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You would need to disable the Watchdog and Enable the ADC. Please read Section 8.3.5, "To enable the ADC, the ADC_EN bit must be set to ‘1’. The ADC is allowed to operate if either the VVBUS>VVBUS_UVLO_RISING or VBAT>VBAT_UVLO_RISING is valid. If no adapter is present, and the VBAT is less than VBAT_UVLO_RISING, the device will not perform an ADC measurement, nor update the ADC read-back values in REG17 through REG24."
