I2C总线扩展设计，I2C是一种较为常用的串行接口标准，具有协议完善、支持芯片较多和占用I/O线少等优点。I2C总线作为PHILIPS公司为有效实现电子器件之间的控制而开发的一种简单的双向两线总线-I2C bus design, I2C is a kind of common serial interface standard, has the perfect support agreement, the advantages of fewer chip more and the occupation of I/O line. The development of I2C bus is used as the PHILIPS for effective control between the electronic devices with a simple two-way two line bus