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SM72441: 在什么情况下这款芯片的第11引脚(LED)会有一个脉冲输出

Part Number: SM72441

芯片数据手册上的引脚说明显示芯片的第11引脚会有一个输出脉冲,在通电测试时没有检测到这个输出脉冲,请问怎么样才能检测到这个输出脉冲?