An USB isolator will help reduce ground loops and lessens electromagnetic interference (EMI) in between the computer and also the connected system. 1x GND 3V3 (P2 with two pins two.54mm) connector can be used to electricity externally the WCH CH569 MCU (it is usually recommended to remove the P4/SHUNT in https://hydrabus31974.designi1.com/54393276/hydrabus-an-overview