STM32F373 and USB with 2.0V power supply

sylvain239955_stm1_st · ‎2015-03-10

Posted on March 10, 2015 at 17:38

Hello,

I'm trying to use the USB of STM32F373RCT6 at 2.0V with the mass storage device code generated from STM32CubeMX.

The board is ok with a power supply above 2.4V. With a power supply under 2.4V the device is unknown under Windows.

I haven't see any limitation on datasheet about USB running at 2V. Can you confirm the USB can run at 2V?

Thanks !

tsuneo · ‎2015-03-12

Posted on March 12, 2015 at 13:14

> I haven't see any limitation on datasheet about USB running at 2V.

You are missing this section of the datasheet

http://www.st.com/st-web-ui/static/active/en/resource/technical/document/datasheet/DM00046749.pdf

6.3.23 USB characteristics (p107)

VDD: USB operating voltage -- 3.0 (min), 3.6 (max) volt

3. The STM32F3xxx USB functionality is ensured down to 2.7 V but not the full USB electrical characteristics which are degraded in the 2.7-to-3.0 V VDD voltage range.

Tsuneo