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LAUNCHXL-F28379D: the "+5V" pins and "+3.3V" pins

Junfei Tang
Intellectual 315 points
Part Number: LAUNCHXL-F28379D
Other Parts Discussed in Thread: TMS320F28379D

One questions:

From "TMS320F28379D LaunchPad Quick Start Guide", we see that there are "+5V" pins and "+3.3V" pins.

We want to ask if it means that

  • the LaunchPad can be powered by these pins if it works without connection to a computer though USB

or

  • the LaunchPad can provide "+5V" and "+3.3V" to other devices if the LaunchPad is connected to a computer though USB?
  • 0
    Guru 30330 points
    Junfei,

    It depends on the configuration of the various jumpers on the board. Please review the schematic for this information. There are a few different ways that the board can be powered.

    The short answer to your questions is, Yes. The LaunchPad can be powered through these pins without connection through USB. And The Launchpad can also provide +5V and +3.3V to other devices if the launchpad is connected to a computer through USB. You will be limited by the amount of current the USB can supply.

    If supplying power to the device side, and the USB cable is plugged in, Ensure that JP1, JP2, and JP3 are disconnected, otherwise there will be contention between the 5V from the USB and the 5V from device side.

    I will be working on updating the User Guide to describe the different power domains so this is more clear.
  • 0 in reply to Mark Labbato
    Guru 30330 points
    Junfei,

    Did my post satisfy your question? Please let me know if you have any followup questions.
  • 0 in reply to Mark Labbato
    Intellectual 315 points
    Hi Mark,

    Thank you very much for your reply!

    According to your answer, we have decided to put a 5 V power supply on our PCB in order to provide the launchpad with 5 V. We will monitor the registers in the MCU from CCS on a PC, and therefore, the MCU will be connected to the PC and the 5 V power supply at the same time. We will then follow your comments to ensure that JP1, JP2, and JP3 are disconnected during the test.

    The PCB along with the programming may be finished in the summer, and after we have tested it, I will add my feedback here.

    Thank you again!

    Sincerely,

    Junfei Tang
  • 0 in reply to Junfei Tang
    Guru 30330 points

    Awesome. I am looking forward to seeing your update! If you come across any additional questions. Do not hesitate to create a new post!