We have a exernal LDO ( VBUS to 3.3V ) to connect to CCG3's VSYS pin.
In a dead battery condition, then the internal LDO is turned on and the VDDD is supplied by VBUS.
after CCG3 power - on, how to disable internal LDO?
Please disable the LDO with this register:
* 20V regulator enable signal
* "1" : Enable regulator to output supply onto VDDD
* "0" : Disable regulator
#define PDSS_VREG_VSYS_CTRL_VREG20_EN (1u << 0) /* <0:0> R:RW:0: */