ATS612LSG datasheet(8/15 Pages) ALLEGRO

8 / 15 page

ATS612LSG

DYNAMIC, SELF-CALIBRATING, PEAK-DETECTING,

DIFFERENTIAL HALL-EFFECT GEAR TOOTH SENSOR

Page 8 of 15

115 Northeast Cutoff, Box 15036

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

•

Dual edge detection.

Because this device switches

from the positive and negative peaks of the signal,

dual edge detection is guaranteed.

•

Tilted or off-center installation.

Traditional

differential sensors will switch incorrectly due to

baseline changes versus air gap caused by tilted or

off-center installation. The peak detector circuitry

references the switch point from the peak and is

immune to this failure mode. There may be a timing

accuracy shift caused by this condition.

•

Large operating air gaps.

Large operating air gaps

are achievable with this device due to the sensitive

switch points after start up. (dependent on target

dimensions, material, and speed).

•

Immunity to magnetic overshoot.

The air gap-

independent hysteresis minimizes the impact of

overshoot on the switching of device output.

•

Response to surface defects in the target.

The

gain-adjust circuitry reduces the effect of minor gear

anomalies that would normally cause false

switching.

•

Immunity to vibration and backlash.

The gain-

adjust circuitry keeps the hysteresis of the device

roughly proportional to the peak-to-peak signal. This

allows the device to have good immunity to vibration

even when operating at close air gaps.

•

Immunity to gear run out.

The differential sensor

configuration eliminates the baseline variations

caused by gear run out.

Differential vs. Single-Element Sensing.

The

differential Hall-effect configuration is superior in most

applications to the classical single-element gear-tooth

sensor. As shown in the flux maps on th

is page, the

single-element configuration commonly used (Hall-effect

sensor mounted on the face of a simple permanent

magnet) requires the detection of a small signal (often

<100 G) that is superimposed on a large back-biased

field, often 1500 G to 3500 G. For most gear/target

configurations, the back-biased field values change due

to concentration effects, resulting in a varying baseline

with air gap, with valley widths, with eccentricities, and

with vibration. The differential configuration cancels the

effects of the back-biased field and avoids many of the

issues presented by the single Hall element.

NOTE: 10 G = 1 mT, exactly.

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