The AS5311 from Austriamicrosystems AG, Unterpremstaetten, Austria, is a Hall-effect sensor-based linear magnetic encoder capable of submicron resolution. For linear motion sensing, a multipole magnetic strip is used and for rotary motion sensing the magnetic strip is replaced by a multipole magnetic ring. An incremental output with 10-bit resolution per pole pair and a traveling speed up to 650 mm/s is available. 16-bit resolution is possible using a multipole magnetic ring with a 41.7 mm dia. Used with a 2 mm pole-pair magnetic strip the device provides a 1.95 µm resolution signal (incremental) and a 488 nm resolution signal (serial output). The encoder chip also constantly monitors the placement of the magnet above the device, allowing early detection of mechanical systems failures.
Linear Hall Encoder from Austriamicrosystems