5G will not charge from wall adapter

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5G will not charge from wall adapter

My new 15 gig 5G will not charge from a 5 volt wall adapter.It charges fine on the USB port on my computers.
So I decided to take a USB extension and cut it an place a current meter in series with the 5 Volt on the USB line.What I found is that it will draw ~500ma with the data lines connected in the cable(in other words a normal cable). Now if I disconnect the data wires so that I am only connecting the 5 volts from the USB port it will draw ~100 ma for a second and then draw no current.It appears that some kind of handshaking is required. Is this normal?
As it is now I will not be able to ever charge it from a 5 volt supply.Do they do something to the data lines on wall adapters?

Windows XP

Posted on Feb 6, 2006 2:21 PM

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Answer 1

btabz

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Feb 6, 2006 2:22 PM in response to radarshop

What type of iPod do you have? The only 15GB iPods were earlier than 4G iPods. 1G, 2G, and 3G iPods do not charge from USB ports.

That brings up the question...
Which iPod Do You Have?

btabz

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Answer 2

radarshop Author

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Feb 6, 2006 2:24 PM in response to radarshop

Sorry I meant 30 gig. It is a 5G video.

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Answer 3

btabz

Level 7

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Feb 6, 2006 2:26 PM in response to radarshop

The iPod will only charge from a normal USB port or USB Power adapter.

btabz

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Answer 4

radarshop Author

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Feb 6, 2006 2:34 PM in response to btabz

I have a usb power adapter.It is not made by apple but is 5 volts 1 amp. It supplies the 5 volts on the proper USB pins on the connector.The data connection(the two middle ones are not connected to anything). Are the data lines (for handshaking) required for charging? It will not also charge on a USB port on a computer unless the data lines are connected?

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Answer 5

radarshop Author

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Feb 6, 2006 3:30 PM in response to radarshop

Does anyone know if the middle two connections of the USB connector on a apple 5G wall adapter are connected to anything in the charger? These are the data lines normally.

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Answer 6

radarshop Author

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Feb 17, 2006 7:49 AM in response to radarshop

I have determined it must use the data lines. I have tried 2 5G ipods on 3 different usb 5 volt wall adapters and no charging. Got a 12 volt charger that uses the firewire lines and charges fine. The proper apple 5 volt wall adapter must be using the USB data lines.

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Answer 7

Apr 25, 2006 5:43 PM in response to radarshop

I believe the issue is that these "dumb" USB power adapters really just supply power and don't communicate with the 5G to tell it they are able to supply "USB high power" (500mA max) not just the 100mA default maximum. In other words the 5G is following the USB Specification: Low Bus Power devices take all their power from the bus, but no more than 100mA at a time. High-power, bus-powered devices can draw up to 500mA after they are configured by host system software, but must not draw more than 100mA until they are configured (USB Specification, Version 1.1, Section 7.2.1).

I have read that early 5G firmware did not have this issue leading me to believe Apple could someday provide a help full firmware update that allows the 5G to draw Full Power if it does not get an answer when it asks the AC adapter how much it can supply.

Meanwhile the only way I have found to begin the 5G charge cycle with any third party USB power Adapter (AC or Auto) is to force a full reset of the iPod WHILE CONNECTED.

Dell Latitude Windows XP Pro iPod 5G

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Answer 8

Apr 25, 2006 6:21 PM in response to radarshop

I have a new 5G 30Gig Video iPod. I was disappointed to find out that my iMac G5 won’t charge the new iPod when it (iMac) is sleeping. I believe this is due to the USB 2.0 port. My old 3G iPod (firewire) charged when the iMac was awake or sleeping. However, I my 5G iPod does charge just fine on the 3G’s dock plugged into the wall (110 VAC) with it’s firewire power adapter. -jv

5G iPod iMac G5 G4 PowerBook G4 iBook 1Gig Shuffle Mac OS X (10.4.5)

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Answer 9

-Dre-

Level 4

1,156 points

Apr 25, 2006 6:22 PM in response to JV Vandergrift

Please create your own topic 🙂

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Answer 10

Apr 26, 2006 4:49 PM in response to -Dre-

Dre....I was responding to the initial post....my 5G ipod does charge from the wall adapter...seems related to "5G will not charge from wall adapter"?
Cheers

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Answer 11

-Dre-

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Apr 26, 2006 4:50 PM in response to JV Vandergrift

Sorry. I just read the first sentence of your post and thought that you were still having a problem.

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Answer 12

May 25, 2006 9:20 PM in response to radarshop

Well I finally got my "dumb" USB charger (a Belkin F8Z009 Power pack) to work with my iPod 5G 30GB. To wake up the 5G needs to see 2.5 volts on it's data lines. The easiest way to do this is with a voltage divider made with two equal resistors. Like this:

As a poof of concept I made the device below with four 30K resistors but anything from 10K to 50K should work fine.

A more compact wake up cable could be made by cutting into a standard USB male-female extension cable and soldering in four resistors like this:

Of course if your building your own or can get your "dumb" USB charger open then the resistor voltage dividers can go inside.

Dell Latitude Windows XP Pro iPod 5G

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