EFT protection in I2C lines

[PraveenAmara]

Hi Team,

we are working on EFT testing, we have seen your EFT document

https://www.cypress.com/file/138636/download.

In the document, they have given protection for I2C lines by giving series resistance and Parallel capacitor.

Even though we use lower values. The Pullup voltage will be reduced to 0.1V it's not good in I2C lines.

How can I protect the I2C lines? when we had series resistance it acts as a voltage divider.

so, How can I choose the resistor values?

Thanks

Praveen

[VenkataD_41 · Accepted solution]

Hi,

>>"so, How can I choose the resistor values?"

-->You can go through the following video which explains how to select resistance values on I2C lines.

https://www.youtube.com/watch?v=sGZe0aJsqBQ

>>"The Pullup voltage will be reduced to 0.1V it's not good in I2C lines."

--> This should not happen because the internal drive modes for I2C pins is Open Drain Drives Low.

>>"How can I protect the I2C lines? when we had series resistance it acts as a voltage divider."

-->Please check the pin configuration once again if you modified it. Also we recommed you to place the series resistances after the pull-up resistances.

Thanks

Ganesh