Allegro’s A1698 is a Hall effect based integrated circuit (IC) that provides a user-friendly solution for two-wire speed sensing of ring magnets or ferrous targets (when back-biased by the user) down to zero-speed in applications where speed and direction is required. The A1698 is offered in the UB package, which integrates the IC and a high-temperature ceramic capacitor in a single, over-molded SIP package.

The integrated capacitor provides enhanced EMC performance. The integrated circuit incorporates Hall effect circuits 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 circuitry 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.

The regulated current output is configured for two-wire interface circuitry and is ideally suited for obtaining speed and direction information in wheel-speed applications. The 2-pin SIP package is lead (Pb)-free, with tin lead frame plating.