Hello, friends! Need help with connection TCA9548A (100kHz) and 8 x PCF8575 (400 kHz) via i2c bus (need 100 kHz). Vcc 3.3 V. Please tell me what resistor ratings on SDA / SCL / INT are needed and is there anything else needed? I'm try to read datasheets, but my English so bad. Thank you very much!
Hello Aleksey,
What is your expected bus capacitance?
If you are running at 100kHz the required rise time is 1000ns or less.
You can use this document to calculate the resistor based on expected capacitance:
Max bus capacitance allowed is 400pF. Each slave is expected to have 10pF or less.
If you can give me your expected capacitance I could also just calculate this for you....
Thanks,
-Bobby
