So I need a reasoning check, since this is a bit beyond my understanding.
I'm detecting an intermittent issue with the I2C communication between 2 components (PCB level, <10mm apart) in the presence of a strong EM field (freaking phone wireless charger). Components are fine, but I2C rise time is slow. Internal resistor (~28k, no lower value available) is used.
Obviously the value is over the recommended one, but in normal conditions it works fine.
Now this is where I'd like some help - explaining the effect of the charger on the RC value on the bus lines.
I'm guessing since the magnetic field is strong, capacitive coupling becomes significant enough to affects the bus capacitance (increase) and thus tips the rise time to logic high over the edge causing the issue on the I2C lines.
I'm still to play around with the com. speed, playing with pull ups is not possible without HW change, but I'd like to check with you all if my thought process is good or am I talking out of my ass.