True zero-speed, Hall-effect
adaptive gear-tooth sensor.
The new ATS660LSB from Allegro MicroSystems is a
digital differential gear-tooth sensor module designed
to provide high levels of repeatability and timing accuracy
in the most demanding automotive transmission applications.
The ATS660LSB incorporates self-calibration circuitry, patented
under US Patent 5,917,320, that nulls out the effects of installation
air gap, ambient temperature, and magnet offsets to provide
superior timing accuracy over large operating air gaps for target
pitches varying from below 0.5 to over 1.2 teeth per diametric
This self-calibration under power-up conditions keeps the
performance optimised over the life of the sensor.
The integrated circuit within the sensor module incorporates a
dual-element Hall-effect sensor and signal-processing circuitry
that switches in response to differential magnetic signals created
by the ferrous gear teeth. An open-collector output allows direct
digital interfacing with no further signal processing required.
The circuitry contains a sophisticated digital circuit which
eliminates the effects of magnet and system offsets, allowing
true zero-speed operation.
Analogue/digital and digital/analogue convertors are used to
adjust the device gain at power on and to allow air-gap
independent switching, which greatly reduces vibration sensitivity
of the device.
This device is supplied in a package measuring 9 mm in
diameter × 7 mm in length.
Allegro MicroSystems Europe
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