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Hall-effect sensor IC targets motorcycle tachometer apps

04 Apr 2014  | Graham Prophet

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Allegro MicroSystems Europe developed A1468, a true zero-speed differential peak-detecting Hall-effect sensor IC optimised for use in automotive speed, timing and duty-cycle sensing, particularly in motorcycle tachometer applications.

The new device is suited to digital ring-magnet sensing or, when coupled with a magnet, ferromagnetic target sensing in three-wire applications. The small device package can be readily incorporated into designs using a wide variety of target shapes and sizes.

The A1468 incorporates dual Hall-effect sensing elements with 2.2mm spacing and signal processing circuitry that switches in response to differential magnetic signals created by ring magnet poles. The device contains a digital circuit, which reduces system offsets, calibrates the gain for airgap-independent switch points and achieves true zero-speed operation through peak detecting algorithms.

Signal optimisation occurs at power-on through the combination of offset and gain adjust, and is maintained during operation by continuous running-mode calibration, which provides immunity to environmental effects such as micro-oscillations of the target or sudden airgap changes.

The Allegro A1468LK-T is available in a 4pin through-hole SIP package (suffix K).

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