ams offers its wide range of high-performance position sensors suitable for industrial, medical, robotics, automotive, and consumer applications. Their patented technology makes all position sensors immune to external stray field, yielding to higher robustness, lower system cost (no magnetic shield needed) and adherence to the most stringent safety requirements.

The AS5311 is an incremental position sensor for linear and rotary off-axis applications based on contactless magnetic sensor technology. To measure position and motion a multi-pole magnet strip or ring has to be used. There are 4096 pulses (12-bit) per 2 mm pole pair length on the standardized quadrature output interface with an index pulse (=ABI-interface), offering a maximum speed of 650 mm/sec in Incremental mode.

A multi-pole magnetic strip or ring, with a pole length of 1 mm, is required to sense the rotational or linear motion. The magnetic strip is placed above the IC at a distance of typically 0.3 mm. The absolute measurement provides instant indication of the magnet position within one pole pair, with a resolution of 488 nm per step (12-bit over 2 mm). This digital data is available as a serial bit streamed as a PWM signal. Furthermore, an incremental output is available with a resolution of 1.95 μm per step. An index pulse is generated once for every pole pair (once per 2 mm).The travelling speed in incremental mode is up to 650 mm/second. An internal voltage regulator allows the AS5311 to operate at either 3.3 V or 5 V supplies. Depending on the application, the AS5311 accepts multi-pole strip magnets as well as multi-pole ring magnets, both radial and axial magnetize.