AS5140 – Automotive Rotary Encoder IC

AS5140 – Automotive Rotary Encoder IC

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.

Features and Benefits
  • 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
Applications
  • Automotive applications:
    • Engine compartment sensors
    • Transmission gearbox encoder
    • Throttle valve position control
  • Industrial applications:
    • Rotary sensors in high temperature environment

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