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Allegro MicroSystems, Inc. Announces Its Next Generation
Gear-Tooth Speed Sensor
ATS665, a Fully Integrated IC with Magnet 
Worcester, MA, May 21, 2002 — Allegro MicroSystems, Inc. announces the release of its next generation true zero speed, high accuracy, gear-tooth speed sensor IC. This new sensor IC is an optimized Hall IC and magnet configured in a single over-molded package that provides a user-friendly solution. The differential Hall element configuration is superior to a classical single element gear-tooth sensor IC in most applications because it eliminates the variation in the back-biased field. The digital processing of the analog signal makes zero-speed possible and improves performance and reliability of the device.
The ATS665 device is offered in the "SG", a single step over-molded package, which consists of a samarium cobalt magnet and a Hall-Effect IC. The "SG" package provides an optimized magnetic solution for digital gear-tooth sensing applications and eliminates the presence of air voids that can be problematic during potting or over-molding. The close proximity of the magnet to the IC provides excellent heat sinking, permitting higher operating temperatures in a smaller user-friendly package.
The use of this sensor IC is simple. When power is applied to the component, and after a short calibration cycle, the sensor IC is capable of providing digital information that is representative of the profile of a rotating gear. No additional optimization is needed and minimal processing circuitry is required.
The most significant advantage of the ATS665 is its insensitivity to air-gap variation. The algorithm of this device tracks the peaks of the signal and sets the switching thresholds, which are established as a percentage of peaks, maintaining switch points around the zero crossing. The higher resolution DAC steps minimize the impact of signal variation on switching accuracy.
Allegro's new gear-tooth sensor IC is targeted to meet the needs of the industrial and automotive markets with end applications to include: industrial machinery, industrial speed sensing applications, treadmills, transmissions, power boats, golf carts, scooters and alternators/generators.
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
Technical Contact:
Dan Dwyer
Systems Engineer
Tel: (603) 228-5533
ddwyer@allegromicro.com