SLAA843A August   2018  – March 2019 MSP430FR2512 , MSP430FR2512 , MSP430FR2522 , MSP430FR2522 , MSP430FR2532 , MSP430FR2532 , MSP430FR2533 , MSP430FR2533 , MSP430FR2632 , MSP430FR2632 , MSP430FR2633 , MSP430FR2633

 

  1.   Sensitivity, SNR, and design margin in capacitive touch applications
    1.     Trademarks
    2. 1 Overview
      1. 1.1 Design Objectives
        1. 1.1.1 Reliability
        2. 1.1.2 Robustness
      2. 1.2 The Designer's Dilemma
    3. 2 Recommended Actions for Developers
      1. 2.1 Run SNR and Design Margin Tests
    4. 3 Terminology
      1. 3.1 Signal (S)
      2. 3.2 Noise (N)
      3. 3.3 Threshold (Sensitivity) (Th)
      4. 3.4 Design Margin
        1. 3.4.1 False Detection Margin (Min)
        2. 3.4.2 Detection Margin (Mout)
      5. 3.5 Signal-to-Noise Ratio (SNR)
      6. 3.6 Advice
    5. 4 CapTIvate Device Performance
      1. 4.1 Minimum Recommended Values
      2. 4.2 CapTIvate Device SNR
    6. 5 Interpreting the Results
      1. 5.1 Interpreting the Advice
      2. 5.2 Check Other Results
    7. 6 Application of Terms
      1. 6.1 Count and Percent Change Analysis With 7.5-mm Overlay, Advice = POOR
      2. 6.2 Count and Percent Change Analysis With 1.5-mm Overlay, Advice = GOOD
      3. 6.3 Count and Percent Change Analysis (1.5-mm Overlay vs 7.5-mm Overlay)
      4. 6.4 Effect of Post-Processing and Sampling Rate
    8. 7 Summary
  2.   Revision History

Revision History

Changes from August 18, 2018 to March 25, 2019

  • Added Yiding Luo as an authorGo
  • Changed the recommended CapTIvate Design Center version in the first note in Section 2.1, Run SNR and Design Margin TestsGo
  • Added Figure 2, Selecting OptionsGo
  • Added "Ct / Cp" to the Symbol column of the Signal row in Table 1, Example of Computing SignalGo
  • Added the second paragraph in the note in Section 3.1, Signal (S)Go
  • Added Figure 5, Signal Terminology, and the paragraph before it in Section 3.1, Signal (S)Go
  • Added the paragraph that begins "In this SNR analyze tool..." through Figure 7 in Section 3.3, Threshold (Sensitivity) (Th) and updated the following noteGo
  • Moved Section 3.4, Design MarginGo
  • Added Figure 8, Design Margin TerminologyGo
  • Added Section 3.6, AdviceGo
  • Added Section 4.1, Minimum Recommended ValuesGo
  • Added Section 4.2, CapTIvate Device SNR, and updated contents moved from Section 4Go
  • Moved and updated Section 5, Interpreting the ResultsGo
  • Added Section 6.3, Count and Percent Change Analysis (1.5-mm Overlay vs 7.5-mm Overlay)Go