Hello,
I bought 6 samples of the ADG728 for switching microcontroller gpio's
I need to use 4 on the same i2cbus addressed as in documentation.
I soldered on bread board adapters properly and properly addressed them with a0,a1 connected to the gnd/+5V
I power them on the same supply as the microcontroller: 5V
I pulled up the scl/sda with different values resistors ranging from 1kR to 4,7kR to 10kR and even without (using internal pull ups of the atmel328pb)
I connected them together on the bus and interrogated them with the standard Wire library
I do not see obvious noise on the bus with the scope and neither i can properly understand why the device is not answering properly to basic connection requests issued by a scanner.
(in the rare conditions when the chips answer i can send and see that the commands are executed )
I can not obtain a reliable connection to all of them ; meaning they sometimes respond they sometimes do not and never consistently... after a while 3 of them dissapear completly from the bus.
What i can do to diagnose and fix this ?
