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MSP430G2453: Internal clock source drift due to temperature change

paul mullin
Prodigy 50 points
Part Number: MSP430G2453


Seeing the internal clock drift with temperature - close to the +3% 0-85C specification.  Looking for a cost effective way to compensate drift. 

  • 0
    Guru 34723 points

    If there is need for precise clock source, than external one (XT crystal) should be used.

  • 0
    Prodigy 50 points

    Is there any statistical data available from TI on typical temperature coefficient?  If there is could a software compensation algorithm be used to partially correct the clock based on temperature?

  • 0 in reply to paul mullin
    TI__Guru 56685 points
    Hello Paul,

    The MSp430G2453 and the rest of the G series of MSP430s have calibrated DCO constants written into Info Memory for you to use. You have to use these constants to get the Datasheet numbers you saw. In our code examples for the part we do provide a routine to do your own calibration constants, which you could potentially do at different temps. That being said, even after calibration, these parts are getting around a 3% tolerance depending on the frequency being used. as zrno soli mentioned, if you need more accuracy in your clock, then a LF Xtal is recommended.

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