The switcher power supplies we typically use are the high switching
speed types that only need very small capacitors. Once power starts
falling, the board puts itself in reset. Without large caps in the
power supply, you pretty much have no time to do anything before the
processor goes to reset.
Big caps are high failure components and we try to use as few as
possible. You could cook up a simple external circuit to do what
you want though.
The worst thing you want is for the power outage to happen in the
middle of a flash write. You will likely permanently loose that
sector.
The TS-BAT3 should do what you want though.
//Jesse Off
--- In Jason Stahls <> wrote:
>
> Use NVRAM?
>
> naturalwatt wrote:
> > This is something I haven't been able to find in the TS7250
manual.
> >
> > Is there any warning of a powerfail?
> >
> > I assume there's a few milliseconds between losing the external
12V supply and the
> > processor stopping.
> >
> > If I have a shutdown script that wants to write a very small
file to Flash when the power fails,
> > will it get executed?
> >
> > I'm not going to use a battery and do some complicated sutff, I
am just curious if it is easy or
> > not.
> >
> > There's one value held in memory that I would like to preserve
across (planned or otherwise)
> > reboots, and I don't want to write it to Flash every time it
changes.
> >
> > Martin
> >
> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
>
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