Datasheet > EVAL-AD7156EBZ

EVAL-AD7156EBZ

更新时间： 2024-02-24 07:37:22

品牌	Logo	应用领域
亚德诺 - ADI		转换器
页数	文件大小	规格书
28页	388K
描述
Ultralow Power, 1.8 V, 3 mm × 3 mm, 2-Channel Capacitance Converter

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EVAL-AD7156EBZ 数据手册

Ultralow Power, 1.8 V, 3 mm × 3 mm,

2-Channel Capacitance Converter

AD7156

FEATURES

GENERAL DESCRIPTION

Ultralow power

The AD7156 delivers a complete signal processing solution for

capacitive sensors, featuring an ultralow power converter with

fast response time.

Power supply voltage: 1.8 V to 3.6 V

Operation power supply current: 70 μA typical

Power-down current: 2 μA typical

Fast response time

Conversion time: 10 ms per channel

Wake-up time from serial interface: 300 μs

Adaptive environmental compensation

2 capacitance input channels

Sensor capacitance (C_SENS): 0 pF up to 13 pF

Sensitivity up to 3 fF

The AD7156 uses an Analog Devices, Inc., capacitance-to-

digital converter (CDC) technology, which combines features

important for interfacing to real sensors, such as high input

sensitivity and high tolerance of both input parasitic ground

capacitance and leakage current.

The integrated adaptive threshold algorithm compensates for

any variations in the sensor capacitance due to environmental

factors like humidity and temperature or due to changes in the

dielectric material over time.

2 modes of operation

Standalone with fixed settings

Interfaced to a microcontroller for user-defined settings

2 detection output flags

2-wire serial interface (I²C-compatible)

Operating temperature: −40°C to +85°C

10-lead LFCSP package (3 mm × 3 mm × 0.8 mm)

By default, the AD7156 operates in standalone mode using the

fixed power-up settings and indicates detection on two digital

outputs. Alternatively, the AD7156 can be interfaced to a micro-

controller via the serial interface, the internal registers can be

programmed with user-defined settings, and the data and status

can be read from the part.

APPLICATIONS

The AD7156 operates with a 1.8 V to 3.6 V power supply. It is

specified over the temperature range of −40°C to +85°C.

Buttons and switches

Proximity sensing

Contactless switching

Position detection

Level detection

Portable products

FUNCTIONAL BLOCK DIAGRAM

VDD

CIN1

SCL

SDA

DIGITAL

FILTER

SERIAL

INTERFACE

SENS1

Σ-Δ CDC

AD7156

EXC1

CIN2

MUX

THRESHOLD

OUT1

OUT2

SENS2

EXCITATION

EXC2

THRESHOLD

GND

Figure 1.

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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