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BQ4050: 预充电MOSFET异常开启?

Part Number: BQ4050

我用BQ4050做了4串电池组,测试时发现:过放保护后PCHG置位。

但是我将Precharge Start Voltage 设成了1.75V(过放保护电压为2.5V),同时PCHG_COMM置1。

所以我想问预充电MOSFET开启条件是什么?  我上面的设置电池电压不可能到1.75V为什么会开启PCHG?