I2C总线（I2C bus，Inter-IC bus）是一个双向的两线连续总线，提供集成电路（ICs）之间的通信线路。I2C总线是一种串行扩展技术，最早由Philips公司推出，广泛应用于电视，录像机和音频设备。I2C总线的意思是“完成集成电路或功能单元之间信息交换的规范或协议”。Philips公司推出的I2C总线采用一条数据线（SDA），加一条时钟线（SCL）来完成数据的传输及外围器件的扩展；对各个节点的寻址是软寻址方式，节省了片选线，标准的寻址字节SLAM为7位，可以寻址127个单元-I2C bus (I2C bus, Inter-IC bus) is a bi-directional two-wire serial bus, providing integrated circuit (ICs) between the communication lines. I2C is a serial bus extension technology, first introduced by Philips, it is widely used in TVs, VCRs and audio equipment. Meaning I2C bus is　between completion of an integrated circuit or functional specification or unit of information exchange agreements.　Philips has introduced the I2C bus uses a data line (SDA), plus a clock line (SCL) to complete the extension data transmission and peripheral devices　addressing each node is soft addressing, saving chip　lines, SLAM is a standard addressing byte 7, 127 units can be addressed