Atmega328P provides logic signals to the AQH1213 solid-state relay to control AC load (contactor).
Task: Protect the Atmega328P in case the solid-state relay fails and supplies high voltage to the low voltage part. Although the technical data sheet shows insulation up to 5000 volts, I would like to provide additional protection measures.
What I use now: - TVS diode (600W) between the relay control line and ground. Theoretically, if suddenly 220 V falls on a low voltage circuit, the TVS diode turns off, the 220 V fuse blows, and the microcontroller does not receive a high voltage.
What I found: - Digital isolator. Example: TI ISO7220ADR
The datasheet says about using separate power supplies (VCC1 / GND1 and VCC2 / GND2). I have one line with a voltage of 5V on the board.
Question: Will the digital isolator work if I use one power line on both sides?