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omapl137 without the 1.8V supply

Levone
Prodigy 180 points
Other Parts Discussed in Thread: OMAP-L137, TMS320C6747

Could I don't power the 1.8V  supply if I don't  use the USBs? And omapl137 with all the peripherals(except for USB)  runs well without the 1.8V power ? 

  • 0
    TI__Guru 64480 points

    Levone said:

    Could I don't power the 1.8V  supply if I don't  use the USBs? And omapl137 with all the peripherals(except for USB)  runs well without the 1.8V power ? 

    Yes, you can leave the USB power pins unconnected if you are not using the USB interfaces.

    Please take a look at the following post.  It discusses how to treat the unused USB interfaces of the TMS320C6747, and it is applicable to the OMAP-L137.

  • 0 in reply to BrandonAzbell
    Prodigy 180 points

    The post you recommended is useful.Also I want to check that whether the Pins we don't use could be all leave "unconnect"  or need PD with a resistance?which one is better for omapl137

  • 0 in reply to Levone
    TI__Guru 64480 points

    Levone said:

    Also I want to check that whether the Pins we don't use could be all leave "unconnect"  or need PD with a resistance?which one is better for omapl137

    Reviewing the OMAP-L137 datasheet, nearly all I/O pins of the device have either an internal pulldown or pullup.  Generally, these are not strong pulldowns or pullups, but if you do not have any connection, nor any trace on the board, to these pins, the internal pulldown and pullup would be sufficient.

    However, if you do have a trace on these pins, an external pulldown or pullup (in the same direction) would be suggested.