Hi Geert, I was not meaning the pullup resistors, but the damping (100ohms) ones. One for each circuit on the i2c bus (in serie to get from the circuits SDA pin (or SCL) to the bus line), or one for the entire bus (on the fox side, before the bus)?. Thanks
--- In [email protected], "Geert Vancompernolle" <[EMAIL PROTECTED]> wrote: > > --- In [email protected], "rieupinfor" <rieupinfor@> 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 >
