SLYA080 july   2023 TMAG5273

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Problem with Mechanical Knobs and Rotary Encoders
  5. 2Using 3D Hall Sensor for Angle Measurement
  6. 3On-Axis and Off-Axis Test
    1. 3.1 On-Axis Test
    2. 3.2 Off-Axis Test
  7. 4Push-Button Knob Function Test
  8. 5Summary
  9. 6References

Abstract

Knobs are widely used in many scenarios as a way for humans to interact with machines. Detecting the rotation angle of the knob is required in most applications. Compared with traditional knobs, knobs using Hall-effect sensors have more advantages. TI 3D linear Hall-effect sensors such as the TMAG5273 and TMAG5170 can measure magnetic fields in three directions, and can calculate angles in any two axes using the on-board CORDIC calculator allowing the MCU to read the angle directly. In addition, a push-button knob design can provide more versatile functions.