AATS643LSH_06 Datasheet, PDF (5/16 Pages) Allegro MicroSystems – Self-Calibrating, Zero-Speed Differential Gear Tooth Sensor with Continuous Update

ATS643LSH
Self-Calibrating, Zero-Speed Differential
Gear Tooth Sensor with Continuous Update
REFERENCE TARGET, 60-0 (60 Tooth Target)
Characteristics
Symbol
Test Conditions
Typ.
Outside Diameter
Face Width
Circular Tooth Length
Circular Valley Length
Tooth Whole Depth
Material
D_o
Outside diameter of target
120
F
Breadth of tooth, with respect ₆
to sensor
Length of tooth, with respect
t
to sensor; measured at D_o
3
t_v
Length of valley, with respect ₃
to sensor; measured at D_o
h_t
3
Low Carbon Steel
–
Units
mm
mm
mm
mm
mm
–
Symbol Key
Reference Gear Magnetic Gradient Amplitude
with Reference to Air Gap
1800
1600
1400
1200
1000
800
600
400
200
0
0.5
1
1.5
2
AG (mm)
Branded Face
of Sensor
Reference Target
60-0
2.5
Reference Gear Magnetic Profile
Two Tooth-to-Valley Transitions
700
600
500
400
300
200
100
0
-100
-200
-300
2.00 mm AG
-400
-500
0.50 mm AG
-600
-700
0
1
2
3
4
5
6
7
8
9 10 11 12
Gear Rotation (°)
*Differential B corresponds to the calculated difference in the magnetic field as
sensed simultaneously at the two Hall elements in the device (B_DIFF = B_E1 – B_E2).
AG (mm)
0.50
0.75
1.00
1.25
1.50
1.75
2.00
Allegro MicroSystems, Inc.
5
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com