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AD7142 Arkusz danych(PDF) 3 Page - Analog Devices

Numer części AD7142
Szczegółowy opis  Programmable Controller for Capacitance Touch Sensors
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Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
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AD7142 Arkusz danych(HTML) 3 Page - Analog Devices

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AD7142
Rev. A | Page 2 of 72
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


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