简要介绍了串行用户接口I2C 总线,它具有接口简单、易于控制和可靠性高等特点。 智能化振动测试仪中应用I2C 总线技术,大大减小了体积,提高了仪器的整体可靠性。对于不具有I2C 总线接口的单片微处理器,可利用它的I/O 口来模拟实现。 Abstract: The I2C bus was briefly introduced. It was provided with the simply interface, easy control and high credibility. Because of applied the technique of I2C bus, the intelligent vibration measurement instrument was deduced to small size. Meantime, the high credibility of the instrument was acquired. For single chip processor without I2C bus, it was available to use CPU's I/O. Key words: I2C bus; vibration measurement; single chip processor