On Sonntag, 18. Juli 2021 04:06:56 CEST Tim S wrote: > I did want to pose the question, are you aware of the existence > of DS1341/DS1342 RTCs? These parts have a 1pps (or power-line 50/60Hzr > following built-in.
On these chips the PPS alignment is done by selecting an edge from a 128Hz division of the XTAL input, which is always completely free-running. This results in a skew window of almost 8ms on the PPS pulse and large deviations in holdover. So while I can see them working very well for a different application, that's not what I was looking for. The DS3231M can be tuned from the datasheet value of ±5ppm or about half a second per day to around 15ms/day holdover. I have one module lying around that I set up a year ago and then disconnected to let it run on battery. Based on the experience with the active one over that same year (which you've seen the plots of) I think it should still be within 30s when I eventually connect it again, which would be absolutely amazing considering the price of these modules. Regards, Achim. -- +<[Q+ Matrix-12 WAVE#46+305 Neuron microQkb Andromeda XTk Blofeld]>+ Factory and User Sound Singles for Waldorf Q+, Q and microQ: http://Synth.Stromeko.net/Downloads.html#WaldorfSounds _______________________________________________ time-nuts mailing list -- [email protected] -- To unsubscribe send an email to [email protected] To unsubscribe, go to and follow the instructions there.
