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DA8568芯片设置成下电高阻状态



请问,使用DA8568芯片,设置成下电高阻状态时,芯片引脚直连外部12V电源,连接多路引脚时,为什么会烧芯片。且芯片引脚接1K电阻到外部12V电源时,在芯片引脚侧测得的电压为5.8V左右,高阻状态不应该是12V吗?急!!!万分感谢!