AD7150BRMZ-REEL View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

AD7150BRMZ-REEL

Ultralow Power, 2-Channel, Capacitance Converter for Proximity Sensing

Analog Devices 

Data Sheet

Ultralow Power, 2-Channel, Capacitance

Converter for Proximity Sensing

AD7150

FEATURES

Ultralow power

2.7 V to 3.6 V, 100 μA

Response time: 10 ms

Adaptive environmental compensation

2 independent capacitance input channels

Sensor capacitance (CSENS) 0 pF up to 13 pF

Sensitivity to 1 fF

EMC tested

2 modes of operation

Standalone with fixed settings

Interfaced to a microcontroller for user-defined settings

2 proximity detection output flags

2-wire serial interface (I2C compatible)

Operating temperature

−40°C to +85°C

10-lead MSOP package

APPLICATIONS

Proximity sensing

Contactless switching

Position detection

Level detection

GENERAL DESCRIPTION

The AD7150 delivers a complete signal processing solution for

capacitive proximity sensors, featuring an ultralow power

converter with fast response time. The AD7151 is a single-

channel, lower power alternative to the AD7150.

The AD7150 uses 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.

By default, the AD7150 operates in standalone mode using the

fixed power-up settings and indicates detection on two digital

outputs. Alternatively, the AD7150 can be interfaced to a

microcontroller 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.

The AD7150 operates with a 2.7 V to 3.6 V power supply. It is

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

CSENS1

CSENS2

CIN1

EXC1

CIN2

EXC2

FUNCTIONAL BLOCK DIAGRAM

VDD

Σ-∆ CDC

MUX

AD7150

DIGITAL

FILTER

THRESHOLD

SERIAL

INTERFACE

EXCITATION

THRESHOLD

GND

Figure 1.

SCL

SDA

OUT1

OUT2

Rev. A

Document Feedback

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 registered trademarks are the property of their respective owners.

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

Tel: 781.329.4700 ©2007–2019 Analog Devices, Inc. All rights reserved.

Technical Support

www.analog.com

Share Link: