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STM32F411CEx RTC drift with LSI RC clock

Question asked by Laxminarayan Mishra on Apr 5, 2017
Latest reply on Apr 5, 2017 by Clive One

Hi,

We are using STM32 internal RTC with 32.768 KHz LSI RC clock. We are observing very large drift in time(Approx 3min lag in 1 Hour).

We have gone through the RTC calibration application note.But that requires manual measurement of LSI clock deviation or external source to calculate LSI deviation.

Is there any other way to auto-calibrate RTC?

How much accuracy we can achieve with calibration?

Please suggest if any existing example code is there for STM32F4 RTC calibration.

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