Magnetic rotary position sensor works with simple target magnet
The differential sensing technology in the MA980 from Monolithic Power Systems provides high immunity to interference from stray magnetic fields, to produce stable performance in magnetically noisy environments.
The MA980 from Monolithic Power Systems is a miniature angle position sensor based on a differential magnetic field measurement technology which is ideal for sensors operating with a simple, low-cost target magnet.
The sensor detects the absolute angular position of a permanent magnet, typically a diametrically magnetized cylinder mounted at the end of a rotating shaft. The sensor’s differential method of magnetic flux measurement eliminates the effect of parasitic magnetic fields induced by high-voltage cabling, electric motors, and other sources.Â
The MA980 is suitable for use in battery-powered applications that require low average power consumption thanks to its ability to perform duty cycling. The timing of the power cycles can be controlled by an on-chip clock or by an external controller. Flags are available for detecting a definable amount of angle change.
On-chip non-volatile memory provides storage for configuration parameters, including the reference zero angle position, the power cycling parameters, the filter window affecting the output resolution, and magnetic field detection thresholds.