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.

  • TI Thinks Resolved

Effect of low temperature to GPIO's schmitt trigger threshold

Guru 56650 points

Replies: 3

Views: 594

Hi Team,

A customer is using MSP430F1122 and they are having issue of missing GPIO interrupt at low temperatures (-10 degC). The MSP is powered by 3.6V battery, and they are feeding pulses between 2.8 - 3.2.V with 20us wide, rise/fall time around 2 us. 

At normal room temperature, they see that they are getting the correct GPIO interrupts, but they are missing in the low temperatures.

Is this something expected? What would be the approximate threshold in -10 degC for 3.6V supply?

Thanks.

Regards,

Leo Hendrawan

  • Hi Leo,

    Errata PORT3 mentions that "port interrupts can get lost if they occur during CPU access of the P1IFG and P2IFG registers". Is the customer's code doing this? Perhaps, the cold temperature is affecting the timing of the code execution and causing this scenario to occur.

    Regards,

    James

    MSP Customer Applications

  • In reply to James Evans:

    Hi Leo,

    Was the customer able to resolve their issue?

    Regards,

    James

    MSP Customer Applications

  • In reply to James Evans:

    Hi Leo,

    I'm closing this thread.

    Regards,

    James

    MSP Customer Applications

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.