Hello community,
I have bought a PCF85363 and am in the process of testing it.
Unfortunately it is running 3 seconds ahead per day.
I have tried different settings to adjust the clock. Unfortunately no success. I have also attached capacitors (33pf and 47pF) to the quartz. No success either.
At the beginning the clock ran behind, but now it always runs ahead.
What am I doing wrong?
Yours sincerely
Patrick Dreger
Standard clock quartz, 32.768kHz with 12.5 load capacity.
Hello Thomas,
I know that you can do offset calibration. I just wanted to avoid it.
It could have been to trick with additional capacitors.
And one more thing. This is the best 1Hz clock I have measured with oscillator. No 0.9Hz. Stable 1Hz.
Hello,
I use clock quartz with 12.5pF.
I have tried all the configurations. I have even changed the quartz.
Hello Patrick,
What crystal are you using? Is it a 6pF, 7pF or 12,5pF load capacitance crystal? Did you set the load capacitance bits accordingly?
It is possible to perform offset calibration as described in the datasheet, section 7.8.3.
You can also find some useful info in the UM10301, sections 9 and 10.
BRs, Tomas