austriamicrosystems AS5245: 12-bit magnetic rotary encoder aims at automotive applications
EDN Staff - December 23, 2009
Based on the vendor’s stacked-die technology, the 12-bit AS5245 fail-safe magnetic-rotary-encoder IC targets use in pedals, transmission, steering wheels, and other automotive applications. Providing improved phase-matching capabilities, the device requires no additional temperature compensation, calibration, or shielding against external magnetic stray fields. The digital-angle data of the encoder comes in the form of a serial interface or as a PWM signal. Designers can enable an incremental quadrature-output mode with an improved interpolation algorithm and permanently program it with 10- or 12-bit resolution. Standard features include user-specified zero programming, Chip-ID, diagnostic functions for the correct positioning of the magnet, operation over a 3.3 or 5V supply, and an ambient-temperature range as high as 150°C. Available in a QFN-32 package, the AS5245 costs $12.22 (1000).