Allegro MicroSystems, LLC Introduces New Hall-Effect Speed/Direction Sensor IC With Hysteresis Detection

Improved Overall Accuracy when Sensing High Resolution, Multi-Pole Ring Magnets

February 10, 2015

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Worcester, MA – Allegro MicroSystems, LLC introduces a new Hall-effect speed and direction sensor IC with hysteresis detection. The A1232 is a highly sensitive, temperature stable, magnetic sensing device ideal for use in ring magnet based speed and direction systems in harsh automotive and industrial environments. It is the first device of its kind with the ability to detect when it powers up in the magnetic hysteresis band. This feature reduces angle accuracy error, which can occur when edges are missed at start-up. This new magnetic sensor IC is targeted at the automotive motor market. Key applications include: window lifts, sunroofs, sliding doors, and tail/trunk lift gates. This new device is also suitable for applications such as garage door openers and window blinds.

Allegro’s A1232 includes dual Hall elements spaced 1.63 mm apart that are photolithographically aligned within 1 µm. The precise spacing of the sensing elements eliminates a major manufacturing hurdle encountered when using fine pitch ring magnets. The signals from the dual Hall elements are encoded into logic outputs representing the speed and direction of the target. Factory trimming and Allegro’s proprietary Chopper Stabilization / Dynamic Offset Cancellation techniques provide precise, symmetrical magnetic switch-points over a wide range of operating conditions.

A built-in voltage regulator, short-circuit protected outputs, internal Zener clamps, reverse battery protection, and a -40°C to +150°C operating range give the A1232 the ruggedness demanded by automotive applications.

The A1232LLETR-T is available in an 8-pin TSSOP (suffix LE) surface mount package.



Allegro MicroSystems, LLC is a leader in developing, manufacturing and marketing high-performance semiconductors. Allegro's innovative solutions serve high-growth applications within 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 centers located worldwide. Further information about Allegro can be found at www.allegromicro.com.


Editorial Contact:

Stephanie Fennelly
Director - Marketing Communications
Tel: (508) 854-5363
sfennelly@allegromicro.com
.

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