AD7142ACPZ-1500RL71 datasheet, PDF

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AD7142ACPZ-1500RL71: DescriptionProgrammable Controller for Capacitance Touch Sensors; File Size1MB，71 Pages; ManufacturerADI; Websitehttps://www.analog.com

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AD7142ACPZ-1500RL71 Overview

Programmable Controller for Capacitance Touch Sensors

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Data Sheet

FEATURES

Programmable capacitance-to-digital converter

36 ms update rate (at maximum sequence length)

Better than 1 fF resolution

14 capacitance sensor input channels

No external RC tuning components required

Automatic conversion sequencer

On-chip automatic calibration logic

Automatic compensation for environmental changes

Automatic adaptive threshold and sensitivity levels

On-chip RAM to store calibration data

SPI-compatible serial interface (AD7142)

C-compatible serial interface (AD7142-1)

Separate V

DRIVE

level for serial interface

Interrupt output and GPIO

32-lead, 5 mm x 5 mm LFCSP

2.6 V to 3.6 V supply voltage

Low operating current

Full power mode: less than 1 mA

Low power mode: 50 µA

Programmable Controller for

Capacitance Touch Sensors

AD7142

FUNCTIONAL BLOCK DIAGRAM

REF–

REF+

TEST

CIN0

CIN1

CIN2

CIN3

CIN4

CIN5

CIN6

CIN7

CIN8

CIN9

CIN10

CIN11

CIN12

CIN13

POWER-ON

RESET

LOGIC

AGND

SWITCH

MATRIX

16-BIT

Σ-Δ

CDC

CALIBRATION

ENGINE

DGND1

DGND2

CALIBRATION

RAM

CONTROL

AND

DATA

REGISTERS

SHIELD

SRC

250kHz

EXCITATION

SOURCE

DRIVE

SERIAL INTERFACE

AND CONTROL LOGIC

INTERRUPT

AND GPIO

LOGIC

GPIO

APPLICATIONS

Personal music and multimedia players

Cell phones

Digital still cameras

Smart hand-held devices

Television, A/V, and remote controls

Gaming consoles

SDO/

SDA

SDI/ SCLK CS/

ADD0

ADD1

INT

Figure 1.

GENERAL DESCRIPTION

The AD7142 and AD7142-1 are integrated capacitance-to-

digital converters (CDCs) with on-chip environmental

calibration for use in systems requiring a novel user input

method. The AD7142 and AD7142-1 can interface to external

capacitance sensors implementing functions such as capacitive

buttons, scroll bars, or wheels.

The CDC has 14 inputs channeled through a switch matrix to a

16-bit, 250 kHz sigma-delta (∑-∆) capacitance-to-digital

converter. The CDC is capable of sensing changes in the

capacitance of the external sensors and uses this information to

arranged as a series of buttons, as a scroll bar or wheel, or as a

combination of sensor types. By programming the registers, the

user has full control over the CDC setup. High resolution

sensors require minor software to run on the host processor.

Rev. B

The AD7142 and AD7142-1 have on-chip calibration logic to

account for changes in the ambient environment. The

calibration sequence is performed automatically and at

continuous intervals, when the sensors are not touched. This

ensures that there are no false or nonregistering touches on the

external sensors due to a changing environment.

The AD7142 has an SPI-compatible serial interface, and the

AD7142-1 has an I

C-compatible serial interface. Both parts

have an interrupt output, as well as a general-purpose input/

output (GPIO).

The AD7142 and AD7142-1 are available in a 32-lead, 5 mm ×

5 mm LFCSP and operate from a 2.6 V to 3.6 V supply. The

operating current consumption is less than 1 mA, falling to

50 µA in low power mode (conversion interval of 400 ms).

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

rights of third parties that may result from its use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registered trademarks are the property of their respective owners.

Document Feedback

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Technical Support

www.analog.com

05702-001

AD7142

TABLE OF CONTENTS

Features .............................................................................................. 1

Applications ....................................................................................... 1

Functional Block Diagram .............................................................. 1

General Description ......................................................................... 1

Revision History ............................................................................... 3

Specifications..................................................................................... 4

SPI Timing Specifications (AD7142) ......................................... 6

C 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 ............................................................................ 21

Environmental Calibration ........................................................... 23

Capacitance Sensor Behavior Without Calibration ............... 23

Data Sheet

Capacitance Sensor Behavior with Calibration ...................... 23

Slow FIFO .................................................................................... 24

SLOW_FILTER_UPDATE_LVL .............................................. 24

Adaptive Threshold and Sensitivity ............................................. 25

Interrupt Output ............................................................................. 27

CDC Conversion Complete Interrupt ..................................... 27

Sensor Touch Interrupt.............................................................. 27

GPIO INT Output Control ....................................................... 29

Outputs ............................................................................................ 31

Excitation Source ........................................................................ 31

SHIELD

Output ............................................................................. 31

GPIO ............................................................................................ 31

Using the GPIO to Turn On/Off an LED ................................ 31

Serial Interface ................................................................................ 32

SPI Interface ................................................................................ 32

C Compatible Interface ........................................................... 34

DRIVE

Input ................................................................................. 36

PCB Design Guidelines ................................................................. 37

Capacitive Sensor Board Mechanical Specifications ............. 37

Chip Scale Packages ................................................................... 37

Power-Up Sequence ....................................................................... 38

Typical Application Circuits ......................................................... 39

Detailed Register Descriptions ..................................................... 41

Bank 1 Registers ......................................................................... 41

Bank 2 Registers ......................................................................... 51

Bank 3 Registers ......................................................................... 58

Outline Dimensions ....................................................................... 70

Ordering Guide .......................................................................... 70

Rev. B | Page 2 of 70

Data Sheet

REVISION HISTORY

9/2017—Rev. A to Rev. B

Changes to Figure 6, Figure 7, and Table 7 .................................... 9

Changes to Figure 59 ......................................................................40

Updated Outline Dimensions ........................................................70

Changes to Ordering Guide ...........................................................70

1/2007—Rev. 0 to Rev. A

Updated Format.................................................................. Universal

Changes to Data Sheet Title ............................................................. 1

Inserted Figure 5................................................................................ 8

Changes to Figure 18 ......................................................................12

Changes to Operating Modes Section ..........................................13

Changes to CIN Input Multiplexer Setup Section ......................14

Changes to Table 9 and Conversion Sequencer Section ............15

Changes to Noncontact Proximity Detection Section ...............18

Changes to Recalibration Section and Table 12 ..........................18

Deleted FIFO Control Section .......................................................19

Changes to Figure 31 and Table 13 ...............................................20

Changes to Figure 32 ......................................................................21

AD7142

Changes to Capacitance Sensor Behavior with Calibration

Section .............................................................................................. 22

Added Slow FIFO and SLOW_FILTER_UPDATE_LVL

Section .............................................................................................. 23

Changes to Adaptive Threshold and Sensitivity Section ........... 24

Inserted Figure 37 and Table 13 .................................................... 25

Deleted Figure 42 ............................................................................ 29

Changes to C

SHIELD

Output Section ............................................... 30

Changes to Figure 55 ...................................................................... 36

Changes to Power-up Sequence Section ...................................... 37

Changes to Figure 58 ...................................................................... 38

Changes to Table 21 ........................................................................ 42

Changes to Table 24 ........................................................................ 43

Changes to Table 25 ........................................................................ 44

Changes to Table 29 ........................................................................ 48

Changes to Table 31 ........................................................................ 49

6/2006—Revision 0: Initial Version

Rev. B | Page 3 of 70

AD7142ACPZ-1500RL71 Related Products

	AD7142ACPZ-1500RL71	AD7142ACPZ-1REEL1	AD7142ACPZ-500RL71	AD7142ACPZ-REEL1	EVAL-AD7142-1EBZ1	EVAL-AD7142EBZ1
Description	Programmable Controller for Capacitance Touch Sensors	Programmable Controller for Capacitance Touch Sensors	Programmable Controller for Capacitance Touch Sensors	Programmable Controller for Capacitance Touch Sensors	Programmable Controller for Capacitance Touch Sensors	Programmable Controller for Capacitance Touch Sensors

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