本模块的核心部分是由一片14位双通道串行接口乘法数模转换器DAC8802芯片组成的程控放大和衰减部分，这部分中的DAC8802芯片通过内部SSI总线与STM32F103ZET6内部的SPI实现通信，由STM32F103ZET6经SPI传输的CODE值决定放大或者衰减的幅值(The core part of this module is composed of a piece of 14 dual-channel serial interface multiplication DAC8802 d/

STM32F103ZET6与RIFID模块连接，读取卡号(STM32F103ZET6 and RIFID module connection, read card number)