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+--- Thread: Powered USB HUB [backfeed of RPi] (/thread-723.html)
Powered USB HUB [backfeed of RPi] - serg_as - 31st Mar, 2013 08:01 PM
Hi! Ibought this HUB for my Raspberry Pi. It works, but I found strange thing: When I power off my Raspnerry Pi AC adapter, it (RPi) still gets power from HUB.
Is it normal and HUB should power my RPi?
RE: Powered USB HUB - rikardo1979 - 31st Mar, 2013 08:05 PM
yes, the new versions of RPi can be backfeed from USB ports, so yes this is normal
RE: Powered USB HUB - serg_as - 31st Mar, 2013 08:07 PM
Thanks a lot! And yes, it's new revision with 512 Mb RAM.
RE: Powered USB HUB [backfeed of RPi] - zilexa - 2nd Apr, 2013 10:20 PM
So.. you don't even need to connect the microUSB port of the RPi to this hub? Thats one less cable, would be nice.
Re: Powered USB HUB [backfeed of RPi] - rikardo1979 - 2nd Apr, 2013 10:25 PM
yes,you do not need to connect micro USB to power up RPi as it can be powered from USB ports.but I do not recommend this
RE: Powered USB HUB [backfeed of RPi] - serg_as - 2nd Apr, 2013 10:26 PM
(2nd Apr, 2013 10:20 PM)zilexa Wrote: So.. you don't even need to connect the microUSB port of the RPi to this hub? Thats one less cable, would be nice.
Right, but I'm not sure, that power supply ONLY from HUB will be enough...
Re: RE: Powered USB HUB [backfeed of RPi] - rikardo1979 - 2nd Apr, 2013 10:32 PM
(2nd Apr, 2013 10:26 PM)serg_as Wrote:(2nd Apr, 2013 10:20 PM)zilexa Wrote: So.. you don't even need to connect the microUSB port of the RPi to this hub? Thats one less cable, would be nice.
Right, but I'm not sure, that power supply ONLY from HUB will be enough...
depends on how many mA's can the HUB out on each port.if is less than 900 I would not even try
