The TAS2764 can operate with or without a VBAT1S supply. When configured without a VBAT1S supply, the PVDD voltage will be used with an internal LDO to generate this supply voltage. A decoupling capacitor should still be populated as recommended in Table 9-1. In this case, VBAT1S_MODE bit should be set to high before transitioning from software shutdown. More details about VBAT1S supply modes of operation can be found in Section 11.1.