Dunno, but regarding to my earlier post, accuracy seems to be pretty good in long term scale. It may fluctuate more than 2 ppm on a single day, but overall stability seems to be far more better instead of extrapolating the drift based on per one day. RTC is near of my window and I’ll open it pretty regularly. I haven’t studied how much temperature fluctuations will affect to the total accuracy. 10 secs sounds still kinda a large drift. May that be some kind of EMI related issue of your circuitry? High SPI-frequency and continuously polling may generate some extra pulses to the clock source. At least INT-pin was affected by SPI-data when scoping of my case.
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