Re: OLinuXino, a serious Rasberry Pi competitor?

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#270

From: Jan Panteltje
Date: Sat, 10 Mar 2012 08:33

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On a sunny day (Fri, 09 Mar 2012 20:14:36 GMT) it happened nico@puntnl.niks
(Nico Coesel) wrote in <4f5a5f28.4013572062@news.kpn.nl>:

>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.

Well, mine crapped out at a much lower current.
It is just that ignoring specs that makes that strawberry pudding a request
for disaster.

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From: Jan Panteltje <pNaonStpealmtje@yahoo.com>
Newsgroups: sci.electronics.design,aus.electronics,comp.arch.embedded
Subject: Re: OLinuXino, a serious Rasberry Pi competitor?
Date: Sat, 10 Mar 2012 08:33:54 GMT
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