首先介绍I2C总线的的一些基本知识：特点、结构、原理、控制时序、与单片机的接口方法等。最后通过一个实例实现模拟I2C接口。-First of all I2C bus introduce some basic knowledge of: characteristics, structure, principle, control timing, and MCU interface methods. Finally, through an example of analog implementation I2C interface.