USB Power Output
Posted: 26 Jul 2018, 21:23
What is the maximum USB Power output for the 2 ports? I am trying to drive an 7" LCD display and having the power off of the USB port it only flickers.
If you want to operate the waveshare 7" on a RevPi Core 3 you need to use an external powered USB hub because we have restricted the USB ports of a RevPi Core 3 to the 500 mA maximum current defined by USB norm.
On a RevPi Connect you can draw up to 1 A from a single USB port but only 1 A in sum for both USB ports together (this is a violation of the USB norm but we've recognized that many vendors are violating the rule, e.g. waveshare or several GSM stick vendors). Please note that you could have simply answered your question by looking on the side printing of the case or the spec sheet ("Shop" or "Project" section). We have limited resources to run this forum and thus I would kindly ask you to search such information on these resources before posting in the forum.