--- In [email protected], "rieupinfor" <[EMAIL PROTECTED]> wrote: > > Hi Geert, > Do you put resistors on the SDA and SCL on each i2c circuit on the > bus, or only one pair on the "fox side ?" > Thanks > Best regards >
Hi, It's indeed only one pair of resistors that should be used. Only one device at a time can "communicate" with the master, so only one device at a time will "pull" on the SDA line. That's one. Second, if you would put those resistor pairs on every device, they would be put in parallel one with the other: all pull-up resistors on the SDA line would be put in parallel, same for all pull-up resistors on the SCL line. In the end, almost no resistance would be left over (in the limit, you would nearly short circuit the SDA and SCL lines with the +Vcc line...). And that would not be your intention, wouldn't it? ;-) Best rgds, --Geert
