TELECOM Digest OnLine - Sorted: Re: Why is Motorola USB not Blackberry USB?

Re: Why is Motorola USB not Blackberry USB?

Robin Colleen Moore (
Sat, 30 Dec 2006 07:51:16 GMT

On Fri, 29 Dec 2006 23:01:57 GMT, DevilsPGD wrote:

> In general, the way devices will handle this is to only draw 100 mA
> (which is typically enough to run, but not to charge a battery),
> link up, and once the driver is installed, ask the driver for
> permission, then switch up to the 500 mA (or higher in many cases)
> mode.


This seems to explain why the Motorola RAZR V3 can ONLY charge its
battery on a PC USB cable if the cell phone is turned on with enough
power to run the cell phone.

If the battery is so low that the cell phone can't "ask for
permission", then the usb cable to the PC won't charge the phone.

There must be enough energy left in the battery to power up the phone
so that the phone can ask for permission.

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