Package for wheel sensors reduces complexity

Allegro MicroSystems Europe has developed a new package for the two-wire, zero speed, differential wheel speed sensor IC.

The package includes an optimised Hall-effect IC, rare-earth pellet, and high-temperature ceramic capacitor in a single over-moulded package. The levels of integration are integrated solution reduces the need for external EMC protection and integration of a magnetic circuit, reducing manufacturing complexity.

Allegro’s ATS688LSN is for true zero-speed digital gear tooth sensing in two-wire applications, such as automotive or two-wheeler braking systems.

The single IC and magnet combination incorporates a dual element Hall-effect sensor IC and signal processing circuitry that switches in response to differential magnetic signals created by a rotating ferromagnetic target. The device contains a sophisticated compensating circuit to eliminate magnetic and system offsets. Digital tracking of the analogue signal is used to achieve true zero-speed operation.

Advanced calibration algorithms are used to adjust the device gain and offset at power-up, resulting in air gap independent switch points, which greatly improves output accuracy and mitigates the effect of system anomalies such as target vibration and sudden changes in air gap. The regulated current output is configured for two-wire operation.

The ATS688LSN is provided in a lead (Pb) –free, three-pin back-biased SIP (suffix SN) with tin leadframe plating. 

Allegro MicroSystems develops, manufactures and markets semiconductors for the automotive market, with additional focus on office automation, industrial, and consumer/communications solutions. Allegro is headquartered in Worcester, Massachusetts, USA with design, applications, and sales support centres located worldwide.

Allegro MicroSystems Europe is headquartered in Chertsey, United Kingdom. It is the European sales and marketing operation, and operates a network of representatives and distributors throughout Europe. Allegro has a technical and marketing centre in Heidelberg in Germany. Allegro also has an engineering design centre in Edinburgh in Scotland and a technical and marketing centre in Annecy in France.

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