The ATS685 is an optimized Hall-effect sensing integrated circuit and rare-earth pellet combination that provides a user-friendly solution for true zero-speed digital gear-tooth sensing in two-wire applications. The sensor IC consists of a single-shot molded plastic package that includes a samarium cobalt pellet, a pole piece, and a Hall Effect IC that has been optimized to the magnetic circuit. This small package can be assembled simply and used in conjunction with a wide variety of gear shapes and sizes.
The single integrated circuit incorporates a dual element Hall-effect sensor IC and signal processing circuitry that switches in response to differential magnetic signals created by ferromagnetic targets. The device contains a sophisticated compensating circuit to eliminate magnetic and system offsets. Digital tracking of the analog signal is used to achieve true zero speed operation. Advanced calibration algorithms are used to adjust the device gain and offset at power-up, resulting in air gap independent switchpoints, which greatly improves output accuracy. In addition, advanced algorithms mitigate the effect of system anomalies such as target vibration and sudden changes in air gap.
The regulated current output is configured for two-wire operation. This sensor IC is ideal for obtaining edge and duty cycle information in gear-tooth–based applications such as transmission speed.
The ATS685 is provided in a 4-pin SIP package that is lead (Pb) free, with 100% matte tin leadframe plating.
