nPM1100 charging issue

We found one charging issue on nPM1100, after we assemble the battery to the PCBA, and then apply 5V to nPM110 (VBUS) and GND. The protection ciruit does not release, and I found the VBAT output is only 1.45V (the battery voltage is around 4.15V) . The condiction is same as battery is not detected.
I review the specification of nPM1100, 6.2.1 chagring cycle, it mentioned that:
Battery charging starts after a VBUS connection and the battery is detected.
Base on what condition, nPM1100 determine battery is exist or not.
Is it possible to let nPM1100 always have 4.2V output voltage once VUSB 5V is applied?