High-resolution magnetic encoder targets automotive applications

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

The AS5145 is a contactless, complete system-on-chip magnetic rotary encoder for accurate angular measurement over a full turn of 360° with a resolution of 0.0879° = 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 synchronize external electronics with itself as well as a Sin/Cosine digital output mode. If this mode is activated, a 16 bit sine and 16 bit cosine 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 3.3 V or 5 V supplies. Despite the wide ambient temperature range of up to 150°C, no additional temperature compensation and calibration of the device is required. The AS5145 is available in a lead-free SSOP-16 package.

Pricing: $6.94 each in 1,000-unit quantities.
Availability: Now.
Datasheet: Click here.


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