Product News: Electrical Equipment & Systems

Unipolar Hall-Effect Switch features built-in diagnostics.

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Press Release Summary:

January 14, 2014 - With integrated coil surrounding Hall sensing element, A1160 functions as typical unipolar switch during normal operation: output turns on in presence of south-pole magnetic field and off when field is removed. Diagnostics mode lets current pass through integrated coils, generating ~20 G of magnetic field. Proximity of coils to Hall sensing element lets element sense field generated by coil while ignoring external fields. This feature ensures proper sensing of magnetic signal.

Allegro Microsystems, Inc.

115 N.E. Cutoff, P.O. Box 15036, Worcester, MA, 01615, USA

Original Press Release

Allegro MicroSystems, LLC Announces a New Unipolar Switch with Built-In Diagnostics

Press release date: January 1, 2014

Unique Solution to Self-Diagnose Improper Device Operation

Worcester, MA – Allegro MicroSystems, LLC announces a revolutionary unipolar, Hall-effect switch that is unlike any other competitive device on the market today. Allegro’s A1160 solution includes an integrated coil surrounding the Hall sensing element. During normal operation, the device functions as a typical unipolar switch (output turns on in the presence of south-pole magnetic field and turns off when the field is removed), but, when the diagnostics pin is pulled high, it enters diagnostics mode. This patented feature allows current to pass through the integrated coils, generating ~20 G of magnetic field.

The proximity of the coils to the Hall sensing element allows the element to sense the field generated by the coil, while ignoring external fields. In diagnostics mode the device will output a PWM signal of 50% duty cycle when the device is properly sensing the internally generated magnetic field.

The patented feature, found within the A1160 device, exercises the entire electrical signal path of the integrated circuit. It ensures proper sensing of the magnetic signal to provide accurate device functionality. The use of the A1160 eliminates the need for redundant sensors in safety critical applications and satisfies most Automotive Safety Integrity Level (“ASIL”) requirements.

Allegro’s A1160LLH-T is targeted at both the automotive and industrial markets. It has an operating temperature range of -40°C to +150°C and is supplied in a small, surface mount, 5-lead (SOT-23W) package.  It is priced at $0.41 in quantities of 1,000.

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.

Contact information: Stephanie Fennelly, Allegro MicroSystems, P.O. BOX 15036, Worcester, MA 16150036

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