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BQ24031: BQ24031 Regulation Current and Regulation Voltage conversion

Part Number: BQ24031

hi 

I have a problem with BQ24031 chip. it's two processes for charging, constant current  and constant voltage. However, the datasheet does not mention how many volts will be charged in the constant current and then transferred to constant pressure.In my product application, during the fast charging process, the current will decrease as the voltage rises to 3.85V during the constant current phase.  From the chip datasheet, the current starts to decrease at 4.1 volts. But, in my design ,the current starts to decrease at 3.85 volts.Why? This chip, the constant current conversion is changed to a constant voltage state, and the battery voltage value will be? I need some help.Thank you .jinxing.wang