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HSI OScillator Accuracy

Question asked by fazzini.michele on Mar 24, 2014
I'm start to using an STM8S105 and i'd like to use the internal HSI oscollator.
Microcontroller datasheet give indication on HSI accuracy using a table where in the worst case with a VDD of 5Vdc we have +/-3% of tolerance maximum in the complete temperature range.
Having a look of the graphics however the tolerance it seems to be greater, till -4% at -40°C.
Moreover the second graphics shows the accuracy for different power supply voltages from 2.9 till 5.5Vdc. Could someone give me an indication about what to consider as worst case without to use any other sw calibration?
thanks in Advance.