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AS5145 – Automotive Rotary Encoder IC


Programmable magnetic rotary encoder optimized for brushless DC motors


ams' AS5145 is a contactless magnetic rotary encoder for accurate angular measurement over a full turn of 360°. It is a system-on-chip, combining integrated Hall elements, analog front end, and digital signal processing in a single device. To measure the angle, only a simple 2-pole magnet, rotating over the center of the chip, is required. The magnet may be placed above or below the IC. The absolute angle measurement provides instant indication of the magnet's angular position with a resolution of 0.0879° (4906 positions per revolution). This digital data is available as a serial bit stream and as a PWM signal. An internal voltage regulator allows the AS5145 to operate at either 3.3V or 5V supplies. austramicrosystems' AS5145 – Automotive Rotary Encoder IC

Features Applications
  • Contactless high resolution rotational position encoding over a full turn of 360°
  • Pulse Width Modulated (PWM) outputs
  • Three incremental outputs
  • Failure detection mode for magnet placement monitoring and loss of power supply
  • Wide temperature range: -40°C to +150°C
  • Industrial applications
    • Contactless rotary position sensing
    • Robotics
  • Automotive application:
    • Steering wheel position sensing
    • Transmission gearbox encoder
    • Headlight position control

Digi-Key P/N ams P/N Description  
AS5145H-HSST-500TR-ND AS5145H-HSST-500 IC ENCODER ROTARY 16-SSOP Datasheet
AS5040 PB-ND AS5040 PB BOARD PROGRAM AS5040 Datasheet
AS5145 DB-ND AS5145 DB BOARD DEMO AS5145 Datasheet
AS5145 AB-ND AS5145 AB BOARD ADAPTER AS5145 Datasheet
Available in Tape & Reel (TR-ND), Cut Tape (CT-ND), and custom Digi-Reel® (DKR-ND)