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shutdown引脚就是当器件不使用的时候,可以将器件disable,进入低功耗状态,输出为高阻抗,高有效,此引脚电平为高的时候,输出disable,当为低的时候,器件保持正常工作,如果不用此功能的话,可将此引脚直接接在负压轨上-Vcc上。