Linear/rotary encoders cut configuration time

With fixed resolution and automatic correction for gain and offset, the AS5304 and AS5306 magnetic encoder ICs from austriamicrosystems eliminate user programming and save the host controller from performing register configuration.

Both devices combine Hall-sensor elements and signal processing, and are suitable for linear or offaxis rotary sensing. High sensitivity allows them to detect magnetic fields as weak as 5mT. The devices also have a high magnet-to-IC air-gap tolerance yet are also highly immune to external magnetic fields. Further benefits include single-track operation, which allows the use of low-cost magnets.

The AS5304 has fixed resolution of 25µm, while the AS5306 can detect movements as small as 15µm. When mounted off-axis under a multi-pole magnetised ring, or directly under a linear multipole magnet, the encoder produces an index output and incremental A/B quadrature outputs providing 40 pulses per magnet-pole period. With a magnetic ring of 32 pole pairs, this equates to 5120 positions per revolution, or 12.3-bits resolution, and supports maximum speed of 9375rpm. The AS5304 requires a magnet with 4mm pole-pair length, and the AS5306 requires 2.4mm pole-pair length.

 

FEATURES 5V operation 20-pin TSSOP package Magnetic field strength alarm indicator Optional push-pull or open-drain outputs Operating temperature range: -40°C to 125°C

APPLICATIONS Industrial drives Robotic systems Linear X-Y stages Rotation knobs

 

 

 

austriamicrosystems / AS5304/AS5306