SX8678ICSTRT datasheet(2/63 Pages) SEMTECH

Part #	SX8678ICSTRT

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

2

www.semtech.com

SX8677/SX8678

Haptics Enabled Multitouch 4/5-Wire

Resistive Touchscreen Controller with Proximity Sensing

Table of Contents

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

TYPICAL APPLICATIONS ..................................................................................................................... 1

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

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

1

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

1.1

Marking Information

4

1.1.1

SX8677

4

1.1.2

SX8678

4

1.2

Pin Diagrams

5

1.2.1

QFN Package

5

1.2.2

CSP Package

5

1.3

Pin Description

6

1.4

Block Diagram

6

2

ELECTRICAL CHARACTERISTICS............................................................................................... 8

2.1

Absolute Maximum Ratings

8

2.2

Thermal Characteristics

8

2.3

Electrical Specifications

8

3

TYPICAL OPERATING CHARACTERISTICS ............................................................................... 11

4

TOUCHSCREEN INTERFACE..................................................................................................... 12

4.1

Introduction

12

4.2

Coordinates Measurement

13

4.2.1

4-wire Touchscreen

13

4.2.2

5-wire Touchscreen

14

4.3

Pressure Measurement (4-wire only)

14

4.3.1

Bias Time (POWDLY)

15

4.4

Pen Detection

15

4.5

Multitouch Measurement (4-wire only)

16

4.6

Digital Processing

17

4.7

Host Operation

18

4.7.1

Overview

18

4.7.2

Manual Mode (MAN)

18

4.7.3

Pen Detect Mode (PENDET)

20

4.7.4

Pen Trigger Mode (PENTRG)

20

4.7.5

Maximum Throughput vs. TOUCHRATE setting

21

5

PROXIMITY SENSING INTERFACE (SX8677) ............................................................................ 23

5.1

Introduction

23

5.2

Analog Front-End (AFE)

24

5.2.1

Capacitive Sensing Basics

24

5.2.2

AFE Block Diagram

25

5.2.3

Capacitance-to-Voltage Conversion (C-to-V)

26

5.2.4

Shield Control

26

5.2.5

Offset Compensation

26

5.2.6

Analog-to-Digital Conversion (ADC)

27

5.3

Digital Processing

27

5.3.1

Overview

27

5.3.2

PROXRAW Update

28

5.3.3

PROXUSEFUL Update

29

5.3.4

PROXAVG Update

30

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