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AD7143 Scheda tecnica(PDF) 3 Page - Analog Devices |
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AD7143 Scheda tecnica(HTML) 3 Page - Analog Devices |
3 / 57 page 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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Descrizione simile - AD7143_17 |
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