5

ATS643-DS, Rev. 1

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

115 Northeast Cutoff, Box 15036

www.allegromicro.com

Allegro MicroSystems, Inc.

Self-Calibrating, Zero-Speed Differential GTS with Continuous Update

ATS643LSH

Reference Gear Magnetic Profile

Two Tooth-to-Valley Transitions

-700

-600

-500

-400

-300

-200

-100

0

100

200

300

400

500

600

700

0123456789

10

11

12

Gear Rotation (°)

0.50 mm AG

2.00 mm AG

0.50

0.75

1.00

1.25

1.50

1.75

2.00

AG (mm)

Reference Gear Magnetic Gradient Amplitude

with Reference to Air Gap

0

200

400

600

800

1000

1200

1400

1600

1800

AG (mm)

0.5

1

1.5

2

2.5

REFERENCE TARGET, 60-0 (60 Tooth Target)

Characteristics

Symbol

Test Conditions

Typ.

Units

Symbol Key

Outside Diameter

Outside diameter of target

120

mm

Face Width

F

Breadth of tooth, with respect

to sensor

6mm

Circular Tooth Length

t

Length of tooth, with respect

3mm

Circular Valley Length

Length of valley, with respect

3mm

Tooth Whole Depth

3mm

Material

Low Carbon Steel

–

–

*Differential B corresponds to the calculated difference in the magnetic field as

Reference Target

60-0

of Sensor

Branded Face