel register controls which (if any) capacitive touch sensor inputs are enabled in Standby (see Section

4.3.1.2, "Standby State Sensing Settings").

For all bits in this register:

• ‘0’ (default) - The specified channel will not be monitored in Standby.

• ‘1’ - The specified channel will be monitored in Standby. It will use the standby threshold setting, and the standby

averaging and sensitivity settings.

Bit 5 - CS6_STBY - Controls whether the CS6 channel is enabled in Standby.

Bit 4 - CS5_STBY - Controls whether the CS5 channel is enabled in Standby.

Bit 3 - CS4_STBY - Controls whether the CS4 channel is enabled in Standby.

Bit 2 - CS3_STBY - Controls whether the CS3 channel is enabled in Standby.

Bit 1 - CS2_STBY - Controls whether the CS2 channel is enabled in Standby.

Bit 0 - CS1_STBY - Controls whether the CS1 channel is enabled in Standby.

TABLE 5-33: SENSOR INPUT NOISE THRESHOLD REGISTER

AddrR/W Register B7B6B5B4B3B2B1B0Default

38h R/W Sensor Input

Noise Threshold ------

CS_BN_TH

[1:0] 01h

TABLE 5-34: CSX_BN_TH BIT DECODE

CS_BN_TH[1:0] Percent Threshold Setting

0025%

0 1 37.5% (default)

1050%

1162.5%

TABLE 5-35: STANDBY CHANNEL REGISTER

AddrR/W Register B7 B6 B5B4B3B2B1B0Default

40h R/W Standby

Channel --

CS6_

STBY CS5_

STBY CS4_

STBY CS3_

STBY CS2_

STBY CS1_

STBY 00h

CAP1206

DS00001567B-page 42  2013-2015 Microchip Technology Inc.

5.21 Standby Configuration Register

The S tandby Configuration register controls averaging and sensing cycle time for sensor inputs enabled in S tandby . This

maintain normal functionality in the Active state.

Bit 7 - AVG_SUM - Determines whether the sensor inputs enabled in Standby will average the programmed number of

samples or whether they will accumulate for the progra mmed number of samp les.

• ‘0’ - (default) - The Standby enabled sensor input delta count values will be based on the average of the pro-

grammed number of samples when compared against the threshold.

• ‘1’ - The Standby enabled sensor input delta count values will be based on the summation of the progra mmed

number of samples when compared against the threshold. Caution should be used with this setting as a touch

may overflow the delta count registers and may result in false readings.

Bits 6 - 4 - STBY_AVG[2:0] - Determines the number of samples that are taken for all Standby enabled channels during

the sensing cycle as shown in Table 5-37. All samples are taken consecutively o n the same channel before the next

channel is sampled and the re sult is averaged over the number o f samples measured before updating the measured

results.

Bit 3 - 2 - STBY_SAMP_TIME[1:0] - Determines the time to take a single sample for sensor inputs enabled in Standby

as shown in Table 5-38.

TA BLE 5-36: STANDBY CONFIGURATION REGISTER

Addr R/W Register B7 B6 B5 B4 B3 B2 B1 B0 Default

41h R/W Standby

Configuration AVG_

SUM STBY_AVG[2:0] STBY_SAMP_

TIME[1:0] STBY_CY_TIME

[1:0] 39h

TABLE 5-37: STBY_AVG BIT DECODE

STBY_AVG[2:0] Number Of Samples Taken Per

Measurement

210

000 1

001 2

010 4

0 1 1 8 (default)

100 16

101 32

110 64

1 1 1 128

 2013-2015 Microchip Technology Inc. DS00001567B-page 43

CAP1206

Bits 1 - 0 - STBY_CY_TIME[2:0] - Determines the desired sensing cycle time for sensor inputs enabled during S t andby,

as shown in Table 5-39. All enabled chann els are sampled at the beginning of the sensing cycle. If additional time is

remaining, the device is placed into a lower power state for the remainder of the sensing cycl e.

APPLICATION NOTE: The programmed sensing cycle time (STDBY_CY_TIME[1:0] is only maintained if the actual

time to take the samples is less than the programmed cycle time. The STBY_AVG[2:0] bits

will take priority, so the sensing cycle time will be extended as necessary to accommodate

the number of samples to be measured.

5.22 Standby Sensitivity Register

The Standby Se nsitivity register controls the sensitivity for sensor inputs enabled in Standby.

Bits 2 - 0 - STBY_SENSE[2:0] - Controls the sensitivity for sensor inputs that are enabled in Standby. 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. At the more sensitive settings, touches are detected for

a smaller delta capacitance corresponding to a “lighter” touch. These settings are more sensitive to noise, however , and

a noisy environment may flag more false touches than higher sensitivity levels.

TABLE 5-38: STBY_SAMP_TIME BIT DECODE

STBY_SAMP_TIME[1:0] Sampling Time

0 0 320us

0 1 640us

1 0 1.28ms (default)

1 1 2.56ms

TABLE 5-39: STBY_CY_TIME BIT DECODE

STBY_CY_TIME[1:0] Programmed Sensing Cycle Time

00 35ms

0 1 70ms (default)

1 0 105ms

1 1 140ms

TABLE 5-40: STANDBY SENSITIVITY REGISTER

AddrR/W Register B7 B6B5B4B3B2B1B0Default

42h R/W Standby

Sensitivity - - - - - STBY_SENSE[2:0] 02h

CAP1206

DS00001567B-page 44  2013-2015 Microchip Technology Inc.

APPLICATION NOTE: A value of 128x is the most sensitive setting available. At the most sensitivity settings, the

MSB of the Delta Count register re presents 64 out of ~25,000 which co rresponds to a touch

of approximately 0.25% of the base capacitance (or a C 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 C of 3.33pF from a 10pF base capacitance).

5.23 Standby Threshold Register

The S tandby Threshold register stores 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 pad changes due to the capacitance associated with a

touch. If the sensor input change exceeds the threshold settings, a touch is detected.

5.24 Sensor Input Base Count Registers

TABLE 5-41: STBY_SENSE BIT DECODE

STBY_SENSE[2:0] Sensitivity Multip lier

210

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 5-42: STANDBY THRESHOLD REGISTER

AddrR/W Register B7B6B5B4B3B2B1B0Default

43h R/W Standby

Threshold -6432168421 40h

TABLE 5-43: SENSOR INPUT BASE COUNT REGISTERS

AddrR/W Register B7B6B5B4B3B2B1B0Default

50h R Sensor Input 1

Base Count 128 64 32 16 8 4 2 1 C8h

51h R Sensor Input 2

Base Count 128 64 32 16 8 4 2 1 C8h

 2013-2015 Microchip Technology Inc. DS00001567B-page 45

CAP1206

The Sensor Input Base Count registers store the calibrated “not touched ” input value from the capacitive touch sensor

inputs. These registers are periodically updated by the calibration and recalibration routines.

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 Input Base Count.

The internal adder is then reset and the recalibration routine continues.

The data presented is determi ned by the BASE_SHIFT[3:0] bits (see Section 5.5).

5.25 Power Button Register

The Power Button Reg ister indicates the sensor i nput that has been designated as the power button (see Section 4.5,

"Power Button").

Bits 2 - 0 - PWR_BTN[2:0] - When the power button feature is enabled, this control indicates the sensor input to be used

as the power button. The decode is shown in Table 5-45.

52h R Sensor Input 3

Base Count 128 64 32 16 8 4 2 1 C8h

53h R Sensor Input 4

Base Count 128 64 32 16 8 4 2 1 C8h

54h R Sensor Input 5

Base Count 128 64 32 16 8 4 2 1 C8h

55h R Sensor Input 6

Base Count 128 64 32 16 8 4 2 1 C8h

TABLE 5-44: POWER BUTTON REGISTER

AddrR/W Register B7B6B5B4B3B2B1B0Default

60h R/W Power Button - - - - - PWR_BTN[2:0] 00h

TABLE 5-45: PWR_BTN BIT DECODE

PWR_BTN[2:0] Senso r Inp ut Designate d as Power Bu tton

210

000 CS1

001 CS2

010 CS3

011 CS4

100 CS5

101 CS6

TABLE 5-43: SENSOR INPUT BASE COUNT REGISTERS (CONTINUED)

AddrR/W Register B7B6B5B4B3B2B1B0Default

CAP1206

DS00001567B-page 46  2013-2015 Microchip Technology Inc.

5.26 Power Button Configuration Register

The Power Button Configu ration Register con trols the len gth of ti me th at the designated powe r button must indi cate a

touch before an interrupt is generated and the power status indicator is set (see Section 4.5, "Power Button").

Bit 6 - STBY_PWR_EN - Enables the power button feature in the Standby state.

• ‘0’ (default) - The Standby power bu tton circuitry is disabled.

• ‘1’ - The Standby power bu tton circuitry is enabled.

Bits 5 - 4 - STBY_PWR_TIME[1:0] - Determin es the overall time, as shown in Table 5-47, that the power button must

be held in the Standby state, in order for an interrupt to be generated and the PWR bit to be set.

Bit 2 - PWR_EN - Enables the power button feature in the Active state.

• ‘0’ (default) - The power button circuitry is disabled in the Active state.

• ‘1’ -The power button circuitry is enabled in the Active state.

Bits 1 - 0 - PWR_TIME[1:0] - Determines the o verall ti me, as sho wn i n Table 5-47, that th e power b utto n must be he ld

in the Active state, in order for an interrupt to be generated and the PWR bit to be set.

5.27 Sensor Input Calibration Registers

TABLE 5-46: POWER BUTTON CONFIGURATION REGISTER

AddrR/WRegister B7 B6B5B4B3 B2 B1 B0Default

61h R/W Power Button

Configuration -STBY_

PWR_

EN STBY_PWR_

TIME [1:0] -PWR_

EN PWR_TIME [1:0] 22h

TABLE 5-47: POWER BUTTON TIME BITS DECODE

PWR_TIME[1:0] / STBY_PWR_TIME[1:0] Power Button Touch Hold T i me

0 0 280ms

0 1 560ms

1 0 1.12 sec (default)

1 1 2.24 sec

TABLE 5-48: SENSOR INPUT CALIBRATION REGISTERS

Addr Register R/W B7 B6 B5 B4 B3 B2 B1 B0 Default

B1h Sensor Input 1

Calibration R CAL1_9 CAL1_8 CAL1_7 CAL1_6 CAL1_5 CAL1_4 CAL1_3 CAL1_2 00h

B2h Sensor Input 2

Calibration R CAL2_9 CAL2_8 CAL2_7 CAL2_6 CAL2_5 CAL2_4 CAL2_3 CAL2_2 00h

B3h Sensor Input 3

Calibration R CAL3_9 CAL3_8 CAL3_7 CAL3_6 CAL3_5 CAL3_4 CAL3_3 CAL3_2 00h

B4h Sensor Input 4

Calibration R CAL4_9 CAL4_8 CAL4_7 CAL4_6 CAL4_5 CAL4_4 CAL4_3 CAL4_2 00h

 2013-2015 Microchip Technology Inc. DS00001567B-page 47

CAP1206

The Sensor Input Ca libration registers hold the 10-bit valu e that represents the last calibration value. The value rep-

resents the capacit ance applied to the internal sensing circuits to balance the capacit ance of the sensor input pad. Min-

imum (000h) and maximum (3FFh) values indicate analog calibration failure (see Section 4.4, "Sensor Input

Calibration").

5.28 Product ID Register

The Product ID register stores a unique 8-bit value that identifies the device.

5.29 Manufacturer ID Register

The Vendor ID register stores an 8-bit value that represents MCHP.

5.30 Revision Register

The Revision register stores an 8-bit value that represents the part revision.

B5h Sensor Input 5

Calibration R CAL5_9 CAL5_8 CAL5_7 CAL5_6 CAL5_5 CAL5_4 CAL5_3 CAL5_2 00h

B6h Sensor Input 6

Calibration R CAL6_9 CAL6_8 CAL6_7 CAL6_6 CAL6_5 CAL6_4 CAL6_3 CAL6_2 00h

B9h Sensor Input

Calibration LSB

1R CAL4_1 CAL4_0 CAL3_1 CAL3_0 CAL2_1 CAL2_0 CAL1_1 CAL1_0 00h

BAh Sensor Input

Calibration LSB

2R----CAL6_1 CAL6_0 CAL5_1 CAL5_0 00h

TABLE 5-49: PRODUCT ID REGISTER

AddrR/W Register B7B6B5B4B3B2B1B0Default

FDh R Product ID

CAP1206-1 01100111 67h

TABLE 5-50: VENDOR ID REGISTER

AddrR/W Register B7B6B5B4B3B2B1B0Default

FEh RManufacturer ID01011101 5Dh

TABLE 5-51: REVISION REGISTER

AddrR/W Register B7B6B5B4B3B2B1B0Default

FFhR Revision 00000000 00h

TABLE 5-48: SENSOR INPUT CALIBRATION REGISTERS (CONTINUED)

Addr Register R/W B7 B6 B5 B4 B3 B2 B1 B0 Default

 2013-2015 Microchip Technology Inc. DS00001567B-page 48

CAP1206

6.0 PACKAGE INFORMATION

6.1 CAP1206 Package Drawings

FIGURE 6-1: CAP1206 PACKAGE DRAWING - 10-PIN DFN 3MM X 3MM

CAP1206

DS00001567B-page 49  2013-2015 Microchip Technology Inc.

FIGURE 6-2: CAP1206 PACKAGE DIMENSIONS - 10-PIN DFN 3MM X 3MM

FIGURE 6-3: CAP1206 PCB LAND PATTERN AND STENCIL - 10-PIN DFN 3MM X 3MM

 2013-2015 Microchip Technology Inc. DS00001567B-page 50

CAP1206

FIGURE 6-4: CAP1206 PCB DETAIL A - 10-PIN DFN 3MM X 3MM

CAP1206

DS00001567B-page 51  2013-2015 Microchip Technology Inc.

FIGURE 6-5: CAP1206 PCB DETAIL B - 10-PIN DFN 3MM X 3MM

 2013-2015 Microchip Technology Inc. DS00001567B-page 52

CAP1206

FIGURE 6-6: CAP1206 LAND DIMENSIONS - 10-PIN DFN 3MM X 3MM

CAP1206

DS00001567B-page 53  2013-2015 Microchip Technology Inc.

FIGURE 6-7: CAP1206 14-LEAD PLASTIC SMALL OUTLINE, NARROW, 3.90 MM BODY (SOIC)

Note: For the most current package drawings, please see the Microchip Packaging Specification located at

http://www.microchip.com/packaging

 2013-2015 Microchip Technology Inc. DS00001567B-page 54

CAP1206

FIGURE 6-7: CAP1206 14-LEAD PLASTIC SMALL OUTLINE, NARROW, 3.90 MM BODY (SOIC)

Note: For the most current package drawings, please see the Microchip Packaging Specification located at

http://www.microchip.com/packaging

CAP1206

DS00001567B-page 55  2013-2015 Microchip Technology Inc.

FIGURE 6-7: CAP1206 14-LEAD PLASTIC SMALL OUTLINE, NARROW, 3.90 MM BODY (SOIC)

1RWH )RUWKHPRVWFXUUHQWSDFNDJHGUDZLQJVSOHDVHVHHWKH0LFURFKLS3DFNDJLQJ6SHFLILFDWLRQORFDWHGDW

KWWSZZZPLFURFKLSFRPSDFNDJLQJ

 2013-2015 Microchip Technology Inc. DS00001567B-page 56

CAP1206

FIGURE 6-8: CAP1206 PACKAGE MARKING

2 7 W W

N N N A

PIN 1

CAP1206-1-SL-TR CAP1206-2-SL-TR CAP1206-1-AIA-TR CAP1206-2-AIA-TR

27W

NNNA

TOP

BOTTOM

Bottom marking not allowed

PB-FREE/GREEN SYMBOL

(Ni/Pd PP-LF)

PIN 1

2x 0.6

Line 1 – Device Code, Week

Line 2 – Alphanumeric Traceability Code

Lines 1-2:

Line 3:

Center Horizontal Alignment

As Shown

H1W

NNNA

TOP

BOTTOM

Bottom marking not allowed

PB-FREE/GREEN SYMBOL

(Ni/Pd PP-LF)

PIN 1

2x 0.6

Line 1 – Device Code, Week

Line 2 – Alphanumeric Traceability Code

Lines 1-2:

Line 3:

Center Horizontal Alignment

As Shown

Line 1 – Device Code, Week

Line 2 – Alphanumeric Traceability Code

Line 1 – Device Code, Week

Line 2 – Alphanumeric Traceability Code

H 1 W W

N N N A

PIN 1

Pb-Free JEDEC® designator for Matte Tin (Sn)

 2013-2015 Microchip Technology Inc. DS00001567B-page 57

CAP1206

APPENDIX A: DEVICE DELT A

A.1 Delta from CAP1106 to CAP1206

The CAP1206 is pin- and register-compatible with the CAP1106, with the exception of the GAIN[1:0]

bits and ALT_POL bit.

1. Revision ID set to 00h.

2. Added Power Button feature (see Section 4.5, "Power Button").

3. Added ACAL_FAIL bit to flag analog calibration failures (see Section 5.2, "Status Registers") and

ACAL_FAIL_INT bit to control analog calibration failure interrupts (see Section 5.6, "Configuration

Registers").

4. Added BC_OUT bit to flag calibration failures regarding base counts out of limit (see Section 5.2,

"Status Registers") and BC_OUT_RECAL and BC_OUT_INT bit to control base count out of limit

behavior and interrupts (see Section 5.6, "Configuration Registers"). Added Base Count Out of

Limit Register to indicate which sensor inputs have base counts outside the operating range (see

Section 5.16, "Base Count Out of Limit Register").

5. Increased supply voltage range for 5V operation.

6. Increased operating temperature range from 0°C - 85°C to -40°C to 125°C.

7. Removed proximity detection gain (GAIN[1:0] bits).

8. Removed ALERT pin configuration (ALT_POL bit).

9. Register additions are shown in Table A-1, "Register Delta".

TABLE A-1: REGISTER DELTA

Address Register Delta Delta Default

00h

Page 24 Removed bits - Main

Control Register Removed GAIN[1:0] bits. 00h

02h

Page 24 Added bits - General

Status Register

Added bit 4 PWR for new Power Button

feature. Added bit 5 ACAL_FAIL to

indicate analog calibration fa ilure. Added

bit 6 BC_OUT. 00h

26h

Page 34

Renamed Calibration

Activate and Status

functionality

In addition to forcing a calibration, the

calibration for each sensor input. 00h

2Eh

Page 38 New - Base Count Out

of Limit Register new register for calibration status 00h

44h

Page 28 Added and removed

bits - Configuration 2

Added bit 1 ACAL_FAIL_INT. Added bit 4

BC_OUT_INT. Changed bit 6 from

ALT_POL to BC_OUT_RECAL. 40h

60h

Page 45 New - Power Button

61h

Page 46 New - Power Button

Configuration Register new register for configuring the Power

Button feature 00h

CAP1206

DS00001567B-page 58  2013-2015 Microchip Technology Inc.

FDh

Page 47 Changed - Product ID New product ID for CAP1206 67h

FFh

Page 47 Changed - Revision

TA BLE A-1: REGISTER DELTA (CONTINUED)

Address Register Delta Delta Default

 2013-2015 Microchip Technology Inc. DS00001567B-page 59

CAP1206

7.0 REVISION HISTORY

TABLE 7-1: REVISION HISTORY

Revision Level and Date Section/Figure/Entry Correction

DS00001567B (11-17-15) Added 14-lead SOIC packages, SOIC pinout

diagrams, package marking.

Updated ordering information.

CAP1206 Revision A replaces the previous SMSC version Revision 1.0

 2013-2015 Microchip Technology Inc. DS00001567B-page 60

CAP1206

THE MICROCHIP WEB SITE

Microchip provides online support via our WWW site at www.microchip.com. This web site is used as a means to make

files and information easily available to customers. Accessible by using your favorite Internet browser , the web site con-

tains the following information:

•Product Support – Data sheets and errata, application notes and sample programs, design resources, user’s

guides and hardware support documents, latest software releases and archived software

•General Technical Support – Frequently Asked Questi ons (FAQ), technical support requests, online discussion

groups, Microchip consultant program member listing

•Business of Mic r oc hi p – Product selector and ordering guides, latest Microchip press releases, listing of semi-

nars and events, listings of Microchip sales offices, distributors and factory representatives

CUSTOMER CHANGE NOTIFICATION SERVICE

Microchip’s customer notification service helps keep customers current on Microchip products. Subscribers will receive

e-mail notification whenever there are changes, updates, revisions or errata related to a specified product family or

development tool of interest.

To register, access the Microchip web site at www.microchip.com. Under “Supp ort”, click on “Customer Ch ange Notifi-

cation” and follow the registration instructions.

CUSTOMER SUPPORT

Users of Microchip products can receive assistance through several channels:

• Distributor or Representative

• Local Sales Office

• Field Application Engineer (FAE)

• Technical Support

Customers should contact their distributor, representative or field application engineer (FAE) for support. Local sales

offices are also available to help customers. A listing of sales offices and locations is i ncluded in the back of this docu-

ment.

Technical support is available through the web site at: http://www.microchip.com/support

 2013-2015 Microchip Technology Inc. DS00001567B-page 61

CAP1206

PRODUCT IDENTIFICATION SYSTEM

To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.

Device: CAP1206

Tape and Reel

Option TR Tape and Reel

Package:(2) AIA 10-pin DFN

SL 14-pin SOIC

Examples:

a) CAP1206-1-AIA-TR

0b0101_000[r/w] Addr ess

10-pin DFN package

b) CAP1206-2-SL-TR

0b0101_001[r/w] Ad dress

14-pin SOIC package

Note 1: Tape and Reel identifier only appears in the

catalog part number description. This iden-

tifier is used for ordering purposes and is

not printed on the device package. Chec k

with your Microchip Sales Office for pack-

age availability with the Tape and Reel

option.

2: For other small form-factor package avail-

ability and marking information, please

visit www.microchip.com/packaging or

contact your local sales office.

PART NO. [X] XX

Package Address

Option

Device

[XX]

Tape and Reel

Option

 2013-2015 Microchip Technology Inc. DS00001567B-page 62

CAP1206

Information contained in this publication regarding device applications and the like is provided only for your convenience and may be

superseded by updates. It is your responsibility to ensure that your application meets with your specifications. MICROCHIP MAKES NO

REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR

OTHERWISE, RELA TED TO THE INFORMA TION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE,

MERCHANT ABILITY OR FITNESS FOR PURPOSE. Microchip disclaims all liability arising from this information and its use. Use of Micro-

chip devices in life support and/or safety applications is entirely at the buyer ’s risk, and the buyer agrees to defend, indemnify and hold

harmless Microchip from any and all damages, claims, suits, or expe nses resulting from such use. No licenses are conveyed, implicitly or

otherwise, under any Microchip intellectual property rights unless otherwise state d.

Trademarks

The Microchip name and logo, the Microchip logo, dsPIC, FlashFlex, flexPWR, JukeBlox, KEELOQ, KEELOQ logo, Kleer, LANCheck,

MediaLB, MOST, MOST logo, MPLAB, OptoLyzer , PIC, PICST AR T, PIC32 logo, RightTouch, S pyNIC, SST, SST Logo, SuperFlash and

UNI/O are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries.

The Embedded Control Solutions Company and mTouch are registered trademarks of Microchip Technology Incorporated in the U.S.A.

Analog-for-the-Digital Age, BodyCom, chipKIT, chipKIT logo, CodeGuard, dsPICDEM, dsPICDEM.net, ECAN, In-Circuit Serial

Programming, ICSP, Inter-Chip Connectivity, KleerNet, KleerNet logo, MiWi, MPASM, MPF, MPLAB Certified logo, MPLIB, MPLINK,

MultiTRAK, NetDetach, Omniscient Code Generation, PICDEM, PICDEM.net, PICkit, PICtail, RightTouch logo, REAL ICE, SQI, Serial

Quad I/O, Total Endurance, TSHARC, USBCheck, VariSense, ViewSpan, WiperLock, Wireless DNA, and ZENA are trademarks of

Microchip Technology Incorporated in the U.S.A. and other countries.

SQTP is a service mark of Microchip Technology Incorporated in the U.S.A.

Silicon Storage Technology is a registered trademark of Microchip Technology Inc. in other countries.

GestIC is a registered trademark of Microchip Technology Germany II GmbH & Co. KG, a subsidiary of Microchip Technology Inc., in

other countries.

All other trademarks mentioned herein are property of their respective companies.

ISBN: 9781632779953

Note the following details of the code protection feature on Microchip devices:

• Microchip products meet the specification contained in their particular Microchip Data Sheet.

• Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the

intended manner and under normal conditions.

• There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our

knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data

Sheets. Most likely, the person doing so is engaged in theft of intellectual property.

• Microchip is willing to work with the customer who is concerned about the integrity of their code.

• Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not

mean that we are guaranteeing the product as “unbreakable.”

Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our

products. Attempts to break Microchip’ s code protection feature may be a violation of the Digital Millennium Copyright Act. If such act s

allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.

Microchip received ISO/TS-16949:200 9 certif ication for its worldwide

headquarters, design and wafer fabrication facilities in Chandler and

Tempe, Arizona; Gresham, Oregon and design centers in California

and India. The Company’s quality system processes and procedures

are for its PIC® MCUs and dsPIC® DSCs, KEELOQ® code hopping

devices, Serial EEPROMs, microperi pherals, nonvola tile memo ry and

analog product s. In addition, Microchip ’s quality system for the design

and manufacture of development systems is ISO 9001:2000 certifi ed.

QUALITYMANAGEMENTS

YSTEM

CERTIFIEDBYDNV

== ISO/TS16949==

 2013-2015 Microchip Technology Inc. DS00001567B-page 63

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07/14/15