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TMAG5273: TMAG5273 I2C Pin Capacitance

Ralph Stucki
Prodigy 40 points
Part Number: TMAG5273

Hello

I miss specifications about the pin capacitances on the I2C interface.
This to calculate the needed pull-up resistors according to the document SLVA689.

Thanks a lot
Ralph

  • 0
    TI__Mastermind 23045 points

    Hello Ralph,

    Thanks for posting to the PS forum! The datasheet does not clearly state the pin capacitance but when states the I2C frequency it does state the capacitive load as 50pF. Not sure if this is the pin capacitance plus the rest of the I2C bus but it might be a good starting point for your calculation.

    Another thing to note is that you could possibly also calculate this value by measuring the rise time from the I2C line by placing a known resistor as the pullup, since you have a known steady state voltage you could theoretically calculate the capacitance of the pin as well as your I2C bus to chose an ideal pullup resistor value.

    Best,

    Isaac

  • 0 in reply to Isaac Lara
    Prodigy 40 points

    Hello Isaac
    Sorry, I did not see this line.
    This is sufficient for the first determination of the pull-up.
    Best regards
    Ralph