I am using some SC16IS750 via I2C protocol. The SC16IS750 is addressed by using A1 and A0 pins as shown below. However, I can only use 4 cases (VDD-VDD, VDD-VSS, VSS-VDD, VSS-VSS). When one of the SC16IS750 that has A1 or A0 pin connected to SCL/SDA, then it cannot detect that address and also affact other SC16IS750.
So, how to fix this problem ?
Thank you for you consideration !