Allegro MicroSystems has introduced a Hall-effect sensing integrated circuit and magnet combination that provides a solution for true zero-speed, digital gear-tooth sensing in two-wire applications. This small package, with a two-wire lead frame, can be easily assembled and used in conjunction with a wide variety of gear shapes and sizes. The ATS682LSH is a magnetic solution for ferrous target applications.
The IC incorporates a dual-element, Hall-effect sensor and signal processing that switches in response to differential magnetic signals created by a ferrous target. The device contains sophisticated circuitry that reduces magnet and system offsets, calibrates the gain for air gap independent switch points and provides true zero-speed operation.
Signal optimisation 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 allows immunity to environmental effects such as micro-oscillations of the sensed target at startup or sudden air gap changes. The regulated current output is configured for two-wire interface circuitry and is ideally suited for obtaining speed information in wheel speed applications. The Hall element spacing is optimised for high-resolution, small-diameter targets.
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