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Article #244Re: OLinuXino, a serious Rasberry Pi competitor?
From: Arlet Ottens
Date: Fri, 09 Mar 2012 17:22
Date: Fri, 09 Mar 2012 17:22
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3073 bytes
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 devices that require more than 100 mA, the configuration is only done after the host first reads the current requirement, and has determined that it can still supply it. For instance, a 4 port bus-powered USB hub can only support 4 devices if they have a max 100 mA requirement. Cell phone/battery chargers with a USB type plug are not limited to those currents, and can typically supply more.
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Date: Fri, 09 Mar 2012 18:22:28 +0100
From: Arlet Ottens <usenet+5@c-scape.nl>
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Subject: Re: OLinuXino, a serious Rasberry Pi competitor?
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