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TMS320F28379S: Comparator 5 toggling without input at cold temperatures

Thomas MacGregor
Prodigy 20 points
Part Number: TMS320F28379S

Tool/software:

We are having a strange problem with one of our processors and I was looking to see if there is any guidance as to why this may be happening. A client found that at temperatures less than -15C, Comparator 5 would begin tripping without any input to the pin on the processor. The program on this processor has been verified, and no other device experiences this problem in the same configuration. We verified that there is no external noise on the input pin to this device, and the ADC result register tied to that comparator is not experiencing any jumps in value. The comparator status was verified via a Code Composer Studio debug session to be switching without any external input, only affected by cold temperature. Is this just a defective component?

  • 0
    TI__Genius 17401 points

    Hi Thomas,

    Can you clarify what is meant by no input to the CMPSS pin? Do you mean that it is left floating or that it is tied to the board GND (or the same voltage as board GND by some external input). We don't spec floating signals so that is something that may have variance across devices

    Are you able to scope the CTRIPOUTH signal out onto a GPIO test point pin and show what that looks like and how often it is triggering? 

    Are you enabling sync/filtered output, hysteresis, or blanking window?

    Regards,

    Peter