An USB isolator can help reduce floor loops and lessens electromagnetic interference (EMI) among the pc and also the related gadget. 1x GND 3V3 (P2 with two pins 2.54mm) connector may be used to power externally the WCH CH569 MCU (it is suggested to eliminate the P4/SHUNT in that case https://aesopg839phy4.yomoblog.com/profile