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INA226: I2C minimum clock rate

Steve Neuharth
Prodigy 20 points

Part Number: INA226

Is the INA226 minimum I2C clock rate really 1kHz as shown in Table 3 of the datasheet?  Note (1) is pretty vague.   

  • 0
    TI__Mastermind 32395 points
    Hey Steve,

    Thanks for coming to the forum to address this question.

    The minimum I2C clock rate is an input specification. This mean that slowest the clock rate (controlled by master) that the INA226 can work with is 1kHz. Note (1) is clarifying that we do not test the I2C bus timing specs during production as we do for many of the specs in the electrical characteristics (EC) table. Thus, they cannot be guaranteed in the same way that we control for max and min specs in EC table (Section 6.5).

    So to answer your question, the minimum I2C clock rate should be 1kHz. There will be some margin based upon the statistical analysis mentioned in Note (1), but running the clock rate at frequency just higher than 1kHz will provide best robustness.

    Sincerely,
    Peter Iliya
    Current Sensing Application
  • 0 in reply to Peter Iliya
    TI__Mastermind 32395 points
    Hey Steve,

    I do want to confirm that there is high confidence in the maximum and minimum specs of the timing table because it is a mature process that we can simulate to get theoretical limits. Once we characterize according to Note (1) we can add even more margin.

    Hope this helps and since you have not responded back I will mark this post as resolved, but if you have more questions please post back.

    Sincerely,
    Peter