[Gta04-owner] Phoenux drained and resuscitated

Butrus Damaskus butrus.butrus at gmail.com
Sun Oct 23 18:39:26 CEST 2011


Wasn't there some standard which would tell the power management chip
to know that
it has to do with a wall charger by connecting th D+ to D- USB pins?

On Sat, Oct 22, 2011 at 8:12 PM, Christoph Mair
<christoph.mair at gmail.com> wrote:
> Am Samstag, 22. Oktober 2011, 11:16:48 schrieb Neil Jerram:
>> On Sat, 22 Oct 2011 11:58:55 +0200, Dr. H. Nikolaus Schaller wrote:
>> > Hi Neil,
>>
>> Hi Nikolaus,
>>
>> > Yes! Linux initializes the USB charger in one of the earlier steps
>> > and then the system comes up.
>> >
>> > As long as your PC supplies enough current (>500 mA) and you don't
>> > switch on too many high
>> > power consumers (WLAN, WWAN), there should be some remainder for
>> > charging the battery.
>>
>> Well so far I haven't touched WLAN or WWAN, so I presume they're still
>> switched off.  And with the GTA02 it was always said that it could draw
>> 500mA from a USB connection.
>>
>> Presumably, then, with the wall charger - which supplies 1000mA - it
>> will always be possible to recover from a drained battery?
>
> If I understand the problem correctly the wall charger won't help you here,
> because it does not contain an USB host controller. The power management chip
> allows only 70mA to be drained from the USB connection until a valid endpoint
> (host) allows more (up to 500mA). I think the GTA04 does not recognise the
> wall charger as a "special device" which can supply more current.
>
> Best regards,
>  Christoph
>
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