ATS625LSG datasheet(5/21 Pages) ALLEGRO

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True Zero-Speed Low-Jitter High Accuracy

Gear Tooth Sensor

ATS625LSG

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

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

www.allegromicro.com

REFERENCE TARGET 60+2

Characteristics

Symbol

Test Conditions

Typ.

Units

Symbol Key

Outside Diameter

Outside diameter of target

120

Branded Face

of Sensor

Air Gap

Face Width

Breadth of tooth, with respect

to sensor

6mm

Circular Tooth Length

Length of tooth, with respect

to sensor; measured at Do

3mm

Signature Region Cir-

cular Tooth Length

tSIG

Length of signature tooth,

with respect to sensor; mea-

sured at Do

Circular Valley Length

Length of valley, with respect

to sensor; measured at Do

3mm

Tooth Whole Depth

3mm

Material

Low Carbon Steel

–

Reference Target

Signature Region

60+2

of Sensor

Branded Face

Pin 4

Pin 1

Reference Target (Gear) Information

For the generation of adequate magnetic field levels, the fol-

lowing recommendations should be followed in the design and

specification of targets:

• 2 mm < tooth width, t < 4 mm

• Valley width, tv > 2 mm

• Valley depth, ht > 2 mm

• Tooth thickness, F ≥ 3 mm

• Target material must be low carbon steel

Although these parameters apply to targets of traditional

geometry (radially oriented teeth with radial sensing, shown in

figure 1), they also can be applied in applications using stamped

targets (an aperture or rim gap punched out of the target mate-

rial) and axial sensing. For stamped geometries with axial sens-

ing, the valley depth, ht, is intrinsically infinite, so the criteria for

tooth width, t, valley width, tv, tooth material thickness, F, and

material specification need only be considered for reference. For

example, F can now be < 3 mm.

Figure 1. Configuration with Radial-Tooth Reference Target

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