SX8661 datasheet(3/88 Pages) SEMTECH

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ADVANCED COMMUNICATIONS & SENSING

DATASHEET

Revision v3.2, January 2011

www.semtech.com

SX8661

Low Power, Capacitive Button Touch and Proximity Controller

(8 sensors) with LED Drivers and Analog Output

3.16.3

Clearing

3.16.4

Example

3.17

Reset

3.17.1

Power up

3.17.2

RESETB

3.17.3

Software Reset

3.18

General Purpose Input and Outputs

3.18.1

GPP mode

3.18.2

GPO Dual Reporting

3.18.3

GPO Fading

3.18.4

Intensity index vs PWM pulse width

3.18.5

GPO Triple Reporting

PIN DESCRIPTIONS ..................................................................................................................... 37

4.1

Introduction

4.2

ASI pins

4.3

Host interface pins

4.4

Power management pins

4.5

General purpose IO pins

DETAILED CONFIGURATION DESCRIPTIONS .............................................................................. 43

5.1

Introduction

5.2

General Parameters

5.3

Capacitive Sensors Parameters

5.4

Proximity Parameters

5.5

Button Parameters

5.6

Analog Output Interface Parameters

5.7

Buzzer Parameters

5.8

Mapping Parameters

5.9

GPIO Parameters

I2C INTERFACE........................................................................................................................... 68

6.1

I2C Write

6.2

I2C read

6.3

I2C Registers Overview

6.4

Status Registers

6.5

Control Registers

6.6

SPM Gateway Registers

6.6.1

SPM Write Sequence

6.6.2

SPM Read Sequence

6.7

NVM burn

APPLICATION INFORMATION ...................................................................................................... 79

7.1

Triple proximity reporting

7.2

Dual proximity reporting

7.2.1

SPM file (application two AOI, dual proximity reporting)

7.3

Example of Touch+Proximity Module

7.3.1

Overview

7.3.2

Operation

7.3.3

Performance

7.3.4

Schematics

7.3.5

Layout

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