What is the differences between TT and FT mode for usb pins PA12&PA11 in STM32U595?

[Yang Yang]

Hello, ST expert

For GPIO structure, what are the differences between FT and TT mode? Are there any differences for the ESD diode and the other diode in these two modes?

BR

Yang

[Andrew Neil]

https://www.st.com/resource/en/datasheet/stm32u595zi.pdf#page=110

via: https://www.st.com/en/microcontrollers-microprocessors/stm32u595zi.html

[Yang Yang]

Hello, Neil

I know what FT and TT means. The question is what are the differences in the GPIO structure in these two modes? e.g. the state of analog switch in the graph? or any other difference?

BR

Yang

[FBL]

Hi @Yang Yang 

TT pins have clamping diodes to VDD limiting voltage tolerance to VDD + 0.3V. However, FT can tolerate 5V in input/open drain mode without internal pull-up/pull-down.

[Yang Yang]

Hello, FBL

Does that mean there are not any differences about the internal ESD diode and the other diode(circled in the first graph) in these two modes?

BR

Yang

[Andrew Neil]

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@Yang Yang wrote:

I know what FT and TT means.

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But I didn't know that you know!

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@Yang Yang wrote:

the state of analog switch in the graph?

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The graphic you posted says that there is no analogue switch in TT