The Register Settings that i have followed for the bellow required conditions;
input values to the charger:15V/2.4A;
expecting output settings :14.3V/1.5A;

battery settings 3S battery/with BQ76920;
prochot pin is left unused,this is to charge only battery without system...
1:ChargeOption0() 0x020E;
2:ChargeCurrent() 0x0600;
3:MaxChargeVoltage() 0X3800;
4:ChargeOption1() 0X0210;
5:ChargeOption2() 0X02B7;
6:ChargeOption3() 0X0000;
7:ProchotOption0() 0X4A54;
8:ProchotOption1() 0X8120;
9:ADCOption() 0X00FF;
10:OTGVoltage() 0X0000;
11:OTGCurrent() 0X0000;
12:InputVoltage() 0x3C00;
13:MinSystemVoltage() 0X2400;
14:IIN_HOST() 0X3000;