SNOAA90A february   2023  – may 2023 DRV5033-Q1 , LDC3114-Q1 , TMAG5170-Q1 , TMAG5170D-Q1 , TMAG5173-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Push Buttons
    1. 2.1 Mechanical Buttons
    2. 2.2 Hall-Effect Switches
    3. 2.3 Capacitive Touch Buttons
    4. 2.4 Inductive Touch Buttons
  6. 3Dials, Knobs, and Rotational Selectors
    1. 3.1 Mechanical Dials
    2. 3.2 Hall 3D Linear Dial
    3. 3.3 Encoder Using Hall
    4. 3.4 Encoder Using Inductive
    5. 3.5 Scroll Wheels
    6. 3.6 Rocker Switches
  7. 4Summary
  8. 5References
    1. 5.1 Device Support
    2. 5.2 Related Documentation
  9. 6Revision History

3.1 Mechanical Dials

Traditional implementations of mechanical rotary encoders use a metal brush that slides over metal contacts to show the change in rotational motion. These are simple implementations, but are prone to wear and tear as the metal contacts move. Mechanical potentiometers are built in a similar fashion but have a continuous change in resistance from the metal brush moving rather than discrete steps.