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Allegro MicroSystems, Inc. Introduces New Chopper-Stabilized
Latch
A1242 ideal for motor-speed and direction-sensing applications 
Worcester, MA, September 13, 2005 — Allegro MicroSystems, Inc. announces the A1242, a new chopper-stabilized latch ideally suited for use in motor-speed and direction-sensing applications, as well as in other applications where the sensor is located far from the ECU. This sensor requires one less wire in the wiring harness than the comparable three-wire Hall-effect latch. Additionally, the two-wire feature of this sensor provides inherent short/open detection.
The A1242 is a two-wire, current-output, Hall-effect latch that is ideally suited for use in automotive, industrial and consumer applications. The sensor employs a patented high-frequency chopper-stabilization technique on Allegro's new DABIC5 (Digital Analog BiCMOS) process to achieve magnetic stability over temperature. The A1242 operates accurately and consistently in harsh environments, such as those commonly found in automotive applications. Additionally, the A1242 is designed for flexibility by offering two different output current level options.
This device provides on-chip transient protection, while a zener clamp on the power supply protects against over-voltage conditions on the supply line. The output of this family will switch HIGH in the presence of a sufficiently large south-pole magnetic field and LOW in the presence of a sufficiently large north-pole magnetic field.
About Allegro
Allegro MicroSystems, Inc. is a leader in developing, manufacturing and marketing high-performance power and Hall-effect sensor integrated circuits. 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.
Editorial Contact:
Stephanie Fennelly
Director - Marketing Communications
Tel: (508) 854-5363
sfennelly@allegromicro.com