Utility of GPIO_BEMF

PSicl.1 · ‎2020-06-23

Hello everyone,

I'm working on the ST B-G431B-ESC1 board and I don't understand the function of the pin GPIO_BEMF from the Back-EMF detection. This pin is in common with the others motor phase. Can you explain the function of this pin please ?

The full schematics is available here : https://www.st.com/resource/en/user_manual/dm00564746-electronic-speed-controller-discovery-kit-for-drones-with-stm32g431cb-stmicroelectronics.pdf

Thank you.

Giuseppe Scuderi · ‎2020-06-30

Hi,

the GPIO_BEMF pin is provided to manage the BEMF sampling during the PWM ON state for 6-Step control only. In this case you can pull down the pin in order to have the voltage divider at BEMFx pin.

BR

Giuseppe

View solution in original post

Giuseppe Scuderi · ‎2020-06-30

Hi,

the GPIO_BEMF pin is provided to manage the BEMF sampling during the PWM ON state for 6-Step control only. In this case you can pull down the pin in order to have the voltage divider at BEMFx pin.

BR

Giuseppe

PSicl.1 · ‎2020-06-30

Hello,

Thank you very much for your reply. It is much more clear.

Have a great day.

BR

Paul.