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IIC信号为什么要加上拉电阻
IIC是一个两线串行通信总线，包含一个SCL信号和SDA信号，SCL是时钟信号，从主设备发出，SDA是数据信号，是一个双向的，设备发送数据和接收数据都是通过SDA信号， 在设计IIC信号电路的时候我们会在SCL和SDA上加一个上拉电阻
模块电路设计讲解27/28
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