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EK-TM4C1294XL Power source options

Other Parts Discussed in Thread: EK-TM4C1294XL

Hello,

I purchased the EKTM4C1294XL development kit to begin prototyping a new project.  The board seems to be working as expected but I seem to have a scenario that isn't supported.  I want to power the board with the BoosterPack pins and use the TargetUSB as a host.  When the boosterpack is chosen as the power source, the 5V to the target USB is not provided.  I can use the breadboard portion to connect 5V to the USB, but I thought would ask if there was another method that I was just missing.

Any help would be appreciated.

Thanks,

Todd

  • Hello Todd,

    Which BoosterPack are you using? Also when you mention the TargetUSB as a Host you mean the TM4C129 as a Host Controller and then provide 5V on the VBUS pin of the USB micro connector (component U7)?

    Regards

    Amit

  • Hello Amit,

    Thanks for the quick response.  I am using the EK-TM4C1294XL launchpad evaluation board. I want to use the TM4C1294 as the host controller for the USB and then connect a device to the Micro-A/B connector by the Ethernet connector on the launchpad.  I'm not using a boosterpack but I'm using the booster pack power entry pins (3.3V/5V) to power the board.

    When I set the jumper to the booster pack power source, the 5V to the target USB connector (not the ICDI) is disabled and I was wondering if I has a misunderstanding of how the evaluation board works.  I would like to provide power to the board and the USB connector from the booster pack pins.  Or find and equivalent implementation.

    Thanks,

    Todd

  • Hi Amit,

    Also - yes it is component U7 - that's what I was calling the target USB.  I got that from the schematics.

    Thanks,

    Todd

  • Hello Todd

    Page-31 of the Tiva™ C Series TM4C1294 Connected LaunchPad Evaluation Kit User Guide would answer the question. I have added a snapshot.

    Regards

    Amit

  • Thanks Amit. I was looking at manually attaching a 5V supply to the USB and will use JP1 to do that.

    Thanks,

    Todd

  • Todd,

    I'm in the same boat (a year after you) and wondering, did you go ahead with this approach, and did it work? If not, how did you solve the problem?

    Thanks,
    Jason
  • Hello Jason,

    If you can describe the scenario for the power then may be I can suggest something. Is it the same as Todd's?

    Regards
    Amit
  • Thank you, Amit.

    I am using a TM4C1294XL, and I have made a boosterpack for it to interface with my front panel and sensors. I have included a 5V regulator on my boosterpack, which presently powers the TM4C1294XL and the other circuitry.

    Now, I would like the TM4C1294XL to host a USB modem. But then I discovered the same issue that you and Todd already discussed: when powered by a boosterpack, the board does not supply power to the target USB connector.

    Jason
  • Hi Jason,

    It's been a while since I worked on this side project but I recall making the 5V connection manually.  Since we were doing a PoC we just did the most expedient fix we could.  I wrote the post to make sure I understood the behavior as I found it quite odd.

    Thanks,

    Todd

  • I knew it had been a while. Thanks for the reply, Todd.

    It does seem like an odd omission. I'm curious if it was intended or missed.
  • Might such "curiosity" result in:

    MCU Judge, "Did you pull the trigger?     MCU Suspect, "What trigger?"     (Some questions are "not destined" to be graced w/response...)

  • Of course, you're right. That's why I didn't phrase it as a question. But I should have saved the keystrokes. I hope it didn't come off as a complaint; it's true curiosity about the engineering experience.
  • Jason King said:
    It does seem like an odd omission

    That's dangerously close to a "criticism"-  yet high in diplomacy.   (as past, "Aide-de-camp" - I have some (slight) knowledge of such)

    I believe your issue (likely) resulted from the relative "rarity" of the original poster's (and your) application - and the "crush" upon Engineering to, "Ship that x@#$% board NOW!"   (year's [silent] time passage - as you noted - supports such "rarity."   Take my word for marketing's (likely) push...)

    As the chance of an "accommodating fix" are remote - a real "answer" may prove elusive...

  • Hello Jason,

    Curiosity is true! It will take time to understand why such a decision was made on the power connector header.

    Regards
    Amit
  • Might such curiosity be "better directed" to the far more troublesome, "Default NMI Behavior (rarely sought) inflicted upon PF0/PD7!"