STM32U5A5QJI6Q Power Supply Review

[Sakthi_IND]

sub: Power Supply Review for STM32U5A5QJI6Q in our Schematic

Hi, 

I’m currently working with the STM32U5A5QJI6Q microcontroller and would appreciate some help reviewing the power supply section of our schematic. Specifically, we are unsure whether it’s correct to leave the following pins unused:

1. VDDUSB – We are not using the USB functionality, so we haven’t connected this pin. Is this fine, or do we need to connect it to any power source?

2. VDDA – We are not using the analog features of the MCU and haven’t connected this pin. Should we tie it to VDD or leave it unconnected (or is there another recommendation)?

Could anyone take a look at the power supply area of our schematic and let us know if everything looks correct, or if we should make any changes?

[TDK · Accepted solution]

Connect them to VDD if not used.

Here is the hardware design guide:

Getting started with STM32U5 MCU hardware development - Application note

Otherwise schematic seems okay.

[Sakthi_IND]

Hi Guru, Thank you for the update.

Regards,

Sathiya