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High-Performance Power ICs and Hall-Effect Sensors
Allegro MicroSystems, Inc. Introduces Analog Self-Calibrating
Speed Sensor
Integrated tracking capacitor allows for ease of use 
Worcester, MA, June 8, 2005 — Allegro MicroSystems, Inc. announces an innovative addition to its cutting-edge speed-sensing solutions, the ATS616LSG. This sensor is a proven solution for non-TPOS camshaft applications, providing improved EMC and ESD, and eliminating the need for an external switching capacitor. The ATS616LSG also has the advantage of the smaller integrated GTS package, while maintaining the key specifications of the ATS612LSB, like airgap range and high timing accuracy.
Allegro's newest addition is a peak-detecting device that uses automatic gain control and an integrated capacitor to provide extremely accurate gear-edge detection down to low operating speeds. Each sensor subassembly consists of a high-temperature plastic shell that holds together a samarium-cobalt magnet, a pole piece, and a differential open-collector Hall IC that has been optimized to the magnetic circuit. The small package can be easily assembled and used in conjunction with a wide variety of gear shapes and sizes.
The gear-sensing technology used for this sensor subassembly is Hall-effect-based. The sensor incorporates a dual-element Hall IC that switches in response to differential magnetic signals created by ferrous targets. The sophisticated processing circuitry contains an A/D converter that self-calibrates (normalizes) the internal gain of the device to minimize the effect of airgap variations. The patented peak-detecting filter circuit eliminates magnet and system offsets, and has the ability to discriminate relatively fast changes such as those caused by tilt, gear wobble, and eccentricities, yet provides stable operation to extremely low RPM.
This sensor system is ideal for use in gathering speed, position and timing information using gear-tooth-based configurations. The ATS616LSG is particularly suited to those applications that require extremely accurate edge detection such as in automotive camshaft applications.
Allegro MicroSystems, Inc. is a supplier of advanced mixed-signal power semiconductors and Hall-effect sensors targeted toward the automotive, communications, computer/office automation, consumer and industrial markets. It maintains a leadership position in the integrated magnetic sensor and integrated motor driver product segments. With more than 2,000 employees, Allegro is headquartered in Worcester, MA. Further information about Allegro, including free samples of our products, can be found at www.allegromicro.com.
Editorial Contact:
Stephanie Fennelly
Director – Marketing Communications
Tel: (508) 854-5363
sfennelly@allegromicro.com