STM32L433RCT VDD12 pins - what should I do with them ?

[freeflyer]

I am using the NUCLEO-L433RC-P development board and in the process of designing my own PCB.

But I am unsure what to do with the VDD12 pins

On the NUCLEO-L433RC-P development board they are connected to an SMPS using an analogue switch.

If I dont use an SMPS for the VDD12 pins, do I just connect the VDD12 pins to 100nF capacitors to GND (as shown in the schematic below) ?

My project is battery powered (LiPo 1000mAh) so power consumption is important, but I already have an SMPS for 3.3V and 5V and running out of board space so would prefer to avoid adding yet another SMPS.  

Using an SMPS for the VDD12 pins might also require additional level shifters for UART, SPI and I2C.  

 

 

[TDK]

You can leave them floating/unconnected.

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