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PSicl.1
PSicl.1
Associate
June 23, 2020
Solved

Utility of GPIO_BEMF

  • June 23, 2020
  • 1 reply
  • 2864 views

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 ?0693W000001rIEpQAM.png

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.
Best answer by Giuseppe Scuderi

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

1 reply

Giuseppe Scuderi
Giuseppe ScuderiBest answer
Associate II
June 30, 2020

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
PSicl.1Author
Associate
June 30, 2020

Hello,

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

Have a great day.

BR

Paul.

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