Protect MCU from backfeed motor suply voltage

[Solitary_Imp]

Hi, im doing a line follower and using the mcu stm32 f411, its a small development board arduino nano style, and i conected it to the motor driver tb6612fng, and it seems to have backfeed motor suply voltage on the logic pins and it burned my mcu.

My question is how to prevent this?

[TDK]

Broadly, you need to respect the voltage limits outlined in the datasheet.

When working with motors and inductive loads, ensure the voltage to a GPIO pin never exceeds the specified value.

Flyback diode - Wikipedia

Inline resistors and RC circuits can be used to filter out noise.