SX8657 datasheet(3/61 Pages) SEMTECH

Part #	SX8657

Description	Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing

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Manufacturer	SEMTECH [Semtech Corporation]

Direct Link	http://www.semtech.com

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ADVANCED COMMUNICATIONS & SENSING

Rev 1 – 25

th July 2011

3

www.semtech.com

SX8657/SX8658

Haptics Enabled 4/5-Wire

Resistive Touchscreen Controller with Proximity Sensing

5.3.6

PROXSTAT Update

31

5.4

Host Operation

32

5.4.1

General Description

32

5.4.2

Proximity Sensing vs Touch Operations

32

5.4.3

Minimum Scan Period (i.e. PROXSCANPERIOD)

34

6

HAPTICS INTERFACE (SX8657/58) .......................................................................................... 35

6.1

Introduction

35

6.2

ERM Load

35

6.2.1

Introduction

35

6.2.2

PWM Mode

36

6.2.3

I2C Mode

36

6.3

LRA Load

36

6.3.1

Introduction

36

6.3.2

PWM Mode

37

6.3.3

I2C Mode

37

6.4

Short-Circuit Protection

37

7

TEMPERATURE SENSOR.......................................................................................................... 38

8

INTERRUPT (NIRQ) .................................................................................................................. 39

8.1

Introduction

39

8.2

Registers Overview

39

8.2.1

RegIrqMsk

39

8.2.2

RegIrqSrc

39

8.2.3

RegStat

39

8.3

Host Procedure

39

9

AUXILIARY PINS (AUX1/AUX2/AUX3)...................................................................................... 40

10

RESET...................................................................................................................................... 41

10.1

Hardware (POR and NRST)

41

10.2

Software (RegReset)

41

10.3

ESD Event (RESETSTAT)

41

11

I2C INTERFACE........................................................................................................................ 42

11.1

Introduction

42

11.2

I2C Address

42

11.3

Write Register

42

11.4

Read Register

43

11.5

Write Command (Touchscreen Interface)

43

11.6

Read Channel (Touchscreen Interface)

44

12

REGISTERS DETAILED DESCRIPTION ...................................................................................... 46

13

APPLICATION INFORMATION ................................................................................................... 58

13.1

Typical Application Circuit

58

13.2

External Components Recommended Values

58

14

PACKAGING INFORMATION ..................................................................................................... 59

14.1

QFN Package

59

14.2

CSP Package

60

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