文章描述了48针LQFP/TQFP封装的PCB布局及引脚连接情况,包括VDD、XTO、RST、D+、D-、USB电源总线等金属垫及其相关元器件（如电容、电感）的连接方式,以及PCB上的5金属垫行式接头配置。 2025-7-21 03:20:6 Author: www.reddit.com(查看原文) 阅读量:21 收藏
This is very challenging. I've searched for a while.
Package: 48‑pin LQFP/TQFP
Pin 1 is connected to a metal pad that says VDD (also pin 1 is decoupled) with capacitor whose other end is connected to ground
Pin 5 is connected to a metal pad that says XTO
pin 20 is connected to metal pad that says RST(decoupled with capacitor whose other end is connected to ground
pin 27 is connected to capacitor decoupled , inductor seriesed D+
pin 28 is connected to capacitor decoupled, inductor seriesed D- pin 37 is connected to capacitor decoupled V power BUS of USB Pin 38 is tied to ground (GND) pin 47 connected to a metal pad that says DAT
pin 48 connected to a metal pad that says CLK On the PCB board, there is a 5-metal pad row header DAT,CLK,VDD,GND,XTO
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