MagDiff magnetic digital angle position sensor with stray-field immunity

As a contactless, precision, magnetic absolute angle position sensor, the MA900 extracts the angle from the magnetic field differences at several locations on the sensor IC. By using the differential method, the contribution of a parasitic magnetic field is eliminated. This makes the MA900 digital angle sensor suitable to be positioned at the end-of-shaft, using a simple dipole target magnet.

Fast data acquisition and processing enable the MA900 to provide accurate angle measurements at speeds of between 0 rpm to over 100,000 rpm, and the sensor is robust against parasitic stray fields over 4 kA/m dc or 5 mT with zero lag.

The magnetic field strength detection features configurable thresholds to sense magnet proximity. This can be used to sense the axial position of the knob, or for diagnostics.

The settings are stored in the on-chip non-volatile memory (NVM). These settings cover the reference zero angle position, in addition to the ABZ quadrature encoder interface which offers configurable pulses-per-turn (PPT), and the configuration of the UVW interfacewhich offers 1-to-8 pole pair emulation.

The MA900 is offered in a QFN-16 package which has a space-saving 3 mm x 3 mm footprint and wettable flanks. With qualification to AEC-Q100, the MAQ900 will be released in 2025, and the MAQ79010 with ASIL B will follow in 2026.