Datasheet > AD7148

AD7148

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
56页	855K
描述
Programmable Touch Controller for Single Electrode Capacitance Sensors

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AD7148 数据手册

Programmable Touch Controller for

Single Electrode Capacitance Sensors

AD7148

FUNCTIONAL BLOCK DIAGRAM

FEATURES

SHIELD

GND

BIAS

Programmable capacitance-to-digital converter (CDC)

Femtofarad (fF) resolution

8 capacitance sensor inputs

AD7148

CIN0

POWER-ON

RESET

LOGIC

25 ms update rate, all 8 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

I²C-compatible serial interface

EXCITATION

SOURCE

CIN1 14

CIN2

CIN3

CIN4

CIN5

CIN6

CIN7

CALIBRATION

RAM

16-BIT

Σ-Δ

CDC

CALIBRATION

ENGINE

CONTROL

AND

DATA

REGISTERS

Separate V_DRIVElevel for serial interface

Interrupt output

16-lead, 4 mm × 4 mm LFCSP

2.6 V to 3.3 V supply voltage

Low operating current

INTERRUPT

AND GPIO

LOGIC

SERIAL INTERFACE

AND CONTROL LOGIC

Full power mode: 1 mA

Low power mode: 21.5 μA

SDA

SCLK

INT

DRIVE

APPLICATIONS

Figure 1.

Cell phones

Personal music and multimedia players

Smart handheld devices

Television, A/V, and remote controls

Gaming consoles

Digital still cameras

GENERAL DESCRIPTION

The AD7148 is designed for single electrode capacitance sensors

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

noise pickup in the sensor. For floating, or two, electrode sensors,

use the AD7143.

The AD7148 is designed for use with capacitance sensors imple-

menting functions such as buttons, scroll bars, and wheels.

The sensors need only one PCB layer, enabling ultrathin

applications.

The AD7148 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.

The AD7148 is an integrated capacitance-to-digital converter

(CDC) with on-chip environmental calibration. The CDC has

eight 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. The external

sensors can be 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.

The AD7148 has an I²C®-compatible serial interface, as well as

an interrupt output. There is a V_DRIVEpin to set the voltage level

for the serial interface independent of V_CC

High resolution sensors require minimal software to run on the

host processor.

The AD7148 is available in a 16-lead, 4 mm × 4 mm LFCSP and

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

consumption in low power mode is typically 26 μA.

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AD7148相关器件

型号	品牌	获取价格	描述	数据表
AD7148ACPZ-1500RL7	ADI	获取价格	Programmable Touch Controller for Single Electrode Capacitance Sensors
AD7148ACPZ-1REEL	ADI	获取价格	Programmable Touch Controller for Single Electrode Capacitance Sensors
AD7148ACPZ-1REEL1	ADI	获取价格	IC SPECIALTY CONSUMER CIRCUIT, PQCC16, 4 X 4 MM, ROHS COMPLIANT, MO-220-VGGC, LFCSP-16, Co
AD7150	ADI	获取价格	Ultra Low Power, 2 Channel, Capacitance Converter for Proximity Sensing
AD7150BRMZ	ADI	获取价格	Ultra-Low Power, 2-Channel, Capacitance Converter for Proximity Sensing
AD7150BRMZ-REEL	ADI	获取价格	Ultra-Low Power, 2-Channel, Capacitance Converter for Proximity Sensing
AD7151	ADI	获取价格	Ultra-Low Power, 1-Channel, Capacitance Converter for Proximity Sensing
AD7151BRMZ	ADI	获取价格	Ultra-Low Power, 1-Channel, Capacitance Converter for Proximity Sensing
AD7151BRMZ-REEL	ADI	获取价格	Ultra-Low Power, 1-Channel, Capacitance Converter for Proximity Sensing
AD7152	ADI	获取价格	12-Bit Capacitance-to-Digital Converter

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