AnsweredAssumed Answered

ADuM1251 issue on I2C application

Question asked by Keven.Chen@wpi-group.com on Mar 3, 2014
Latest reply on Mar 28, 2014 by MSCantrell

Hello,

 

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?

Thanks.

 

 

B.R.,

Keven

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