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Allegro Microsystems, Inc. Introduces a Two-Wire
Sensor Optimized to Address the Difficulties of Transmission Speed
Sensing
ATS643 is an innovative member of Allegro's cutting-edge
speed-sensing solutions 
Worcester, MA — March 30, 2004 — Allegro MicroSystems, Inc. announces the ATS643LSH, a two-wire sensor IC optimized to address the difficulties of transmission speed sensing, including withstanding dynamic changes in air gap while maintaining good duty cycle. The unique packaging concept integrates the magnet and a monolithic silicon IC, which are carefully designed to provide peak performance. Allegro's advanced quick calibration routine and signal processing make speed sensing easier and more reliable then ever before.
The ATS643LSH sensor IC incorporates a dual-element Hall-effect sensor IC and signal-processing circuitry that switches in response to differential magnetic signals created by rotating ferrous targets. The device contains a sophisticated compensation circuit to eliminate magnet and system offsets immediately at startup. Digital tracking of the analog signal is used to achieve true zero-speed operation, while also setting the optimal device switchpoints. The resulting switchpoints are air-gap independent, greatly improving output accuracy and duty cycle. The device also uses an updated algorithm to fine-tune switchpoints in running mode, maintaining the device specifications even through large changes in air gap.
Allegro's newest sensor IC is targeted to meet the needs of industrial and automotive markets with end applications that include transmission and ABS speed sensing.
Allegro's "SH" package uses a single-step overmold process and consists of a samarium-cobalt magnet and the Hall-effect IC. This package provides an optimized magnetic solution for digital gear-tooth sensing applications and eliminates the presence of air voids that can be problematic during other multi-step package configurations. The close proximity of the magnet to the IC provides excellent heat sinking, permitting higher operating temperatures in a smaller user-friendly package.
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