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AD7143ACPZ-1REEL

Programmable Controller for Capacitance Touch Sensors

Analog Devices 

AD7143

TABLE OF CONTENTS

Features .............................................................................................. 1

Applications....................................................................................... 1

Functional Block Diagram .............................................................. 1

General Description ......................................................................... 1

Revision History ............................................................................... 2

Specifications..................................................................................... 3

I2C Timing Specifications............................................................ 5

Absolute Maximum Ratings............................................................ 6

ESD Caution.................................................................................. 6

Pin Configurations and Function Descriptions ........................... 7

Typical Performance Characteristics ............................................. 8

Theory of Operation ...................................................................... 11

Capacitance Sensing Theory..................................................... 11

Operating Modes........................................................................ 12

Capacitance Sensor Input Configuration.................................... 13

CIN Input Multiplexer Setup .................................................... 13

Capacitiance-to-Digital Converter............................................... 14

Oversampling the CDC Output ............................................... 14

Capacitance Sensor Offset Control.......................................... 14

Conversion Sequencer ............................................................... 14

CDC Conversion Sequence Time ............................................ 15

CDC Conversion Results........................................................... 16

Noncontact Proximity Detection ................................................. 17

Recalibration ............................................................................... 17

Proximity Sensitivity.................................................................. 17

Slow FIFO.................................................................................... 19

SLOW_FILTER_UPDATE_LVL .............................................. 19

Environmental Calibration ........................................................... 22

Capacitance Sensor Behavior without Calibration................ 22

Capacitance Sensor Behavior with Calibration...................... 23

Adaptive Threshold and Sensitivity ............................................. 25

Interrupt Output............................................................................. 26

CDC Conversion Complete Interrupt..................................... 26

Sensor Touch Interrupt.............................................................. 26

Serial Interface ................................................................................ 28

I2C Compatible Interface........................................................... 28

PCB Design Guidelines ................................................................. 31

Capacitive Sensor Board Mechanical Specifications ............. 31

Chip Scale Packages ................................................................... 31

Power-Up Sequence ....................................................................... 32

Typical Application Circuits ......................................................... 33

Register Map ................................................................................... 34

Detailed Register Descriptions ..................................................... 35

Bank 1 Registers ......................................................................... 35

Bank 2 Registers ......................................................................... 43

Bank 3 Registers ......................................................................... 47

Outline Dimensions ....................................................................... 55

Ordering Guide .......................................................................... 55

REVISION HISTORY

1/07—Revision 0: Initial Version

Rev. 0 | Page 2 of 56

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