Datasheet > AD7147

AD7147

更新时间： 2024-11-24 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
68页	940K
描述
CapTouch⑩ Programmable Controller for Single-Electrode Capacitance Sensors

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AD7147 数据手册

CapTouch^™Programmable Controller for

Single-Electrode Capacitance Sensors

AD7147

FUNCTIONAL BLOCK DIAGRAM

FEATURES

GND

BIAS

SHIELD

Programmable capacitance-to-digital converter (CDC)

Femtofarad resolution

POWER-ON

RESET LOGIC

13 capacitance sensor inputs

CIN0

CIN1

CIN2

CIN3

CIN4

CIN5

CIN6

CIN7

CIN8

CIN9

CIN10

CIN11

CIN12

9 ms update rate, all 13 sensor inputs

No external RC 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-peripheral-interface-compatible)

serial interface (AD7147)

I²C-compatible serial interface (AD7147-1)

Separate V_DRIVElevel for serial interface

Interrupt output and general-purpose input/output (GPIO)

24-lead, 4 mm × 4 mm LFCSP

EXCITATION

SOURCE

CALIBRATION

AD7147

RAM

16-BIT

Σ-Δ

CDC

CALIBRATION

ENGINE

CONTROL

AND DATA

REGISTERS

2.6 V to 3.3 V supply voltage

INTERRUPT

AND GPIO

LOGIC

Low operating current

Full power mode: 1 mA

SERIAL INTERFACE

AND CONTROL LOGIC

GPIO

DRIVE

Low power mode: 21.5 μA

SDO/ SDI/ SCLK CS/

SDA ADD0 ADD1

INT

APPLICATIONS

Cell phones

Figure 1. AD7147 Block Diagram

Personal music and multimedia players

Smart handheld devices

Television, A/V, and remote controls

Gaming consoles

The AD7147 is designed for single-electrode capacitance

sensors (grounded sensors). There is an active shield output to

minimize noise pickup in the sensor.

Digital still cameras

The AD7147 has on-chip calibration logic to compensate for

changes in the ambient environment. The calibration sequence

is performed automatically and at continuous intervals as long

as 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 AD7147 is designed for use with capacitance sensors

implementing functions such as buttons, scroll bars, and

wheels. The sensors need only one PCB layer, enabling ultra

thin applications.

The AD7147 is an integrated CDC with on-chip environmental

calibration. The CDC has 13 inputs channeled through a switch

matrix to a 16-bit, 250 kHz sigma-delta (∑-Δ) converter. The CDC

is capable of sensing changes in the capacitance of the external

sensors and uses this information to register a sensor activation.

By programming the registers, the user has full control over the

CDC setup.

The AD7147 has an SPI-compatible serial interface, and the

AD7147-1 has an I²C®-compatible serial interface. Both parts have

an interrupt output, as well as a GPIO. There is a V_DRIVEpin to set

the voltage level for the serial interface independent of V_CC

The AD7147 is available in a 24-lead, 4 mm × 4 mm LFCSP and

operates from a 2.6 V to 3.6 V supply. The operating current con-

sumption in low power mode is typically 26 μA for 13 sensors.

High resolution sensors require minor software to run on the

host processor.

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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与AD7147相关器件

型号	品牌	获取价格	描述	数据表
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
AD7147A-1ACBZ-RL	ADI	获取价格	CapTouch Programmable Controller
AD7147AACBZ500RL7	ADI	获取价格	CapTouch Programmable Controller
AD7147AACBZ-500RL7	ADI	获取价格	CapTouch® Programmable Controller for Single-Electrode Capacitance Sensors
AD7147AACBZ-RL	ADI	获取价格	CapTouch Programmable Controller
AD7147ACPZ-1500RL7	ADI	获取价格	CapTouch⑩ Programmable Controller for Single-
AD7147ACPZ-1REEL	ROCHESTER	获取价格	SPECIALTY CONSUMER CIRCUIT, QCC24, 4 X 4 MM, ROHS COMPLIANT, MO-220VGGD-8, LFCSP-24

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