FDCAN bootloader on UFBGA169 STM32H743AI

[DrDro]

Hi,

App note AN2606 says I should use FDCAN1_Rx pin PH14 (similary Tx pin) to be able to use FDCAN bootloader but selected package UFBGA169 doesn't have such pins.

Can I use default FDCAN Pins to work with bootloader?

[KDJEM.1 · Accepted solution]

Hello @DrDro ,

A similar question is already asked here.

For STM32H743, you can activate the FDCAN bootloader with only by PH13/PH14 pins.

When your question is answered, please close this topic by choosing "Accept as Solution". This will help other users find that answer faster.

Kaouthar

[Javier1]

What does that mean "you can activate the FDCAN bootloader with only by PH13/PH14 pins."?

Those pins dont exist right?

[KDJEM.1]

Hello @Javier1

As mentioned in AN2606, for STM32H74, the FDCAN bootloader pins are PH13 and PH14. So, if the PH13 and PH14 pins are not available in some packages, the FDCAN bootloader is not supported. 

The LQFP100, TFBGA100, LQFP144, and UFBGA169 STM32H743 packages do not have PH13 and PH14 pins, so the FDCAN bootloader is not supported.

Thank you.

Kaouthar

[Andrew Neil]

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@KDJEM.1 wrote:

if the PH13 and PH14 pins are not available in such packages, the FDCAN bootloader is not supported. 

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That's really not very clear at all!

See: 

https://community.st.com/t5/stm32-mcus-products/fdcan-rom-bootloader-pins-for-stm32h743zi/td-p/762439

And:

https://community.st.com/t5/stm32-mcus-embedded-software/fdcan-bootloader-for-stm32h750vb/td-p/95844

The document needs to be updated to make this clearer.

[KDJEM.1]

Hello, 

Thank you @Andrew Neil and @Javier1 for reporting your feedback about the AN2606 application note. I reported internally your suggestion to add a note “Where these pins are available” to clarify the behavior this discussion FDCAN ROM bootloader pins for stm32H743ZI - STMicroelectronics Community.

Note that, also I reported internally the datasheet typo for correction.

Thank you for your contribution in STCommunity.

Internal ticket number: 200567  (This is an internal tracking number and is not accessible or usable by customers). 

Kaouthar