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TMAG5273: Input capacitance for SCL and SDA pins

Kei Kuwahara
Expert 7630 points
Part Number: TMAG5273

Tool/software:

Hello team,

Is there any data for input capacitance for SCL and SDA pins?
My customer would like to know this spec to calculate the pull up resistor value.

Best Regards,
Kei Kuwahara

  • +1
    TI__Prodigy 220 points

    Hello Kei,

    The datasheet does not specifically state the pin capacitance for the SCL and SDA pins however it does refer to  a capacitive load of 50pf in the context of the I2C frequency in section 5.10 in the datasheet.

    I am not sure if this is the pin capacitance plus the I2C bus but should be a good starting point.

    You can also calculate the pin capacitance by measuring the rise time from the I2C line by placing a known resister as the pullup. Doing this would allow you to calculate the capacitance of the SDA/SCL pin and the I2C bus to chose an ideal pullup resistor.

    Regards,

    Chase Girard