An USB isolator aids reduce ground loops and lessens electromagnetic interference (EMI) between the computer as well as connected product. 1x GND 3V3 (P2 with 2 pins two.54mm) connector can be used to electricity externally the WCH CH569 MCU (it is suggested to remove the P4/SHUNT in that scenario It https://hydrabus18495.dreamyblogs.com/33517375/hydrabus-for-dummies