AD7142ACPZ-1500RL7(RevA) 查看數據表（PDF） - Analog Devices

零件编号

产品描述 (功能)

生产厂家

AD7142ACPZ-1500RL7
(Rev.:RevA)

Programmable Controller for Capacitance Touch Sensors

Analog Devices 

AD7142

TABLE OF CONTENTS

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

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

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

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

Revision History ............................................................................... 3

Specifications..................................................................................... 4

SPI Timing Specifications (AD7142)......................................... 6

I2C Timing Specifications (AD7142-1) ..................................... 7

Absolute Maximum Ratings............................................................ 8

ESD Caution.................................................................................. 8

Pin Configurations and Function Descriptions ........................... 9

Typical Performance Characteristics ........................................... 10

Theory of Operation ...................................................................... 12

Capacitance Sensing Theory..................................................... 12

Operating Modes........................................................................ 13

Capacitance Sensor Input Configuration.................................... 14

CIN Input Multiplexer Setup .................................................... 14

Capacitance-to-Digital Converter................................................ 15

Oversampling the CDC Output ............................................... 15

Capacitance Sensor Offset Control.......................................... 15

Conversion Sequencer ............................................................... 15

CDC Conversion Sequence Time ............................................ 16

CDC Conversion Results........................................................... 17

Noncontact Proximity Detection ................................................. 18

Recalibration ............................................................................... 18

Proximity Sensitivity .................................................................. 18

FF_SKIP_CNT............................................................................ 20

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

Capacitance Sensor Behavior Without Calibration............... 22

Capacitance Sensor Behavior with Calibration...................... 22

SLOW FIFO ................................................................................ 23

SLOW_FILTER_UPDATE_LVL .............................................. 23

Adaptive Threshold and Sensitivity ............................................. 24

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

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

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

GPIO INT Output Control ....................................................... 28

Outputs ............................................................................................ 30

Excitation Source........................................................................ 30

CSHIELD Output ............................................................................. 30

GPIO ............................................................................................ 30

Using the GPIO to turn on/off an LED................................... 30

Serial Interface ................................................................................ 31

SPI Interface ................................................................................ 31

I2C Compatible Interface........................................................... 33

VDRIVE Input ................................................................................. 35

PCB Design Guidelines ................................................................. 36

Capacitive Sensor Board Mechanical Specifications ............. 36

Chip Scale Packages ................................................................... 36

Power-Up Sequence ....................................................................... 37

Typical Application Circuits ......................................................... 38

Register Map ................................................................................... 39

Detailed Register Descriptions ..................................................... 40

Bank 1 Registers ......................................................................... 40

Bank 2 Registers ......................................................................... 50

Bank 3 Registers ......................................................................... 57

Outline Dimensions ....................................................................... 69

Ordering Guide .......................................................................... 69

Rev. A | Page 2 of 72

Share Link: