True Zero-Speed Low-Jitter High Accuracy
Gear Tooth Sensor IC
ATS625LSG
15
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
IC and Target Evaluation
-400
-350
-300
-250
-200
-150
-100
-50
0
50
100
150
200
250
300
0
30
60
90
120
150
180
Target Rotation (?
0.75
1.00
1.50
2.00
2.50
3.00
AG
(mm)
Magnetic Map, Reference Target 60+2 with ATS625
0
100
200
300
400
500
600
700
800
0.5
1.0
1.5
2.0
2.5
3.0
3.5
G mm
Air Gap Versus Magnetic Field, Reference Target 60+2 with ATS625
Magnetic Profile
In order to establish the proper operating specification for a par-
ticular IC and target system, a systematic evaluation of the mag-
netic circuit should be performed. The first step is the generation
of a magnetic map of the target. By using a calibrated device, a
magnetic profile of the system is made. Figure 10 is a magnetic
map of the 60+2 reference target.
A single curve can be derived from this map data, and be used to
describe the peak-to-peak magnetic field strength versus the size
of the air gap, AG. This allows determination of the minimum
amount of magnetic flux density that guarantees operation of
the IC, B
IN
, so the system designer can determine the maximum
allowable AG for the IC and target system. Referring to fig-
ure 11, a B
IN
of 60 G corresponds to a maximum AG of approxi-
mately 2.5 mm.
Figure 10. Magnetic Data for the Reference Target 60+2 with ATS625. In the top panel, the Signature Region appears in the center of the plot.
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