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BQ24610做的单节电池充电

Other Parts Discussed in Thread: BQ24610

使用BQ24610芯片做的单节电池充电模块,通过设置R1和R2为100K,得到充电电压为4.2V,有几个问题需要咨询。问题一:当接电池的两个引脚在不接电池,悬空时,该两个引脚的电压是多少?问题二:我按BQ24610说明书上面电路做的PCB板,调试,为什么R1和R2之间电压,也就是12引脚VFB的电压是0.4V,不是2.1V?