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AD7147WPACPZ-RL データシート(PDF) 3 Page - Analog Devices

部品番号 AD7147WPACPZ-RL
部品情報  CapTouch Programmable Controller
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メーカー  AD [Analog Devices]
ホームページ  http://www.analog.com
Logo AD - Analog Devices

AD7147WPACPZ-RL データシート(HTML) 3 Page - Analog Devices

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AD7147
Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 3
Specifications..................................................................................... 4
Average Current Specifications .................................................. 5
SPI Timing Specifications (AD7147) ......................................... 6
I2C Timing Specifications (AD7147-1)...................................... 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
BIAS Pin....................................................................................... 13
Operating Modes........................................................................ 13
Capacitiance-to-Digital Converter............................................... 15
Oversampling the CDC Output ............................................... 15
Capacitance Sensor Offset Control.......................................... 15
Conversion Sequencer ............................................................... 15
CDC Conversion Sequence Time ............................................ 17
CDC Conversion Results........................................................... 17
Capacitance Sensor Input Configuration.................................... 18
CINx Input Multiplexer Setup.................................................. 18
Single-Ended Connections to the CDC .................................. 18
Noncontact Proximity Detection ................................................. 19
Recalibration ............................................................................... 19
Proximity Sensitivity.................................................................. 19
FF_SKIP_CNT............................................................................ 22
Environmental Calibration ........................................................... 24
Capacitance Sensor Behavior Without Calibration............... 24
Threshold Equations.................................................................. 25
Capacitance Sensor Behavior with Calibration...................... 25
Slow FIFO.................................................................................... 25
SLOW_FILTER_UPDATE_LVL.............................................. 26
Adaptive Threshold and Sensitivity ............................................. 27
Interrupt Output............................................................................. 29
CDC Conversion-Complete Interrupt .................................... 29
Sensor-Touch Interrupt ............................................................. 29
GPIO INT Output Control ....................................................... 31
Outputs ............................................................................................ 33
ACSHIELD Output .......................................................................... 33
General-Purpose Input/Output (GPIO) ................................. 33
Using the GPIO to Turn On/Off an LED................................ 33
Serial Interface ................................................................................ 34
SPI Interface................................................................................ 34
I2C-Compatible Interface .......................................................... 36
VDRIVE Input ................................................................................. 38
PCB Design Guidelines ................................................................. 39
Capacitive Sensor Board Mechanical Specifications............. 39
Chip Scale Packages ................................................................... 39
Power-Up Sequence ....................................................................... 40
Typical Application Circuits ......................................................... 41
Register Map ................................................................................... 42
Detailed Register Descriptions ..................................................... 43
Bank 1 Registers ......................................................................... 43
Bank 2 Registers ......................................................................... 53
Bank 3 Registers ......................................................................... 58
Outline Dimensions....................................................................... 70
Ordering Guide .......................................................................... 70
Automotive Products................................................................. 70
Rev. E | Page 2 of 70


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