Monolithic Power Systems – Magnetic sensors provide reliable contactless angle measurement for rotary motion applications

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Monolithic Power Systems’ MagAlpha range of magnetic position sensors uses the innovative SpinAxis™ Hall-effect sensing technique to provide fast and accurate angular position measurements.

The MagAlpha range includes the MA702, MA704, MA710 and MA730 parts which measure the angle of rotation at a resolution from 10-bit to 14-bit, and provide their outputs over digital SPI or SSI channels, and via incremental ABZ quadrature and PWM outputs.

Also in the MagAlpha range, the MA302 and MA310 feature SPI and incremental ABZ interfaces, and additionally offer UVW signals for use in Brushless DC (BLDC) motor commutation.

A notable feature of SpinAxis technology is the ability to maintain low measurement latency at very high rotation speeds.

A direct phase-to-digital conversion replaces the complex sine-cosine + arctangent method traditionally used by competing magnetic position sensors. Using SpinAxis technology, the MagAlpha sensors are able to capture angle measurements at higher speed and with lower latency.

MagAlpha position sensors may be placed at the end of the rotating shaft, paired with a two-pole diametric polarised magnet. They also support a side-of-shaft magnet topology, giving the designer greater flexibility in the mechanical design of the system.

MagAlpha sensors are packaged in a cost effective 3mm x 3mm QFN package.

FEATURES

  • 1MHz sampling frequency
  • 10μs angle measurement latency at rotation speeds up to 100krpm
  • Magnetic field range: 15mT to 150mT
  • 3.3V supply voltage
  • 12mA operating current
  • Operating-temperature range: -40°C to 125°C
  • AEC-Q100 Grade 1 qualified parts available

APPLICATIONS

  • Actuators
  • BLDC motors

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The TBMA is a test board for the MagAlpha magnetic position-sensor family. TBMA boards are supplied in one of two formats: round for end-of-shaft configurations, and long, in which the sensor is mounted on the edge of the board for side-of-shaft and end-of-shaft configurations.

Orderable Part Numbers: TBMA-Q-RD: Round, TBMA-Q-LT: Long