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AD7142 Arkusz danych(PDF) 3 Page - Analog Devices |
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AD7142 Arkusz danych(HTML) 3 Page - Analog Devices |
3 / 73 page 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 |
Podobny numer części - AD7142_15 |
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Podobny opis - AD7142_15 |
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