I2C（Inter－Integrated Circuit）总线是由PHILIPS公司开发的两线式串行总线，用于连接微控制器及其外围设备。是微电子通信控制领域广泛采用的一种总线标准。它是同步通信的一种特殊形式，具有接口线少，控制方式简单，器件封装形式小，通信速率较高等优点。I2C 总线支持任何IC 生产过程(CMOS、双极性）。通过串行数据（SDA）线和串行时钟 （SCL）线在连接到总线的器件间传递信息。每个器件都有一个唯一的地址识别（无论是微控制器——MCU、LCD 驱动器、存储器或键盘接口），而且都可以作为一个发送器或接收器（由器件的功能决定）。LCD 驱动器只能作为接收器，而存储器则既可以接收又可以发送数据。除了发送器和接收器外，器件在执行数据传输时也可以被看作是主机或从机（见表1）。主机是初始化总线的数据传输并产生允许传输的时钟信号的器件。此时，任何被寻址的器件都被认为是从机。

- Bus is developed by PHILIPS two wire serial bus, used to connect the microcontroller and its peripheral equipment. Is a kind of bus standard, which is widely used in the field of microelectronic communication control. It is a special form of synchronous communication, which has the advantages of less interface line, simpler control mode, less packaging form and higher communication speed. I2C Bus supports any IC production process (CMOS, bipolar). Transfer information between devices connected to the bus through the serial data (SDA) and serial clock (SCL) lines. Each device has a unique address recognition (both micro controller, MCU, LCD driver, memory or keyboard interface), and can be as a transmitter or receiver is determined by the function of the device. The LCD driver can only be used as a receiver, and the memory can receive and send data. In addition to the transmitter and receiver, the device may also be viewed as a host or slave when performing data transmission (see Table