ATS640JSB

Data Sheet 27627.114a ATS640JSB TRUE ZERO-SPEED, SELF-CALIBRATING, DIFFERENTIAL HALL-EFFECT GEAR-TOOTH SENSOR IC FOR TWO-WIRE APPLICATIONS The ATS640JSB Hall-effect gear-tooth sensor IC is a peak detecting device 1 2 that uses internal gain control to provide extremely stable duty cycles down to 3 zero speed. Each device consists of a high-temperature plastic shell 4 that holds together a samarium-cobalt pellet, a pole piece, and a true zero- DUCTPin 1 = Supply O HPin 2 = Current Output SPin 3 = No Connection RPin 4 = Ground Dwg. AH-006-3A D P 645LPRELIMINARY INFORMATION S(subject to change without notice) UE ATAugust 28, 2002 speed BiCMOS differential Hall-effect gear-tooth sensor IC that has been optimized to the magnetic circuit. This small package can be easily assembled and used in conjunction with a wide variety of gear shapes and sizes. The technology used for this device is Hall-effect based. The chip incorporates a dual-element Hall IC that switches in response to differential magnetic signals created by a ferrous target. The sophisticated self-calibrating digital-processing circuitry normalizes the internal gain of the device to minimize the effect of air gap variations. and to reduce vibration sensitivity. The circuit eliminates magnet and system offsets such as those caused by tilt yet provides zero-speed detection capabilities without the associated running jitter inherent in classical digital solutions. This device is ideal for use in gathering speed,...