• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 79 subscribers
  • Views 251 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

MSP430FR2155: Max VIH threshold of SBWTCK (pin 4)

Yen Ting Chu
Intellectual 1350 points
Part Number: MSP430FR2155


Hi Team,

What is the Max VIH threshold of SBWTCK (pin 4) of MSP430FR2155TPR when VCC is 3.3V?

What I only could find from datasheet is section 5.13.5, table 5-11

VCC 2.0V -> VIH Threshould Max is 1.5V (= 0.7 times of 2.0V)

VCC 3.0V -> VIH Threshould Max is 2.25V (= 0.7 times of 3.0V)

So if I use 0.75 times of VCC,

Does it mean VCC 3.3V -> VIH Threshould Max is 2.475V (= 0.7 times of 3.3V) ?

Best regards,

Andy Chu

  • 0
    TI__Genius 14755 points

    Hello,

    The specification you are referencing above has only been characterized at a VCC of 2V and a VCC of 3V. You are correct that according to the datasheet, the trend is that the VIH Threshold Max is ~75% of the VCC level so this trend is likely to also apply to a VCC of 3.3V but I cannot guarantee that specification because it has not been tested.

    If your customer wants to validate this theory they can run a test where the input voltage on that pin rises to ~75% of VCC and confirm that the MCU reports a valid "High" 100% of the time.

    Best regards,

    Matt

**Attention** This is a public forum