On Wed, 7 Oct 1998, Leonard Silva de Oliveira wrote:
> > > SRAM = Static-RAM , doesn't need any power to keep data, but only to change
> > > the stored bit value. I'm sure you can find lot of information about SRAM
> > > (AFAIK called FLASH in some commercial products) functionning.
> > >
> > > if I'm wrong, I hope to receive a copy of the correct information ;-)
> >
> > Ok, so, you're wrong! SRAM needs power to keep data. Probably you're
> > talking about DRAM, whose current exists when the stored bit change. But
> > DRAM keeps data in its internal capacitances, and how things aren't
> > perfect, there's also some internal resistances, that drains slowly the
> > electrical charge of the bits. So, it's necessary a refresh to recharge
> > each bit-cell of DRAM.
>
> DRAM ? Even worse ! D-RAM needs refresh circuit , a address demux
> circuit
> and wastes a lot of power .....
Right, but not so much. Each DRAM bit unit contains only one transistor
(MOSFET), and each SRAM bit unit contains 6 (SIX) transistors! So, there
are 5 more capacitances to be charged and discharged when a bit is
changed, so the power consumptions is much higher in SRAM's.
> About the FM-PAC SRAM ... It isn�t a CR2032 type. It is a BR2325
> (Rechargeable)
> And below it there is a watchdog circuit with diodes wich recarges it.
After this, I'll come back to home and open my FMPAC cartridge, because
I'm sure that the battery is a standard lithium battery.
> It�s impossible to a CR2032 lasts more than 5 years ... it discharges
> itself
> though it�s internal resistance + S-RAM consumption.
Then, why my watch was never opened? It's 7 years old!!! Certainly it uses
a CR2032 lithium battery.
> So don�t worry about changing your�s FM-PAC battery !
So, I have another problem. My FMPAC is stored in the locked for more than
1 year. Can this battery be discharged now?
[]'s
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Marco Antonio Simon Dal Poz http://www.lsi.usp.br/~mdalpoz
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