SX8674ICSTRT datasheet(2/64 Pages) SEMTECH

2 / 64 page

ADVANCED COMMUNICATIONS & SENSING

Rev 1 – 25

th July 2011

www.semtech.com

SX8674/SX8675/SX8676

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

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

1.1

Marking Information

1.1.1

SX8674

1.1.2

SX8675

1.1.3

SX8676

1.2

Pin Diagrams

1.2.1

QFN Package

1.2.2

CSP Package

1.3

Pin Description

1.4

Block Diagram

ELECTRICAL CHARACTERISTICS............................................................................................... 9

2.1

Absolute Maximum Ratings

2.2

Thermal Characteristics

2.3

Electrical Specifications

TYPICAL OPERATING CHARACTERISTICS ............................................................................... 12

TOUCHSCREEN INTERFACE..................................................................................................... 13

4.1

Introduction

4.2

Coordinates Measurement

4.2.1

4-wire Touchscreen

4.2.2

5-wire Touchscreen

4.3

Pressure Measurement (4-wire only)

4.3.1

Bias Time (POWDLY)

4.4

Pen Detection

4.5

Multitouch Measurement (4-wire only)

4.6

Digital Processing

4.7

Host Operation

4.7.1

Overview

4.7.2

Manual Mode (MAN)

4.7.3

Pen Detect Mode (PENDET)

4.7.4

Pen Trigger Mode (PENTRG)

4.7.5

Maximum Throughput vs. TOUCHRATE setting

PROXIMITY SENSING INTERFACE (SX8674/76) ....................................................................... 24

5.1

Introduction

5.2

Analog Front-End (AFE)

5.2.1

Capacitive Sensing Basics

5.2.2

AFE Block Diagram

5.2.3

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

5.2.4

Shield Control

5.2.5

Offset Compensation

5.2.6

Analog-to-Digital Conversion (ADC)

5.3

Digital Processing

5.3.1

Overview

5.3.2

PROXRAW Update

5.3.3

PROXUSEFUL Update

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