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 USB Power 
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Joined: Thu Aug 27, 2009 7:37 pm
Posts: 3
Post USB Power
How much current can I take out from the USB ports? Is there any different at the ports in the front/rear?

Thax in adv.


Wed Dec 16, 2009 8:40 am
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Joined: Mon Mar 16, 2009 2:11 pm
Posts: 2339
Post Re: USB Power
You should be able to draw 0.5A per port.
Rear ports are reported to be marginally more tolerant to higher current draw.

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Irad Stavi
fit-PC forum admin

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Wed Dec 16, 2009 8:57 am
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Joined: Fri Sep 02, 2011 8:58 am
Posts: 2
Post Re: USB Power
Hi

I need to pull 0.5A from two ports, run a touchscreen monitor on a 3rd. For power usage - do I add all of these requirements to the nominal 10W power use of the CPU. Also with so much current being drawn - should I run my 2 x 0.5A devices off a separate 5V supply (I have the option)

Thanks


Fri Sep 02, 2011 9:19 am
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Joined: Mon Mar 16, 2009 2:11 pm
Posts: 2339
Post Re: USB Power
Total current consumption from all USB ports should not exceed 1.5A.
So if you have the option to power the devices from an external source it is recommended.

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Irad Stavi
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Sun Sep 04, 2011 6:30 am
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Joined: Tue Jan 24, 2012 4:43 pm
Posts: 1
Post Re: USB Power
Regarding the limit on the current draw (1.5 A) through all the USB ports, is there any overall protection? As I read somewhere, each USB has a current limiter of 500 mA but that translates to 2 A of collective draw from 4 USB ports (FitPC2).

I am a bit concerned as two MIMO Touch 2 screens are powered by 4 USB ports. According the MIMO specs, each screen draws from 0.6 A to 1 A; 1.2 A to 2 A for two screens. The shipped supply of FitPC2 could not handle this current draw and thus I replaced that with another 12 V power adaptor (5 A).

Things are working fine now and PC is not freezing. Is it safe to do this way? Am I stressing the supply of FitPC2 that may lead to premature failure?


Tue Jan 24, 2012 4:58 pm
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Joined: Thu Jun 02, 2011 1:13 pm
Posts: 1260
Post Re: USB Power
The FitPC2 designed with a safety margins for an overcurrent situation, but operating in such mode highly unrecommended and may lead to a faster hardware wear, so I recommend to use an external power source on your setup.

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Gabriel Heifets

Fit-PC2/3/IntensePC support.


Fri Jan 27, 2012 9:06 am
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