ATS128 datasheet(11/25 Pages) ALLEGRO

11 / 25 page

Highly Programmable, Back-Biased,

Hall-Effect Switch with TPOS Functionality

ATS128LSE

Allegro MicroSystems, LLC

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

Target Flux Density versus Target Rotation

Allegro Reference Target 8X

200

400

600

800

1000

1200

1400

120 150 180 210 240 270 300 330 360

Rotation (º)

*B measured relative to the baseline magnetic field; field polarity referenced to the branded face.

0.25

0.50

0.75

1.00

1.25

1.50

1.75

2.00

2.25

2.50

2.75

3.00

3.25

3.50

3.75

4.00

4.25

4.50

4.75

5.00

5.25

5.50

5.75

6.00

Air Gap

(mm)

REFERENCE TARGET 8X

Characteristic

Symbol

Test Conditions

Typ.

Units

Symbol Key

Outside Diameter

Outside diameter of target

120

DO ht

Branded Face

of Package

Air Gap

Face Width

Breadth of tooth, with respect to

branded face

6mm

Circular Tooth Length

Length of tooth, with respect to

branded face; measured at Do

23.6

Circular Valley Length

Length of valley, with respect to

branded face; measured at Do

23.6

Tooth Whole Depth

5mm

Material

CRS 1018

–

Reference Target 8X

of Package

Branded Face

Target / Gear Parameters for Correct Operation

For correct operation, TPOS or continuous, the target must

generate a minimum difference between the applied flux den-

sity over a tooth and the applied flux density over a valley, at

the maximum installation air gap.

The following recommendations should be followed in the

design and specification of targets:

• Face Width, F ≥ 5 mm

• Circular Tooth Length, t ≥ 5 mm

• Circular Valley Length, tv > 13 mm

• Whole Tooth Depth, ht > 5 mm

1400

1200

1000

800

600

400

200

Reference Gear Magnetic Gradient Amplitude versus Air Gap

Air Gap (mm)

Opposite tooth

Opposite valley

0123456

Reference Target Characteristics

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