The baudrate for the RPI can definitely be set in the range of 100-400kHz by editing the /boot/config.txt:
But I haven't yet found any reference to what was the minimum baudrate successfully used.
Further: what is the minimum pullup-resistor that can be used for the RPI4? On page 9 in this datasheet it reads the pullup resistance is tbd but I think it is quite known to be around 1.8k, as reported here.
My questions are:
- What is the lowest I2C baudrate, how do you set it, does it work stable?
- What is the standard I2C pullup resistance?
- What is the limit I can use for adding an external I2C pullup resistance?