14-bit magnetic encoder IC offers reliable measurements in noisy industrial environments
The AS5048 provides a PWM output and either an SPI or I2C interface, it supplies absolute angle measurements to a host microcontroller. The application’s mechanical design does not need to allow for precise initial alignment of the sensor IC and the two-pole magnet it is paired with: instead, the zero position is programmed into the AS5048 one time only on assembly, via a simple SPI or I2C command, with no requirement for a special programming device. The AS5048 is also highly tolerant of misalignment between the sensor IC and its paired magnet and of variations in the air gap, as well as of variations in temperature from -40 to +150°C.
The AS5048 offers more precise measurement than previous members of austriamicrosystems’ family of magnetic rotary encoders. Its 14-bit measurement engine provides for resolution down to 0.0219°. With linearization and averaging implemented in the host microcontroller, it can deliver angle measurements accurate to 0.05°. The AS5048 also takes advantage of proprietary manufacturing processes developed at austriamicrosystems’ wafer fab in Graz, Austria which enable the production of extremely sensitive analog circuits. The IC’s high sensitivity means that it can be paired with low-cost magnet types such as ferrites, operating reliably in magnetic fields as weak as 30mT. An internal voltage regulator enables the AS5048 to operate from either a 3.3V or 5V supply. It is available in a 14-pin TSSOP package. Multiple devices can be daisy-chained to produce a serial data read-out.
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