Utility of GPIO_BEMF

2 replies
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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.

This topic has been closed for replies.

Giuseppe ScuderiBest answer

Associate II

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

Giuseppe ScuderiBest answer

Associate II

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.1Author

Associate

Hello,

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

Have a great day.

BR

Paul.

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