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MSP430I2040: Overall DCO drift over time

Munan Xu
Expert 4175 points
Part Number: MSP430I2040

Hello,

I have a customer trying to spec UART clock drift over time on the MSP430I2040. Do we have a spec on the overall accuracy of the clock over time, or should we just use the maximum absolute tolerance spec in the datasheet?

Munan

  • 0
    TI__Guru 60361 points

    Hi Munan,

    There is no spec for drift over time.  I would just refer the customer to the max tolerance.  I assume they would be using external resistor to help control DCO accuracy.

  • 0 in reply to Dennis Lehman
    TI__Expert 4175 points

    Hey Dennis,

    Ok, thanks for the feedback, we need to take into account the voltage and temperature drifts if using the max tolerance, or is that already figured into the overall max?

    Munan

  • 0 in reply to Munan Xu
    TI__Guru 60361 points

    Unless noted otherwise, the specifications in the data sheet are typically over recommended ranges of supply voltage and operating free-air temperature.  Here is an example.

    Here is an example where they show drift and accuracy based changes in temp or changes in voltage or both

    So although we don't show drift over time, you can see the %drift due to temp or voltage or both.  If the customer is worried about baud rate accuracy over time, use and external resistor with the 50-ppm TCR or better and that will keep the accuracy of the clock well within the tolerances of the UART.  Make sense?

  • 0 in reply to Dennis Lehman
    TI__Guru 60361 points

    Hi Munan,

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