AD22157

更新时间： 2024-11-11 08:15:47

品牌	Logo	应用领域
亚德诺 - ADI		模拟IC 传感器信号电路
页数	文件大小	规格书
7页	276K
描述
Wheel Speed Sensor For ABS Systems

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PRELIMINARY TECHNICAL DATA

Wheel Speed Sensor For

ABS Systems

AD22157

Preliminary Technical Data

FEATURES

Functional Block Diagram

Speed and direction from 0Hz to 2500Hz

Air gap diagnostics

Vhigh

2-wire current-loop operation

Wide Operating Temperature Range

Functional during temperature excursions to 190C

Reverse Supply Protected (-30V)

Tracker 1

PWM

APPLICATIONS

Automotive

7mA

Wheel speed and direction sensing

Transmission speed sensing

Industrial

Tracker 2

Incremental position sensing

Proximity switching

Vlow

AD22157

GENERAL DESCRIPTION

associated with Hall cell characteristics. The sensor is compen-

sated to work optimally with SmCo magnets. The architecture

maximizes the advantages of fine line CMOS and high voltage

DMOS allowing the device to operate accurately in demanding

environments.

The AD22157 is a mixed signal magnetic field transducer

designed for applications where both speed sensing and direc-

tion sensing of a ferrous target wheel are required over a wide

speed range.

The device operates from a 2 wire high compliance current loop

and is suitable for continuous operation from -40C to 150C with

supplies up to +20 Vdc. The sensor is designed to remain func-

tional during voltage transients up to +27V.

The sensor output format is a current pulse from 7mA to 14mA

(the quiescent bias is 7mA) whose rising edge is accurately

placed relative to the edges of the target wheel. The pulse width

is determined by both target wheel direction and field strength.

The output pulse is coded in multiples of a well defined time

interval depending on direction and field strength in conform-

ance with industry standards currently being promoted by lead-

ing systems manufacturers.

Pulse widths corresponding to differential magnetic fields mea-

sured at the sensor of ∆B >4mT (normal operation),

2mT<∆B<4mT (low field range), and ∆B<2mT (very low field

range) are provided. Direction is indicated in the normal and

low ranges.

Principle features of the AD22157 include an adaptive differen-

tial zero crossing detector which accurately determines the posi-

tion of target wheel edges. This architecture eliminates the

effects of package and thermal stress on the Hall sensor array

resulting in 2% repeatability of the time interval from rising

edge to rising edge of the sensor output.

The sensor takes 4 edges from either power on or a stopped con-

dition to achieve full accuracy. The architecture employs digital

signal processing to provide robust functionality and eliminate

spurious or missing pulses under extreme conditions of EMC.

The AD22157 is housed in a 5 lead single-in-line (SIP) package

suitable for mounting with a back biasing magnet in a typical

wheel speed sensor assembly.

A fail safe stop signal repeating at approximately 1.5Hz is pro-

vided initially at power on, if the target wheel is stopped, or if

no dynamic signal is detected for some other reason.

The sensor combines integrated bulk Hall cell technology and

instrumentation circuitry to minimize temperature related drifts

REV. PrA

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 which may result from its use.

No license is granted by implication or otherwise under any patent or patent rights of

Analog Devices.

One Technology Way, P.O. Box 9106, Norwood, MA02062-9106,USA

www.analog.com

Analog Devices, Inc.,2001

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中文翻译

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