Re: [Gumstix-users] Power supplies

[Chad R. <cr...@lu...>]

Dave Hylands wrote:
> Hi Chad,
> 
> On 11/6/06, Chad Robinson <cr...@lu...> wrote:
>> Is it OK to feed my own VCC to the Audiostix2 and thus to the Gumstix
>> via one (or more) of the exposed VCC pins? I want to make an LCD
>> interface for a project that runs off 12V, and it seems like the best
>> thing to do here would be to make a daughter board that plugs into the
>> Audiostix2 headers and supplies the power and LCD connectors.
> 
> Sorry, the MIC5219 on the audiostix2 board only provides power for
> that board, and not any other boards. Each board has its own voltage
> regulators on it. So you really need to provide voltage to V_BATT,
> which does run through all of the boards. V_BATT needs to be around
> 3.45v or higher (3.3v + 150 mV dropout for the voltage regulator).

VBATT doesn't seem to be exposed on any AudioStix2 headers, so supplying 
it externally would be tricky. Since VCC doesn't go to the Hirose 
connector, what would be the best way to get around this? I suppose I 
could short VBATT to VCC on the board, and desolder the MIC5219, but I'd 
rather avoid that. Any ideas?

Thanks,
Chad