> > > > Gregbert: Interested in the "genuine" qualifier and what is behind it. The > original clock board was put in a box in late 2015 with a CR2032 coin cell > powering the DS3231. When I restarted the project in early 2019, the clock > came up with under 1 minute off Great chip and really long battery life > >> >> There are apparently some fake DS3231/DS3232 ICs out there that have timekeeping problems. So far, I have found 2 different bugs on different modules with the cheap RTC modules bough on Ebay.
- Rollover problem on Dec 31: Date goes to Sept 02 - Accuracy problem: Losing time at the rate of more than 1 minute per day When I use units purchased from Digikey, I have no problems. BTW, this chip averages about 1-2uA current consumption, then every 100 seconds it runs an internal routine that takes a lot more than 50uA; the spike pegs my 50uA mechanical meter. My first few nixie clocks use the AC-line for timing; I do see some day-to-day wandering, and in addition it seems to accumulate a few extra seconds per month. I have a pretty good low-pass filter for the timing-extraction, so it must be low-frequency noise spikes. All of my new clocks use a RasPi for automatic timing, so I have not bothered to trace-down the line-frequency stability. -- 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 neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/b5e4317b-fefa-41f9-9940-f31b3eb08714%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
