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STM32F373 RTC is accurate with VBAT but not when power is on

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DCajigal
Associate III

‎2021-05-26 10:49 PM

The RTC looses 15 min every 8 hour aprox when the main power is on. I have selected the LSE as the RTC clock, as i show in the images, and i have a 32.768 Khz 10 ppm crystal with a 9 pF load. I thought that maybe it was due to a bad match of the crystal capacitors but the RTC works fine when the main power is off! I really dont know what is going on... Thanks in advance.0693W00000APw2yQAD.png0693W00000APw2tQAD.png0693W00000APw2jQAD.png

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DCajigal
Associate III

‎2021-06-07 11:41 PM

In the end it really seems like a hardware problem. The MCO output is not stable when i turn on or off some peripherals...So i will try to be more careful with the RTC in the next design and see if the problem dissapears. Thanks for the help

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Freedom_Neo
Senior
In response to DCajigal

‎2022-03-29 03:22 AM

Dear @DCajigal​ I have same problem. How did you solved this problem?

https://community.st.com/s/question/0D53W00001ScZorSAF/internal-rtc-clock-lag-issue

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