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STM32F767 - VDDA, VDDS, Vusb Pins

hashtala
Associate II

‎2020-05-09 01:58 AM

Hello

I am drawing my own PCB layout including STM32F767. However, I do not need ADC, DAC or USB. Can I leave VDDA/VSSA and Vubs pins floating or do I still have to wire them for the proper operation of MCU?

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waclawek.jan
Guru

‎2020-05-09 03:27 AM

> Can I leave VDDA/VSSA and Vubs pins floating

No.

> do I still have to wire them for the proper operation of MCU?

Yes.

VDDA/VSSA does not power only ADC and DAC, but also e.g. the oscillators block. I'm not going to look up what VUSB does in your particular STM32 model, but it's likely the related GPIOs are powered by it.

JW

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