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BQ77915: 电池欠压保护,应该单节电池低于3v才保护,但现在电池电压到3.2v就保护了

Part Number: BQ77915


 五节电池串联放电,应该15v才保护,但是现在16v就欠压保护了(单节3.2v)此时没有任何一节电池低于3v,无论是使用电池放电还是用电源模拟电池放电,都在电压到16v时保护,请问是什么问题?