Allegro MicroSystems Introduces a Two-Wire, True Zero-Speed, Differential Peak-Detecting Sensor

Worcester, MA ¨C May 19, 2009 ¡ª Allegro MicroSystems, Inc. introduces a Hall-effect sensing integrated circuit and magnet combination that provides a user-friendly solution for true zero-speed, digital gear-tooth sensing in two-wire applications. This small package, with an optimized two-wire lead frame, can be easily assembled and used in conjunction with a wide variety of gear shapes and sizes. Allegro¡¯s ATS682LSH is a magnetic solution for ferrous target applications.

The integrated circuit incorporates a dual-element, Hall-eff

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ect 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 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 allows immunity to environmental effects such as micro-oscillations of the sensed target at start-up 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 optimized for high resolution, small diameter targets.

Allegro¡¯s ATS682LSH is offered in the ¡°SH¡± magnetically integrated package. The SH is a single step over-molded package, which consists of a samarium cobalt magnet and a Hall-Effect IC. This unique package offering simplifies the design-in process. It is lead (Pb) free, with 100% matte tin lead frame plating.

About Allegro

Allegro MicroSystems, Inc. is a leader in developing, manufacturing and marketing high-performance power integrated circuits and integrated Hall-effect magnetic sensors. Allegro¡¯s innovative solutions serve high-growth applications within the automotive, communications, computer/office automation, consumer and industrial markets. Allegro is headquartered in Worcester, Massachusetts (USA) with design and applications centers located in North and South America, Asia, and Europe. Further information about Allegro can be found at www.allegromicro.com.

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