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Is that possible to power off the ICDI part on Launchpad

Guojin Feng1
Prodigy 180 points

Hello, I add a battery boosterpack for my TIVA C launchpad and want the board to work alone without connecting power cables.

But I found a problem that the ICDI debug unit is powered on as well, as I measure the power supply pin of the ICDI unit, the voltage is at 3.3V. I tried the power swithes on the Launchpad, it seems this is just for selecting the power source whether from the DEBUG or device USB connector while the battery connects to the output of this switch. 

Is there any one has similar requirements as mine? How can I do to power off the ICDI unit?

Thank you.

  • 0
    TI__Guru**** 244400 points

    Hello Guojin,

    You would need to blue-wire the booster pack to the TM4C123 board to allow only the main MCU to get power while ICDI is not powered. But before you do this, remove the H24-H25 header on the TM4C123 LaunchPad. Then connect the +3.3V from the boosterpack to the H24 header.

    Regards

    Amit

  • 0 in reply to Amit Ashara
    Prodigy 180 points

    Hello Amit,

    Thanks for your reply, which I have tried your method. It works!

    But in the process, some details may need the attention of someone having similar requirements.

    The +3.3 V on the header J1 and the one near SW2 connects directly to the output of U8, which means if you want to power off the ICDI, you need to connect the external +3.3V to the H24 header.

    Besides, the +5V from boosterpack should not connected to the header, or it will power up U8.

    The triple colour LED D1 is connected to VBUS, so it cannot be used to judge the working status of the MCU.