Two-Wire True Zero Speed Miniature Differential

Peak-Detecting Gear Tooth Sensor with Continuous Calibration

ATS642LSH

5

Allegro MicroSystems, LLC

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

REFERENCE TARGET, 60-0 (60 Tooth Target)

Characteristics

Symbol

Test Conditions

Typ.

Units

Symbol Key

Outside Diameter

Outside diameter of target

120

mm

F

Air Gap

Branded Face of Sensor

t

Face Width

F

Breadth of tooth, with

respect to sensor

6mm

Angular Tooth Thickness

t

Length of tooth, with

respect to sensor

3

deg

Angular Valley Thickness

Length of valley, with

respect to sensor

3

deg

Tooth Whole Depth

3mm

–

–

l

e

e

t

S

n

o

b

r

a

C

w

o

L

l

a

ir

e

t

a

M

Reference Gear Magnetic Gradient Amplitude

With Reference to Air Gap

Air Gap (mm)

0

100

200

300

400

500

600

700

800

11.5

2

0.5

2.5

3

Reference Gear Magnetic Profile

Two Tooth-to-Valley Transitions

-500

-400

-300

-200

-100

0

100

200

300

400

500

Gear Rotation (°)

024

6

8

10

12

0.50

(mm)

Air Gap

0.50 mm AG

3.00 mm AG

0.75

1.00

1.25

1.50

1.75

2.00

2.25

2.50

2.75

3.00

Reference Target

60-0

of Sensor

Branded Face