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Thread: USB power in parallel
face picon face BY : Jinx email (remove spam text)

> Ignoring that, many USB ports just can't supply the full 500mA.
> Laptops are bad for that, but also any unpowered hub can't supply
> 500mA per port since it gets it's power from one port

I'm not au fait with USB power standards now, but as explained in
the Silicon Chip article of 10/04 -

"Each USB socket of a PC or self-powered USB hub can supply up
to 500mA at 5VDC ...... Many low-cost USB hubs are also designed
to take their own power from the PC via their "upstream" USB cable...
..things start to get a little more complicated if you try to connect a
number of bus-powered peripherals to your PC via such a hub, because
the hub's "downstream" output sockets can each supply only 100mA
max. That's because all of their power must ultimately come from the

<037001c8dd81$247cfdb0$89aafea9@ivp1> 7bit

See also: www.piclist.com/techref/power.htm?key=power
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