DRV8306: DRV8306 EXTERNAL GATE DRIVER CONNECTION VCP SETTING and CHARGE PUMP

Tool/software:

Hello,

Need help.

We use DRV8306 to drive a motor, but we must need to use external GATE-DRIVER (BOOTSTRAP) to drive MOSFET for HIGHSIDE and LOWSIDE. Therefore, we only need to GHA (PIN5), GHB (PIN11), GHC (PIN12), outputting DVDD (3.3V) respect to ground, or no more than 5V. We make SHA (PIN6), SHB (PIN10), SHC (PIN13), tie to ground input. We set I-drive to a lowest level, 15/30 mA, or I-DRIVE (PIN22) tie to GROUND. 

Also, we need GLA (pin7), GLB (pin 9), GLC (pin 14), outputs DVDD (3.3V).

Then, how to connect VDS to what level? So that CHARGE-PUMP outputting a minimum level.