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Self-Calibrating TPOS Gear Tooth Sensor ICs
Optimized for Automotive Cam Sensing Applications
ATS673 and
ATS674
14
Allegro MicroSystems, LLC
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
Device and Target Evaluation
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Target Rotation (?
Magnetic Map, Reference Target 8X with SE Package
AG (mm)
Air Gap Versus Magnetic Field, Reference Target 8X with SE Package
Magnetic Profile
In order to establish the proper operating specification for a
particular ATS device and target system, a systematic evaluation
of the magnetic 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 8X reference target.
A pair of curves can be derived from this map data, and be used
to describe the tooth and valley magnetic field strength, B, versus
the size of the air gap, AG. This allows determination of the mini-
mum amount of magnetic flux density that guarantees operation
of the IC, so the system designer can determine the maximum
allowable AG for the device and target system. One can also
determine the TPOS air gap capabilities of the IC by comparing
the minimum tooth signal to the maximum valley signal.
Figure 10. Magnetic Data for the 8X Reference Target and SE package.
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