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MSP430G2553: DCO drift / tolerance

Jan Kesten
Expert 1610 points
Part Number: MSP430G2553
Other Parts Discussed in Thread: MSP430FR2532

Hi,

I am looking for some information about DCO stability in MSP devices in general. For example, the mentioned MSP430G2553 has stated in the datasheet that the tolerance for the calibrated values overall (Vcc and temperature drift) are typical +/-3%. So far so good. 

In my case, I 'calibrate' the DCO using a software FLL from the watch crystal running at 32kHz which is working fine. Are there any details out there how stable the DCO itself is - especially about temperature drift?

Thanks for any pointers,

Jan 

  • 0
    TI__Genius 10980 points
    Hi Jan,

    Could you please clarify what more information you are looking for? As you stated, the datasheet lists the tolerance (which in this case gives the stability that you can expect), including temperature drift. You can also see the device's User's Guide for more information on how the DCO works.

    Regards,
    Nathan
  • 0 in reply to Nathan Siegel
    Expert 1610 points
    Hi Nathan,

    I found some drift information about the VLO in the datasheet - but only full range ratings for the DCO.

    My particular question is how stable the DCO can be considered while running with only minor temperature and supply voltage changes.

    I 'calibrate' the DCO from my watch crystal as a software FLL once and I am interested how good the DCO can keep this frequency. Maybe I need to make some tests myself :)

    Of course with a redesign to newer devices the hardware FFL (msp430fr2532 lists -0.5 ... 0.5% for a DCO running at 16MHz) whill make this obsolete.

    Jan

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