Re: OLinuXino, a serious Rasberry Pi competitor?

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#254

From: Nico Coesel
Date: Fri, 09 Mar 2012 20:14

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Arlet Ottens <usenet+5@c-scape.nl> wrote:

>On 03/09/2012 06:07 PM, Jan Panteltje wrote:
>> On a sunny day (Fri, 09 Mar 2012 13:26:09 GMT) it happened nico@puntnl.niks
>> (Nico Coesel) wrote in<4f5a042f.3990283062@news.kpn.nl>:
>>
>>>> I made a little 9-20V to +5 V switcher with USB connector to charge a real Chinese mediaplayer I have,
>>>> that because I have plenty 12V wall warts.
>>>> Adds an other 5$ at least even if DIY.
>>>
>>> You know about Dealextreme.com? You probably could have saved some
>>> money and clear some space by throwing the 12V wall warts away :-).
>>
>> Oh, I forgot to mention WHY I did the separate charger...
>> The PC USB port would switch itself off because of too much current,
>> IIRC it is only 600mA in the spec? Not sure.
>> If the strawberry pie is indeed 700mA that will promise a whole
>> lot of fun on a whole lot of peesees.
>
>The USB 2.0 spec only allows for 500 mA maximum current after the device 
>has been configured. Unconfigured devices are only allowed 100 mA. For 

Sorry, but that is pure theory. In reality 99% of the PCs will happily
deliver >1A through their USB port. Current regulation circuitry and
controlling it adds extra costs and customers might think their PC is
broken because the devices are not working or are not getting charged.
Manufacturers want to avoid that extra hassle.

I just tested a USB port of my PC with a dummy load and it supplies
over 1A without a device attached.

-- 
Failure does not prove something is impossible, failure simply
indicates you are not using the right tools...
nico@nctdevpuntnl (punt=.)
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From: nico@puntnl.niks (Nico Coesel)
Newsgroups: sci.electronics.design,aus.electronics,comp.arch.embedded
Subject: Re: OLinuXino, a serious Rasberry Pi competitor?
Date: Fri, 09 Mar 2012 20:14:36 GMT
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