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I2C Problem

Question asked by mohsen haghighat on Dec 28, 2016
Latest reply on Dec 30, 2016 by ufedor

Hello,

We design a Backplane system with PCA9548A I2C switch,  In this design, the I2C switch multiplex I2C between cards. when write 0x00 in register 0 of PCA9548A, and output I2C ports are disable, the I2C signal is OK!

But when wite 0xff in resister 0 of PCA9548A, and output I2C ports are enable, the I2C signal is not OK because the low level of the signal come to 0.7 volt. What can I do to overcome this problem?

I attach I2C signal Image, whan all ports are enable and all ports are disable.

thanks

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