LTC6820 isolated communication issue

Aishwarya3195 said:

All the remaining connections are according to the datasheet specifications mentioned. But I am unable to transmit or receive signals on IP or IM pins. 

Are you using LTC6820 Demo board?

If not,
Are the bias resistors' values chosen right to configure the transmitter drive current and the comparator voltage threshold? I would suggest using the EVAL Board(DC1941D Evaluation Board) Schematic as a reference to check the connections in your circuit.


Also, ensure your software satisfies the SPI timing requirements for LTC6811(check LT6811 Datasheet Electrical Characteristics Section). For reference, you can use the points summarised in this(Communication issue with LTC6813) Query to debug your issue.