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PICList Thread
'battery backup for RTC needed'
1999\08\05@121959 by Hickman, Aaron

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To All,

       I am looking for a simple battery backup solution for a project
involving an RTC.  I would like to keep the clock running should power, normally
derived from an AC to DC converter, be interrupted.  I have no experience in
battery charging/backup designs.  Could someone point me in the right direction,
preferably towards a design available on the internet?

Sincerely,

Aaron Hickman

1999\08\05@131756 by John Pfaff

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You could try something like the Dallas DS1287 or 12887 (which have extra
built-in RAM) or the Motorola MC146818.  I know the Dallas parts have a
built-in battery and nonvolatile RAM (spec says it'll last for 10 years
without power), I'm not sure about the Motorola.  They're used in PCs for
configuration storage and RTC.

{Original Message removed}

1999\08\05@141812 by Gabriel Gonzalez

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Just use a DS1302 and a coin-cell battery.

Gabriel

-----Original Message-----
From: Hickman, Aaron <spam_OUTHickmanABTakeThisOuTspamMAIL.VMI.EDU>
To: .....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU <PICLISTspamKILLspamMITVMA.MIT.EDU>
Date: Thursday, August 05, 1999 11:12 AM
Subject: battery backup for RTC needed


>To All,
>
>        I am looking for a simple battery backup solution for a project
>involving an RTC.  I would like to keep the clock running should power,
normally
>derived from an AC to DC converter, be interrupted.  I have no experience
in
>battery charging/backup designs.  Could someone point me in the right
direction,
>preferably towards a design available on the internet?
>
>Sincerely,
>
>Aaron Hickman

1999\08\06@014323 by Martin Mayr

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<x-flowed>Hi Aaron,

what about a SRAM with internal battery backup, like the M48Txx from
SGS-Thomson. This RAM has an internal RTC and is non volatile, because of
the internal battery.



Aaron wrote:
>         I am looking for a simple battery backup solution for a project
>involving an RTC.  I would like to keep the clock running should power,
>normally
>derived from an AC to DC converter, be interrupted.  I have no experience
>in
>battery charging/backup designs.  Could someone point me in the right
>direction,
>preferably towards a design available on the internet?


______________________________________________________
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</x-flowed>

1999\08\06@113958 by Harold Hallikainen

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       Couple of possibilities.  The SGS M48T02 is a TimeKeeper RAM that
has 2 kBytes of RAM, RTC, and battery on the chip (or at least in the
case).  Another possibility is the Dallas or Maxim 1210.  This is a chip
to make SRAM nonvolatile.  It includes power switchover to one or two
batteries and gates the chip select to prevent writes to the chip and to
prevent all your power going out enabled data output lines.

Harold



Harold Hallikainen
.....haroldKILLspamspam.....hallikainen.com
Hallikainen & Friends, Inc.
See the FCC Rules at http://hallikainen.com/FccRules and comments filed
in LPFM proceeding at http://hallikainen.com/lpfm

On Thu, 5 Aug 1999 12:19:33 -0400 "Hickman, Aaron"
<EraseMEHickmanABspam_OUTspamTakeThisOuTMAIL.VMI.EDU> writes:
{Quote hidden}

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1999\08\07@090346 by root

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Hi,

or use the RS5C313 and a CR2032 battery. The former is made by Ricoh. Look
at http://www.ricoh.co.jp/LSI/english

There is a sample schematic, too.

I hope this helps.

Imre


On Thu, 5 Aug 1999, Gabriel Gonzalez wrote:

> Just use a DS1302 and a coin-cell battery.
>
> Gabriel
>
> {Original Message removed}

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