Battery ID chip - help needed
yorickmoko at gmail.com
Wed Jun 10 23:08:08 CEST 2009
FR ca nalso charge at 1A
(with wall charger)
On Wed, Jun 10, 2009 at 11:04 PM, Christian
Gagneraud<cgagneraud at techworks.ie> wrote:
> Risto H. Kurppa wrote:
>> On Wed, Jun 10, 2009 at 9:56 PM, Christoph Pulster<openmoko at pulster.de> wrote:
>>> Openmoko, please can you release relevant infos or chips, so we can
>>> built high-power batteries ?
> According to the schematics of the FR, the ID line of the battery is
> not connected to anything (R1769 is marked NC). I checked my FR rev A6
> (from your shop Christoph!;)), and this resistor is not populated.
> So it means the ID line of the battery is definitely not used.
> Now I'm not saying it is safe to use whatever battery, i'm just saying
> that the power management chip (the PCF 50633) is not able to read any
> information out of the battery you fit in your FR (like battery ID,
> serial number, etc...).
> I would say that as long as you use a 3.7V single-cell Li-ion battery
> that has built-in protection, it should be safe to test with your FR.
> The only drawback you'll get is a longer charging time.
> The FR is designed/programmed to charge at 500mA max. It should be
> possible to change the charging rate in software (u-boot and/or
> kernel), or perhaps by doing some HW mods.
> I'm not a battery expert, complementary information welcome!
> According to the FR battery page , they say that FR use a smart
> battery (model number CT-GTA02 ) but i can tell you that i don't
> have such a thing in my phone, i actually have a battery marked
> "Model: GTA02", which is definitely not a smart battery (it has only 3
> pins), this battery correspond more to what's describe on the Neo
> battery page . Moreover, the schematics of the FR show that it use
> only 2 signals of the battery: V+ and V-.
>  http://wiki.openmoko.org/wiki/Neo_FreeRunner_Battery
>  http://people.openmoko.org/tony_tu/GTA02/hardware/GTA02/CT-GTA02.pdf
>  http://wiki.openmoko.org/wiki/Neo1973_Battery
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