ATS632LSC

HALL-EFFECT

GEAR-TOOTH SENSOR

SUBASSEMBLY

Always order by complete part number, e.g., ATS632LSC .

ZERO-SPEED, SELF-CALIBRATING,

NON-ORIENTED, HALL-EFFECT GEAR-TOOTH SENSOR

The ATS632LSC gear-tooth sensor is an optimized Hall-effect IC/

magnet combination that provides tooth/valley recognition and ex-

tremely 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,

a single-element self-calibrating Hall-effect IC that has been optimized

to the magnetic circuit, and a voltage regulator. This small package,

with its non-oriented operation, can be easily assembled and used in

conjunction 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.

The sensor system is ideal for use in gathering speed, position and

profile information of ferrous objects. The device is 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 ATS611LSB is recommended.

ABSOLUTE MAXIMUM RATINGS

Reverse Supply Voltage,

Package Power Dissipation,

Operating Temperature Range,

ATS632LSC

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Dwg. AH-008

1

2

3

1 = Supply

2 = Output

3 = Ground

PRELIMINARY INFORMATION

(subject to change without notice)

April 8, 1998