An USB isolator allows get rid of floor loops and minimizes electromagnetic interference (EMI) between the computer and also the related gadget. 1x GND 3V3 (P2 with 2 pins two.54mm) connector can be used to electrical power externally the WCH CH569 MCU (it is recommended to eliminate the P4/SHUNT in https://henryd627kbs2.blogrelation.com/profile