SX8644_11 datasheet(3/78 Pages) SEMTECH

Part #	SX8644

Description	Ultra Low Power, Capacitive Button and Slider Touch Controller (12 sensors) with Enhanced LED Drivers

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Manufacturer	SEMTECH [Semtech Corporation]

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ADVANCED COMMUNICATIONS & SENSING

DATASHEET

Revision 7_5, February 11

www.semtech.com

3

SX8644

Ultra Low Power, Capacitive Button and Slider

Touch Controller (12 sensors) with Enhanced LED Drivers

3.15.1

Power up

25

3.15.2

Assertion

25

3.15.3

Clearing

25

3.15.4

Example

26

3.16

General Purpose Input and Outputs

26

3.16.1

Introduction and Definitions

26

3.16.2

GPI

27

3.16.3

GPP

27

3.16.4

GPO

28

3.16.5

Intensity index vs PWM pulse width

31

3.17

Smart Wake Up

32

4

PIN DESCRIPTIONS ..................................................................................................................... 33

4.1

Introduction

33

4.2

ASI pins

33

4.3

Host interface pins

34

4.4

Power management pins

37

4.5

General purpose IO pins

38

5

DETAILED CONFIGURATION DESCRIPTIONS .............................................................................. 39

5.1

Introduction

39

5.2

General Parameters

42

5.3

Capacitive Sensors Parameters

43

5.4

Button Parameters

48

5.5

Slider Parameters

52

5.6

Mapping Parameters

56

5.7

GPIO Parameters

59

6

I2C INTERFACE........................................................................................................................... 63

6.1

I2C Write

63

6.2

I2C read

64

6.3

I2C Registers Overview

65

6.4

Status Registers

66

6.5

Control Registers

69

6.6

SPM Gateway Registers

71

6.6.1

SPM Write Sequence

72

6.6.2

SPM Read Sequence

73

6.7

NVM burn

74

7

APPLICATION INFORMATION ...................................................................................................... 75

8

PACKAGING INFORMATION ........................................................................................................ 76

8.1

Package Outline Drawing MLPQ-W32

76

8.2

Land Pattern MLPQ-W32

76

8.3

Package Outline Drawing LQFP32

77

8.4

Land Pattern LQFP32

77

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