[time-nuts] DS3231 a clear winner

Poul-Henning Kamp phk at phk.freebsd.dk
Tue May 3 21:24:57 UTC 2011


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
phk at 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.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: ds3231.gif
Type: application/octet-stream
Size: 9657 bytes
Desc: GIF image data, version 87a, 640 x 480 
URL: <http://febo.com/pipermail/time-nuts_lists.febo.com/attachments/20110503/34153a41/attachment.obj>


More information about the Time-nuts_lists.febo.com mailing list