Two-Wire True Zero Speed Miniature Differential

Peak-Detecting Gear Tooth Sensor with Continuous Calibration

ATS642LSH

8

Allegro MicroSystems, Inc.

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

-0.2

0

0.2

0.4

0.6

0.8

1.0

1.2

0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

Characteristic Allowable Air Gap Movement

60-0 (60 Tooth Target)

The colored area in the chart above shows the region of allow-

able air gap movement within which the sensor will continue

output switching. The output duty cycle is wholly dependent on

the target’s magnetic signature across the air gap range of move-

ment, and may not always be within specification throughout the

The axis parameters for the chart are defined in the draw-

ings below. As an example, assume the case where the air gap

is allowed to vary from from the nominal installed air gap

with an “x” in the chart above.

For more information on these figures and the calculations used to generate them, please refer to the Applications

Note Determining Allowable Air Gap Variation for the ATS642.

TEAG

IN

Sensor

Sensor

TEAG

OUT

(a)

Sensor

TEAG

CAL

(b)

(c)