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BQ27Z746: BQ27Z746保护板

Part Number: BQ27Z746

4.2V锂电池设置的欠压保护为2.9V,当达到欠压保护以后(欠压保护软硬件机制都设置了),电池仍然会给主板供电,此时电压不足以使得主板采集数据,但是主板上的电源指示灯还亮(亮度没有原来亮),麻烦问一下这是什么原因造成的呢