Re: Battery for RCM6700

Mario,

We just did the same thing, we added a separate RTC chip to our 
motherboard that should last over 10-years on the battery. On boot-up
I set the Rabbit clock from the off-board clock so I can continue to
use the DC built-in features for time. 

Thanks,
Steve

--- In [email protected], "mario_wtbbh" <mario_wtbbh@...> wrote:
>
> Hey Steve,
> 
> I just noticed this post now.
> 
> We raised the high RCM6700 VBat problem with Digi back in March and this was confirmed as a hardware problem. Initially the fix (new modules) was expected around July, but now they are saying "Christmas". 
> 
> As a back-stop, we added a separate SPI RTC chip that draws about 2uA and are using a 1000mAh battery (Renata CR2477) (with a jumper to VBat) on sites that are usually powered, with short periods on battery.
> 
> I've had to convert all our data storage to flash, with ring buffers to avoid "wearing out" the flash.
> 
> This itself has lots of side-issues (e.g. Needing to mount/dismount the flash to commit the flash table, which lives in battery-backed RAM).
> 
> Regards,
> Mario
> 
> 
> --- In [email protected], "seecwriter" <seecwriter@> 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
> > > >
> > > >
> > > >
> > > >
> > >
> >
>