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AD7142 Datasheet

  • AD7142

  • Programmable Capacitance-to-Digital Converter with Environme...

  • 66頁(yè)

  • AD

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AD7142
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
SPI Timing Specifications (AD7142)......................................... 5
I
2
C Timing Specifications (AD7142-1) ..................................... 6
Absolute Maximum Ratings............................................................ 7
ESD Caution.................................................................................. 7
Pin Configurations and Function Descriptions ........................... 8
Typical Performance Characteristics ............................................. 9
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
FIFO Control .............................................................................. 20
Environmental Calibration ........................................................... 22
Capacitance Sensor Behavior Without Calibration............... 22
Capacitance Sensor Behavior with Calibration...................... 23
Adaptive Threshold and Sensitivity ............................................. 24
Interrupt Output............................................................................. 25
CDC Conversion Complete Interrupt..................................... 25
Sensor Touch Interrupt.............................................................. 25
GPIO INT Output Control ....................................................... 27
Outputs ............................................................................................ 29
Excitation Source........................................................................ 29
C
SHIELD
Output ............................................................................. 29
GPIO ............................................................................................ 29
Using the GPIO to turn on/off an LED................................... 29
Serial Interface ................................................................................ 30
SPI Interface ................................................................................ 30
I
2
C Compatible Interface........................................................... 32
V
DRIVE
Input ................................................................................. 34
PCB Design Guidelines ................................................................. 35
Capacitive Sensor Board Mechanical Specifications ............. 35
Chip Scale Packages ................................................................... 35
Power-Up Sequence ....................................................................... 36
Typical Application Circuits ......................................................... 37
Register Map ................................................................................... 38
Detailed Register Descriptions ..................................................... 39
Bank 1 Registers ......................................................................... 39
Bank 2 Registers ......................................................................... 48
Bank 3 Registers ......................................................................... 54
Outline Dimensions ....................................................................... 66
Ordering Guide .......................................................................... 66
REVISION HISTORY
6/06鈥擱evision 0: Initial Version
Rev. 0 | Page 2 of 68

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