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Datasheet的page 25有对于这个pin脚的详细描述
9.3.18 Good Battery Monitor The bq2416xx contains a good battery monitor circuit that places the bq2416xx into high-z mode if the battery
voltage is above the BATGD threshold while in DEFAULT mode. This function is used to enable compliance to
the battery charging standard that prevents charging from an un-enumerated USB host while the battery is above
the good battery threshold. If the bq2416xx is in HOST mode, it is assumed that USB host has been enumerated
and the good battery circuit has no effect on charging.
这个pin脚用来检测电池的电压是否大于其判定门限,在default模式,使用BQ24161系列芯片,输入源需要兼容USB作为输入源时才采用。
USB在100ms延迟后枚举所连接的负载的类型,如果没有经过枚举,将BQ24161B置于高阻状态以避免错误的枚举判断。