Power supply for FCDEV3B

[Serg l]

I can 3D print a frame which will hold the board and the battery in desired
position. I made a simple frame for FCDEV3B to hold it in place on the
bench while PCB is not touching anything on the surface.

We can also have a surrogate connector ripped off a real battery and a
small frame folding it connected to the spring pins on PCB.

I have C155 and C123 to experiment with if anybody is interested.

On Mon, May 8, 2017 at 11:41 AM, Mychaela Falconia <
mychaela.falconia at gmail.com> wrote:

> Hi DS,
>
> > To use it
> > with either DP-L10 or C1xx, I removed the lithium part of the battery,
> > and connected the GND and power to where the lithium battery was.
> > This way the phones believes there is an actual battery connected.
> > Alternatively, I believe since the communication is I2C, one could
> > use a microcontroller for the purpose of feeding the appropriate info.
>
> There is no intelligence in Motorola or Pirelli batteries (they are
> called "dumb" batteries unlike the one Openmoko made for GTA02), and
> certainly no I2C.  Instead there is a thermistor inside the battery
> pack connected between the third pin and GND, and nothing more.
> Openmoko's GTA02 battery has HDQ on the third pin to communicate with
> the "fuel gauge" chip instead of the original thermistor.
>
> Instead the real difficulty with connecting a power supply instead of
> a battery to a phone (as opposed to a board like our FCDEV3B made
> specifically for development), or connecting either a power supply or
> a real battery to a bare phone PCBA without the plastic case, is
> mechanical - making a reliable, low-resistance and potentially high
> current connection to the battery connector on the phone PCBA.
>
> I may have a need at some point to connect either a power supply or a
> real battery (either option would be equally acceptable) to bare (no
> plastic case) GTA02 and Pirelli motherboards, and I haven't found a
> good solution yet.  But this need is not immediate, just potential at
> this point.
>
> M~
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