了解stm32,原理图适合初学者，图中还说明了封装类型(Understand stm32To understand STM32, the schematic diagram is suitable for beginners, and the packaging type is also illustrated.)

STM32的各种型号封装，希望有用。PCB设计做做必备东西，好东西(Various models of STM32 package, I hope to be useful)