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最近在研究BQ40Z50-R2的资料，这个芯片自带电池电压检测的功能，但是看Datasheet中的推荐应用和官网提供的参考设计中都外加了过压保护芯片BQ294700或者BQ296103,这个是什么目的呢，BQ40Z50自己不是有过压保护的功能吗？
