SLIA096 January   2022 DRV5021 , DRV5021-Q1 , DRV5023 , DRV5023-Q1 , DRV5032 , DRV5033 , DRV5033-Q1 , TMAG5123 , TMAG5123-Q1 , TMAG5124 , TMAG5124-Q1 , TMAG5231 , TMAG5328

 

  1.   Trademarks
  2. 1Introduction
  3. 2Design Process
    1. 2.1 Mechanical Implementation
    2. 2.2 Magnetic Implementation
    3. 2.3 Magnet Sensor Placement
    4. 2.4 Prototyping and Bench Testing
    5. 2.5 Layout
    6. 2.6 Bench Testing
    7. 2.7 Bench Results
    8. 2.8 Error Sources
      1. 2.8.1 Offsets
      2. 2.8.2 Roll, Yaw, and Pitch
      3. 2.8.3 Magnet Variation
      4. 2.8.4 Device Variation and Temperature Drift
      5. 2.8.5 External Fields
      6. 2.8.6 Nearby Material Influence
      7. 2.8.7 Bench Setup Error
  4. 3Summary

Bench Setup Error

Yet another possible source of error is related to how the bench test is performed on the prototype. In this case, the rocker switch performance is assessed through video frames. The camera orientation and the resolution of the post-processing program could have affected the accuracy. Figure 2-35 and Figure 2-36 are extreme cases used to help illustrate the error. However, the errors in the assessment were significantly smaller. Figure 2-35 shows how the base used for calculation has some pitch from the actual base. The right image in Figure 2-36 shows how some yaw with respect to the viewing angle leads to a larger measurement angle when both rockers are in the same default position.

Figure 2-35 Image Pitch
Figure 2-36 Captured Body With Yaw