The ATS468 is a true zero-speed gear tooth sensor IC consisting of an optimized Hall IC and a permanent magnet pellet configuration in a single overmolded package. The integrated circuit provides a manufacturer-friendly solution for digital gear tooth sensing applications. This small package can be easily assembled and used in conjunction with gears of various shapes and sizes.
The integrated circuit incorporates dual Hall effect elements with a 2.2 mm spacing and signal processing that switches in response to differential magnetic signals created by a ferromagnetic target. The circuitry contains a sophisticated digital circuit to reduce system offsets, to calibrate the gain for air-gap–independent switchpoints, and to achieve true zerospeed operation. Signal optimization occurs at power-on through the combination of offset and gain adjust, and is maintained throughout the operating time with the use of a running-mode calibration. The running-mode calibration provides immunity to environmental effects such as micro-oscillations of the target or sudden air gap changes.
The device is ideally suited to obtaining speed and duty cycle information in gear tooth–based speed, position, and timing applications, such as in speedometers.
The ATS468 is available in two 4-pin SIPs (suffix SG and SJ). The packages are lead (Pb) free, with 100% matte tin leadframe plating.
