An USB isolator allows get rid of floor loops and lessens electromagnetic interference (EMI) among the computer and the connected product. 1x GND 3V3 (P2 with 2 pins 2.54mm) connector can be used to electrical power externally the WCH CH569 MCU (it is recommended to eliminate the P4/SHUNT in that https://miriamc727ldu3.wikissl.com/user