Description

The ATS682LSH is a Hall-effect integrated circuit and rare

earth pellet combination that provides a user-friendly solution

for true zero-speed digital gear-tooth sensing in two-wire

applications. This small package, with an optimized two-wire

leadframe, can be easily assembled and used in conjunction

with a wide variety of gear shapes and sizes.

The integrated circuit incorporates a dual-element Hall-effect

circuit and signal processing that switches in response to

differential magnetic signals created by ferrous gear teeth.

The circuitry contains a sophisticated digital circuit that

reduces magnet and system offsets, calibrates the gain for air

gap independent switchpoints and provides true zero-speed

operation.

Signal optimization occurs at power-up through the adjustment

of offset and gain and is and is maintained throughout operation

with the use of a running-mode calibration scheme. Running-

modecalibrationprovidesimmunityfromenvironmentaleffects

such as micro-oscillations of the sensed target or sudden air

gap changes.

Theregulatedcurrentoutputisconfiguredfortwo-wireinterface

circuitry and is ideally suited for obtaining speed information in

wheelspeedapplications.TheHallelementspacingisoptimized

for high resolution, small diameter targets. The package is lead

(Pb) free, with 100% matte tin lead frame plating.

ATS682-DS, Rev. 2

Features and Benefits

▪ True zero-speed operation

▪ Automatic Gain Control (AGC) for air gap independent

switchpoints

▪ Automatic Offset Adjustment (AOA) for signal processing

optimization

▪ Running-mode calibration for continuous optimization

▪ Precise duty cycle over operating temperature range

▪ Internal current regulator for two-wire operation

▪ Undervoltage lockout

▪ On-chip voltage regulator with wide operating voltage

range and stability in the presence of a variety of complex

load impedances

▪ Single chip IC for high reliability

Miniature, Two-Wire, True Zero Speed

Differential Peak-Detecting Sensor IC

Functional Block Diagram

ATS682LSH

Package: 4-pin SIP (suffix SH)

Not to scale

VCC

Automatic Offset

Control

AOA DAC

Hall

Amplifier

AGC DAC

Gain

Tracking

DAC

Peak Hold

Gain Control

Internal Regulator

Test Signals

GND

Test