An USB isolator allows eradicate floor loops and minimizes electromagnetic interference (EMI) amongst the pc as well as the related gadget. 1x GND 3V3 (P2 with 2 pins 2.54mm) connector can be employed to energy externally the WCH CH569 MCU (it is suggested to eliminate the P4/SHUNT in that situation https://jackn161vne7.pennywiki.com/user