True Zero Speed Miniature Differential Peak-
Detecting Gear Tooth Sensor IC
ATS645LSH
5
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
REFERENCE TARGET, 60-0 (60 Tooth Target)
Characteristics    Symbol
Test Conditions
Typ.  Units
Symbol Key
Outside Diameter
D
o
Outside diameter of target
120   mm
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
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 Gear Magnetic Gradient Amplitude
With Reference to Air Gap
Air Gap (mm)
0
100
200
300
400
500
600
700
800
1
1.5
2
0.5
2.5
3
Reference Gear Magnetic Profile
Two Tooth-to-Valley Transitions
-500
-400
-300
-200
-100
0
100
200
300
400
500
Gear Rotation (?
0
2
4
6
8
10
12
0.50
(mm)
Air Gap
0.50 mm AG
3.00 mm AG
0.75
1.00
1.25
1.50
1.75
2.00
2.25
2.50
2.75
3.00
of Package
Reference Target
60-0
of Package
Branded Face
*Differential B corresponds to the calculated difference in the magnetic  eld as
sensed simultaneously at the two Hall elements in the device (B
DIFF
 = B
E1
  B
E2
).
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