nRF52832

RE: nRF52832

Bendik Heiskel — Fri, 05 Aug 2022 07:57:10 GMT

Hi,

Sorry for the delay.

Are you referring to the GPIO drive strength?

The GPIO drive strength affects the maximum current the SDA and SCL pins can source/sink. If you are using a small pull-up resistor increasing the drive strength could help decrease the data drop.

Best regards,

Bendik

RE: nRF52832

Ysen — Mon, 01 Aug 2022 06:25:15 GMT

One more thing, the data drop will decreas after increase the GPIO driver,Could you share more details of this? I'm not clear with it, Thanks!

RE: nRF52832

Bendik Heiskel — Fri, 29 Jul 2022 10:24:52 GMT

I don't really have a minimum distance, as the voltage of the crosstalk spike is roughly directly proportional to the distance between the traces. Meaning the a doubling of width between the traces will approximately half the voltage spike.

RE: nRF52832

Ysen — Thu, 28 Jul 2022 11:10:14 GMT

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

RE: nRF52832

Bendik Heiskel — Wed, 27 Jul 2022 13:07:11 GMT

[quote user="Ysen"]About the SDA/SCL width and distance, we set all 0.1mm, for this design, is there any risk?[/quote]

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

[quote user="Ysen"]What about your advice of I2C layout?[/quote]

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

RE: nRF52832

Ysen — Wed, 27 Jul 2022 02:24:24 GMT

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!

RE: nRF52832

Bendik Heiskel — Tue, 26 Jul 2022 14:35:18 GMT

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

RE: nRF52832

Ysen — Tue, 26 Jul 2022 08:15:18 GMT

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

RE: nRF52832

Bendik Heiskel — Mon, 25 Jul 2022 13:54:13 GMT

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