AS5132 Magnetic Rotary Encoder

By ams 107

AS5132 Magnetic Rotary Encoder

ams' AS5132 contactless magnetic rotary encoder that enables accurate angular measurement over a full 360° turn. It is a system-on-chip, combining integrated Hall elements, an analog front end, and digital signal processing in a single device. To measure the angle, only a simple two-pole magnet, rotating over the center of the Hall element position, is required.

The absolute angle measurement provides instant indication of the magnet's angular position with a resolution of 8.5-bit, or 360 positions per revolution. This digital data is available as serial output over the interface and as a pulse width modulated (PWM) signal. An additional UVW output can be used for a block commutation for a brushless DC motor. To improve the torque over speed, a pre-commutation is possible. An incremental signal is available as an option.

Features and Benefits
  • Two digital absolute outputs (8.5-bit): serial interface and PWM output
  • Incremental output with adjustable number of pulses
  • BLDC output UVW, selectable for 1-, 2-, 3-, 4-, 5-, and 6-pole pairs
  • Supports external PWM clock mode
  • Static and dynamic pre-commutation feature
  • High speed: up to 72,900 rpm
  • 9-bit multi-turn counter
  • User programmable zero position and sensitivity
  • Direct measurement of magnetic field strength allows exact determination of vertical magnet distance
  • Incremental outputs: ABI quadrature of 90 ppr, step direction of 180 ppr, and fixed pulse width of 360 ppr
  • Wide magnetic field input range: 20 to 80 mT (typ.)

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