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Problem of ADUM1411-Low Level rise to >1V when 3 ADUM1411 was connected to MCU

Question asked by Alex_Liu on May 22, 2017
Latest reply on May 30, 2017 by yuanyh

I came across a problem when testing ADUM1411.

 

Every ADUM1411 connect to MCU will make the low level voltage in Vin Din of MCU (connect to VIC pin of ADUM1411) rise (The high level voltage maintain 5V). 

 

When I connect 1 / 2 / 3 ADUM1411 to MCU, the low level will rise to 0.3 / 0.9 / >1 V. And then MCU could not recognize the low level voltage.

 

Below I show the schematic diagram & timing diagram when 0/1/2/3 ADUM1411 is connected to the MCU. Tks for your help!

 

 schematic diagram

 

No ADUM1411 was connected to MCU

0 ADUM1411 connected

 

One ADUM1411 was connected to MCU

1 ADUM1411 Connected

 

Two ADUM1411 was connected to MCU

2 ADUM1411 Connected

 

Three ADUM1411 was connected to MCU

3 ADUM1411 Connected

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