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AD7143 Scheda tecnica(PDF) 3 Page - Analog Devices

Il numero della parte AD7143
Spiegazioni elettronici  Programmable Controller for Capacitance Touch Sensors
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Produttore elettronici  AD [Analog Devices]
Homepage  http://www.analog.com
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AD7143
Rev. 0 | Page 2 of 56
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


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