Thanks! I was not aware of that. I'm using a variety of supercaps bought from Digikey and on ebay. I didn't pay much attention to that part of the circuit or the values of the supercaps, but I was surprised to find that one clock had the correct time when not powered for about two weeks.
On Wednesday, February 24, 2016 at 3:24:26 PM UTC-5, gregebert wrote: > > Nice clock! > > Curious about the capacitor you used for sustaining the DS3231 RTC during > power-outages because there is a periodic temperature-compensation cycle > every 64 seconds that takes a spike in current. Datasheet says about 600uA > for up to 200msec, so each of those will take a bite out of your capacitor. > If I did my math correctly, a 1000uF cap will drop around 120mV after each > cycle. > > In my case, I was monitoring standby current of my wristwatch (nominally < > 2uA) with a 50uA mechanical meter, and the temp-comp cycle pegged the meter. > > > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/2892057e-e7ac-42d0-ba16-e232c35a4e7b%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
