The S32K146 12C communication issue (Little sensitive, easy to disturbed by RF or DCDC Switch noise)

[shafers]

Recently, we have a project used the S32K146, we found that the l2C is very sensitive, easy to
disturbed by some noise from onboard DCDC circuit and some offboard RF disturbance.
Can you give some suggestions or design recommendation files to us. How to improve the I2C EMS
compatibility? Thanks.

[shafers]

Hi Lukas,

  Thanks, we will try your suggestion. Here another question. We also found the I2C was disturbed, it can not reset itself(need restart the S32).  This is a very unusual behavior, how to fix or configure it? 

[lukaszadrapa]

Hi @shafers 

here's a nice description of this problem:

https://community.nxp.com/t5/i-MX-Processors/I2C-reset/m-p/253185/highlight/true#M23575

Regards,

Lukas

[lukaszadrapa]

Hi @shafers 

in noisy environment, try to use stronger pull up resistors like 4K7 or even 3K3. Recommended range is usually 3K3 - 10K but 10K may not be enough if noise is a concern.

Regards,

Lukas