Other Parts Discussed in Thread: ISO1410, STRIKE
Hi Team,
ISO3082 is used, Vcc1 is always powered, the right side of ISO3082 is exposed to the outside with a connector and is connected with the other side through cable. That is to say, Vcc2 is not powered and GND2 is float when the other side is not connected through cable.
ESD diodes are connected between A/B and GND2 as shown in the picture below,ISO3082 is broken when there is 8kV air gap discharge near pin A and B when the other side is not connected.
However, when the ESD diodes are connected between A/B and GND1 as shown in the picture below,ISO3082 will not be broken when there is 8kV air gap discharge near pin A and B when the other side is not connected.
It's found that if a capacitor is connected between GND1 and GND2, ISO3082 will not be broken with either connection above. So my questions are:
1. Is it safe to connect a capacitor between GND1 and GND2? If not, any possible risks?
2. Any suggestion for the ESD protection when Vcc2 is not powered and GND2 is float?
Thanks and Best Regards!
Hao