True Zero-Speed Low-Jitter High Accuracy
Gear Tooth Sensor IC
ATS625LSG
5
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
REFERENCE TARGET 60+2
Characteristics   Symbol
Test Conditions
Typ.  Unit
Symbol Key
Outside Diameter
D
o
Outside diameter of target
120   mm
tV
?SPAN class="pst ATS625LSGTN-T_2595603_6">D
O
h
t
F
Branded Face
of Package
Air Gap
Face Width
F
Breadth of tooth, with respect to
branded face
6   mm
Circular Tooth Length
t
Length of tooth, with respect to
branded face; measured at D
o
3   mm
Signature Region Circu-
lar Tooth Length
t
SIG
Length of signature tooth, with
respect to branded face; mea-
sured at D
o
15   mm
Circular Valley Length
t
v
Length of valley, with respect to
branded face; measured at D
o
3   mm
Tooth Whole Depth
h
t
3   mm
Material
Low Carbon Steel
    
Reference Target
Signature Region
60+2
of Package
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, t
v
 > 2 mm
" Valley depth, h
t
 > 2 mm
" Tooth thickness, F e 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, h
t
, is intrinsically infinite, so the criteria for
tooth width, t, valley width, t
v
, 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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