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Plugging both USB and VIN simultaneously

Topic last updated 29 Apr 2012, by Luis Linares. 1 reply
Luis Linares
29 Apr 2012

Hello all,

I am in the process of embedding an mbed to a final design, in which the mbed will be powered by a 5.0V source through VIN. That connection is hard-wired in the mbed's host PCB. It will work standalone, but then I wondered, What if for some purpose somebody needs to plug the USB port of the mbed? Isn't there going to be some sort of "supply contention"?

I checked on the reference design, but besides the 3V3 LDO regulator, there is no display of how exactly is USB power routed to the LDO.

Thanks!

Luis Linares
29 Apr 2012

Never mind, I just learned the full mbed schematics are in a different file than the LPC1768 reference design. Thanks!