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MSPM0G5187: VUSB33 Pin When USB Feature Unused

Stuart Baker
Genius 10810 points

Part Number: MSPM0G5187

I'm working with a customer planning to use the MSPM0G5187 device for its NPU AI accelerator capability. The design does not have USB in it. They will be utilizing the Standby0 or Standby1 mode, and want to ensure lowest possible current consumption in these modes.

It is unclear from the documentation what the hardware configuration of the VUSB33 pin should be when the USB feature is unused. Should it be:

  • Unconnected?
  • Pulled up or down?
  • Connected to VDD (nominal 3.3V)?
  • Something else?

Thanks,

Stuart

  • +1
    TI__Expert 8031 points

    Hi Stuart,

    If the customer does not want to use the GPIOs at all, they can fully disconnect VUSB33

    If they want to use the GPIOs for general behaviors (like toggle H/L, operate UART, or whatever is IOMUXed to that pin) -> they need to connect VUSB33 and keep it within reasonable range (like 1.62V-3.63V IIRC)

    If they want to use the GPIOs for USB specifically (they need to connect VUSB33 to 3.3V supply +/- 10% tolerance)

    There is an errata that is currently being handled that does change some things, however. For lowest power consumption normally, they wouldn't need to do anything specific - could be connected/disconnected/etc... The errata in development states that you have to disconnect it if VDD is unpowered, or if VDD is powered but device is in shutdown mode.

    Best,

    Owen