SX8654EVK datasheet(2/61 Pages) SEMTECH

Part #	SX8654EVK

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

2

www.semtech.com

SX8657/SX8658

Haptics Enabled 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

SX8657

4

1.1.2

SX8658

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

Digital Processing

16

4.6

Host Operation

18

4.6.1

Overview

18

4.6.2

Manual Mode (MAN)

18

4.6.3

Pen Detect Mode (PENDET)

19

4.6.4

Pen Trigger Mode (PENTRG)

19

4.6.5

Maximum Throughput vs. TOUCHRATE setting

20

5

PROXIMITY SENSING INTERFACE (SX8657) ............................................................................ 22

5.1

Introduction

22

5.2

Analog Front-End (AFE)

23

5.2.1

Capacitive Sensing Basics

23

5.2.2

AFE Block Diagram

24

5.2.3

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

25

5.2.4

Shield Control

25

5.2.5

Offset Compensation

25

5.2.6

Analog-to-Digital Conversion (ADC)

26

5.3

Digital Processing

26

5.3.1

Overview

26

5.3.2

PROXRAW Update

27

5.3.3

PROXUSEFUL Update

28

5.3.4

PROXAVG Update

29

5.3.5

PROXDIFF Update

31

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