An USB isolator allows remove floor loops and decreases electromagnetic interference (EMI) between the pc as well as connected product. 1x GND 3V3 (P2 with 2 pins two.54mm) connector can be employed to energy externally the WCH CH569 MCU (it is suggested to eliminate the P4/SHUNT in that situation It's https://janetl050sia5.blogmazing.com/profile