Hello,
We have 7 I2C multiplexers PCA9548A on the I2C bus in our design. Apart from these muxes, there are 6 other devices. We are able to access all the devices except the muxes. None of the muxes is responding and we can clearly see NACK in the scope shots. There is a single 2k pull up on the input side on the I2C bus. There is no additional capacitance on the input SDA/SCL lines. The rise time, set up time and hold time on the input side look okay as per the device datasheet specs. I don't see any problem with the input drive signal. I am confused as to why the muxes aren't responding.
Pls advise what else I should look for.
Thanks
Shruti
