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Allegro MicroSystems, Inc. Introduces Self-Calibrating
TPOS Gear-Tooth Sensor
ATS673 Optimized for Automotive Cam Sensing Applications 
Worcester, MA, March 8, 2005 — Allegro MicroSystems, Inc. announces an innovative addition to its cutting-edge speed-sensing solutions, the ATS673/4LSE. These sensor ICs are designed to operate with a True Power-On State (TPOS) recognition and include a self-calibrating feature in running mode that improves accuracy performance over a wide temperature and air-gap range. The unique packaging concept integrates the magnet and a monolithic silicon IC, which are carefully designed to provide optimal performance. Allegro's advanced quick calibration routine and signal processing make speed sensing easier and more reliable than ever before.
Allegro's ATS673/4LSE sensor ICs incorporate a single-element Hall-effect sensor IC and signal-processing circuitry that switches in response to changing magnetic signals created by rotating ferrous targets. The TPOS feature of the sensor IC provides an accurate reading of the sensor IC's position in relation to the target upon power-up of the sensor IC. Digital tracking of the analog signal is used to set the switching threshold of the device. 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. Robust input and output EMC structures provide excellent immunity to transients and ESD pulses seen in typical automotive applications.
Allegro's newest sensor IC is targeted to meet the needs of industrial and automotive markets with end applications that include camshaft speed sensing, zero-speed gear-tooth sensing, and proximity sensing.
The ATS673/4LSE is supplied in an "SE" package, which 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