The ATS616LSG from Allegro MicroSystems Europe is an analog self-calibrating speed sensor designed for non-TPOS (true power on state) automotive camshaft applications.
Allegro's newest addition is a peak-detecting device that uses automatic gain control and an integrated capacitor to provide extremely accurate gear-edge detection down to low operating speeds. Each sensor subassembly consists of a high-temperature plastic shell that holds together a samarium-cobalt magnet, a pole piece, and a differential open-collector Hall IC that has been optimised to the magnetic circuit.
The sensor incorporates a dual-element Hall IC that switches in response to differential magnetic signals created by ferrous targets. The sophisticated processing circuitry self-calibrates the internal gain of the device to minimise the effect of airgap variations. The peak-detecting filter circuit eliminates magnet and system offsets, and has the ability to discriminate relatively fast changes such as those caused by tilt, gear wobble, and eccentricities, yet provides stable operation to extremely low RPM.
This sensor also features improved immunity to EMI/ESD effects and does not require an external switching capacitor.
For more information contact Simon Churches, Arrow Altech Distribution, +27 (0)11 923 9600, [email protected]
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