Unexpected RTC Calibration changes

konay61 · ‎2012-07-23

Posted on July 23, 2012 at 10:38

Hi All,

I'm using STM8L and trying to compensate the RTC in terms of the temperature changes. But the calibration value doesnt effect as the written on the Application Notes and Reference Manual.

For example, when I simply change the calibration value as to +488,5 ppm (the max in 32 sec window), I cant see the expected difference in time. The difference I see is much more less than expected.

I hope to get solution or at least any suggestions to fix it from you..

Thanks in advance,

Best Regards,

Kadir

#rtc-calibration

elil · ‎2012-08-04

Posted on August 04, 2012 at 19:32

So, have you managed to find out the problem? It would be interesting to know...

elil · ‎2012-08-04

Posted on August 04, 2012 at 19:32

So, have you managed to find out the problem? It would be interesting to know...

konay61 · ‎2012-08-07

Posted on August 08, 2012 at 08:36

Hi Yevpator,

Considering the results with different applied values, I calculated a constant to multiply the calib. value of temperature changes. Apparently it worked under all temperatures.

So, when I take 83 % of the calib value, it seems working fine.

Anyways, I could have to find out a better solution to fix that problem later..