This thread has been locked.
If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
Tool/software:
Hi Team,
My customer is considering to use ISO1640-Q1 for isolated I2C, it will connect to external I2C device. Could you please share the guideline for the connector and cable selection?
Thanks!
Ethan Wen
There is no standard for I²C cables/connectors because I²C was designed for short distances on a single board.
I²C has a limit of 400 pF for the total bus capacitance, and even that reduces the maximum achievable speed. So you cannot use connectors or cables that increase the capacitance too much.
I²C has no error checking mechanism, and single-ended signals are sensitive to noise. In noisy environments, you have to use shielded cables, which increase capacitance.
Hi Clemens,
Thanks!
Do you think if ISO01640-Q1 is suitable for off-board communication? Do you know if we have such use-case experience from other accounts?
Ethan Wen
Hello Ethan,
Clemens is correct, I²C is intended for short distances on the same board and as a result there are no official cable or connector recommendations in our datasheets. The transceiver and I²C team also confirmed that they haven't made any official recommendations regarding component selection.
Off board communication is okay for ISO1640 side 2 as long as the bus capacitance with the connector and cable are kept below 400pF limit stated in the datasheet.
Best,
Andrew