I have an application where I have 8 identical I2C devices that I cannot change the address on. I need to talk to all 8 in sequence and considering a 1:8 MUX. I'm pondering if I need to MUX both the SCL and SDA lines.
If I mux only the SCL line so only the one I'm talking to sees the clock, but all of them see the activity on SDA would the device care.
I wouldn't think so because technically it should "see" the activity on the SDA without a SCL line toggling.
Just wanted to confirm.
thanks
Den mandag den 27. oktober 2014 01.39.36 UTC+1 skrev Mook Johnson:
just get one of these:
-Lasse
The idle chips may feel sick: If you keep SCL at idle state (up) and toggle SDA, the idle chips will see a stream of start and stop conditions.
You may be better off by multiplexing SDA lines and keeping the idle ones up, so the idle chips see plenty of data changes without the start and stop conditions.
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