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LSI and HSI accuracy versus temperature and time

Question asked by grandmougin.jean_fra on Oct 15, 2015
Latest reply on Oct 15, 2015 by Clive One
I 'm using a STM32F030C8 and I generate a tick of 1.136ms with the RTC with subseconds alarm.
I calibrate the LSI with the HSI (=8Mhz) but I don't know how LSI and HSI frequencies change when temperature changes.
I need to know this charateristics to evaluate the accuracy of my tick.

I think the accuracy is not enough so perhaps it would be necessary to used a crystal with LSE