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SX8633

Low Power, Capacitive Button Touch Controller (12 sensors)

wi th Enhanc ed LED Drivers and Proximity Sensing

GENERAL DESCRIPTION

The SX8633 is an ultra low power, fully integrated

12-channel solution for capacitive touch-buttons and

proximity detection applications. Unlike many

capacitive touch solutions, the SX8633 features

dedicated capacitive sense inputs (that requires no

external components) in addition to 8 general

purpose I/O ports (GPIO). Each GPIO is typically

configured as LED driver with independent PWM

source f or enhanc ed lighti n g c ontr ol suc h as intensit y

and fading.

The SX8633 inc lu des a ca pac it iv e 10 bit ADC analog

interface with automatic compensation up to 100pF.

The high resolution capacitive sensing supports a

wide variety of touch pad sizes and shapes and

allows capacitive buttons to be created using thick

overlay materials (up to 5mm) for an extremely

robust and ESD immune system design.

The SX8633 incorporates a versatile firmware that

was specially designed to simplify capacitive touch

solution design and offers reduced time-to-market.

Integrated multi-time programmable memory

provides the ultimate flexibility to modify key firmware

parameters (gain, threshold, scan period, auto offset

compensation… ) in the field without the need for

new firmware development.

The SX8633 supports the 400 kHz I²C serial bus

data protocol and includes a field programmable

slave addr ess. The tin y 5mm x 5mm footprint m akes

it an ideal solution for portable, battery powered

applications where power and density are at a

premium.

TYPICAL APPLIC ATION CIRCUIT

SX8633

cap2

cap3

cap4

cap5

cap6

cap8

cap7

cap9

gnd

gpio5

gpio4

gpio3

gpio2

gpio1

gnd

gpio0

cap1

cap0

vana

resetb

gnd

gpio7

vdig

gpio6

cap10

cap11

vdd

scl

intb

sda

analog

sensor

interface

micro

processor

RAM

ROM

NVM

I2C

GPIO

controller

power management

clock

generation

PWM

LED

controller

bottom plate

HOST

proximity

KEY PRODUCT FEATURES

 Complete twelve Sensors Capacitive Touch Controller for

Buttons

 Pre-configured for eight Buttons

 Eight LED Drivers with Individual Intensity, Fading

Control and Autolight Mode

 256 steps PWM Linear and Logarit hm ic contr ol

 Proximity Sensing up to several centimetres

 High Resolution Capacitive Sensing

 Up to 100pF of Offset Capacitance Compensation at

Full Sensitivity

 Capable of Sensing through Overlay Materials up to

5mm thick

 Extremely Low Power Optimized for Portable Application

 8uA (typ) in Sleep Mode

 80uA (typ) in Doze Mode (Scanning Period 195ms)

 220uA (typ) in Active Mode (Scanning Period 30ms)

 Programmable Scanning Period from 15ms to 1500ms

 Auto Offset Compensation

 Eliminates False Triggers due to Environmental

Factors (Temperature, Humidity)

 Initiated on Pow er-up and Configurable Intervals

 Multi-Time In-Field Programmable Firmware Parameters

for Ultimate Flexibility

 On-chip user programmab le mem ory for fast, sel f

contained start-up

 "Smart" Wake-up Sequence for Easy Activation from Doze

 No External Components per Sensor Input

 Internal Clock Requires No External Components

 Differential Sensor Sampling for Reduced EMI

 400 KHz Fast-Mode I²C Interface with Interrupt

 -40°C to +85°C Operation

APPLICATIONS

 Notebook/Netbook/Port abl e/H andhe ld co mput ers

 Cell phones, PDAs

 Consumer Products, Instrumentation, Automotive

 Mechanical Button Replacement

ORDERING INFORMATION

Part Number

Temperature

Range

Package

SX8633I05AWLTRT1

-40°C to +85°C

Lead Free MLPQ-W32

1 3000 Units/reel

* This device is RoHS/WEEE compliant and Halogen Free

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SX8633

Low Power, Capacitive Button Touch Controller (12 sensors)

wi th Enhanc ed LED Drivers and Proximity Sensing

Table of Contents

GENERAL DESCRIPTION ........................................................................................................................ 1

TYPICAL APPLIC ATION CIRCUIT ............................................................................................................ 1

KEY PRODUCT FEATURES..................................................................................................................... 1

APPLICATIONS ....................................................................................................................................... 1

ORDERING INFORMATION...................................................................................................................... 1

1 GENERAL DESCRIPTION ............................................................................................................... 4

1.1 Pin Diagram 4

1.2 Marking information 4

1.3 Pin Description 5

1.4 Simplified Block Diagram 6

1.5 Acronyms 6

2 ELECTRICAL CHARACTERISTICS ................................................................................................. 7

2.1 Absolute Maximum Ratings 7

2.2 Recommended Operating Conditions 7

2.3 Thermal Characteristics 7

2.4 Electrical Specifications 8

3 FUNCTIONAL DESCRIPTION ........................................................................................................ 10

3.1 Qu ickstart Applicatio n 10

3.2 Introduction 10

3.2.1 General 10

3.2.2 GPIOs 11

3.2.3 Parameters 11

3.2.4 Configuration 11

3.3 Scan Period 12

3.4 Operation modes 12

3.5 Sensors on the PCB 14

3.6 Button Information 14

3.6.1 Button Information 14

3.7 Analog Sensing In terface 15

3.8 Offset Compensation 16

3.9 Processing 17

3.10 Configuration 17

3.11 Power Management 19

3.12 Clock Circuitry 19

3.13 I2C interface 19

3.14 Reset 20

3.14.1 Power up 20

3.14.2 RESETB 20

3.14.3 Software Reset 21

3.15 Interrupt 22

3.15.1 Power up 22

3.15.2 Assertion 22

3.15.3 Clearing 22

3.15.4 Example 23

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SX8633

Low Power, Capacitive Button Touch Controller (12 sensors)

wi th Enhanc ed LED Drivers and Proximity Sensing

3.16 General Purpose Input and Outputs 23

3.16.1 Introduction and Definitions 23

3.16.2 GPI 24

3.16.3 GPP 24

3.16.4 GPO 25

3.16.5 Intensity index vs PWM pulse width 28

3.17 Smart Wake Up 29

4 PIN DESCRIPTIONS ..................................................................................................................... 30

4.1 Introduction 30

4.2 ASI pins 30

4.3 Host interface pins 31

4.4 Power management pins 34

4.5 General purpose IO pins 35

5 DETAILED CONFIGURATION DESCRIPTIONS .............................................................................. 36

5.1 Introduction 36

5.2 General Parameters 39

5.3 Capacit iv e Sensors Param eters 40

5.4 Button Parameters 44

5.5 Mapping Parameters 48

5.6 GPIO Parameters 51

6 I2C INTERFACE ........................................................................................................................... 55

6.1 I2C Write 55

6.2 I2C read 56

6.3 I2C Registers Overview 57

6.4 Status Registers 58

6.5 Control Registers 60

6.6 SPM Gateway Registers 62

6.6.1 SPM Write Sequence 63

6.6.2 SPM Read Sequence 64

6.7 NVM burn 65

6.8 Monitor Mode 66

7 APPLICATION INFORMATION ...................................................................................................... 67

7.1 Typical Application Schematic 67

7.2 Example of Touch+Proximity Module 68

7.2.1 Overview 68

7.2.2 Operation 68

7.2.3 Performance 68

7.2.4 Schematics 69

7.2.5 Layout 70

8 REFERENCES ............................................................................................................................. 71

9 PACKAGING INFORMATION ........................................................................................................ 72

9.1 Package Outline Drawing 72

9.2 Land Pattern 72

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SX8633

Low Power, Capacitive Button Touch Controller (12 sensors)

wi th Enhanc ed LED Drivers and Proximity Sensing

1 GENERAL DESCRIPTION

1.1 Pin Diagram

SX8633

Top View

910 11 12 13 14 15 16

2526

2728

3031

bottom ground pad

cap2

cap3

cap4

cap5

cap6

cap8

cap7

cap9

gnd

gpio5

gpio4

gpio3

gpio2

gpio1

gnd

gpio0

cap1

cap0

vana

resetb

gnd

gpio7

vdig

gpio6

cap10

cap11

vdd

scl

intb

sda

Figure 1 Pinout Diagram

1.2 Marking information

FH23

yyww

xxxxx

R05

yyww = Date Code

xxxxx = Semtech lot number

R05 = Semtech Code

Figure 2 Marking I nf ormation

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SX8633

Low Power, Capacitive Button Touch Controller (12 sensors)

wi th Enhanc ed LED Drivers and Proximity Sensing

1.3 Pin Description

Number Name Type Description

CAP2

Analog

Capacitive Sensor 2

CAP3

Analog

Capacitive Sensor 3

CAP4

Analog

Capacitive Sensor 4

CAP5

Analog

Capacitive Sensor 5

CAP6

Analog

Capacitive Sensor 6

CAP7

Analog

Capacitive Sensor 7

CAP8

Analog

Capacitive Sensor 8

CAP9

Analog

Capacitive Sensor 9

CAP10

Analog

Capacitive Sensor 10

CAP11

Analog

Capacitive Sensor 11

Analog

Integration Capacitor, negative terminal (1nF between CN and CP)

Analog

Integration Capacitor, positive terminal (1nF between CN and CP)

VDD

Power

Main input power supply

INTB

Digital Output

Interrupt, active LOW, requires pull up resistor (on host or external)

SCL

Digital Input

I2C Clock, requires pull up resistor (on host or external)

SDA

Digital Input/Output

I2C Data, requires pull up resistor (on host or external)

GPIO0

Digital Input/Output

General Purpose Input/Output 0

GPIO1

Digital Input/Output

General Purpose Input/Output 1

GND

Ground

GPIO2

Digital Input/Output

General Purpose Input/Output 2

GPIO3

Digital Input/Output

General Purpose Input/Output 3

GPIO4

Digital Input/Output

General Purpose Input/Output 4

GPIO5

Digital Input/Output

General Purpose Input/Ou tput 5

GND

Ground

GPIO6

Digital Input/Output

General Purpose Input/Output 6

GPIO7

Digital Input/Output

General Purpose Input/Output 7

VDIG

Analog

Digital Core Decoupling, connect to a 100nF decoupling capacitor

GND

Ground

RESETB

Digital Input

Active Low Reset. Connect to VDD if not used.

VANA

Analog

Analog Core Decoupling, connect to a 100nF decoupling capacitor

CAP0

Analog

Capacitive Sensor 0

32 CAP1 Analog Capacitive Sensor 1

bottom plate

GND

Ground

Exposed pad connec t to grou n d

Table 1 Pin descr ipt ion

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SX8633

Low Power, Capacitive Button Touch Controller (12 sensors)

wi th Enhanc ed LED Drivers and Proximity Sensing

1.4 Simplified Block Diagram

The simplified block diagram of the SX8633 is illustrated in Figure 3.

SX8633

cap2

cap3

cap4

cap5

cap6

cap8

cap7

cap9

gnd

gpio5

gpio4

gpio3

gpio2

gpio1

gnd

gpio0

cap1

cap0

vana

resetb

gnd

gpio7

vdig

gpio6

cap10

cap11

vdd

scl

intb

sda

analog

sensor

interface

micro

processor

RAM

ROM I2C

GPIO

controller

power management

clock

generation

PWM

LED

controller

bottom plate

NVM

Figure 3 Simplified block diagram of the SX8633

1.5 Acronyms

ASI Analog Sensor Interface

DCV Digital Compensation Value

GPI General Purpose Input

GPO General Purpose Output

GPP General Purpose PWM

MTP Multiple Time Programmable

NVM Non Volatile Memory

PWM Pulse Width Modulation

QSM Quick Start Memory

SPM Shadow Parameter Memory

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SX8633

Low Power, Capacitive Button Touch Controller (12 sensors)

wi th Enhanc ed LED Drivers and Proximity Sensing

2 ELECTRICAL CHARACTERISTICS

2.1 Abs ol ute Maximum Ratings

Stresses above the values listed in “Absolute Maximum Ratings” may cause permanent damage to the device.

This is a stress rating only and functional operation of the device at these, or any other conditions beyond the “Recommended

Operating Conditions”, is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device

reliability.

Parameter Symbol Min. Max. Unit

Supply Voltage

VDD

-0.5

3.9

Input voltage (non-supply pins)

-0.5

3.9

Input current (n on-supply pins)

Operating Junction Temperature

JCT

125

°C

Reflow temperature

260

°C

Storage temperature

STOR

-50

150

°C

ESD HBM (Human Body model)(i)

ESD

HBM

Latchup(ii)

± 100

Table 2 Absolute Maximum Ratings

(i) Tested to JEDEC standar d JESD 22-A114

(ii) Tested to JEDEC standar d JES D78

2.2 Recommended Operating Conditions

Parameter Symbol Min. Max. Unit

Supply Voltage

VDD

2.7V

3.6

Supply Voltage Drop(iii, iv, v)

VDD

drop

100

Supply Voltage for NVM programming

VDD

3.6V

3.7

Ambient Temperature Range

-40

°C

Table 3 Recommended Oper at ing Conditions

(iii) Performance for 2.6V < VDD < 2.7V might be degraded.

(iv) Operation is not guaranteed below 2.6V. Should VDD briefly drop below this minimum value, then the SX8633 may

require;

- a hardware reset issued by the host using the RESETB pin

- a software reset issued by the host using the I2C interface

(v) In the event the host processor is reset or undergoes a power OFF/ON c ycle , it is rec ommend ed that t he host also resets

the SX8633 and assures that parameters are re-written into the SPM (should these differ to the parameters held in NVM).

2.3 Thermal Characteristics

Parameter Symbol Min. Max. Unit

Thermal Resistance - Junction to Ambient (vi)

°C/W

Table 4 Thermal Charac terist ics

(vi) Static airflow

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SX8633

Low Power, Capacitive Button Touch Controller (12 sensors)

wi th Enhanc ed LED Drivers and Proximity Sensing

2.4 Electrical Specif icat ions

All values are valid within the operating conditions unless otherwise specified.

Parameter

Symbol

Conditions

Min.

Typ.

Max.

Unit

Current consumption

Active mode, average

OP,active

30ms scan period,

12 sensors enab led,

minimum sensitivity

220

300

Doze mode, average

OP,Doze

195ms scan period,

12 sensors enab led,

minimum sensitivity

110

Sleep

OP,sleep

I2C and GPI listening, sensors

disabled

GPIO, set as Input, RESETB, SCL, SDA

Input logic high

0.7*VDD

VDD + 0.3V

Input logic low

VSS applied to GND pins

VSS - 0.3V

0.8

Input leakage cur rent

CMOS input

±1

Pull up resistor

when enabled

660

kΩ

Pull down resistor

when enabled

660

kΩ

GPIO set as Output, INTB, SDA

Output logic high

<4mA

VDD-0.4

Output logic low

OL,GPIO

<12mA

IOL,SDA,INTB<4mA

0.4

Start-up

Power up time

por

time between risi ng edge VDD

and rising INTB

150

RESETB

Pulse width

res

Recommended External components

Capacitor between VDIG, GND

vdig

type 0402, tolerance +/-50%

100

Capacitor between VANA, GND

vana

type 0402, tolerance +/-50%

100

Capacitor between CP, CN

int

type 0402, COG, tolerance +/-5%

Capacitor between VDD, GND

vdd

type 0402, tolerance +/-50%

270

Table 5 Elect r ical Specifications

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SX8633

Low Power, Capacitive Button Touch Controller (12 sensors)

wi th Enhanc ed LED Drivers and Proximity Sensing

Parameter Symbol Conditions Min. Typ. Max. Unit

I2C Timing Specifications (i)

SCL clock fr equency

fSCL

400

KHz

SCL low period

tLOW

1.3

SCL high period

tHIGH

0.6

Data setup time

tSU;DAT

100

Data hold time

tHD;DAT

Repeated start setup time

tSU;STA

0.6

Start condition hold time

tHD;STA

0.6

Stop condition setup time

tSU;STO

0.6

Bus free time between stop and start

tBUF

500

Input glitch suppr e ssion

tSP

Table 6 I2C Timing Specificat ion

Notes:

(i) All timing specifications, Figure 4 and Figure 5, refer to voltage levels (VIL, VIH, VOL) defined in Table 5.

The interface complies with slave F/S mode as described by NXP: “I2C-bus specification, Rev. 03 - 19 June 2007”

SDA

SCL

tSU;STA tHD;STA tSU;STO tBUF

70%

30%

70%

Figure 4 I2C St ar t and Stop timing

SDA

SCL

LOW

HIGH

HD;DAT

SU;DAT

70%

30%

70%

30%

Figure 5 I 2C Data t iming

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SX8633

Low Power, Capacitive Button Touch Controller (12 sensors)

wi th Enhanc ed LED Drivers and Proximity Sensing

3 FUNCTIONAL DESCRIPTION

3.1 Quickstart Application

The SX8633 is preconfigured (Quickstart Application) for an application with eight buttons and eight LED drivers

using logarithmic P WM fading.

Implem enting a sc hem atic based on Figure 6 will be im mediatel y operational af ter powering with out pr ogr am ming

the SX8633 (even without host).

HOST

SX8633

cap2

cap3

cap4

cap5

cap6

cap8

cap7

cap9

gnd

gpio5

gpio4

gpio3

gpio2

gpio1

gnd

gpio0

cap1

cap0

vana

resetb

gnd

gpio7

vdig

gpio6

cap10

cap11

vdd

scl

intb

sda

analog

sensor

interface

micro

processor

RAM

ROM

NVM

I2C

GPIO

controller

power management

clock

generation

PWM

LED

controller

bottom plate

Figure 6 Quickstart Application

Touching the sensor on the CAP0 pin will enable automatically the LED connected to GPIO0. When the CAP0

sensor is released the LED on GPIO0 will slowly fade-out using smooth logarithmic fading.

All other sensors (CAP1 to CAP11) have their own LED associated on a GPIO pin showing a touch or a release.

The sensor detection and the LED fading described above are operational without any host interaction.

This is made possible using the SX8633 Autolight feature described in the following sections.

3.2 Introduction

3.2.1 General

The SX8633 is intended to be used in applications which require capacitive sensors covered by isolating overlay

material and which need to detect the proximity of a finger/hand though the air. A finger approaching the

capacitive sensors will ch ange the charge th at can b e loade d on the s ensors . The SX8633 m easures the change

of char ge and conver ts th at into d igit al v alu es (tick s) . The larger the char ge on the sens ors, the larg er the n um ber

of ticks will be. The charge to ticks conversion is done by the SX8633 Analog Sensor Interface (ASI).

The ticks are further processed by the SX8633 and converted in a high level, easy to use information for the

user’s host.

The information between SX8633 and the user’s host is passed through the I2C interface with an additional

interrupt signal indicating that the SX8633 has new information. For buttons this information is simply touched or

released.

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Low Power, Capacitive Button Touch Controller (12 sensors)

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3.2.2 GPIOs

A second path of feedback to the user is using General Purpose Input Output (GPIO) pins. The SX8633 offers

eight individual configurable GPIO pins. The GPIO can e.g. be set as a LED driver which slowly fade-in when a

finger touches a button and slowly fade-out when the button is released. Fading intensity variations can be

logarithmic or linear. Interval speed and initial and final light intensity can be selected by the user. The fading is

done using a 256 steps PWM. The SX8633 has eight individual PWM generators, one for each GPIO pin.

The LED fading can be initiated automatically by the SX8633 by setting the SX8633 Autolight feature. A simple

touch on a sensor and the corr es ponding LED will fade-in without any host interac tion over the I2C.

In case the Autolight feature is disa bled t hen th e hos t wil l decid e to st art a LED f ading-i n per iod, sim pl y b y setting

the GP0 pin to ‘high’ using one I2C command. The SX8633 will then slowly fade-in the LED using the PWM

autonomously.

In case th e hos t needs t o h ave full c ontrol of the LED intens it y then the hos t ca n s et the G PIO in GPP mode. T he

host is then able to set the PWM pulse width freely at the expense of an increased I2C occupation.

The GPIOs can be set further in the digital standard Input mode (GPI).

3.2.3 Parameters

The SX8633 has many low level built-in, fixed algorithms and procedures. To allow a lot of freedom for the user

and adapt the SX8633 for different applications these algorithms and procedures can be configured with a large

set of parameters which will be described in the following sections. Examples of parameters are which sensors

are buttons, which GPIO is used for outputs or LEDs and which GPIO is mapped to which button.

Sensitivity and detection thresholds of the sensors are part of these parameters. Assuming that overlay material

and sensors areas are identical then the sensitivities and thresholds will be the same for each sensor. In case

sensors are not of the same size then sensitivities or thresholds might be chosen individually per sensor.

So a smaller size sensor can have a larger sensitivity while a big size sensor may have the lower sensitivity.

3.2.4 Configuration

During a development phase the parameters can be determined and fine tuned by the users and downloaded

over the I2C in a dynamic way. The parameter set can be downloaded over the I2C by the host each time the

SX8633 boots up. This allows a flexible way of setting the parameters at the expense of I2C occupation.

In case the parameters are frozen they can be programmed in Multiple Time Programmable (MTP) Non Volatile

Memory (NVM) on the SX8633. The programming needs to be done once (over the I2C). The SX8633 will then

boot up from the NVM and additional parameters from the host are not required anymore.

In case the host desires to overwrite the boot-up NVM param eters (partly or even complete) this can be done by

additional I2C communications.

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Low Power, Capacitive Button Touch Controller (12 sensors)

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3.3 Scan Period

The basic operation Scan period of the SX8633 sensing interface can be split into three periods over time.

In the first period (Sensing) the SX8633 is sensing all enabled CAP inpu ts , from CAP0 towards CAP11.

In the sec o nd per iod (Processing) the SX8633 proces s es the sensor d ata, verif ie s and up dat es th e G PI O a n d I2C

status registers.

In the third period (Timer) the SX8633 is set in a low power mode and waits until a new cycle starts.

Figure 7 shows the different SX8633 periods over time.

CAP0

CAP1

CAP11

sensing

data

processing

processing timer

CAP0

CAP1

scan period

time

timer

Figure 7 Scan Period

The sc an period det erm ines the m inim um r eaction time of t he SX8633. T he s can per iod can be c onf igure d by the

host from 15ms to values larger than a second.

The reaction time is defined as the interval between a touch on the sensor and the moment that the SX8633

generates the interrupt on the INTB pin. The shorter the scan period the faster the reaction time will be.

Very low power consum ption c an be obtained by settin g very long s can p er io ds with the ex pens e of ha ving lo nger

reaction times.

Important: All external e ve nts like GPIO, I 2C a nd INTB are updated in the proce s sing period, so o nc e e very scan

period. If e.g. a GPI would change sta te directl y after t he processin g period then t his will be r eported with a delay

of one scan period later in time.

3.4 Operation modes

The SX8633 has 3 oper atio n m odes. T he main dif fer enc e is found in the r eact ion tim e ( corr esponding to the s can

period) and power consumption.

Active mode offers fast scan periods. The typical reaction time is 30ms. All enabled sensors are scanned and

information data is processed within this interval.

Doze mode increases the scan period time which increases the reaction time to 195ms typical and at the same

time reduces the opera tin g cur rent .

Sleep mode turns the SX8633 OFF, except for the I2C and GPI peripheral, minimizing operating current while

maintain ing the po wer supplies . In Sleep mode the SX8633 does not do any sensor scanning.

The user can specify other scan periods for the Active and Doze mode and decide for other compromises

between reaction time and power consumption.

In mos t applications the re action tim e needs to be fas t when fing ers ar e present, but can be s lo w when no per son

uses the application. In case the SX8633 is not used for a specific time it can go from Active mode into Doze

mode and p ower wi ll be saved . Th is tim e-out is determ ined by the P assive T imer which ca n be conf igured by the

user or turned OFF if not required.

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Low Power, Capacitive Button Touch Controller (12 sensors)

wi th Enhanc ed LED Drivers and Proximity Sensing

To leave Doze mode and enter Active mode this can be done by a simple touch on any button.

For some applications a single button touch might cause undesired wakening up and Active mode would be

entered too often.

The SX8633 offers therefore a smart wake-up sequence feature in which the user needs to touch and release a

correct sequence of buttons before Active mode will be entered. This is explained in more deta il in t he W ake-Up

Sequence section.

The host can decide to force the operating mode by issuing commands over the I2C (using register

CompOpMode) and take fully control of the SX8633.

The diagram in Figure 8 shows the available operation modes and the possible transitions.

ACTIVE mode

DOZE mode

SLEEP mode

wake-up

sequence

detected

GPI interrupt

I2C cmd

GPI interrupt

I2C cmd I2C cmd

Power On

I2C cmd

passive

timeout

'I2C cmd' - write to CompOpMode[1:0]

Figure 8 Operation modes

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Low Power, Capacitive Button Touch Controller (12 sensors)

wi th Enhanc ed LED Drivers and Proximity Sensing

3.5 Sensors on the PCB

The capac iti ve sens ors ar e relat iv ely simple copper are as on the PCB connec ted t o the SX8633 capacitive se nsor

input pins (CAP0…CAP11).The sensors are covered by isolating overlay material (typically 1mm...3mm). The

area of a sensor is typically one square centimeter which corresponds about to the area of a finger touching the

overlay material.

The capacitive sensors can be setup as ON/OFF buttons for either touch or proximity sensing (see example

Figure 9).

Figure 9 PCB top layer of three touch buttons sensors surrounded by a proximity sensor

Please refer to the layout guidelines application note [1], for more details.

3.6 Button Information

3.6.1 Button Information

The touch buttons have two simple states (see Figure 10): ON (touched by finger) and OFF (released and no

finger press).

off on off off

Figure 10 Buttons

A finger is detected as soon as the number of ticks from the ASI reaches a user-defined threshold plus a

hysteresis.

A release is detected if t he ticks from the ASI go below the threshold minus a h ysteresis. The hysteresis around

the threshold avoids rapid touch and release signaling during transients.

Buttons c an also b e us ed t o do pr oximity sensin g. The principle of pr oximity sensing opera ti on is exac tly the same

as for touch buttons except that proxim ity sens ing is d one several c entimeters above the ov erlay through the air.

ON state means that finger/hand is detected by the sensor and OFF state means the finger/hand is far from the

sensor.

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3.7 Ana l og Sensing Interface

The Analog Sensing Interface (ASI) converts the charge on the sensors into ticks which will be further digitally

processed. The basic princ iple of the ASI will be expla i ned in this sec ti on.

The ASI cons ists of a m ultiplexer select ing the sensor , analog sw itches, a refer enc e voltage, an ADC sigma delt a

converter, an offset compensation DAC and an external integration capacitor (see Figure 11).

switches

cap2

cap6

cap7

cap1

cap0

analog

multi-

plexor

Offset

compensation

DAC

ADC

ticks (raw)

compensation

DCV

ASI processing

Cint

voltage

reference

Figure 11 Analog Sensor Interface

To get the ticks representing the charge on a specific sensor the ASI will execute several steps.

The charge on a sensor ca p (e.g. CAP 0) will b e accu mulated m ultiple tim es on t he externa l integrati on cap acitor,

Cint.

This results in an increasing voltage on Cint proportional to the capacitance on CAP0.

At this stage the offset compensation DAC is enabled. The compensation DAC generates a voltage proportional

to an estimation of the external capacitance. The estimation is obtained by the offset compensation procedure

executed e.g. at power-up.

The difference between the DAC output and the charge on Cint is the desired signal. In the ideal case the

differ ence of charge will be c onverted t o zero tick s if no finger is pres ent and the num ber of ticks becomes high in

case a finger is present.

The difference of charge on Cint and the DAC output will be transferred to the ADC (Sigma Delta Integrator).

After the charge transfer to the ADC the steps above will be repeated.

The larger the number the cycles are repeated the larger the signal out of the ADC with improved SNR. The

sensitivity is therefore directly related to the number of cycles.

The SX8633 allows setting the sensitivity for each sensor individually in applications which have a variety of

sensors sizes or dif fer ent overla ys or for fine-tuning pe rf orm ances. T he optim al sensitivit y is dependi ng heavil y on

the final app lication. If the sensit ivity is too lo w the ticks will n ot pass the thres holds and touc h/proxim ity detection

will not be possible. In case the sensitivity is set too large, some power will be wasted and false touch/proximity

information may be output (ie for touch buttons => finger not touching yet, for proximity sensors => finger/hand not

close enough).

Once the ASI has finished the first sensor, the ticks are stored and the ASI will start measuring the next sensor

until all (enabled) sensors pins have been treated.

In case some sensors are disabled then these result in lower power consumption simply because the ASI is active

for a shorter period and the following processing period will be shorter.

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The ticks from the ASI will then be handled by the digital processing.

3.8 Offset Compensation

The capacitance at the CAP pins is determined by an intrinsic capacitance of the integrated circuit, the PCB

traces, gr ound c oupling a n d the sens or pl anes. This capac it ance is rel ati ve ly large and m ight become easil y som e

tens of pF. This parasitic capacitance will vary only slowly over time due to environmental changes.

A finger touch is in the order of one pF. If the finger approaches the sensor this occurs typically fast.

The ASI has the difficult task to detect and distinguish a small, fast changing capacitance, from a large, slow

varying c apacitance. T his would re quire a ver y pr ecise, high r esolution AD C and com plicated, pow er consu ming,

digital processing.

The SX8633 featur es a 16 bit DAC which c ompensat es for the large, s low var ying cap acitanc e alread y in front of

the ADC. In other words the ADC converts only the desired small signal. In the ideal world the ADC will put out

zero ticks even if the external capacitance is as high as 100pF.

At each power-up of the SX8633 the Di gital Com pensation Values (DCV) are estimated by the digital processing

algorithms. The algorithm will adjust the compensation values such that zero ticks will be generated by the ADC.

Once the correct compensation values are found these will be stored and used to compensate each CAP pin.

If the SX8633 is shut d own the com pensation values w ill be lost. At a next po wer -up the proced ure starts all over

again. T his assures th at the SX8633 w ill operate und er any condit ion. Powering up at e.g. dif ferent temper atures

will not change the performance of the SX8633 and the host does not have to do anything special.

The DCVs do not need to be updated if the external conditions remain stable.

However if e.g. temperature changes this will influence the external capacitance. The ADC ticks will drift then

slowly around zero values basically because of the mismatch of the compensation circuitry and the external

capacitance.

In case the average value of the ticks become higher than the positive noise threshold (configurable by user) or

lower than the negative threshold (configurable by user) then the SX8633 will initiate a compensation procedure

and find a new set of DCVs.

Compensation procedures can as well be initiated by the SX8633 on periodic intervals. Even if the ticks remain

within the positive and negative noise thresholds the compensation procedure will then estimate new sets of

DCVs.

Finall y the h os t can initiate a com pens ation proced ure by using the I2C int erfac e (in Acti ve or Do ze mode). This is

e.g. required after the host changed the sensitivity of sensors.

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3.9 Processing

The firs t process ing step of the r aw tick s, c oming out o f the ASI, is low pas s f iltering to o btain an estim ation of t h e

average capacitance: tick-ave (see Figure 12).

This slowly vary ing average is important in the detection of slowly changing environmental changes.

ticks (raw)

compensation DCV

ASI processing

low pass

tick-diff

tick-ave

processing

GPIO

controller

PWM LED

controller

I2C

SPM

Figure 12 Processing

The difference of the tick average and the raw ticks, tick-diff, is a good estimation of rapid changing input

capacitances.

The tick-diff, tick-ave an d t he c onf ig urat ion par ameters in t he SP M are then proc es sed and determines the sensor

information, I2C registers status and PWM control.

3.10 Configuration

Figure 13 shows the building blocks used for configuring the SX8633.

micro

processor

MTP

NVM

I2C

SX8633

HOST

SPM QSM

Figure 13 Configuration

The default configuration parameters of the SX8633 are stored in the Quick Start Memory (QSM). This

configuration data is setup to a very common application for the SX8633 with eight buttons. Without any

programming or host interaction the SX8633 will startup in the Quick Start Application.

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The QSM settings are fixed and can not be changed by the user.

In case the application needs different settings than the QSM settings then the SX8633 can be setup and/or

programmed over the I2C interface.

The configuration parameters of the SX8633 can be stored in the Multiple Time Programmable (MTP) Non

Volatile Memory (NVM). The NVM contains all those parameters that are defined and stable for the application.

Examples are the number of sensors enabled, sensitivity, active and Doze scan period. The details of these

parameters are described in the next chapters.

At power up the SX8633 checks if the NVM contains valid data. In that case the configuration param eter source

becom es the NV M. If the N VM is em pt y or non-va lid t hen t he co nfigurat ion s ource becom es t he QSM. In t he nex t

step the SX8633 copies the configuration param eter source (QSM or NVM) into the Shad ow Parameter M emory

(SPM). The SX8633 is operational and uses the configuration parameters of the SPM.

During p o wer do wn or res e t e vent th e SPM los es a ll c onte nt. I t w ill a utomatical ly be r e loa ded (f r om Q SM or NVM)

following power up or at the end of the reset event.

The host will interface with the SX8633 through the I2C bus.

The I2C of the SX8633 consists of 16 registers. Some of these I2C registers are used to read the status and

information of the button. Other I2C registers allow the host to take control of the SX8633. The host can e.g.

decide to change the operation mode from Active mode to Doze mode or go into Sleep (according to Figure 8).

Two additional modes allow the host to have an access to the SPM or indirect access to the NVM.

These modes are required during development, can be used in real time or in-field programming.

Figure 14 shows the Host SPM mode. In this mode the host can decide to overwrite the SPM. This is useful

during the d evelo pment phases of the applic ati on whe re the c onf iguration parameters ar e not yet ful ly def ine d and

as well during the operation of the application if some parameters need to be changed d ynamicall y.

micro

processor

MTP

NVM

I2C

SX8633

HOST

SPM

Figure 14 Host SPM mode

The cont ent of the S PM re mains valid as long as the SX8633 is powered a nd no r eset is performed. After a po wer

down or reset the host needs to re-write the SPM if relevant for the application.

Figure 15 shows the Host NVM mode. In this mode the host will be able to write the NVM.

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MTP

NVM

I2C

SX8633

HOST

SPM

Figure 15 Host NVM mode

The writing of the host towards the NV M is not done directly but done in 2 steps (Figure 15).

In the first step the host writes to the SPM (as in Figure 14). In the second step the host signals the SX8633 to

copy the SPM content into the NVM.

Initially the NVM memory is empty and it is required to determine a valid parameter set for the application. This

can be done during the development phase using dedicated evaluation hardware representing the final

application. This development phase uses probably initially the host SPM mode which allows faster iterations.

Once the p arameter set is determ ined this c an be written t o the NVM over the I2C us ing the 2 steps approa ch by

the host or a dedicated programmer for large volumes production (as described in the paragraphs 6.6 and 6.7).

3.11 Power Management

The SX8633 uses on-chip voltage regulators which are controlled by the on-chip m icroprocessor. The regulators

need to be stabilized with an external capacitor between VANA and ground and between VDIG and ground (see

Table 5). Both regulators are designed to only drive the SX8633 internal circuitry and must not be loaded

externally.

3.12 Clock Circuitry

The SX8633 has its own internal clock generation circuitry that does not require any external components. The

clock circuitry is optimized for low power operation and is controlled by the on-chip microprocessor. The typical

operating frequency of the oscillating core is 16.7MHz from which all other lower frequencies are derived.

3.13 I2C interface

The I2C interface allows the communication between the host and the SX8633.

The I2C slave implemented on the SX8633 is compliant with the standard (100kb/s) and fast mode (400kb/s)

The default SX8633 I2C address equals 0b010 1011.

A different I2C address can be programmed by the user in the NVM.

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3.14 Reset

The reset can be performed by 3 sources:

- power up,

- RESETB pin,

- software reset.

3.14.1 Power up

During power up the INTB is kept low. Once the power up sequence is terminated the INTB is released

autonomously. The SX8633 is then ready for operation.

VDD

INTB

time

VDD

t por

supply

voltage

VDDmin

time

SX8633 ready

Figure 16 Pow er Up vs. INTB

During the po wer on p er iod t he SX8633 stabi lizes th e i nternal regula tors , RC clocks and the f ir mware initial iz es all

registers.

During the power up the SX8633 is not accessible and I2C communications are forbidden.

As soon as the INTB rises the SX8633 will be ready for I2C communication.

3.14.2 RESETB

When RESETB is driven low the SX8633 will reset and start the power up sequence as soon as RESETB is

driven high or pulled high.

In case the user does not require a hardware reset control pin then the RESETB pin can be connected to VDD.

VDD

t res

RESETB

time

SX8633 startup

VDD

INTB

time

t por

SX8633 ready

Figure 17 Hardware Reset

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3.14.3 Software Reset

To perform a software reset the host needs to write 0xDE followed by 0x00 at the SoftReset register at address

0xB1.

SoftReset

time

SX8633 startup

VDD

INTB

time

por

SX8633 ready

0xDE 0x00

Figure 18 Sof t ware Reset

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3.15 Interrupt

3.15.1 Power up

During power up the INTB is kept low. Once the power up sequence is terminated the INTB is released

autonomously. The SX8633 is then ready for operation.

VDD

INTB

time

VDD

t por

supply

voltage

VDDmin

time

SX8633 ready

Figure 19 Pow er Up vs. INTB

During the po wer on p er iod t he SX8633 stabi lizes th e i nternal regula tors , RC clocks and the f ir mware initial iz es all

registers.

During the power up the SX8633 is not accessible and I2C communications are forbidden.

As soon as the INTB rises the SX8633 will be ready for I2C communication.

3.15.2 Assertion

INTB is updated in Active or Doze mode once every scan period.

The INTB will be asserted: at the following events:

• if a Button e vent occurred ( touch or release if enab led). I2C regist er CapStatLsb show the detailed s tatus of

the Buttons,

• if a GPI edge occ urred (rising or falling if enab led). I2C register GpiStat s hows the det ailed status of the GPI

pins,

• when actually entering Active or Doze mode either through automatic wakeup or via host request (may be

delayed by 1 scan period). I2C register CompOpmode shows the current operation mode,

• once compensation procedure is completed either through automatic trigger or via host request (may be

delayed by 1 scan period),

• once SPM write is effective (may be delayed by 1 scan period),

• once NVM burn procedure is completed (may be delayed by 1 scan period),

• during reset (power up, hardware RESETB, software reset).

3.15.3 Clearing

INTB is updated in Active or Doze mode once every scan period.

The clearing of the INTB is done as soon as the host performs a read to the IrqSrc I2C register or reset is

completed.

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3.15.4 Example

A typical example of the assertion and clearing of the INTB and the I2C communication is shown in Figure 20.

off on on off

INTB

time

I2C

read read

Figure 20 I nt errupt and I2C

When a button is touched the SX8633 will assert the interrupt (1). The host will read the IrqSrc information over

the I2C and this clears the interrupt (2).

If the f inger r eleases the bu tton the inter ru pt will be as s er ted ( 3). The host reading the Ir qSrc inf orm ation wil l clear

the interrupt (4).

In case the host does not react to an interrupt this results in a missing touch.

3.16 General Purpose Input and Outputs

3.16.1 Introduction and Definitions

The SX8633 off ers eight General P urpos e Inp ut a nd O utputs ( GPIO ) p ins whic h can be c o nf igur e d i n any of these

modes:

- GPI (General Purpose Input)

- GPP (General Pur p ose P WM)

- GPO (General Purpose Output)

Each of these modes is described in more details in the following sections.

The polarit y of the GPP and GPO pins is defined as in figure below, driving an LED as example. It has to be set

accordingly in SPM parameter GpioPolarity.

gpio

vdd

(a) (b)

Figure 21 Po lar it y definition, (a) normal, (b) inverted

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The PWM blocks used in GPP and GPO modes are 8-bits based and clocked at 2MHz typ. hence offering 256

selectable pulse width values with a granularity of 128us typ.

time

VDD

(a)

period

width

time

VDD

(b)

period

width

Figure 22 PWM definition, (a) small pulse width, (b) large pulse width

3.16.2 GPI

GPIOs configured as GPI will operate as digital inputs with standard low and high logic levels.

Optional pull-up/down and debounce can be enabled. Each GPI is individually edge programmable for INTB

generation which will also exit Sleep/Doze mode if relevant.

SPM/I2C parameters applicable in GPI mode are listed in table below. Please refer to the relevant SPM/I2C

parameters sections for more details.

GPI

SPM

GpioMode

GpioPullUpDown

GpioInterrupt

GpioDebounce

I2C

IrqSrc[4]

GpiStat

Table 7 SPM/I2C Param eters Applicable in GPI Mode

3.16.3 GPP

GPIOs configured as GPP will operate as PWM outputs directly controlled by the host. A typical application is

LED dimm ing.

Typical GPP operation is illustrated in figure below.

I2C

0% 50% 100%

SX8633HOST SX8633HOST

GppIntensity = 0x7F

I2C

GppIntensity = 0xFF

Figure 23 LED control in GPP mode

SPM/I2C parameters applicable in GPP mode are listed in table below. Please refer to the relevant SPM/I2C

parameters sections for more details.

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GPP

SPM

GpioMode

GpioOutPwrUp

GpioPolarity

GpioIntensityOn

GpioIntensityOff

GpioFunction

I2C

GppPinId

GppIntensity

1 At power up, GppIntensity of each GPP pin is initialized with GpioIntensityOn or Gpi oIntensityOff depending on GpioOutPwrUp

corresponding bits value.

Table 8 SPM/I2C Param eters Applicable in GPP Mode

3.16.4 GPO

GPIOs configured as GPO will operate as digital outputs which can generate both standard low/high logic levels

and PWM low/high duty cycles levels. Typical application is LED ON/OFF control.

Transitions between ON and OFF states can be triggered either automatically in Autolight mode or manually by

the host. This is illustrated in figures below.

I2C

OFF ON OFF

SX8633HOST SX8633HOST

GpoCtrl = 1

I2C

GpoCtrl = 0

Figure 24 LED Control in GPO mode, Autolight OFF

OFF ON OFF

Figure 25 LED Control in GPO mode, Autolight ON (mapped to Button)

Addition ally these tra nsitions c an be configured to be done with or without fadin g following a logarithm ic or linear

function. This is illustrated in figures below.

time

PWM pulse width

intensity ON

intensity OFF

fading steps

inc. time

time

intensity ON

intensity OFF

fading steps

inc. time

(a) (b)

trigger trigger

PWM pulse width

Figure 26 G PO O N transition (LED fade in), normal polarity, (a) linear, (b) logarithmic

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time

intensity ON

intensity OFF

fading steps

inc. time

time

intensity ON

intensity OFF

fading steps

inc. time

(a) (b)

trigger trigger

PWM pulse width

Figure 27 G PO O N transition (LED fade in), inverted polarity, (a) linear, (b) logarithmic

The fading o ut (e.g. af ter a button is release d) is ident ical to the f ading in bu t an addit ional off delay can b e added

before the fading starts (Figure 28 and Figure 29).

intensity OFF

intensity ON

fading steps

dec. time

trigger time time

intensity OFF

intensity ON

fading steps

(b)

trigger

off delay

dec. time

off delay

PWM pulse width

Figure 28 G PO O FF transition (LED fade out), normal polarity, (a) linear, (b) logarithmic

time

intensity OFF

intensity ON

fading steps

dec. time

(a)

trigger time

intensity OFF

intensity ON

fading steps

dec. time

(b)

trigger

off delay

PWM pulse width

Figure 29 G PO O FF transition (LED fade out), inverted polarity, (a) linear, (b) logarithmic

Please n ote tha t stan dard high/l ow log ic sig nals are ju st a spec ific c ase of G PO m ode and c an a lso be g ener ated

simply by setting inc/dec time to 0 (ie OFF) and programming intensity OFF/ON to 0x00 and 0xFF.

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SPM/I2C parameters applicable in GPO mode are listed in table below.

GPO

SPM

GpioMode

GpioOutPwrUp

GpioAutoligth

GpioPolarity

GpioIntensityOn

GpioIntensityOff

GpioFunction

GpioIncFactor

GpioDecFactor

GpioIncTime

GpioDecTime

GpioOffDelay

I2C

GpoCtrl

1 Only if Autolight is OFF, else must be left to 0 (default value)

2 Only if Autolight is OFF, else ignored

Table 9 SPM/I2C Param eters Applicable in GPO Mode

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3.16.5 Intensity index vs PWM pulse width

Tables below are used to convert all intensity indexes parameters GpioIntensityOff, GpioIntensityOn and

GppIntensity but also to generate fading in GPO mode

During fading in(out), the index is automatically incremented(decremented) at every Inc(Dec)Time x

Inc(Dec)Factor until it reaches the programmed GpioIntensityOn(Off) value.

Index

Lin/Log

Index

Lin/Log

Index

Lin/Log

Index

Lin/Log

Index

Lin/Log

Index

Lin/Log

Index

Lin/Log

Index

Lin/Log

0/0

33/5

65/12

97/26

128

129/48

160

161/81

192

193/125

224

225/184

2/0

34/5

66/13

98/27

129

130/49

161

162/82

193

194/127

225

226/186

3/0

35/5

67/13

99/27

130

131/50

162

163/83

194

195/129

226

227/188

4/0

36/5

68/13

100/28

131

132/51

163

164/84

195

196/130

227

228/190

5/0

37/5

69/14

100

101/29

132

133/52

164

165/86

196

197/132

228

229/192

6/2

38/6

70/14

101

102/29

133

134/53

165

166/87

197

198/133

229

230/194

7/2

39/6

71/14

102

103/30

134

135/54

166

167/88

198

199/135

230

231/197

8/2

40/6

72/15

103

104/30

135

136/55

167

168/89

199

200/137

231

232/199

9/2

41/6

73/15

104

105/31

136

137/55

168

169/91

200

201/139

232

233/201

10/2

42/6

74/15

105

106/32

137

138/56

169

170/92

201

202/140

233

234/203

11/2

43/7

75/16

106

107/32

138

139/57

170

171/93

202

203/142

234

235/205

12/2

44/7

76/16

107

108/33

139

140/58

171

172/95

203

204/144

235

236/208

13/2

45/7

77/16

108

109/33

140

141/59

172

173/96

204

205/146

236

237/210

14/2

46/7

78/17

109

110/34

141

142/60

173

174/97

205

206/147

237

238/212

15/3

47/7

79/17

110

111/35

142

143/61

174

175/99

206

207/149

238

239/215

16/3

48/8

80/18

111

112/35

143

144/62

175

176/100

207

208/151

239

240/217

17/3

49/8

81/18

112

113/36

144

145/63

176

177/101

208

209/153

240

241/219

18/3

50/8

82/19

113

114/37

145

146/64

177

178/103

209

210/155

241

242/221

19/3

51/8

83/19

114

115/38

146

147/65

178

179/104

210

211/156

242

243/224

20/3

52/9

84/20

115

116/38

147

148/66

179

180/106

211

212/158

243

244/226

21/3

53/9

85/20

116

117/39

148

149/67

180

181/107

212

213/160

244

245/229

22/3

54/9

86/21

117

118/40

149

150/68

181

182/109

213

214/162

245

246/231

23/3

55/9

87/21

118

119/40

150

151/69

182

183/110

214

215/164

246

247/233

24/4

56/10

88/22

119

120/41

151

152/71

183

184/111

215

216/166

247

248/236

25/4

57/10

89/22

120

121/42

152

153/72

184

185/113

216

217/168

248

249/238

26/4

58/10

90/23

121

122/43

153

154/73

185

186/114

217

218/170

249

250/241

27/4

59/10

91/23

122

123/44

154

155/74

186

187/116

218

219/172

250

251/243

28/4

60/11

92/24

123

124/44

155

156/75

187

188/117

219

220/174

251

252/246

29/4

61/11

93/24

124

125/45

156

157/76

188

189/119

220

221/176

252

253/248

30/4

62/11

94/25

125

126/46

157

158/77

189

190/121

221

222/178

253

254/251

31/4

63/12

95/25

126

127/47

158

159/78

190

191/122

222

223/180

254

255/253

32/5

64/12

96/26

127

128/48

159

160/80

191

192/124

223

224/182

255

256/256

Table 10 Intensity index vs. PWM pulse width (normal polarity)

Index

Lin/Log

Index

Lin/Log

Index

Lin/Log

Index

Lin/Log

Index

Lin/Log

Index

Lin/Log

Index

Lin/Log

Index

Lin/Log

256/256

224/251

192/244

160/230

128

128/208

160

96/175

192

64/131

224

32/72

255/256

223/251

191/243

159/229

129

127/207

161

95/174

193

63/129

225

31/70

254/256

222/251

190/243

158/229

130

126/206

162

94/173

194

62/127

226

30/68

253/256

221/251

189/243

157/228

131

125/205

163

93/172

195

61/126

227

29/66

252/256

220/251

188/242

100

156/227

132

124/204

164

92/170

196

60/124

228

28/64

251/254

219/250

187/242

101

155/227

133

123/203

165

91/169

197

59/123

229

27/62

250/254

218/250

186/242

102

154/226

134

122/202

166

90/168

198

58/121

230

26/59

249/254

217/250

185/241

103

153/226

135

121/201

167

89/167

199

57/119

231

25/57

248/254

216/250

184/241

104

152/225

136

120/201

168

88/165

200

56/117

232

24/55

247/254

215/250

183/241

105

151/224

137

119/200

169

87/164

201

55/116

233

23/53

246/254

214/249

182/240

106

150/224

138

118/199

170

86/163

202

54/114

234

22/50

245/254

213/249

181/240

107

149/223

139

117/198

171

85/161

203

53/112

235

21/48

244/254

212/249

180/240

108

148/223

140

116/197

172

84/160

204

52/110

236

20/46

243/254

211/249

179/239

109

147/222

141

115/196

173

83/159

205

51/109

237

19/44

242/253

210/249

178/239

110

146/221

142

114/195

174

82/157

206

50/107

238

18/41

241/253

209/248

177/238

111

145/221

143

113/194

175

81/156

207

49/105

239

17/39

240/253

208/248

176/238

112

144/220

144

112/193

176

80/155

208

48/103

240

16/37

239/253

207/248

175/237

113

143/219

145

111/192

177

79/153

209

47/101

241

15/35

238/253

206/248

174/237

114

142/218

146

110/191

178

78/152

210

46/100

242

14/32

237/253

205/247

173/236

115

141/218

147

109/190

179

77/150

211

45/98

243

13/30

236/253

204/247

172/236

116

140/217

148

108/189

180

76/149

212

44/96

244

12/27

235/253

203/247

171/235

117

139/216

149

107/188

181

75/147

213

43/94

245

11/25

234/253

202/247

170/235

118

138/216

150

106/187

182

74/146

214

42/92

246

10/23

233/252

201/246

169/234

119

137/215

151

105/185

183

73/145

215

41/90

247

9/20

232/252

200/246

168/234

120

136/214

152

104/184

184

72/143

216

40/88

248

8/18

231/252

199/246

167/233

121

135/213

153

103/183

185

71/142

217

39/86

249

7/15

230/252

198/246

166/233

122

134/212

154

102/182

186

70/140

218

38/84

250

6/13

229/252

197/245

165/232

123

133/212

155

101/181

187

69/139

219

37/82

251

5/10

228/252

196/245

164/232

124

132/211

156

100/180

188

68/137

220

36/80

252

4/8

227/252

195/245

163/231

125

131/210

157

99/179

189

67/135

221

35/78

253

3/5

226/252

194/244

162/231

126

130/209

158

98/178

190

66/134

222

34/76

254

2/3

225/251

193/244

161/230

127

129/208

159

97/176

191

65/132

223

33/74

255

0/0

Table 11 Int ens ity index vs. PWM pulse width (inverted polarity)

Recommended/default settings are inverted polarity (to take advantage from high sink current capability) and

logarithmic mode (due to the non-linear response of the human eye).

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3.17 Smart Wake Up

The SX8633 offers a sm art wake up mechanism (up t o 6 ke ys) which allows waking-up from the Doze low power

mode to the Active mode in a secure/controlled way and not by any unintentional sensor activation.

Until the full correct wake-up sequence is entered, the SX8633 will rem ain in Doze mode. Any wrong ke y implies

the whole sequence to be entered again.

Please note that each key touch must be followed by a release to be validated.

Hence if a proximity sensor and a touch button part of the wake-up sequence are interleaved on the PCB (ie if you

cannot touch the button without triggering proximity detection) the smart wake up feature cannot be used since

the proximity sensor is not “released” before the buttons are touched. In this case the smart wakeup sequence

must be turned OFF.

The smart wake-up mechanism can also be disabled which implies that Doze mode can hence only be exited

from GPI or I2C command.

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4 PIN DESCRIPTIONS

4.1 Introduction

This chapter describes briefly the pins of the SX8633, the way the pins are protected, if the pins are analog,

digital, require pull up or pull down resistors and show control signals if these are available.

4.2 ASI pins

CAP0, CAP1, ..., CAP11

The capac itance sens or pins (CAP0, CA P1, ..., CAP11) ar e connected direct ly to the ASI circu itry which c onverts

the sensed capacitance into digital values.

The capacitance sensor pins which are not used should be left open.

The enabled CAP pins need be connected directly to the sensors without significant resistance (typical below

some ohms, connection vias are allowed).

The capacitance sensor pins are protected to VANA and GROUND.

Figure 30 shows the simplified diagram of the CAP0, CAP1, ..., CAP11 pins.

SX8633

sensor

ASI

CAPx

CAP_INx

VANA

Note : x = 0, 1,2,…11

Figure 30 S im plified diagram of CAP0, CAP1, ..., CAP11

CN, CP

The CN and the C P pins are connec ted to th e ASI circuitr y. A 1nF sam pling c apac itor betw een CP an d CN needs

to be placed as close as possible to the SX8633.

The CN and CP are protected to VANA and GROUND.

Figure 31 shows the simplified diagram of the CN and CP pins.

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SX8633

ASI

VANA

Figure 31 S im plified diagram of CN and CP

4.3 Host interface pins

The host interface consists of the interrupt pin INTB, a reset pin RESETB and the standard I2C pins: SCL and

SDA.

INTB

The INTB pin is an open drain output that requires an external pull-up resistor (1..10 kOhm). The INTB pin is

protected to VDD using dedicated devices. The INTB pin has diode protected to GROUND.

Figure 32 shows a simplified diagram of the INTB pin.

VDD

R_INT

INTB

SX8633

INT

to host

Figure 32 S im plified diagram of INTB

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SCL

The SCL pi n is a high impedance in put p in. T he SCL pin is pr o tec ted to V DD , us ing de dic a ted de v ices , in or d er to

conform to standard I2C slave specifications. The SCL pin has diode protected to GROUND.

An external pull-up resistor (1..10 kOhm) is required on this pin.

Figure 33 shows the simplified diagram of the SCL pin.

VDD

R_SCL

SCL

SX8633

from host

SCL_IN

Figure 33 S im plified diagram of SCL

SDA

SDA is an IO pin that can be used as an open drain output pin with external pull-up resistor or as a high

impedance input pin. The SDA IO pin is protected to VDD, using dedicated devices, in order to conform to

standard I2C slave specifications. The SDA pin has diode protected to GROUND.

An external pull-up resistor (1..10 kOhm) is required on this pin.

Figure 34 shows the simplified diagram of the SDA pin.

VDD

R_SDA

SDA

SX8633

SDA_OUT

from/to host

SDA_IN

Figure 34 S im plified diagram of SDA

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RESETB

The RESETB pin is a high impedance input pin. The RESETB pin is protected to VDD using dedicated devices.

The RESETB pin has diode protected to GROUND.

Figure 35 shows the simplified diagram of the RESETB pin controlled by the host.

VDD

R_RESETB

RESETB

SX8633

from host

RESETB_IN

Figure 35 S im plified diagram of RESETB controlled by host

Figure 36 shows the RESETB without host control.

VDD

RESETB

SX8633

RESETB_IN

Figure 36 S im plified diagram of RESETB without host control

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4.4 Power management pins

The power management pins consist of the Power, Ground and Regulator pins.

VDD

VDD is a power pin and is the main power supply for the SX8633.

VDD has protection to GROUND.

Figure 37 shows a simplified diagram of the VDD pin.

VDD

SX8633

VDD

Figure 37 S im plified diagram of VDD

GND

The SX8633 has four ground pins all nam ed GND . These pins and the package c enter pad ne ed to b e connec ted

to ground pot ent ial .

The GND has protection to VDD.

Figure 38 shows a simplified diagram of the GND pin.

VDD

SX8633

GND

Figure 38 S im plified diagram of GND

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VANA, V DI G

The SX8633 has on-chip regulators for internal use (pins VA NA a nd VDIG).

VANA and VDIG have protection to VDD and to GND.

The output of the regulators needs to be de-coupled with a small 100nF capacitor to ground.

Figure 39 shows a simplified diagram of the VANA and VDIG pin.

VDD

SX8633

GND

VDIG

VDD

GND

VANA

VDIG

Cvdig

Cvana

Figure 39 S im plified diagram of VANA and VDIG

4.5 General purpose IO pins

The SX8633 has 8 General purpose input/output (GPIO) pins.

All the GPIO pins have protection to VDD and GND.

The GPIO pins can be configured as GPI, GPO or GPP.

Figure 40 shows a simplified diagram of the GPIO pins.

SX8633

VDD Rup

ctrl

Rdown

GPIO7...0

ctrl

GPO,

GPP

VDD

PWM

GPI

GPO,

GPP

VDD

Figure 40 S im plified diagram of GPIO pins

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5 DETAILED CONFIGUR ATION DESCRIPTIONS

5.1 Introduction

The SX8633 configuration parameters are tak en fr om the QSM or the N VM and l oade d i nto th e S PM as explained

in the chapter ‘functional description’.

This chapter describes the details of the configuration parameters of the SX8633.

The SPM is split by functionality into 5 configuration sections:

• General section: operating modes,

• Capaciti ve Sens or s section: related to lower level capacitive sensing,

• Button: related to the conversion from sensor data towards button information,

• Mapping: related to mapping of button information towards wake-up and GPIO pins,

• GPIO: related to the setup of the GPIO pins.

The total address space of the SPM and the NVM is 128 bytes, from address 0x00 to address 0x7F.

Two types of memory addresses, data are accessible to the user.

• ‘application data’: Application dependent data that need to be configured by the user.

• ‘reserved’: Data that need to be maintained by the user to the QSM default values (i.e. when NVM is burned).

The Table 12 and Table 13 resume the complete SPM address space and show the ‘application data’ and

‘reserved’ addresses, the functional split and the default values (loaded from the QSM).

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Address Name default QSM

value Address Name default QSM

value

0x00

Reserved

0xxx

0x20

Reserved

0x00

0x01 Reserved 0xxx 0x21

Button

BtnCfg 0x30

0x02 Reserved 0x09 0x22 BtnAvgThresh 0x50

0x03 Reserved 0xxx 0x23 BtnCompNegThresh 0x50

0x04

General

I2CAddress

0x2B

0x24

BtnCompNegCntMax

0x01

0x05

ActiveScanPeriod

0x02

0x25

BtnHysteresis

0x0A

0x06 DozeScanPeriod 0x0D 0x26 BtnStuckAtTimeout 0x00

0x07 PassiveTimer 0x00 0x27 Reserved 0x00

0x08 Reserved 0x00 0x28 Reserved 0x00

0x09

Capacitive Sensors

CapModeMisc 0x01 0x29 Reserved 0x00

0x0A

CapMode11_8

0x55

0x2A

Reserved

0xFF

0x0B CapMode7_4 0x55 0x2B Reserved 0x00

0x0C CapMode3_0 0x55 0x2C Reserved 0x00

0x0D CapSensitivity0_1 0x00 0x2D Reserved 0x00

0x0E CapSensitivity2_3 0x00 0x2E Reserved 0x00

0x0F

CapSensitivity4_5

0x00

0x2F

Reserved

0x00

0x10 CapSensitivity6_7 0x00 0x30 Reserved 0x00

0x11 CapSensitivity8_9 0x00 0x31 Reserved 0x00

0x12 CapSensitivity10_11 0x00 0x32 Reserved 0x00

0x13

CapThresh0

0xA0

0x33

Mapping

MapWakeupSize

0x00

0x14

CapThresh1

0xA0

0x34

MapWakeupValue0

0x00

0x15

CapThresh2

0xA0

0x35

MapWakeupValue1

0x00

0x16 CapThresh3 0xA0 0x36 MapWakeupValue2 0x00

0x17 CapThresh4 0xA0 0x37 MapAutoLight0 0x76

0x18 CapThresh5 0xA0 0x38 MapAutoLight1 0x54

0x19

CapThresh6

0xA0

0x39

MapAutoLight2

0x32

0x1A CapThresh7 0xA0 0x3A MapAutoLight3 0x10

0x1B CapThresh8 0xA0 0x3B MapAutoLightGrp0Msb 0x00

0x1C CapThresh9 0xA0 0x3C MapAutoLightGrp0Lsb 0x00

0x1D CapThresh10 0xA0 0x3D MapAutoLightGrp1Msb 0x00

0x1E

CapThresh11

0xA0

0x3E

MapAutoLightGrp1Lsb

0x00

0x1F CapPerComp 0x00 0x3F Reserved 0x00

Table 12 SPM address map: 0x00…0x3F

Note

• ‘0xxx’: write protected data

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Address Name default QSM

value Address Name

default QSM

value

0x40

Gpio

GpioMode7_4

0x00

0x60

Gpio

GpioDecTime1_0

0x44

0x41 GpioMode3_0 0x00 0x61 GpioOffDelay7_6 0x00

0x42 GpioOutPwrUp 0x00 0x62 GpioOffDelay5_4 0x00

0x43 GpioAutoLight 0xFF 0x63 GpioOffDelay3_2 0x00

0x44 GpioPolarity 0x00 0x64 GpioOffDelay1_0 0x00

0x45

GpioIntensityOn0

0xFF

0x65

GpioPullUpDown7_4

0x00

0x46 GpioIntensityOn1 0xFF 0x66 GpioPullUpDown3_0 0x00

0x47 GpioIntensityOn2 0xFF 0x67 GpioInterrupt7_4 0x00

0x48 GpioIntensityOn3 0xFF 0x68 GpioInterrupt3_0 0x00

0x49

GpioIntensityOn4

0xFF

0x69

GpioDebounce

0x00

0x4A

GpioIntensityOn5

0xFF

0x6A

Reserved

0x00

0x4B

GpioIntensityOn6

0xFF

0x6B

Reserved

0x00

0x4C GpioIntensityOn7 0xFF 0x6C Reserved 0x00

0x4D GpioIntensityOff0 0x00 0x6D Reserved 0x00

0x4E GpioIntensityOff1 0x00 0x6E Reserved 0x00

0x4F

GpioIntensityOff2

0x00

0x6F

Reserved

0x50

0x50 GpioIntensityOff3 0x00 0x70 CapProxEnable 0x46

0x51 GpioIntensityOff4 0x00 0x71 Reserved 0x10

0x52 GpioIntensityOff5 0x00 0x72 Reserved 0x45

0x53 GpioIntensityOff6 0x00 0x73 Reserved 0x02

0x54

GpioIntensityOff7

0x00

0x74

Reserved

0xFF

0x55 Reserved 0xFF 0x75 Reserved 0xFF

0x56 GpioFunction 0x00 0x76 Reserved 0xFF

0x57 GpioIncFactor 0x00 0x77 Reserved 0xD5

0x58 GpioDecFactor 0x00 0x78 Reserved 0x55

0x59

GpioIncTime7_6

0x00

0x79

Reserved

0x55

0x5A

GpioIncTime5_4

0x00

0x7A

Reserved

0x7F

0x5B GpioIncTime3_2 0x00 0x7B Reserved 0x23

0x5C GpioIncTime1_0 0x00 0x7C Reserved 0x22

0x5D GpioDecTime7_6 0x44 0x7D Reserved 0x41

0x5E

GpioDecTime5_4

0x44

0x7E

Reserved

0xFF

0x5F GpioDecTime3_2 0x44 0x7F SpmCrc* 0x61

Table 13 SPM address map: 0x40…0x7F

Note*

• SpmCrc: CRC depending on SPM content, updated in Active or Doze mode.

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5.2 General Parameters

General Parameters

Address Name Bits Description

0x04

I2CAddress

Reserved

6:0

Defines the I2C address (default 0x2B).

The I2C address will be active after a reset.

0x05

ActiveScanPeriod

7:0

Active Mode Scan Period (Figure 7)

0x00: Reserved

0x01: 15ms

0x02: 30ms (default)

…

0xFF: 255 x 15ms

0x06

DozeScanPeriod

7:0

Doze Mode Scan Period (Figure 7)

0x00: Reserved

0x01: 15ms

…

0x0D: 195ms (default)

…

0xFF: 255 x 15ms

0x07

PassiveTimer

7:0

Passive Timer on Button Information (Figure 8)

0x00: OFF (default)

0x01: 1 second

…

0xFF: 255 seconds

Table 14 Gener al Param eter s

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5.3 Capacitive Sensors Parameters

Capacitive Sensors Parameters

Address Name Bits Description

0x09

CapModeMisc

7:3

Reserved

2:0

IndividualSensitivity

Defines common sensitivity for all sensors or individual

sensor sen si tiv i ty .

001: Common settings (CapSensitivity0_1[7:4])

100: Individual CAP sensitivity settings (CapSensitivityx_x)

Else : Reserved

0x0A

CapMode11_8

7:6

CAP11 Mode

Defines the mode of

the CAP pin.

00: Disabled

01: Button

10: Reserved

11: Reserved

Default

Button

5:4

CAP10 Mode

Button

3:2

CAP9 Mode

Button

1:0

CAP8 Mode

Button

0x0B

CapMode7_4

7:6

CAP7 Mode

Button

5:4

CAP6 Mode

Button

3:2

CAP5 Mode

Button

1:0

CAP4 Mode

Button

0x0C

CapMode3_0

7:6

CAP3 Mode

Button

5:4

CAP2 Mode

Button

3:2

CAP1 Mode

Button

1:0

CAP0 Mode

Button

0x0D

CapSensitivity0_1

7:4

CAP0 Sensitivity - Common Sensitivity

Defines the sensitivity.

0x0: Minimum (default)

0x7: Maximum

0x8… 0xF: Reserved

3:0

CAP1 Sensitivity

0x0E

CapSensitivity2_3

7:4

CAP2 Sensitivity

3:0

CAP3 Sensitivity

0x0F

CapSensitivity4_5

7:4

CAP4 Sensitivity

3:0

CAP5 Sensitivity

0x10

CapSensitivity6_7

7:4

CAP6 Sensitivity

3:0

CAP7 Sensitivity

0x11

Reserved

7:4

CAP8 Sensitivity

3:0

CAP9 Sensitivity

0x12

Reserved

7:4

CAP10 Sensitivity

3:0

CAP11 Sensitivity

0x13

CapThresh0

7:0

CAP0 Touch Threshold

Defines the Touch Threshold ticks.

0x00: 0,

0x01: 4,

…

0xA0: 640 (default),

…

0xFF: 1020

0x14

CapThresh1

7:0

CAP1 Touch Threshold

0x15

CapThresh2

7:0

CAP2 Touch Threshold

0x16

CapThresh3

7:0

CAP3 Touch Threshold

0x17

CapThresh4

7:0

CAP4 Touch Threshold

0x18

CapThresh5

7:0

CAP5 Touch Threshold

0x19

CapThresh6

7:0

CAP6 Touch Threshold

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Capacitive Sensors Parameters

Address Name Bits Description

0x1A

CapThresh7

7:0

CAP7 Touch Threshold

0x1B

CapThresh8

7:0

CAP8 Touch Threshold

0x1C

CapThresh9

7:0

CAP9 Touch Threshold

0x1D

CapThresh10

7:0

CAP10 Touch Threshold

0x1E

CapThresh11

7:0

CAP11 Touch Threshold

0x1F

CapPerComp

7:4

Reserved

3:0

Periodic Offset Compensation

Defines the periodic offs et co mpen sat ion.

0x0: OFF (default)

0x1: 1 second

0x2: 2 seconds

…

0x7: 7 seconds

0x8: 16 seconds

0x9: 18 seconds

…

0xE: 28 seconds

0xF: 60 seconds

0x71

CapProxEnable

7:0

Enables proximity sensing:

0x46: OFF

0x74: ON

Table 15 Capacitive Sensors Parameters

CapModeMisc

By default th e A SI is us in g a c om m on s ensitiv ity f or al l c apaciti ve sens or s as in t h e us ual cas e o verl a y m aterial

and sensors sizes are about equal. The register bits CapSensitivity0_1[7:4] determine the sensitivity for all

sensors in common sensitivity mode.

It might be required to have a different, individual, sensitivity for each CAP pin (for example proximity sensor

set to max sensitivity while touch sensors are set to a lower one). This can be obtained by setting

CapModeMisc[2:0] to “100” The individual sensitivity mode results in longer sensing periods than required in

common sensitivity mode.

CapMode11_8, CapMode7_4, CapMode3_0:

The CAP pins can be set as a button or disabled depending on the application.

minimum default maximum

buttons one twelve twelve

Table 16 Possible CAP pin modes

Buttons and disabled CAP pins can be attributed freely (examples in Figure 41). All buttons can be used for

touch or proximity sensing, in the latter case register CapProxEnable needs to be set accordingly .

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SX8633

cap1 (button1)

cap4 (disabled)

cap2 (button2)

cap3 (button3)

cap5 (disabled)

cap6 (disabled)

SX8633

cap1 (button1)

cap6 (button6)

cap3 (button3)

cap2 (disabled)

cap4 (disabled)

cap5 (disabled)

Figure 41 Button examples

CapSensitivity0_1, CapSensitivity2_3, CapSensitivity4_5, CapSensitivity6_7, CapSensitivity8_11,

CapProxEnable:

The sens itivity of the sens ors c an be set between 8 values . The higher the s ensit iv it y is set t he larg er t he val u e

of the ticks will be.

The minimum sensitivity can be used for thin overlay materials and large sensors, while the maximum

sensitivity is required for thicker overlay and smaller sensors or proximity sensing.

The required sensitivity needs to be determined during a product development phase. Too low sensitivity

settings result in missing touches. Too high sensitivity settings will result in fault detection of fingers hovering

above the touch sensors.

The sens itivit y is ident ical f or al l sensor s in c omm on sensit ivit y m ode using the bits CapSens iti vity0_1[7 :4] and

can be set individually using register CapModeMisc[2:0].

The maximum number of ticks that can be obtained depends on the selected sensitivity and if proximity

sensing is enabled. This is illustrated in Table 17 below.

Sensitivity Approximate

Maximum Tick Level

(CapPr o xEnable = OFF)

Approximate

Maximum Tick Level

(CapPr o xEnable = ON)

1000

4000

2000

8000

3000

12000

4000

16000

5000

20000

6000

24000

7000

28000

8000

32000

Table 17 ASI Maximum Tick Levels

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CapThresh0, CapThresh1, CapThresh2, CapThresh3, CapThresh4, CapThresh5, CapThresh6, CapThresh7,

CapThresh8, CapThresh9, CapThresh10, CapThresh11:

For each CAP pin a threshold level can be set individually.

The threshold levels are used by the SX8633 for making touch and release decisions on e.g. touch or no-

touch.

The details are explained in the sections for buttons.

CapPerComp:

The SX8633 offers a periodic offset compensation for applications which are subject to substantial

environm ental changes. The period ic offset compensation is done at a defined inter va l and only if buttons are

released.

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5.4 Button Parameters

Button Parameters

Address Name Bits Description

0x21

BtnCfg

7:6

Defines the buttons events reporting method.

00: Multiple reporting of all touches and releases (default)

01: Single reporting of the first button touch. Next button touches and releases are

ignored until release of the first button.

10: Reserved

11: Reserved

5:4

Defines the buttons interrupt (for all buttons)

00 : Interrupts masked

01 : Triggered on Touch

10 : Triggered on Release

11 : Triggered on Touch and Release (default)

3:2

Defines the number of samples at the scan period for determining a release

00: OFF, use incoming sample (defau lt)

01: 2 samples debounce

10: 3 samples debounce

11: 4 samples debounce

1:0

Defines the number of samples at the scan period for determining a touch

00: OFF, use incoming sample (defau lt)

01: 2 samples debounce

10: 3 samples debounce

11: 4 samples debounce

0x22

BtnAvgThresh

7:0

Defines the positive threshold for disabling the processing filter averaging.

If ticks are above the threshold, then the averaging is suspended

0x00: 0

0x01: 4

…

0x50: 320 (default)

…

0xFF: 1020

0x23

BtnCompNegThresh

7:0

Defines the negativ e offs et co mpen sat ion thr e sho ld.

0x00: 0

0x01: 4

…

0x50: 320 (default)

…

0xFF: 1020

0x24

BtnCompNegCntMax

7:0

Defines the number of ticks (below the negative offset compensation threshold)

which will initiate an offset compensation.

0x00: Reserved

0x01: 1 sample (def ault )

…

0xFF-> samples

0x25

BtnHysteresis

7:0

Defines the button hysteresis corresponding to a percentage of the CAP thresholds

(defined in Table 18).

0x00: 0%

…

0x0A: 10% (default)

…

0x64: 100%

All buttons use the same hysteresis

0x26

BtnStuckAtTimeout

7:0

Defines the stuck at timeout.

0x00: OFF (default)

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Button Parameters

Address Name Bits Description

0x01: 1 second

…

0xFF: 255 seconds

Table 18 Butt on Conf iguration Parameters

Please not e that proxim it y sensors are conf igured as buttons and oper ate exactly the sam e wa y as touch buttons .

All the parameters and procedures described below apply similarly .

A reliable button operation requires a coherent setting of the registers.

Figure 42 shows an example of a touch and a release. The ticks will vary slightly around the zero idle state.

When the touch occurs the ticks will rise sharply. At the release of the button the ticks will go down rapidly and

converge to the idle zero value.

time

ticks_diff

BtnHysteresis

= no-touch

Touch

(touch debounce = 1)

= touch

(release debounce = 0)

Release

CapThreshold

= scan events @ scan period

Figure 42 Touc h and Release Example

As soon as the ticks become larger than the CAP thresholds (see registers of the previous section) plus the

hysteresis (defined in register BtnHysteresis) the debounce counter starts.

In the example of Figure 42 the touch is validated after 2 samples (BtnCfg [1: 0] = 01).

The releas e is detec ted im m ediatel y (BtnCfg [3:2] = 00) at the f irs t sample which is belo w the thresh old m inus the

hysteresis.

BtnCfg

The SX8633 can re port a ll t ouc hes of multiple finger s o r the SX8633 can be s et to r epor t on l y the fir st det ect e d

touch. In the later case all succeeding touches are ignored. The very first touch should be released before a

next touch will be detected.

The user can select to have the interrupt signal on touching a button, releasing a button or both

In noisy environments it may be required to debounce the touch and release detection decision.

In case the debounce is enabled the SX8633 will count up to the number of debounce sam ples BtnCfg [1:0],

BtnCfg [3:2] before taking a touch or release decision. The sample period is identical to the scan period.

BtnAvgThresh

Small environmental and system noise cause the ticks to vary slowly around the zero idle mode value.

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In case the ticks get slightly positive this is considered as normal operation. Very large positive tick values

indicate a valid touch. The averaging filter is disabled as soon as the average reaches the value defined by

BtnAvgThresh. This mechanism avoids that a valid touch will be averaged and finally the tick difference

becomes zero.

In case three or more sensors reach the BtnAvgThresh value simultaneously then the SX8633 will start an

offset compensation procedure.

Small environmental and system noise cause the ticks to vary slowly around the zero idle mode value.

In case the ticks get slightly negative this is considered as normal operation. However large negative values will

trigger an offset compensation phase and a new set of DCVs will be obtained.

The decision to trigger a compensation phase based on negative ticks is determined by the value in the register

BtnCompNegThresh and by the number of ticks below the negative thresholds defined in register

BtnCompNegCntMax. An example is shown in Figure 43.

time

ticks_diff

CompNegCnt = 1, 2,...

CompNegThreshold

= ticks < CompNegThreshold

= ticks, no-touch

offset

compensation

CompNegCnt > CompNegCntMax

Figure 43 Negative Ticks Offset Compensation Trigger

BtnCompNegThresh

Small negative ticks are considered as normal operation and will occur very often.

Larger negative ticks however need to be avoided and a convenient method is to trigger an offset

compensation phase. The new set of DCV will assure the idle ticks will be close to zero again.

A trade-off has to be found for the value of this register. A negative threshold too close to zero will trigger a

compensation phase very often. A very negative threshold will never trigger.

BtnCompNegCntMax

As soon as the ticks get smaller than the Negative Threshold the Negative Counter starts to count.

If the counter goes beyond the Negative Counter Max then the offset compensation phase is triggered.

The rec omm ended valu e for this regis ter is ‘ 1’ which m eans that th e off set c ompens atio n starts on the f irst ti ck

below the negative threshold.

BtnHysteresis

The hysteresis percentage is identical for all buttons.

A touch is detected if the ticks are getting larger as the value defined by:

CapThreshold + CapThreshold * hysteresis.

A release is detected if the ticks are getting smaller as the value defined by:

CapThreshold - CapThreshold * hysteresis.

BtnStuckAtTimeout

The stuckat timer can avoid sticky buttons.

If the stuckat timer is set to one second then the touch of a finger will last only for one second and then a

compensation will be performed and button hence considered released, even if the finger remains on the

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button f or a l ong er time. After the ac tua l f inger r e le as e the b utto n c an be t ouc he d aga in a nd wil l b e rep or ted as

usual.

In case the stuckat timer is not required it can be set to zero.

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5.5 Mapping Parameters

Mapping Parameters

Address Name Bits Description

0x33

MapWakeupSize

7:3

Reserved

2:0

Doze -> Active wake up seque nce size.

0: Any sensor event (default)

1: key0

2: key0, key1

…

6: key0, key1, … key 5

7: No sensor event, only GPI or I2C cmd can exit Doze mode

Each key must be followed by a release to be validated.

Any other sensor event before the release is ignored.

Any wrong key implies the whole sequence to be enter ed ag ain.

0x34

MapWakeupValue0

7:4

key5

Defines the sensor event associated to each key.

0x00: Btn0 (default)

0x01: Btn1

…

0x0B: Btn11

0x0C…0x0F: Reserved

3:0

key4

0x35

MapWakeupValue1

7:4

key3

3:0

key2

0x36

MapWakeupValue2

7:4

key1

3:0

key0

0x37

MapAutoLight0

7:4

GPIO[7]

Defines the mapping between GPOs (with

Autolight ON) and sensor events.

0x00: Btn0 (default)

0x01: Btn1

…

0x0B: Btn11

0x0C: Group0 as defined by MapAutoLightGrp0

0x0D: Group1 as defined by MapAutoLightGrp1

0x0E: Reserved

0x0F: Reserved

Several GPOs can be mapped to the same

sensor

event and will be controlled simultaneously.

3:0

GPIO[6]

0x38

MapAutoLight1

7:4

GPIO[5]

3:0

GPIO[4]

0x39

MapAutoLight2

7:4

GPIO[3]

3:0

GPIO[2]

0x3A

MapAutoLight3

7:4

GPIO[1]

3:0

GPIO[0]

0x3B

MapAutoLightGrp0Msb

7:4

Reserved

Btn11

Defines Group0 sensor events:

0: OFF (default)

1: ON

If any of the enabled sensor events occurs the

Group0 event will occur as well.

All sensors events within the group can be

independently set.

Btn10

Btn9

Btn8

0x3C

MapAutoLightGrp0Lsb

Btn7

Btn6

Btn5

Btn4

Btn3

Btn2

Btn1

Btn0

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Mapping Parameters

Address Name Bits Description

0x3D

MapAutoLightGrp1Msb

7:4

Reserved

Btn11

Defines Group1 sensor events:

0: OFF (default)

1: ON

If any of the enabled sensor events occurs the

Group0 event will occur as well.

All sensors events within the group can be

independently set.

Btn10

Btn9

Btn8

0x3E

MapAutoLightGrp1Lsb

Btn7

Btn6

Btn5

Btn4

Btn3

Btn2

Btn1

Btn0

Table 19 Mapping Parameters

MapWakeupSize

The number of keys defining the wakeup sequence can be set from 1 to 6.

If the size is set to 0 then wakeup is done on any sensor event.

If the size is set to 6 then wakeup is done only by GPI or an I2C command (may be required if proximity sensing is

enable, see § 3.17 for more details).

MapWakeupValue0, MapWakeupValue1, MapWakeupValue2

For the wakeup sequence Btn2 -> Btn5 -> Btn6 ->Btn0 the required register settings are:

- MapWakeupSize set to 0x04,

- key0 = 0x2

- key1 = 0x5

=> MapWakeupValue2 set to 0x52

- key2 = 0x6

- key3 = 0x0

=> MapWakeupValue2 set to 0x06

MapAutoLight0, MapAutoLight1, MapAutoLight2, MapAutoLight3

MapAutoLightGrp0Msb, MapAutoLightGrp0Lsb, MapAutoLightGrp1Msb, MapAutoLightGrp1Lsb

These r egist ers d ef ine the mapping bet ween the GPO pins (with Autolight ON) and the sensor information whic h

will control its ON/OFF state.

The m apping can be done to a specific sensor event but also on groups (in this case an y sensor event in the

group will control the GPO).

Table 20 defines for each selectable sensor event, which action will trigger corresponding GPO to switch ON

or OFF.

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MapAutoLight GPO ON GPO OFF

BtnX

Touch

Release

Table 20 Autolight Mapping, Sensor Information

Examples:

- If GPO[0] should change state ac c ordi ng l y to Btn4 then MapAutoLight3[3:0] should be set to 0x04.

- If GPO[0] should change state accordingly to Btn0 or Btn1 then Group0 can be used as following:

- MapAutoLight3[3:0] should be set to 0x0C (ie Group0).

- MapAutoLightGrp0 should be set to 0x0003 (ie Btn0 or Btn1)

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5.6 GPIO Parameters

GPIO Parameters

Address Name Bits Description

0x40

GpioMode7_4

7:6

GPIO[7] Mode

Defines the GPIO mode.

00: GPO (default)

01: GPP

10: GPI

11: Reserved

5:4

GPIO[6] Mode

3:2

GPIO[5] Mode

1:0

GPIO[4] Mode

0x41

GpioMode3_0

7:6

GPIO[3] Mode

5:4

GPIO[2] Mode

3:2

GPIO[1] Mode

1:0

GPIO[0] Mode

0x42

GpioOutPwrUp

7:0

GPIO[7] Output Value at Power Up

Defines the values of GPO and GPP pins

after power up ie default values of I2C

parameters GpoCtrl and GppIntensity

respectively.

0: OFF(GPO) / IntensityOff (GPP) (default)

1: ON (GPO) / IntensityOn (GPP)

Bits corresponding to GPO pins with

Autolight ON should be left to 0.

Before being actually initialized GPIOs are

set as inputs with pull up.

GPIO[6] Output Value at Power Up

GPIO[5] Output Value at Power Up

GPIO[4] Output Value at Power Up

GPIO[3] Output Value at Power Up

GPIO[2] Output Value at Power Up

GPIO[1] Output Value at Power Up

GPIO[0] Output Value at Power Up

0x43

GpioAutoLight

7:0

GPIO[7] AutoLight

Enables Autolight in GPO mode

0 : OFF

1 : ON (default)

GPIO[6] AutoLight

GPIO[5] AutoLight

GPIO[4] AutoLight

GPIO[3] AutoLight

GPIO[2] AutoLight

GPIO[1] AutoLight

GPIO[0] AutoLight

0x44

GpioPolarity

7:0

GPIO[7] Output Polarity

Defines the polarity of the GPO and GPP

pins.

0: Inverted (default)

1: Normal

GPIO[6] Output Polarity

GPIO[5] Output Polarity

GPIO[4] Output Polarity

GPIO[3] Output Polarity

GPIO[2] Output Polarity

GPIO[1] Output Polarity

GPIO[0] Output Polarity

0x45

GpioIntensityOn0

7:0

ON Intensity Index

Defines the ON intensity index

0x00: 0

0x01: 1

0x46

GpioIntensityOn1

0x47

GpioIntensityOn2

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GPIO Parameters

Address Name Bits Description

0x48

GpioIntensityOn3

…

0xFF: 255 (default)

0x49

GpioIntensityOn4

0x4A

GpioIntensityOn5

0x4B

GpioIntensityOn6

0x4C

GpioIntensityOn7

0x4D

GpioIntensityOff0

7:0

OFF Intensity Index

Defines the OFF intensity index

0x00: 0 (default)

0x01: 1

…

0xFF: 255

0x4E

GpioIntensityOff1

0x4F

GpioIntensityOff2

0x50

GpioIntensityOff3

0x51

GpioIntensityOff4

0x52

GpioIntensityOff5

0x53

GpioIntensityOff6

0x54

GpioIntensityOff7

0x56

GpioFunction

7:0

GPIO[7] Function

Defines the intensity index vs PWM pulse

width function.

0: Logarithmic (default)

1: Linear

GPIO[6] Function

GPIO[5] Function

GPIO[4] Function

GPIO[3] Function

GPIO[2] Function

GPIO[1] Function

GPIO[0] Function

0x57

GpioIncFactor

7:0

GPIO[7] Fading Increment Factor

Defines the fading increment f actor .

0: 1, intensi ty index incremented every

increm ent time (default)

1: 16, intensity index incremented every 16

increm ent times

GPIO[6] Fading Increment Factor

GPIO[5] Fading Increment Factor

GPIO[4] Fading Increment Factor

GPIO[3] Fading Increment Factor

GPIO[2] Fading Increment Factor

GPIO[1] Fading Increment Factor

GPIO[0] Fading Increment Factor

0x58

GpioDecFactor

7:0

GPIO[7] Fading Decrement Factor

Defines the fading decrement factor.

0: 1, intensity index decremented every

decrem ent time (default)

1: 16, intensity index decremented every 16

decrem ent times

GPIO[6] Fading Decrement Factor

GPIO[5] Fading Decrement Factor

GPIO[4] Fading Decrement Factor

GPIO[3] Fading Decrement Factor

GPIO[2] Fading Decrem ent Fa ctor

GPIO[1] Fading Decrement Factor

GPIO[0] Fading Decrement Factor

0x59

GpioIncTime7_6

7:4

GPIO[7] Fading Increment Time

Defines the fading increment time.

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GPIO Parameters

Address Name Bits Description

3:0

GPIO[6] Fading Increment Time

0x0: OFF (default)

0x1: 0.5ms

0x2: 1ms

…

0xF: 7.5ms

The total fading in time will be:

GpioIncTime*GpioIncFactor*

(GpioIntensityOn – GpioIntensityOff)

0x5A

GpioIncTime5_4

7:4

GPIO[5] Fading Increment Time

3:0

GPIO[4] Fading Increment Time

0x5B

GpioIncTime3_2

7:4

GPIO[3] Fading Increment Time

3:0

GPIO[2] Fading Increment Time

0x5C

GpioIncTime1_0

7:4

GPIO[1] Fading Increment Time

3:0

GPIO[0] Fading Increment Time

0x5D

GpioDecTime7_6

7:4

GPIO[7] Fading Decrement Time

Defines the fading decrement time.

0x0: OFF

0x1: 0.5ms

0x2: 1ms

…

0x4: 2.0ms (default)

…

0xF: 7.5ms

The total fading out time will be:

GpioDecTime*GpioDecFactor*

(GpioIntensityOn – GpioIntensityOff)

3:0

GPIO[6] Fading Decrement Time

0x5E

GpioDecTime5_4

7:4

GPIO[5] Fading Decrement Time

3:0

GPIO[4] Fading Decrement Time

0x5F

GpioDecTime3_2

7:4

GPIO[3] Fading Decrement Time

3:0

GPIO[2] Fading Decrement Time

0x60

GpioDecTime1_0

7:4

GPIO[1] Fading Decrement Time

3:0

GPIO[0] Fading Decrement Time

0x61

GpioOffDelay7_6

7:4

GPIO[7] OFF Delay

Defines the delay after GPO OFF trigger

before fading out starts.

0x0: OFF (default)

0x1: 200ms

0x2: 400ms

…

0xF: 3000ms

3:0

GPIO[6] OFF Delay

0x62

GpioOffDelay5_4

7:4

GPIO[5] OFF Delay

3:0

GPIO[4] OFF Delay

0x63

GpioOffDelay3_2

7:4

GPIO[3] OFF Delay

3:0

GPIO[2] OFF Delay

0x64

GpioOffDelay1_0

7:4

GPIO[1] OFF Delay

3:0

GPIO[0] OFF Delay

0x65

GpioPullUpDown7_4

7:6

GPIO[7] Pullup/down

Enables pullup/down resistors for GPI pins.

00 : None (default)

01 : Pullup

10 : Pulldown

11 : Reserved

5:4

GPIO[6] Pullup/down

3:2

GPIO[5] Pullup/down

1:0

GPIO[4] Pullup/down

0x66

GpioPullUpDown3_0

7:6

GPIO[3] Pullup/down

5:4

GPIO[2] Pullup/down

3:2

GPIO[1] Pullup/down

1:0

GPIO[0] Pullup/down

0x67

GpioInterrupt7_4

7:6

GPI[7] Interrupt

Defines the GPI edge which will trigger INTB

falling edge and exit Sleep/Doze modes if

relevant.

00 : None (default)

01 : Rising

10 : Falling

11 : Both

5:4

GPI[6] Interrupt

3:2

GPI[5] Interrupt

1:0

GPI[4] Interrupt

0x68

GpioInterrupt3_0

7:6

GPI[3] Interrupt

5:4

GPI[2] Interrupt

3:2

GPI[1] Interrupt

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GPIO Parameters

Address Name Bits Description

1:0

GPI[0] Interrupt

0x69

GpioDebounce

7:0

GPI[7] Debounce

Enables the GPI debounce (done on 10

consecutiv e sample s at 1ms).

0 : OFF (default)

1 : ON

GPI[6] Debounce

GPI[5] Debounce

GPI[4] Debounce

GPI[3] Debounce

GPI[2] Debounce

GPI[1] Debounce

GPI[0] Debounce

Table 21 GPIO Parameters

Table 22 resumes the applicable SPM and I2C parameters for each GPIO mode.

GPI

GPP

GPO

SPM

GpioMode

GpioOutPwrUp

GpioAutoligth

GpioPolarity

GpioIntensityOn

GpioIntensityOff

GpioFunction

GpioIncFactor

GpioDecFactor

GpioIncTime

GpioDecTime

GpioOffDelay

GpioPullUpDown

GpioInterrupt

GpioDebounce

I2C

IrqSrc[4]

GpiStat

GpoCtrl

GppPinId

GppIntensity

1 At power up, GppIntensity of each GPP pin is initialized with GpioIntensityOn or GpioIntensityOff depending on GpioOutPwrUp

corresponding bits value.

2 Only if Autolight is OFF, else must be left to 0 (default value)

3 Only if Autolight is OFF, else ignored

Table 22 Applicable SPM/I2C Parameters vs. GPIO Mode

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6 I2C INTERFACE

The I2C implemented on the SX8633 is compliant with:

- standard (100kb/s), fast mode (400kb/s)

- slave mode

- 7 bit address (default 0x2B). The default address can be changed in the NVM at address 0x04.

The host can use the I2C to read and write data at any time. The effective changes will be applied at the next

process ing phase (section 3.3).

Three types of registers are considered:

- status ( read) . T hes e r e gis ter s give information about the stat us of the c apac iti ve butto ns , GPIs, op er ation modes

etc…

- control (read/write). These registers control the soft reset, operating modes, GPIOs and offset compensation.

- SPM gateway (read/write). These registers are used for the communication between host and the SPM. The

SPM gateway communication is done typically at power up and is not supposed to be changed when the

application is running. The SPM needs to be re-stored each time the SX8633 is powered down.

The SPM c an be stored pe rmanentl y in the NVM m emory of the SX8633. The SPM gate way comm unication over

the I2C at power up is then not required.

The I2C will be able to read and write from a start address and then perform read or writes sequentially, and the

address increments automatically.

The supported I2C access formats are described in the next sections.

6.1 I2C Write

The format of the I2C write is given in Figure 44.

After the start condition [S], the slave address (SA) is sent, followed by an eighth bit (‘0’) indicating a Write. The

SX8633 the n Acknowledge s [A] that it is being a ddressed, and the M aster sends an 8 bit D ata Byte consist ing of

the SX8633 Regis ter Ad dre s s (RA) . T he Sla ve Acknowled ges [ A] a nd t he master sends th e a ppr opriate 8 bit D ata

Byte (W D0). Again the Slave Ack nowledges [A]. In c ase the m aster needs to write m ore data, a succeedin g 8 bit

Data Byte will follow (WD1), acknowledged by the slave [A]. This sequence will be repeated until the master

terminates the transfer with the Stop condition [P].

SSA 0 RAA A WD0 A WD1 A WDn A P

optional optional

S: Start condition

SA: Slave Address

A: Acknowledge

RA: Register Address

WDn: Write Data byte (0...n)

P: Stop condition

from master to slave

from slave to master

Figure 44 I2C write

The regis ter addres s is incr emented aut omaticall y when s uccessive re gister data (W D1...W Dn) is suppl ied by th e

master.

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6.2 I2C read

The format of the I2C read is given in Figure 45.

After the start condition [S], the slave address (SA) is sent, followed by an eighth bit (‘0’) indicating a W rite. The

SX8633 t hen Ack nowledges [A] that i t is be ing addres sed, a nd the M aster respo nds with an 8 bit Data co nsisting

of the Register Address (RA). The Slave Acknowledges [A] and the master sends the Repeated Start Condition

[Sr]. Once again, the slave address (SA) is sent, followed by an eighth bit (‘1’) indicating a Read.

The SX8633 responds with an Ackno wle dge [A] and the r ead Data b yte (RD 0). If the m aster needs to read more

data it will acknowledge [A] and the SX8633 will send the next read byte (RD1). This sequence can be repeated

until the master terminates with a NACK [N] followed by a stop [P].

S SA 0 RA

AASr N

S: Start condition

SA: Slave Address

Sr:Repeated Start condition

A:Acknowledge

N: Not Acknowledge (terminating read stream)

RA: Register Address

RDn: Read Data byte (0...n)

P: Stop condition

from master to slave

from slave to master

RD0 A

optional

SA 1ARD1

optional

RDnA P

Figure 45 I 2C r ead

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6.3 I2C Registers Overview

Address Name R/W Description

0x00 IrqSrc read Interrupt Source

0x01 CapStatMsb read Button Status MSB

0x02 CapStatLsb read Button Status LSB

0x03 Reserved

0x04 Reserved

0x05 Reserved

0x06 Reserved

0x07 GpiStat read GPI Status

0x08 SpmStat read SPM Status

0x09 CompOpMode read/write

Compensation and

Operating Mode

0x0A GpoCtrl read/write GPO Control

0x0B GppPinId read/write GPP Pin Selection

0x0C GppIntensity read/write GPP Intensity

0x0D SpmCfg read/write SPM Configuration

0x0E SpmBaseAddr read/write SPM Base Address

0x0F Reserved

0xAC SpmKeyMsb read/write SPM Key MSB

0xAD SpmkeyLsb read/write SPM Key LSB

0xB1 SoftReset read/write Software Reset

Table 23 I2 C Re gis ters Overview

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6.4 Status Registers

Address Name Bits Description

0x00 IrqSrc

7 Reserved

Interrupt source flags

0: Inactive (default)

1: Active

INTB goes low if any of

these bits is set.

More than one bit can be

set.

Reading IrqSrc clears it

together with INTB.

6 NVM burn interrupt flag

SPM write interrupt flag

4 GPI interrupt flag

3 Reserved

2 Buttons interrupt flag

1 Compensation interrupt flag

0 Operating Mode interrupt flag

Table 24 Int er rupt Source

The delay between the actual event and the flags indicating the interrupt source may be one scan period.

IrqSrc[6] is set once NVM burn procedure is completed.

IrqSrc[5] is set once SPM write is effective.

IrqSrc[4] is set if a GPI edge as programmed in GpioInterrupt occurred. GpiStat shows the detailed status of the

GPI pins.

IrqSrc[2] is set if a Button even t oc cur r ed (touc h or r ele as e if enabl ed). Cap Sta tLsb show the det ai le d status of the

Buttons.

IrqSrc[1] is set once compensation procedure is completed either through automatic trigger or via host request.

IrqSrc[0] is set when actually e ntering Active or D oze mode either throu gh automatic wak eup or via host reques t.

CompOpmode shows the current operation mode.

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Address Name Bits Description

0x01 CapStatMsb

7:4

Reserved

Button 11 Touched

Button Touch statu s

0: Released (default)

1: Touched

Button 10 Touched

Button 9 Touched

Button 8 Touched

0x02 CapStatLsb

Button 7 Touched

Button 6 Touched

5 Button 5 Touched

Button 4 Touched

Button 3 Touched

Button 2 Touched

Button 1 Touched

Button 0 Touched

Table 25, Button status MSB/LSB

Address Name Bits Description

0x07 GpiStat 7:0 GPI[7:0]

Status

Status of each individual GPI pin

0: Low

1: High

Bits of non-GPI pins are set to 0.

Table 26 I2C GPI status

Address Name Bits Description

0x08 SpmStat

7:4 reserved

3 NvmValid

Indicates if the current NVM is valid.

0: No – QSM is used

1: Yes – NVM is used

2:0 NvmCount

Indicates the number of times NVM has been burned:

0: None – QSM is used (default)

1: Once – NVM is used if NvmValid = 1, else QSM.

2: Twice – NVM is used if NvmValid = 1, else QSM.

3: Three times – NVM is used if NvmValid = 1, else QSM.

4: More than three times – QSM is used

Table 27 I2C SPM status

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6.5 Control Registers

Address Name Bits Description

0x09 CompOpMode

7:3

Reserved*, write only ‘00000’

2 Compensation Indicate s/tr i gger s com pen sati o n pro cedur e

0: Compensation completed (default)

1: read -> compen sation running ; write -> trigger

compensation

1:0 Operating Mode

Indicates/programs** operating mode

00: Active mode (default)

01: Doze mode

10: Sleep mode

11: Reserved

Table 28 I2C compensation, operation modes

* The reading of these reser ved bits wil l retur n varying values .

** After the operating mode change (Active/Doze) the host should wait for INTB or 300ms before

performing any I2C read access.

Address Name Bits Description

0x0A GpoCtrl 7:0 GpoCtrl[7:0]

Triggers ON/OFF state of GPOs when Autolight is

OFF

0: OFF (ie go to IntensityOff)

1: ON (ie go to IntensityOn)

Default is set by SPM parameter GpioOutPwrUp

Bits of non-GPO pins are ignor ed.

Table 29 I2C GPO Control

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Address Name Bits Description

0x0B GppPinId

7:3 Reserved, write only ‘00000’

2:0 GPP Pin Identifier

Defines the GPP pin to which the GppIntensity is

assigned for the following read/write operations

0x0 = GPP0 (default)

0x1 = GPP1

...

0x7 = GPP7

GPPx refers to pin GPIOx configured as GPP

Table 30 I2C GPP Pin Identifier

Address Name Bits Description

0x0C GppIntensity 7:0

Defines the intensity index of the GPP pin selected in GppPinId

0x00: 0

0x01: 1

…

0xFF: 255

Reading returns the intensity index of the GPP pin selected in GppPinId.

Default value is IntensityOn or IntensityOff depending on GpioOutPwrUp.

Table 31 I2C GPP Intensity

Address Name Bits Description

0xB1 SoftReset 7:0 Writing 0xDE followed by 0x00 will reset the chip.

Table 32 I2C Soft Reset

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6.6 SPM Gateway Registers

The SX8633 I2C interface offers two registers for exchanging the SPM data with the host.

• SpmCfg

• SpmBaseAddr

Address Name Bits Description

0x0D SpmCfg

7:6 00: Reserved

5:4

Enables I2C SPM mode

00: OFF (default)

01: ON

10: Reserved

11: Reserved

Defines r/w direction of SPM

0: SPM write access (default)

1: SPM read access

2:0 000: Reserved

Table 33 SPM access configuration

Address Name Bits Description

0x0E SpmBaseAddr 7:0 SPM Base Address (modulo 8).

The lowest address is 0x00 (default).

The highest address is 0x78.

Table 34 SP M Base Ad dre s s

The exchange of data, read and write, between the host and the SPM is always done in bursts of eight bytes.

The base address of each burst of eight bytes is a modulo 8 number, starting at 0x00 and ending at 0x78.

The registers SpmKeyMsb and SpmKeyLsb are required for NVM programming as described in section 6.7.

Address Name Bits Description

0xAC SpmKeyMsb 7:0 SPM to NVM burn Ke y MSB Unlock requires writing data: 0x62

Table 35 SPM Key MSB

Address Name Bits Description

0xAD SpmKeyLsb 7:0 SPM to NVM burn Key LSB Unlock requires writing data: 0x9D

Table 36 SPM Key LSB

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6.6.1 SPM Write Sequence

The SPM write can be done in any mode (Active, Doze, Sleep). Writing the SPM in Sleep is useful to avoid

potential transient behaviors.

The SPM must always be written in blocks of 8 bytes. The sequence is described below:

1. Set the I2C in SPM mode by writing “01” to SpmCfg[5:4] and SPM write access by writing ‘0’ to SpmCfg[3].

2. Write the SPM base address to SpmBaseAddr (The base address needs to be a value modulo 8).

3. Write the eight consecutive bytes to I2C address 0, 1, 2, …7

4. Terminate by writing “000” to SpmCfg[5:3].

SSA 00x0D

A0x10

S : Start condition

SA : Slave address

A : Slave acknowledge

BA : NVM Base Address

WDn : Write Data byte n, n = 0 to 7

P : Stop condition

...

From master to slave

From slave to master

SSA 0 0x0EA BAA P

SSA 00x00

AWD0

WD7

SSA 00x0D

A0x00A P

Figure 46: SPM Write Sequence

The complete SPM can be written by repeating 16 times the cycles shown in Figure 46 using base addresses

0x00, 0x08, 0x10, …, 0x70, 0x78. Between each sequence the host should wait for INTB (Active/Doze) or 30ms

in Sleep.

In Active or Doze mode, once the SPM write sequence is actually applied, the INTB pin will be asserted and

IrqSrc[5] set. In Sleep mode the SPM write can be actually applied with a delay of 30ms.

The host clears the interrupt and IrqSrc[5] by reading the IrqSrc register.

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6.6.2 SPM Read Sequence

The SPM read can be done in any mode (Active, Doze, Sleep).

The SPM must always be read in blocks of 8 bytes. The sequence is described below:

1. Set the I2C in SPM mode by writing “01” to SpmCfg[5:4] and SPM read access by writing ‘1’ to SpmCfg[3].

2. Write the SPM base address to SpmBaseAddr (The base address needs to be a value modulo 8).

3. Read the eight consecutive bytes from I2C address 0, 1, 2, …7

4. Terminate by writing “000” to SpmCfg[5:3].

S SA 0 0x0D

A0x18

S, Sr : Start condition

SA : Slave address

A : Slave acknowledge

N : Not Acknowledge (terminates read stream)

BA : NVM Base Address

RDn : Read Data byte n, n = 0 to 7

P : Stop condition

From master to slave

From slave to master

S SA 0 0x0E

A BA

S SA 0 0x0D

A0x00A P

SSA 0 A0x00 ASr SA 1 A RD0 A

...

RD7 NP

Figure 47: SPM Read Sequenc e

The com plete SPM c an be read b y repeating 1 6 tim es the c ycles sho wn in Figure 47 usin g base addr ess es 0x00,

0x08, 0x10, …, 0x70, 0x78.

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6.7 NVM burn

The content of the SPM can be copied permanently (burned) into the NVM to be used as the new default

parameters. The burning of the NVM can be done up to three times and must be done only when the SPM is

complete l y written with the des ired dat a. The NVM burn must be done in Active or Doze mode.

Once the NVM burn process is terminated IrqSrc[6] will be set and INTB asserted.

After a reset the burned NVM parameters will be copied into the SPM.

The number of times the NVM has been burned can be monitored by reading NvmCount from the I2C register

SpmStat[2:0].

NVM

SPM

SpmStat[2:0] 1 2 3

0 4

QSM

Figure 48 Simplified Diagram NvmCount

Figure 48 shows the simplified diagram of the NVM counter. The SX8633 is delivered with empty NVM and

NvmCount set to zero. The SPM points to the QSM.

Each NVM burn will increase the NvmCount. At the fourth NVM burn the SX8633 switches definitely to the QSM.

The burning of the SPM into the NVM is done by executing a special sequence of four I2C commands.

1. Write the data 0x62 to the I2C register I2CKeyMsb. Term inate the I2C write b y a STOP.

2. Write the data 0x9D to the I2C register I2CKeyLsb. Terminate the I2C write by a STOP.

3. Write the data 0xA5 to the I2C register I2CSpmBaseAddr. Terminate the I2C write by a STOP.

4. Write the data 0x5A to the I2C register I2CSpmBaseAddr. Terminate the I2C write by a STOP.

This is illustrated in Figure 49.

S SA 0 0x0E

A0xA5A P

S : Start condition

SA : Slave address

A : Slave acknowledge

P : Stop condition

From master to slave

From slave to master

S SA 0 0x0E

A 0x5A

S SA 0 0xAC

A0x62A P

SSA 0 0xADA 0x9D

Figure 49: NVM burn procedure

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6.8 Monitor Mode

Monitor mode allows the host to read “real-time” sensor information (CAPxRaw, CAPxAvg, CAPxDiff).

It is enabled by setting bit 2 of I2C register SpmCfg (address 0x0D).

W hen enabled, it uses a specific m onitor scan period (Cf below) and generates an interrupt e ver y tim e a new full

set of data is available (hence every scan period).

Address

Name

Bits

Description

0xF9

MonitorScanPeriod

7:0

Monitor Mode Scan Period

0x00: Reserved

0x01: 15ms

…

0x0D: 195ms (default)

…

0xFF: 255 x 15ms

Monitor mode scan period is located at address 0xF9 can be written similarly as SPM data (Cf. §6.6.1).

Interrupt is cleared normally by reading I2C register IrqSrc (address 0x00) but no specific flag is set.

CAPxRaw/Avg/Diff data can be read similarly as SPM data (Cf. §6.6.2).

Base address BA = 0xB4 is the beginning of the CAPxDiff data location and data are organized this way:

0xB4: CAP0Diff, MSB

0xB5: CAP0Diff, LSB

0xB6: CAP1Diff, MSB

etc...

Values are coded 16bits signed 2's complement format and updated at each scan period.

Base address BA = 0x80 is the beginning of the CAPxRaw data location .

Base address BA = 0x9A is the beginning of the CAPxAvg data loc at ion.

Data should be read before the next interrupt occurs (i.e. within one scan period).

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7 APPLICATION INFORMATION

7.1 Typical Application Schematic

SX8633

cap2

cap3

cap4

cap5

cap6

cap8

cap7

cap9

gnd

gpio5

gpio4

gpio3

gpio2

gpio1

gnd

gpio0

cap1

cap0

vana

resetb

gnd

gpio7

vdig

gpio6

cap10

cap11

vdd

scl

intb

sda

analog

sensor

interface

micro

processor

RAM

ROM

NVM

I2C

GPIO

controller

power management

clock

generation

PWM

LED

controller

bottom plate

HOST

proximity

Figure 50 Ty p ic al Application

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7.2 Example of Touch+Proximity Module

7.2.1 Overview

To demonstrate the proximity sensing feature of the SX863x family, a module has been designed and is illustrated

in figure below.

Touch Buttons

(1.5cm pitch) Proximity Sensor

Module Size (white area) :

sensors area + SX8633 + connector (min.) Bicolor LEDs

(blue, orange) Overlay

(2mm acrylic glass)

Figure 51 Touch+Proximity Module Over v iew

The touch button controller is running in stand-alone (ie without host) and uses the Autolight mode to turn LEDs

ON/OFF accordingly to the touch buttons and proximity sensing status.

7.2.2 Operation

Module operation can be seen as 5 steps which are described in figure below

1. No finger

=> No proximity detected

=> All LEDs OFF

2. Finger approaches

=> Proximity detect ed

=> Blue LEDs turned ON

3. Button touch

=> Orange LED turned ON

(blue+orange = pink)

4. Button release

=> Orange LED turned

OFF

5. Finger removed

=> No proximity detected

=> Blue LEDs turned OFF

Figure 52 Touch+Proximity Module Oper ation

Notes:

- For better user experience, bicolor LEDs have been used here but one could decide to design a module with

normal unicolor LEDs. In this case, step 3 above would simply consist in a higher (blue) intensity for the LED of

the button touched.

- For obvious demonstration purposes the overlay used here is transparent but in typical applications (TV,

Monitor, Set-top box, etc) the overlay would be opaque enough so that when LEDs are OFF (ie no proximity

detected) the PCB is not visible to the user.

7.2.3 Performance

The proximity sensing distance of detection has been measured in these conditions:

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- CapProxEnable = ON

- CapSensitivity = 7 (Max)

- CapThr es hold = 300

- Board main supplied and placed vertically ie same orientation as hand/finger

- Finger pointing center button

The results obtained are provided in table below:

Distance of Detection

Palm

~10cm

Finger (natural position)

~6cm

Orthogonal finger (worst case)

~4cm

Table 37 Proximity Sensing Distance of Detection

7.2.4 Schematics

Figure 53 Touch+Proximity Module Schemat ics

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7.2.5 Layout

Figure 54 Touch+Proximity Module Layout - Top

Figure 55 Touch+Proximity Module Layout - Mid1

Figure 56 Touch+Proximity Module Layout - Mid2

Figure 57 Touch+Proximity Module Layout - Bottom

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8 REFERENCES

[1] Capacitive Touch Sensing Layout guidelines on www.semtech.com

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9 PACKAGING INFORMATION

9.1 Packag e Ou tl in e Drawing

SX8633 is ass embled in a MLPQ-W32 package as shown in Figure 58.

Figure 58 Package O utline Drawing

9.2 Land Pattern

The land pattern of MLPQ-W32 package, 5 mm x 5 mm is shown in Figure 59.

Figure 59 Land Pattern

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Contact Inf ormation

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