Datasheet > AD7143ACPZ-1REEL

AD7143ACPZ-1REEL

更新时间： 2024-11-20 04:04:15

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
56页	697K
描述
Programmable Controller for Capacitance Touch Sensors

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AD7143ACPZ-1REEL 数据手册

Programmable Controller for

Capacitance Touch Sensors

AD7143

FEATURES

FUNCTIONAL BLOCK DIAGRAM

Programmable capacitance-to-digital converter

25 ms update rate (@ maximum sequence length)

Better than 1 fF resolution

8 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

I²C®-compatible serial interface

Separate VDRIVE level for serial interface

Interrupt output for host controller

16-lead, 4 mm x 4 mm LFCSP-VQ

POWER-ON

RESET

AD7143

CIN0

CIN1

CIN2

CIN3

CIN4

CIN5

CIN6

CIN7

LOGIC

CALIBRA-

TION

ENGINE

16-BIT

Σ-Δ

CDC

CALIBRA-

TION

VCC

GND

CONTROL

AND

RAM

DATA

REGISTERS

250kHz

CSHIELD

SRC

EXCITATION

SOURCE

INTERRUPT

LOGIC

I C SERIAL INTERFACE

AND CONTROL LOGIC

2.6 V to 3.6 V supply voltage

Low operating current

Full power mode: less than 1 mA

VDRIVE SDA SCLK

INT

Low power mode: 50 μA

Figure 1.

APPLICATIONS

Personal music and multimedia players

Cell phones

Digital still cameras

Smart hand-held devices

Television, A/V, and remote controls

Gaming consoles

The AD7143 has on-chip calibration logic to account for

changes in the ambient environment. The calibration sequence is

performed automatically and at continuous intervals, while the

sensors are not touched. This ensures that there are no false or

nonregistering touches on the external sensors due to a

changing environment.

GENERAL DESCRIPTION

The AD7143 is an integrated capacitance-to-digital converter

(CDC) with on-chip environmental calibration for use in

systems requiring a novel user input method. The AD7143

interfaces to external capacitance sensors implementing

functions, such as capacitive buttons, scroll bars, and

scroll wheels.

The AD7143 has an I²C-compatible serial interface and a

separate VDRIVE pin for I²C serial interface operating voltages

between 1.65 V and 3.6 V.

The CDC has eight 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 software to run on the host processor.

The AD7143 is available in a 16-lead, 4 mm × 4 mm LFCSP-VQ

and operates 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. 0

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

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