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AS5045 Rotary Position Sensor

12-bit Rotary Position Sensor with Digital Angle (interface) and PWM Output

The AS5045 is a 12-bit rotary position sensor (previously known as encoder) for absolute angular measurement and with a PWM (=pulse width modulation) output 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 and the zero position can be programmed into the device. 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 (SSI) and on the PWM output signal.

AS5045 12-bit programmable magnetic rotary position sensor block diagram AS5045 12-bit programmable magnetic rotary position sensor demoboard diagram AS5045 Adapter Board diagram

Key Features

  • Contactless absolute angle position measurement
  • Contactless absolute angle position measurement
  • User programmable zero position
  • Diagnostic modes for magnet detection and power supply loss
  • Immune to external magnetic stray fields

Key Benefits

  • Highest reliability and durability in harsh environments
  • Great flexibility during assembly
  • Operation safety
  • Lower material cost (no magnetic shielding needed)


  • Angle sensor
  • Rotary knobs
  • Replacement of potentiometers
  • Robotic joint position

AS5045 Product Facts

Resolution 12-bit
Interfaces SSI
Output Digital Angle (Interface) / PWM
Max speed [rpm]
Overvoltage protection [ ]
Supply voltage [V] 3.3 or 5.0
Temperature range [°C] -40 to +125
Package SSOP-16
Automotive qualified