• State Answer Suggested
  • Locked Locked
  • Replies 5 replies
  • Answers 1 answer
  • Subscribers 31 subscribers
  • Views 5483 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

How to use and external power source to power EK-TM4C123GXL

michael whatley
Prodigy 60 points

Other Parts Discussed in Thread: EK-TM4C123GXL

Hello,

I am planning to power my EK-TM4C123GXL externally and I am trying to find information on how to achieve this goal.

I have looked through the user manual and data sheet and was unable to find much information other than a power management schematic.

I was wondering if someone could point me in the right direction to figure out how to properly achieve this goal.

thanks for your time,

Michael

  • 0
    Guru 86865 points

    Here below from Tiva Launchpad User's Guide.

    Power Supplies
    The Tiva C Series LaunchPad can be powered from one of two power sources:
    • On-board ICDI USB cable (Debug, Default)
    • USB device cable (Device)
    The POWER SELECT switch (SW3) is used to select one of the two power sources. Select only one
    source at a time.

    There is also VBUS Socket at bottom left of Tiva Launchpad. See, post below.

    - kel

    post edited  . . .

  • 0
    Guru 117855 points

    What's usually important when powering such boards externally is NOT causing conflict w/board's 3V3 Voltage Regulator.   (such results when you apply 3V3 externally)

    Instead - after your review of the board's schematic - (if memory serves) you may introduce 5V0 onto header pin labeled "VBus."   (Left header, top-most, inner pin - Gnd then is just beneath that pin - creating a simple, 2 pin connection)

    As always - after confirming those connections w/board's schematic - employ a lab supply (first adjusted to 5V0) and current limited (~50mA).

    Schematic should also reveal the best setting of the board's power switch (top/left) of this board.   (I recall "Debug" working for us...)

  • 0 in reply to Markel Robregado
    Prodigy 60 points
    Hello Kel,
    Thanks for the reply.
    I saw that in the user manual as well and that is what confused me.
    Those connection options appear to go back to the usb connections on the board and I would like to power the MCU without usb cables. Rather a control power voltage (like a 5 volt supply). the MCU will be mounted on a robot navigating a maze.

    I looked at the Power management schematic and it shows a pin (on J3) labeled Vbus. I am assuming this can be used, however I am trying to confirm. also I know the board has its own built in 3.3 volt regulator that is fed by Vbus, i just wanted to fully understand this approach.

    thanks for your time,
    Michael
  • 0 in reply to michael whatley
    Guru 117855 points

    michael whatley said:
    Power management schematic and it shows a pin (on J3) labeled Vbus.

    Our posts crossed - believe you've found your answer - note that Gnd appears one pin down on that same J3.

  • 0 in reply to cb1_mobile
    Prodigy 60 points
    hello cb1,

    you are correct lol.

    yes i believe that i have a plan for now.

    thanks for the guidance gentlemen