SX8674ICSTRT datasheet(3/64 Pages) SEMTECH

Part #	SX8674ICSTRT

Description	Haptics Enabled Multitouch 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

SX8674/SX8675/SX8676

Haptics Enabled Multitouch 4/5-Wire

Resistive Touchscreen Controller with Proximity Sensing

5.3.4

PROXAVG Update

31

5.3.5

PROXDIFF Update

33

5.3.6

PROXSTAT Update

33

5.4

Host Operation

34

5.4.1

General Description

34

5.4.2

Proximity Sensing vs Touch Operations

34

5.4.3

Minimum Scan Period (i.e. PROXSCANPERIOD)

36

6

HAPTICS INTERFACE (SX8674/75) .......................................................................................... 37

6.1

Introduction

37

6.2

ERM Load

37

6.2.1

Introduction

37

6.2.2

PWM Mode

38

6.2.3

I2C Mode

38

6.3

LRA Load

38

6.3.1

Introduction

38

6.3.2

PWM Mode

39

6.3.3

I2C Mode

39

6.4

Short-Circuit Protection

39

7

TEMPERATURE SENSOR.......................................................................................................... 40

8

INTERRUPT (NIRQ) .................................................................................................................. 41

8.1

Introduction

41

8.2

Registers Overview

41

8.2.1

RegIrqMsk

41

8.2.2

RegIrqSrc

41

8.2.3

RegStat

41

8.3

Host Procedure

41

9

AUXILIARY PINS (AUX1/AUX2/AUX3)...................................................................................... 42

10

RESET...................................................................................................................................... 43

10.1

Hardware (POR and NRST)

43

10.2

Software (RegReset)

43

10.3

ESD Event (RESETSTAT)

43

11

I2C INTERFACE........................................................................................................................ 44

11.1

Introduction

44

11.2

I2C Address

44

11.3

Write Register

44

11.4

Read Register

45

11.5

Write Command (Touchscreen Interface)

45

11.6

Read Channel (Touchscreen Interface)

46

12

REGISTERS DETAILED DESCRIPTION ...................................................................................... 48

13

APPLICATION INFORMATION ................................................................................................... 60

13.1

Typical Application Circuit

60

13.2

External Components Recommended Values

60

13.3

Multitouch Gestures

60

13.3.1

Pinch/Stretch

60

13.3.2

Rotate

61

14

PACKAGING INFORMATION ..................................................................................................... 62

14.1

QFN Package

62

14.2

CSP Package

63

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