Two-Wire, Zero Speed

Differential Gear Tooth Sensor IC

ATS685LSH

5

Allegro MicroSystems, Inc.

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

Reference Gear Magnetic Profile

Reference Target 60-0, Hall element spacing 2.20 mm

Gear Rotation (°)

Air Gap (mm)

0

2

4

6

8

10

12

14

16

18

20

600

400

200

0

200

400

600

0.50 mm AG

3.00 mm AG

0.50

0.75

1.00

1.25

1.50

1.75

2.00

2.25

2.50

2.75

3.00

12

0

3

1200

1000

800

600

400

200

0

Reference Gear Magnetic Gradient Amplitude versus Air Gap

Reference Target 60-0, Hall element spacing 2.20 mm

Air Gap (mm)

Reference Target 60-0 (60 Tooth Target)

Characteristics

Symbol

Test Conditions

Typ.

Units

Symbol Key

Outside Diameter

Outside diameter of target

120

mm

Ø

F

Branded Face

of Package

Air Gap

Face Width

F

Breadth of tooth, with respect

to branded face

6mm

Angular Tooth Thickness

t

Length of tooth, with respect

to branded face

3

deg.

Angular Valley Thickness

Length of valley, with respect

to branded face

3

deg.

Tooth Whole Depth

3mm

Material

Low Carbon Steel

–

–

Reference Target

60-0

of Package

Branded Face