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AS5140 – Automotive Rotary Encoder IC

10-bit magnetic rotary encoder with absolute SSI, PWM, and incremental outputs


ams' AS5140H is a contactless magnetic rotary encoder for accurate angular measurement over a full turn of 360° and over an extended ambient temperature range of -40°C to 150°C. 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 0.35° = 1024 positions per revolution. This digital data is available as a serial bit stream and as a PWM signal. Furthermore, a user-programmable incremental output is available. An internal voltage regulator allows the AS5140H to operate from either a 3.3 V or 5 V power supply. The AS5140H is pin-compatible to the AS5040; however, it uses low-voltage OTP programming cells with additional programming options. ams' AS5140 – Automotive Rotary Encoder IC

Features Applications
  • 2-digital 10-bit absolute outputs:
    • Serial interface
    • Pulse width modulated (PWM) output
  • 3-incremental output modes:
    • Quadrature A/B and Index output signal
    • Step / Direction and Index output signal
    • 3-phase commutation for brushless DC motors
  • Automotive applications:
    • Engine compartment sensors
    • Transmission gearbox encoder
    • Throttle valve position control
  • Industrial applications
    • Rotary sensors in high temperature environment

Digi-Key P/N ams P/N Description  
AS5040 PB-ND AS5040 PB BOARD PROGRAM AS5040 Datasheet
AS5140 DB-ND AS5140 DB BOARD DEMO AS5140 Datasheet
AS5140 AB-ND AS5140 AB BOARD ADAPTER AS5140
AS5140H-ASSMCT-ND AS5140H-ASSM IC ENCODER PROG 10-BIT 16-SSOP
Available in Tape & Reel (-2-ND), Cut Tape (-1-ND), and custom Digi-Reel® (-6-ND)