nRF52832

[Ysen]

Hi Nordic engineer

About the I2C SDA signal, when CLK voltage change then the SDA will occur skin needling，could you please helo explain it, I check the PCB latout, the I2C signals line width and SDA/SCL distance is 0.1mm, Its caused by the crosstalk?

[Bendik Heiskel]

Hi ,

We are currently in holiday season in Norway so staffing is low, and response time will be a bit slower then usual, sorry for the inconvenience.

I will update you as soon as I can on your request.

Best regards,
Bendik

[Ysen]

Hi 

Got it,Please give the explaintion and any reason ASAP.Thanks!

[Bendik Heiskel]

Hi again,

 

Based on the provided plot this looks to be caused by capacitive coupling between the SDA and CLK lines on the PCB.

But the spikes does not look large enough to cause a problem for the I2C communication.

 

Best regards,

Bendik

[Ysen]

Hi 

About the SDA/SCL width and distance, we set all 0.1mm, for this design, is there any risk? What about your advice of I2C layout? Thanks!

[Bendik Heiskel]

Ysen said:

About the SDA/SCL width and distance, we set all 0.1mm, for this design, is there any risk?

As long as the spikes on the SDA line don't go under 0.7xVDD then it should not be a problem.

Ysen said:

What about your advice of I2C layout?

To reduce the capacitive coupling between the SDA and SCL lines I recommend increasing the distance between the traces.

[Ysen]

HI

what about the disstance should be compatible？ 1.5 times  line width?