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Science Forum Index » Electronics - Basics Forum » iPod Chargers Question...
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| Talal Itani... |
 Posted: Thu May 22, 2008 9:30 pm |
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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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| PhattyMo... |
| Posted: Thu May 22, 2008 11:09 pm |
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Talal Itani wrote:
Quote: 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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