Datasheet > AD7142ACPZ-500RL71

AD7142ACPZ-500RL71

更新时间： 2024-11-20 12:47:31

品牌	Logo	应用领域
亚德诺 - ADI		传感器控制器
页数	文件大小	规格书
73页	844K
描述
Programmable Controller for Capacitance Touch Sensors

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Programmable Controller for

Capacitance Touch Sensors

AD7142

FUNCTIONAL BLOCK DIAGRAM

FEATURES

REF– REF+

TEST

Programmable capacitance-to-digital converter

36 ms update rate (@ 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)

I²C®-compatible serial interface (AD7142-1)

Separate V_DRIVElevel for serial interface

Interrupt output and GPIO

29 28

CIN0

CIN1

CIN2

CIN3

CIN4

CIN5

CIN6

CIN7

CIN8

CIN9

CIN10

CIN11

CIN12

CIN13

POWER-ON

RESET

LOGIC

14 AGND

16-BIT

CALIBRATION

ENGINE

Σ-Δ

CDC

CALIBRATION

RAM

DGND1

DGND2

CONTROL

AND

DATA

REGISTERS

SHIELD

SRC

250kHz

EXCITATION

SOURCE

32-lead, 5 mm x 5 mm LFCSP_VQ

2.6 V to 3.6 V supply voltage

SRC

Low operating current

Full power mode: less than 1 mA

INTERRUPT

AND GPIO

LOGIC

SERIAL INTERFACE

AND CONTROL LOGIC

DRIVE 20

GPIO

Low power mode: 50 μA

SDO/

SDA

SDI/

ADD0

CS/

ADD1

SCLK

INT

APPLICATIONS

Figure 1.

Personal music and multimedia players

Cell phones

Digital still cameras

Smart hand-held devices

Television, A/V, and remote controls

Gaming consoles

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 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 CDC has 14 inputs channeled through a switch matrix to a

16-bit, 250 kHz sigma-delta (∑-Δ) 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.

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

AD7142-1 has an I²C-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_VQ 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).

Rev. A

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 registeredtrademarks arethe property of their respective owners.

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

Tel: 781.329.4700

Fax: 781.461.3113

www.analog.com

12 3 4 5 6 7...73

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与AD7142ACPZ-500RL71相关器件

型号	品牌	获取价格	描述	数据表
AD7142ACPZ-REEL	ADI	获取价格	Programmable Controller for Capacitance Touch Sensors
AD7142ACPZ-REEL1	ADI	获取价格	Programmable Controller for Capacitance Touch Sensors
AD7143	ADI	获取价格	Programmable Controller for Capacitance Touch Sensors
AD7143ACPZ-1500RL7	ADI	获取价格	Programmable Controller for Capacitance Touch Sensors
AD7143ACPZ-1REEL	ADI	获取价格	Programmable Controller for Capacitance Touch Sensors
AD7147	ADI	获取价格	CapTouch⑩ Programmable Controller for Single-
AD7147_17	ADI	获取价格	CapTouch Programmable Controller
AD7147A	ADI	获取价格	CapTouch Programmable Controller
AD7147A-1ACBZ500R7	ADI	获取价格	CapTouch® Programmable Controller for Single-Electrode Capacitance Sensors
AD7147A-1ACBZ500RL7	ADI	获取价格	CapTouch Programmable Controller

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