поискавой системы для электроныых деталей |
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AD7148 датащи(PDF) 2 Page - Analog Devices |
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AD7148 датащи(HTML) 2 Page - Analog Devices |
2 / 56 page AD7148 Rev. 0 | Page 2 of 56 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 General Description ......................................................................... 1 Functional Block Diagram .............................................................. 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Typical Average Current in Low Power Mode ......................... 4 Maximum Average Current in Low Power Mode.................... 4 I2C Timing Specifications (AD7148-1) ..................................... 5 Absolute Maximum Ratings............................................................ 6 ESD Caution.................................................................................. 6 Pin Configuration and Function Descriptions............................. 7 Typical Performance Characteristics ............................................. 8 Theory of Operation ...................................................................... 10 Capacitance Sensing Theory..................................................... 10 BIAS Pin....................................................................................... 11 Operating Modes........................................................................ 11 Capacitance-to-Digital Converter................................................ 13 Oversampling the CDC Output ............................................... 13 Capacitance Sensor Offset Control.......................................... 13 Conversion Sequencer ............................................................... 13 CDC Conversion Sequence Time ............................................ 14 CDC Conversion Results........................................................... 15 Capacitance Sensor Input Configuration.................................... 16 CINx Input Multiplexer Setup .................................................. 16 Single-Ended Connections to the CDC .................................. 16 Noncontact Proximity Detection ................................................. 17 Recalibration ............................................................................... 18 Proximity Sensitivity.................................................................. 20 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 ACSHIELD Output .............................................................................. 27 I2C-Compatible Serial Interface ................................................... 28 VDRIVE Input ................................................................................. 30 PCB Design Guidelines ................................................................. 31 Capacitive Sensor Board Mechanical Specifications ............. 31 Chip Scale Packages ................................................................... 31 Power-Up Sequence ....................................................................... 32 Typical Application Circuit ........................................................... 33 Register Map ................................................................................... 34 Detailed Register Descriptions ..................................................... 35 Bank 1 Registers ......................................................................... 35 Bank 2 Registers ......................................................................... 43 Bank 3 Registers ......................................................................... 48 Outline Dimensions ....................................................................... 56 Ordering Guide .......................................................................... 56 REVISION HISTORY 12/07—Revision 0: Initial Version |
Аналогичный номер детали - AD7148 |
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Аналогичное описание - AD7148 |
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