D D DC 3.0V 2G4 Filtering Cirucit Keyboard C Cirucit C U1 IC 2G4 Power Supply Coding (Embeded 2G4) Cirucit B A Crystal 16 MHz B Title Size A Number A4 Date: File: 25-Aug-2022 Sheet of E:\kevin20210830\PCB资料\上景PCB.