Long term accuracy of the calibrated RC.

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Does anyone have some info how the calibrated RC change over time ?

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The internal Oscillator or ???

/Bingo

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yes the internal

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Afaik it varies a lot with temperature changes , and maybe even with the voltage supplied.

Use search in top of the forum page , you will find a lot of info.

/Bingo

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There are variations in the specs for diffrent devices, so read the data on the device you wish to use. If I remember correctly the mega48/88/168 have the better spec.

Keep it simple it will not bite as hard

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No I mean over time not temp or volt.