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Magnetic encoder IC zooms in on automotives

Posted: 09 Oct 2008 ?? ?Print Version ?Bookmark and Share

Keywords:magnetic encoder IC? automotive?


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

According to the company, 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 16bit sinus and 16bit 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 150 C, no additional temperature compensation and calibration of the device is

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

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