Other Parts Discussed in Thread: ISO1044, ISO1042
Hello,
We use ISO1050DW transceivers on out PCBs for CAN communication. I wanted some insight on what would have to happen internally on the IC for the CANH/CANL pins to get shorted to GND pin on the transceiver IC. Also, we took the transceiver ICs off of the board to inspect which GND pin was getting shorted to the CANH/CANL pins on the IC, we found that pin10 was the one getting shorted with CANH/CANL on the transceiver.
We have 15 nodes on our CAN network and each node uses a ISO1050DW transceiver for CAN communication. Recently, we have seen that the CANH and/or CANL pins on the transceivers on some of the nodes get shorted to the ground pin on the transceiver after continuous operation for a few hours bringing the whole communication network down. On some transceivers, it is not necessarily shorted, but the resistance is very low. On a good transceiver, we see a resistance of around 7 Mega Ohms. On the faulty transceivers we see resistances in Kilo Ohm range or shorts (very low resistance like 10-100 Ohms). We tried to understand reasons as to why this would happen. The working temperature of each node never goes outside the recommended temperature range for ISO1050DW. We don't see this problem on a huge number of transceivers, but we are seeing it more than we would like to.