I2C 总线实际上已经成为一个国际标准在超过100 种不同的IC 上实现而且得到超过50 家公司的许可但是现在的很多应用要求总线速度更高电源电压更低-I2C bus has actually become an international standard on more than 100 different types of IC and got more than 50 companies licensed but many applications require higher bus speeds lower supply voltage