Re: Battery for RCM6700
"mario_wtbbh" <mario_wtbbh-/[email protected]>
| Newsgroups | gmane.comp.hardware.rabbit-semiconductor |
|---|---|
| Message-ID | <[email protected]> |
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 > > > > > > > > > > > > > > >