ATS645 Allegro MicroSystems, Inc., ATS645 Datasheet - Page 5

• Manufacturer Part Number: ATS645
• Description: Ats645lsh True Zero Speed Miniature Gear-tooth Sensors
• Manufacturer: Allegro MicroSystems, Inc.

ATS645LSH
REFERENCE TARGET, 60-0 (60 Tooth Target)
Outside Diameter
Face Width
Circular Tooth Length
Circular Valley Length
Tooth Whole Depth
Material
800
700
600
500
400
300
200
100
Characteristics
0
0.5
Reference Gear Magnetic Gradient Amplitude
1
With Reference to Air Gap
Symbol
*Differential B corresponds to the calculated difference in the magnetic fi eld as
sensed simultaneously at the two Hall elements in the device (B
D
h
1.5
F
t
t
v
o
t
Air Gap (mm)
-100
-200
-300
-400
-500
500
400
300
200
100
0
Outside diameter of target
Breadth of tooth, with respect
to sensor
Length of tooth, with respect
to sensor; measured at D
Length of valley, with respect
to sensor; measured at D
Low Carbon Steel
0
True Zero Speed Miniature Differential Peak-
2
Test Conditions
2
Reference Gear Magnetic Profile
Two Tooth-to-Valley Transitions
2.5
4
Gear Rotation (°)
o
o
6
3
Typ.
120
Branded Face
6
3
3
3
–
of Sensor
8
Detecting Gear Tooth Sensor
3.00 mm AG
0.50 mm AG
Reference Target
60-0
Units
mm
mm
mm
mm
mm
–
10
DIFF
= B
12
E1
– B
115 Northeast Cutoff, Box 15036
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com
E2
).
Air Gap
Symbol Key
(mm)
0.50
0.75
1.00
1.25
1.50
1.75
2.00
2.25
2.50
2.75
3.00
5