Doubt on how to interface a 5V circuit to a 3V microcontroller (STM32)

[Killstreet30]

 

As you can see in the above image, I'm trying to design a motor controller. But pin 16 of L293D requires a 5v input as VCC1 but the maximum output a STM gives is 3V. I wanted to know how to convert and map the 3V to 5V using a passive component?

[RomainR. · Accepted solution]

Hello @Killstreet30 (Community Member)

The best is to use voltage level translator to interface STM32 with L293D driver.

A 8 I/O's level voltage translator IC:

https://www.st.com/en/interfaces-and-transceivers/st2378e.html

Or here using transistor:

https://maker.pro/custom/tutorial/how-to-use-a-logic-level-shifter-circuit-for-components-with-different-voltages

Best regards,

Romain

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[LCE]

That 2nd link, the npn + MOSFET level shifter should have a resistor in series with the npn's gate.