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Sci.Electronics.Basics -> iPod Chargers Question
There are 3 messages in this thread.
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Author: Talal ItaniDate: 22:30 22-05-08
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Why is it that some USB chargers cannot charge the Apple iPods? I tested
multiple USB charges, and only those that say "for iPods" work.
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Author: PhattyMoDate: 00:09 23-05-08
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Talal Itani wrote:
> Why is it that some USB chargers cannot charge the Apple iPods? I tested
> multiple USB charges, and only those that say "for iPods" work.
>
>
There's some tricks..
Some older iPods will work on any USB (+5V) source..others require that
the D+ and D- pins in the USB plug are tied high,or low through a ~10K
resistor (i don't remember the exact details)..and yet newer models,like
the 2nd-gen Nano I have here won't charge with any type of "dumb" USB
port. It needs an actual USB host to negotiate power requirements
with... no host,no negotiation,no charge.
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Author: DaveDate: 10:33 23-05-08
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"PhattyMo" <phattymo@not.net> wrote in message
news:4836434d$0$87064$815e3792@news.qwest.net...
> Talal Itani wrote:
>> Why is it that some USB chargers cannot charge the Apple iPods? I tested
>> multiple USB charges, and only those that say "for iPods" work.
>
>
> There's some tricks..
> Some older iPods will work on any USB (+5V) source..others require that
> the D+ and D- pins in the USB plug are tied high,or low through a ~10K
> resistor (i don't remember the exact details)..and yet newer models,like
> the 2nd-gen Nano I have here won't charge with any type of "dumb" USB
> port. It needs an actual USB host to negotiate power requirements with...
> no host,no negotiation,no charge.
Interesting. I wondered the same thing about my Blackberry phone... I can
plug it in to a computer's USB port, but unless there is BB device manager
software installed on that machine, I get "insufficient charging voltage
available" although I can still access the device as a removable device,
i.e. I can do everything but charge it.
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