nPM1100 is not charging the battery

Hi,

I have a custom nPM1100 borad and want to charge the battery. My schemetic shows here, I notice the battery cannot be charged. My shcemetic shows below:

I have confirmed some things are working:

1. I got 1.8V target at Vout.

2. My Vsys  is 5V.

something confused me is:

1. I cannot charge the battery, the Vbat is 0.

2. I set to Vbus limit to 100 mA mode, but my real current is

3. When the PMIC is not working, if I have an external 1.8V source, whether the chip will broken in reverse voltage?

Thank you for your time!                                                                                                                                                                                                                                                                                            

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