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PCA9545

Question asked by Patrick Clapsaddle on Nov 1, 2018
Latest reply on Nov 2, 2018 by Jose Alberto Reyes Morales

I’m testing with the PCA9545.  It supports 0-400Khz I2C bus speed.  It gives a Cb value of 400pF max capacitance for each bus line for Standard-mode and Fast-Mode.  I know my bus capacitance from the mux to the slave devices will be greater than 400pF, so I am planning to run my bus slower than 100Khz, probably in the 10’s of khz.  So does this allow the maximum Cb value to increase for each bus line?  Will this device have any problems with that?

 

Related question, wouldn’t this also allow for a slower rise time?

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