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MSP430FR6989: Input threshold levels at VCC=2.8V ?

Robert Finger
Mastermind 18263 points

Part Number: MSP430FR6989

Team, 

The datasheet is only showing the digital input threshold levels for 2.2 V and 3.0 V supply. How are these levels if VCC=2.8 V?

Thanks,
  Robert

  • 0
    TI__Mastermind 27230 points

    Hi Robert,

    The threshold values tend to be a ratio of your VCC levels. Here are my approximations for 2.8V. (A curve can be created if you need a higher accuracy for the min and max thresholds)

    Positive Input Threshold
    VCC Min Min Ratio Max Max Ratio
    2.2 1.2 0.545 1.65 0.75
    3 1.65 0.55 2.25 0.75
    Approximation 2.8 ~1.53   2.1  
    Negative Input Threshold
    VCC Min Min Ratio Max Max Ratio
    2.2 0.55 0.25 1 0.4545
    3 0.75 0.25 1.35 0.45
    2.8 0.7   ~1.26  

    Regards.
    Luke

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