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BQ24780S充电芯片问题

您好!关于BQ24780学习模式问题,芯片的Battery LEARN Cycle是通过完全放电来学习电池电量,学习模式在什么情况下用?我看了数据手册如果在学习模式下放电学习如果电压达到Battery Depletion Threshold后会自动调至适配器充电。是不是如果想知道电池是否过放就必须在学习模式下?