Austriamicrosystems offers magnetic rotary encoder

Edited by the Electronicstalk editorial team Oct 8, 2008

Austriamicrosystems has expanded its magnetic rotary encoder portfolio with the AS5145, a 12-bit encoder IC especially designed for the growing demands in the automotive industry.

The AS5145 is a contactless, complete system-on-chip magnetic rotary encoder for accurate angular measurement over a full turn of 360deg with a resolution of 0.0879deg = 4096 positions per revolution.

This digital angle data is available using a simple serial interface or as PWM signal.

In addition, an incremental quadrature output mode with an improved interpolation algorithm can be enabled and permanently programmed with a resolution of 10 up to 12 bits.

Due to the higher noise performance the accuracy is further improved.

Besides all standard features of Austriamicrosystems' encoder family such as user-specific zero programming, Chip-ID and diagnostic functions for the correct positioning of the magnet, the AS5145 additionally provides a special feature to synchronise external electronics with itself as well as a Sin/Cosine digital output mode.

If this mode is activated, a 16 bit sinus and 16 bit cosines digital data of both channels will be switched out and an accurate calculation can be done externally.

For cascading multiple devices, a 'Daisy Chain' mode is implemented allowing position data to be read out over the serial two-wire-bus.

An internal voltage regulator allows the AS5145 to operate at either 3.3V or 5V supplies.

Despite the wide ambient temperature range of up to 150C, no additional temperature compensation and calibration of the device is required.

The AS5145 is available in a lead-free SSOP-16 package.