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PCA9518: How to connect EXPSCL and EXPSDA when we don't use it?

Ray Chang
Intellectual 1345 points
Part Number: PCA9518

Hi, Team

If we would like to replace PCA9516 by PCA9518.

If we don't use EXPSCL and EXPSDA on PCA9518, could we float it?

  • 0
    TI__Guru 73181 points

    Hey Ray,

    EXPSCL and EXPSDA should be tied to a pull up resistor. Leaving these pins to float could cause glitches/latches on the main I2C lines if noise were to couple onto these pins.

    Thanks,

    -Bobby