ATS632LSA

HALL-EFFECT

GEAR-TOOTH SENSOR

SUBASSEMBLY

Always order by complete part number, e.g., ATS632LSA .

ZERO-SPEED, SELF-CALIBRATING,

NON-ORIENTED, HALL-EFFECT GEAR-TOOTH SENSOR

Dwg. AH-006-2

1

2

3

4

Pin 1 = Supply

Pin 2 = Output

Pin 3 = Test Point

Pin 4 = Ground

The ATS632LSA gear-tooth sensor is an optimized Hall-effect IC/

magnet combination that provides extremely accurate tooth edge

detection when used with large-pitch targets. The sensor subassembly

consists of a high-temperature plastic shell that holds together a

compound samarium-cobalt magnet and a single-element self-calibrat-

ing Hall-effect IC that has been optimized to the magnetic circuit. This

small package, with its non-oriented operation, can be easily as-

sembled on a PC board for complete protection and used in conjunc-

tion with a number of gear configurations.

The gear sensing technology used for this sensor subassembly is

Hall-effect based. The sensor incorporates a single-element Hall IC

that switches in response to absolute magnetic signals created by a

ferrous target. The digital output is LOW over a tooth and HIGH over a

valley. The sophisticated processing circuitry contains self-calibrating

6-bit A/D circuitry that adapts the thresholds to the peak-to-peak

signals to minimize the effects of variation in application air gap on

switch-point timing accuracy. The effects of system and device offsets

are minimized by using active offset cancellation circuitry. The digital

algorithm provides zero-speed detection capabilities without the

associated running jitter inherent in classical digital solutions.

This sensor system is ideal for use in gathering speed, position

and profile information of ferrous objects. They are particularly suited

to large tooth/valley sensing applications where accurate timing

accuracy is a desired feature. For applications requiring the sensing of

fine-pitch gears, the ATS610LSA and ATS611LSB are recommended.

ABSOLUTE MAXIMUM RATINGS

Package Power Dissipation,

Operating Temperature Range,

* Operation at increased supply voltages with

external circuitry is described in Applications

Information.

ATS632LSA

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PRELIMINARY INFORMATION

(subject to change without notice)

December 2, 1998