I use ADuM1251 on our system.
When I bypass ADuM1251, the i2c works look fine, please see "ADuM1251_Bypass.jpg".
But when I add it on my i2c bus, the ACK signal will drift on both sides, please see "ADuM1251_primary.jpg" and "ADuM1251_secondary.jpg".
H/W condiction as below.
pull up resistor: 3.3K ohm
VDD1=VDD2=3.3V (different power source, each bypass capacitors = 0.1uF)
Can you give some suggest?