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LAUNCHXL-F28069M: Unexpected heating of the microcontroller.

Joan Marc Riera Pera
Prodigy 170 points

Part Number: LAUNCHXL-F28069M

Dear all,

I plugged my F28069M launchpad, into my computer for the first time, it is a brand new launchpad taken out of its anti-static bag. The demo program that runs by default sends the temperature via serial port, which works fine, However, after a couple of minutes of the demo program running, i see that the temperature starts rising quite a bit. And it is hot to the touch. Not so much that you get burned but i definetly can feel the microcontroller is hot. The values received via serial are:

".[u46 Celcius = Ref + 9 .[u45 Celcius = Ref + 8 " 

Is this normal? that the microcontroller heats up almost 10 ºC while just running the preprogramed demo software?

It is impossible that it got any form of electrostatic damage, because it is brand new and i took proper precautions... maybe this unit is faulty?

Thank you very much for your time!

Joan Marc

  • 0
    TI__Mastermind 42195 points

    Joan,

    That temperature reading is pretty inaccurate, so I wouldn't read too much into its absolute number.

    The micro typically does produce some heat when running code. The demo code is typically pretty simple and won't contribute to much heat. I wouldn't expect the device to be "hot", but I would expect you to be able to notice that it is a little warmer than ambient temperature.

    Is the device significantly warmer than the ambient?

    Regards,
    Cody 

  • 0 in reply to Cody Watkins
    Prodigy 170 points

    Hello Cody,

    In the first place, thank you very much for your time. I measured the temp. rise in the microcontroller, while running the demo code. I would say it is about 19 ºC when it reaches equilibrium, because at the lab there is an ambient temp. of about 23 ºC. So the thermal camera measures 42 ºC. Taking into account that this measure is not absolutelly precise, is a temperature rise of  about 20 ºC normal in this kind of microcontrollers? which temp. rise should i expect when running more demanding computations in this launchpad?

    Thanks again!

    P.S. i apologize if this is a dumb question, but i workes previouslly with MSP432 and that one wasn't warm at all, so i was surprised when i saw this one heating so much right out of the box...

  • +1 in reply to Joan Marc Riera Pera
    TI__Mastermind 42195 points

    Joan,

    Feel free to ask questions. MSP devices will create less heat than a C2000 device because they consume much less power. That being said this does seem to be drawing more power, and creating more heat than expected.

    Can you put the device in wait boot mode and see how hot it gets(the launch pad UG should describe how to do this)? I would expect the heat to appear with or without the device running.

    Either way we should be able to get you a replacement.

    Please follow the steps listed on this page to process an exchange.  If you are asked for TI approval you can refer them to this post that someone from the C2000 product line has approved a replacement controlCARD.

    https://www.ti.com/support-quality/additional-information/customer-returns.html

    Regards,
    Cody 

  • 0 in reply to Cody Watkins
    Prodigy 170 points

    Thank you very much for your answer. i set the S1 switch according to the user guide, (Low-High-Low), to enter wait boot mode. I attach a picture of the measured temp. This one should be more precise than the thermal camera. It measures about 38 ºC on the surface of the chip.