RE: Re: Battery for RCM6700

We use a super capacitor to provide the clock battery voltage, it is
recharged when the unit is powered up and saves us having to worry about
battery replacements.

 

Brian

 

From: [email protected] [mailto:[email protected]] On
Behalf Of Moore, Robert
Sent: Thursday, August 16, 2012 5:13 PM
To: [email protected]
Subject: Re: [rabbit-semi] Re: Battery for RCM6700

 

  

I haven't calculated the life for your hardware. In my app using the OP7200
and the battery I mentioned I calculated the life at > 15 years. My real
intent was to keep the end user from ever opening the instrument.

 

bob

 

On Thu, Aug 16, 2012 at 7:45 PM, Phil D <[email protected]> wrote:



I do recall the manual saying something about cycling the power to get
better RTC current draw performance, 

5 years is a long time to want the RTC to survive is a rechargeable 3V not
an option is it realistic that the product will be un-powered for this
period and require the correct time? as this is a network device NTC may be
a possibility to explore

I use a 3V lithium ion that i calculated as 72 days RTC time which is
suitable for my application as real time isn't essential

 

Phil

On 16 August 2012 20:39, Moore, Robert <[email protected]> wrote:

  

I noticed somewhere in the 6700 manual a REQUIREMENT that you cycle power to
the 6700 AFTER attaching the battery. This affects  the drain on the battery
. . .

 

bob

On Thu, Aug 16, 2012 at 1:45 PM, seecwriter <seecwriter-/[email protected]> wrote:

That's not a bad choice. But it's half the capacity I need for a
5-year life, unless I'm over thinking this.

We may have to go to a separate time-of-day clock device that uses
far less current than the RCM6700's 120ua in order to get the life
span we want with a reasonable size battery.

Steve

--- In [email protected], "Moore, Robert" <robert_moore@...>
wrote:
>
> On the OP7200 I used a AA 3.6 VDC lithium battery (Saft LS14500CBA or
> equivalent) accessible from the outside of the instrument case using a
> Bulgin 122-BX0011/1 . . .   I'm assuming the RCM6700 has the same pinout
> for this.  My biggest concern was to keep the end-user from opening the
> instrument.
>
> bob
> --
> Robert K Moore, PhD
> Designer, Macular Metrics
> Robert_Moore@...
> 401-226-6888
>
>
>
>
> On Thu, Aug 16, 2012 at 12:31 PM, seecwriter <seecwriter@...> wrote:
>
> > The battery current draw for the RCM6700 seems rather high, requiring a
> > large battery to maintain the clock for 5-years.
> > Can anything be done to reduce the battery current? I'm just rying to
> > maintain the time-of-clock.
> > What have others done for a battery?
> >
> > Steve
> >
> >
> >
> > ------------------------------------
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
>





------------------------------------

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-- 
Robert K Moore, PhD
Designer, Macular Metrics

[email protected]
401-226-6888

 

 




-- 
Robert K Moore, PhD
Designer, Macular Metrics
[email protected]
401-226-6888