I mentioned recently that I was playing with a DS3231 and was quite impressed. It's leaving my lab now, so I thought I'd update you on the results.
I'm running it with a 1F supercap and a 3V lithium coincell as backup. The supercal takes care of the first 9-10 days, after which the coincell takes over. But what impresses me most is the frequency, check the attached graph. (At day 11 I changed the "aging" register from zero to 16.) I cannot tell how much of the frequency slope is due to initial aging, and how much is due to voltage, but either way this chip seems able to stick well inside a 1PPM band at practically no power. Highly recommended. Poul-Henning -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.
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