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TM4C1233H6PM: Communication Failure at Upper End of Operational Temperature Range

Ethan Lattinville
Prodigy 10 points
Part Number: TM4C1233H6PM

We are using this microcontroller (TM4C1233H6PM) within an assembly. We were running the assembly through some thermal testing, and noticed that it was failing at ~70 degrees C (operating upper limit is 85 degrees C). Specifically communication would cut out after the 5th bit of an 'S' command. Through troubleshooting, we ended up putting a 1K resistor in between (in series) the buffer and microcontroller, and the assembly now functions at higher temperatures. Does anyone know what could explain this?

  • +1
    TI__Guru**** 191486 points

    Hi,

      What is the S command? Can you elaborate what happened to the pin when the problem occurred beyond ~70C? Is it as described in the below errata? Understand that a 1k resistor is solving your problem.  If you can add some RC delay to slow down the rise time and observe the problem go away then it confirms that the problem is related to the errata.  

  • 0 in reply to Charles Tsai
    Prodigy 10 points

    Hey Charles, my colleague was able to better elaborate what we were experiencing on another forum. Your insight was very helpful and correct. Thank you again!