The A1688 Hall-effect based wheel speed sensor IC enables simple module assembly by utilizing a built-in capacitor and wider lead width/spacing. Targeting automotive markets, it employs a dual-element Hall-effect circuit and signal processing that switches in response to differential magnetic signals created by magnetic encoders, or, when properly back-biased with a magnet, from ferromagnetic targets. The device contains a sophisticated digital circuit that reduces magnet and system offsets, calibrates the gain for air gap independent switch points, and provides true zero-speed operation. Signal optimization occurs at power-up through the combination of offset and gain-adjust and is maintained throughout operation with the use of a running-mode calibration scheme. Running-mode calibration provides immunity from environmental effects such as micro-oscillations of the sensed target or sudden air gap changes. Pricing is $1.02 each/1,000.
Allegro MicroSystems
Worcester, MA
508-853-5000
http://www.allegromicro.com
Contact Info