ATS642LSH

ATS642LSH-DS

Worcester, Massachusetts 01615-0036 (508) 853-5000

115 Northeast Cutoff, Box 15036

www.allegromicro.com

Allegro MicroSystems, Inc.

ABSOLUTE MAXIMUM RATINGS

Operating Temperature

• Running mode calibration for continu-

ous optimization

• Single chip IC for high reliability

• Internal current regulator for 2-wire

operation

• Small mechanical size (8 mm

diameter x 5.5 mm depth)

• Precise duty cycle signal over

operating temperature range

• Large operating air gaps

• Automatic Gain Control (AGC)

for air

gap independent switchpoints

• Automatic Offset Adjustment (AOA)

for signal processing optimization

• True zero-speed operation

• Undervoltage lockout

• Wide operating voltage range

The ATS642LSH is an optimized Hall effect sensing integrated circuit and magnet

combination that provides a user-friendly solution for true zero-speed digital

gear-tooth sensing in two-wire applications. The sensor consists of a single-shot

molded plastic package that includes a samarium cobalt magnet, a pole piece,

and a Hall effect IC that has been optimized to the magnetic circuit. This small

package, with 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 sensor and signal

processing that switches in response to differential magnetic signals created

by ferrous gear teeth. The circuitry contains a sophisticated digital circuit to

reduce magnet and system offsets, to calibrate the gain for air gap independent

switchpoints, and to achieve true zero-speed operation. Signal optimization occurs

at power-up through the combination of offset and gain adjust and is maintained

throughout the operating time with the use of a running mode calibration. The run-

ning mode calibration allows immunity to environmental effects such as microos-

cillations of the target or sudden air gap changes.

The regulated current output is configured for two wire applications and the

sensor is ideally suited for obtaining speed and duty cycle information in ABS

(antilock braking systems). The 1.5 mm Hall element spacing is optimized for fine

pitch gear-tooth-based configurations. The package is lead (Pb) free, with 100%

matte tin leadframe plating.

Two-Wire True Zero Speed Miniature Differential

Peak-Detecting Gear Tooth Sensor with Continuous Calibration

Package SH, 4-pin Module

Features and Benefits

1. VCC

2. No connection

3. Test pin (float or tie to GND)

4. GND

1 2

3 4

Use the following complete part numbers when ordering:

Part Number

Packing*

ATS642LSHTN-I1-T

6.0 Low to 14.0 High mA

Tape and reel,

13-inch reel

800 pieces/reel

ATS642LSHTN-I2-T

7.0 Low to 14.0 High mA

*Contact Allegro for additional packing options.