Components for speed sensing applications continue to shrink in size to meet space constraints and weight reduction requirements.As the gear size becomes smaller, this can compromise the capabilities of the gear speed sensor IC.The ATS645 Hall element, with a Hall element of only 1.5 mm pitch, is the only unit capable of accommodating very fine pitch gears.In addition, the signal peak detection algorithm ATS645 supports relatively large air gap consistent switching with small peak amplitude.These characteristics makeats645detectFine spacingobjectivesAs foundABSvelocityThe ideal solution（Anti-lock braking）system。
The ATS645 combines Hall-effect sensor ICs and magnets to provide a true zero-speed digital gear with a manufacturing-friendly solution for a variety of applications.The device consists of a single-rod molded plastic package consisting of samarium-cobalt magnets, pole pieces, and an optimized magnetic circuit for Hall-effect integrated circuits.This small packageCan be easily assembledand useVarious with a pair of gearsShape and sizecombine。
The integrated circuit consists of a two-element Hall-effect sensor integrated circuit as well as signal processing, switching output state response to changes in magnetic gradients generated by iron teeth.The circuit contains a complex digital circuit that eliminates magnets and system offsets and enables true zero-speed operation (U.S. Patent 5917320).modulusandDigital-to-analog convertersForpoweradjustThe gain of the deviceandallowSwitch to standaloneAir gapwidth。
Adjustable current outputconfigured asTwo linesapplication,needOperate oneLess linescompareSwitch withMore traditionalOpen-collector output。The package is lead-free（Pb）Free version，100% matte tin plating。
Fully optimizedDifferential numbersGear teethsensorIC
Single-chip sensingof the chipHigh reliability
2 linesInternal of the operationCurrent regulator
smallof mechanical dimensions（Diameter 8 mm× 5.5 mmdepth)
Air gap independent switching point
The digital output occupies the tooth profile
PreciseDuty cycle signalIn the operating temperature range
Large air gap
Automatic gain control（AGC）
automaticOffset adjustment（AOA）
True zero-speed operation
Undervoltage lockout
Wide operating voltage range
The defined power-on state