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What's the internal resistor accuracy for the MSP432

Hi Dung,

What's the internal resistor accuracy for the MSP432? The reason is that If we can't get the 0.1%, 25ppm external DCOR, would it possible we use a 0.5% or 1% DCOR and still better than using the internal resistor.

  • Hi Louis,

    Resistor accuracy will get directly added to the time period accuracy. For ex DCO accuracy is specified assuming Ext R has 0% tolerance, lets say its X%.

    Time period is prop to RC product. Hence Y% tolerance in R will directly come out at DCO and DCO will have X+Y % accuracy.

    In other words, we can say that while this is not specified, R accuracy is additive to overall DCO accuracy.

    Hopefully this helps.

    David
  • Hi David,

    Thanks for the reply. The reason that I ask this is because customer don't have a 0.1% 91K resister. So we would like to know what result we would expect if we use a 0.5%? 0.2% resistor, is it linear compared to 0.1%.

    Thanks.
  • Hi Louis,

    Yes that should be the case. In general, we can say that while this is not specified, R accuracy is additive to overall DCO accuracy. So if external R is 0.1% + X% therefore DCO accuracy is datasheet spec + X%.

    Regards,

    David

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