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TCA9548A / Can you please resolve the apparent conflict (10K vs 4.7K)regarding R1-R10 in EVM User's Guide?

Jerome Strombosky
Genius 11495 points
Other Parts Discussed in Thread: TCA9548AEVM

Hello,

Can you please resolve the apparent conflict (10K vs 4.7K)regarding R1-R10 in EVM User's Guide?

Regards,

Jerome

 

SLVUA73 the TCA9548AEVM user’s guide shows different Resistor value of R4, R5, R6.  Please advise.

 

 

 

  • 0
    TI__Expert 5140 points

    Hi Jerome,

    Thanks for the question.

    I wanted to bring your attention to this app note : I2C Bus Pullup Resistor Calculation

     


    The pull-up resistor values on the I2C bus can be thought of as a part of RC circuit. Based on the amount of capacitance on the bus and the value of your pull-up resistor you can essentially calculate your pull-up strength  and affect your rise time to VCC. I assume the generic values of 4.7k and 10k were used as these are typical values seen on these bus channels.

    Thanks,

    Siby