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Thermal limitation - C6747 / C6748

DI NALLO Fabien
Prodigy 50 points

Hello,

In our application, we use the TMS320C674x for its calculation features only.

We use 1 SPI (boot loader) connected to an other microcontroller + the data bus (32 bits + 10 address) connected to an asynchronous SRAM, we don't use any other peripheral.

The external ambient temperature is around 90°C in our application.

What is happening on the DSP if the temperature increases ? Is there any disjonction or physical destruction ?

At a temperature below the potentiel disjonction or destruction, in our application, is there any modification of the performance in term of calculation feature (GFlop) ?

Thanks for your suppport.

  • 0
    TI__Expert 4760 points

    Hi Fabien,

    Which part are you using commercial or industrial grade?

    If its commercial grade and you’re going beyond 90c temperature, will not guaranteed proper device operation.

    Better go with industrial grade component, which can withstand up to -40 to 105 for proper device operation.

    You can opt for heat sink also just in case

     Regards

    Antony

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  • 0 in reply to Antony Samsunil
    Prodigy 50 points

    Hi Antony,

    Thanks for your answers.

    I use the industrial grade.

    I'm not speaking about the guaranty of the component.

    What is physically happening when the temperature increase above 105°C, is there disjonction or destruction at higher temperature ?

    Fabien

  • 0 in reply to DI NALLO Fabien
    Prodigy 50 points

    To be more precise, what is happening at 125°C ?

    Is there any die temperature measurement in the DSP ?

    Fabien

  • 0 in reply to DI NALLO Fabien
    TI__Guru* 83885 points

    Hi

    There is no mechanism on chip to measure on die or junction temperature etc.

    By running it way out of spec, you are impairing the reliability of the chip and are working in a temperature zone where the datasheet behavior cannot be expected. The part is not tested to run at 125C and meet the functional requirements etc.

    Regards

    Mukul