Re: [Gumstix-users] Overo / Summit / Palo Power management

[R. P. M. <log...@gm...>]

The Overo cannot accept 5V. Range is ~3.2V - 4.6V. I found that the
Overo can start reliably above ~3.2V and once started can run down to
~3.0V without problems. If you can run directly from a single cell Li
battery that would give the best efficiency.

The PMIC manual tells how to power the VBACKUP also.
http://focus.ti.com/docs/prod/folders/print/tps65950.html



On 10/2/09, ro...@ot... <ro...@ot...> wrote:
> Hi,
>
> I'm trying to integrate an Overo Water + Palo 43 + Samsung LCD in an
> embedded project.
>
> Power input is a 2S 5Ah LiPo battery.
>
> I want the system to be completely shut down when not used, with minimum
> current consumption to preserve battery.
>
> The overo will be powered by a 5V 2A pre-regulator that I can disable, but
> I need a trigger from the COM to know when to disable power.
>
> Are SYS_EN or POWERON pins suitable for that, or do I have to use a GPIO
> (then how to set the GPIO hi/low after the system is shut down) ?
>
> Can I power VBACKUP pin to preserve RTC ? At which level 1.8V, 3.3V ?
>
> I'll also need a sort of "sleep" mode, I think the OMAP can handle that
> and need to read more about it before asking questions.
>
> Best regards,
> Thomas Legrand.
>
>
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