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看BQ24040的规格书发现，写明30V 输入额定电压；带有 6.6V 的输入过压 保护，怎么说输入可以到30V，有写明6.6V的输入过压保护，这个不是很矛盾吗？
PG引脚在芯片正常工作是常亮还是常闭？哪些异常会引起PG的电平变化？
