Consistency of DCO parameters across multiple samples of a given part number?

I am working on a project that uses MSP430G2452IPW14 (14 pin TSSOP package.)

At initialization, I set MCLK and SMCLK sourced from DCO and set DCO to my chosen clock frequency (I did not rely on Info flash segment D calibration parameters, as those didn't yield the frequency I require.)

I was surprised to find upon building my second prototype of the project that the DCO frequency, using the same parameters as the first prototype, was off considerably (perhaps 5% or so.)

What should I expect in terms of DCO frequency consistency? Should I plan a calibration step for each device I use (i.e., find it's correct parameters to obtain the required frequency?) I do not have a crystal or other primary frequency source in the design -- the DCO is being used stand-alone with no discipline mechanism available.

Thanks,

Dave
[email protected]


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Posted by: David Feldman <[email protected]>
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