Other Parts Discussed in Thread: PROFIBUS, ISO1452, ISO1432
Hi team
Here customer use ISO1176 in their products, and had below queries need your help:
1.how to select the common mode inductor for differential output and bypass capacitance on BUS? As it affect the signal quality transmission, the speed is 12Mbps
2.What does the termination resistor 390/220ohm used for? As i noticed on our reference design schematic below it has such structure, and customer found that at firstly with 2 nodes on the BUS w/o the termination resistor, it works fine. But with 3 nodes, it faild to communicate. Then add such termination resistor, it returns normal. So what does such structure influence?
3.what is limitation and which decide how many nodes are allowed on the BUS? Should every nodes add termination resisitors?
Best Regards
Gene