Hi, I really like your task and I think I have skills that can assist you. Your application has been submitted.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 case It's not at all required because the 3V3 LDO IC1 is secured versus reverse existing