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AS5055A Rotary Position Sensor

12-bit Magnetic Position Sensor with Digital Angle (interface) Output

The AS5055A is a new version of the AS5055. It is a 12-bit rotary position sensor (previously known as encoder) for absolute angular measurement over a full turn of 360° based on contactless magnetic sensor technology. This device fits perfectly for on-axis applications where a simple 2-pole magnet rotates above or below the sensor IC. The absolute magnet angular position is measured with a resolution of 12 bit = 4096 positions per revolution and it is provided as a digital value on the serial interface (SPI).

AS5055A 12-bit magnetic position sensor with digital angle output

Key Features

  • Contactless absolute angle position measurement
  • Contactless absolute angle position measurement
  • Very low standby current
  • Very small package
  • Immune to external magnetic stray fields

Key Benefits

  • Highest reliability and durability in harsh environments
  • Sensor for battery operated devices
  • Lower material cost (no magnetic shielding needed)


  • Robotic joint position
  • Rotary knobs
  • Motor position and motor sensor
  • Position sensor for battery operated equipment

AS5055A Product Facts

Resolution 12-bit
Interfaces SPI
Output Digital Angle (Interface)
Max speed [rpm]
Overvoltage protection [ ]
Supply voltage [V] 3.3
Temperature range [°C] -40 to +85
Package QFN-16
Automotive qualified