ATS535JSB

The ATS535JSB and ATS535SSB programmable, true power-on (TPOS), proximity sensors are optimized Hall-effect IC/magnet combinations that provide power-on tooth/valley recognition in large geartooth sensing applications and proximity detection in other applications. Each sensor subassembly consists of a high-temperature plastic shell that holds together a samarium-cobalt magnet, a pole piece, and a single element, chopper-stabilized Hall-effect IC that can be programmed to match the magnetic circuit, optimizing sensor airgap and timing accuracy performance after final packaging. The small package can be easily assembled and used in conjunction with a wide variety of gear/ target shapes and sizes. The two devices differ only in operating temperature range.

The sensing technology used for ATS535JSB subassembly is Halleffect based. The sensor incorporates a single-element Hall IC that switches in response to magnetic signals created by a ferrous target. 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.

A proprietary dynamic offset cancelation technique, with an internal high-frequency clock, reduces the residual offset voltage, which is normally caused by device overmolding, temperature dependancies, and thermal stress. This technique produces devices ATS535JSB that have an extremely stable quiescent output voltage, are immune to mechanical stress, and have precise recoverability after temperature cycling. Many problems normally associated with low-level analog signals are minimized by having the Hall element and amplifier in a single chip. Output precision is obtained by internal gain adjustments during the manufacturing process and operate-point programming in the user's application.

This sensor system is ideal for use in gathering speed, position, and timing information using gear-tooth-based configurations. The ATS535JSB/SSB are particularly suited to those applications that require accurate duty cycle control or accurate edge detection. The lower vibration sensitivity also makes these devices extremely useful for transmission speed sensing.