I don't know about firmware but I do use the CR2032. The super cap would work too but an uncharged cap look like a short circuit.
On Fri, Mar 13, 2015 at 1:33 PM, Pete Stephenson <[email protected]> wrote: > Hi all, > > > 2. The two Oncores I purchased were not factory-equipped with a > rechargeable battery. The user guide says that one can apply "Externally > applied backup power (< +5V)" to pin #1 in order to maintain data in RAM > in case the main power is interrupted. > > Can one use a common non-rechargeable coin-cell battery like a CR2032 to > provide this backup power, or does it need to be a rechargeable battery? > Will a CR2032 or the Oncore itself be damaged if such a cell is used? > > 3. Tom says at > <http://lists.ntp.org/pipermail/questions/2012-October/034001.html> that > in addition to being an input for external backup power, pin #1 on the > Oncore provides current-limited 5V for battery/supercapacitor charging. > > Is this true for Oncore receivers that were not factory-equipped with a > rechargeable battery? If true, what is the maximum current that can be > safely supplied by the pin? As above, is it safe to use a > non-rechargeable battery like a CR2032? > > If pin #1 can supply power and I wanted to charge a supercapacitor from > that pin, would I also need to include a current-limiting resistor to > prevent the Oncore from sourcing too much current? > > I could find nothing in the user guide that says that pin #1 can be used > for charging a battery. > < > http://www.synergy-gps.com/images/stories/ShopTalk/9backup_battery_considerations.pdf > > > is unclear on whether or not pin #1 can be used for charging batteries, > or if it's safe to use non-rechargeable cells like a CR2032 coin-cell > battery. > 4. The user manual and the battery backup considerations document says > that the Oncore UT+ draws 5-100 uA (15uA typical) from the backup power > source. Is this a constant draw, even when the main 5V power is being > supplied to the unit, or does the unit only draw current from the > battery when the main power is interrupted? > > I'd measure it directly, but none of my multimeters are able to > accurately measure microamperes. > > Thank you all for your time and assistance. If any other time-nuts > happen to make it to Bern, Switzerland in the next few years, please let > me know and drinks are on me. > > Cheers! > -Pete > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > -- Chris Albertson Redondo Beach, California _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
