BQ24707: Setting the output charge regulation voltage is not as expected

Part Number:BQ24707

Hello guys,

I can communicate through SMBUS: ChargeCurrent() = 1A. write ChargerVoltage() = ~8.4V, with power supply set to 20V, but the BAT voltage is still 20V.

I want to decrease the BAT voltage to 8.4V.

I wish someone could help me to try to find the problem.

Thanks!