We use two ADUM1402 to connect 74hc244 and then communicate separately with two groups of 74HC165D chips. The QH(PIN-9) of 74HC165D is connect directely to the AUDM pins. (Attach are the schematics for reference)
The question is that the ADUM1402 chips are broken in some board, even both were damaged sometimes, the chips are hot when do not work. We have to change another chip, then it will work normally again.
The power supply converter used TI-TPS5430DDAR.
Any suggestions would be much appreciated.
Much thanks for your reply.
The Voltage are 3.3V and 5V respectively on each side. I wonder why the chips get broken in some boards and others are work well. We only want to know the reason to avoid the chips damaged. Now the broken chips are increasing.
ADI agents here need the detail report from the third party inspection institution beofre providing service. But it is hard for us as the project is in the stage of development and test. So I have to go to the support community and hope for more support.