design: side2 cpu side, 3.3v, side 1 isolated psu control ic i2c interface, 3.3v -2
issue: no ack from slave of side 2, waveform seems good.
If add a 100pf to Gnd at data input at side2, the interface works good.
Or If add a 1nf to 3.3 v at data input at side2, the interface works good.
But I can not under the root cause, could you help.