I have a PWM signal on stm32 that I want to boost from 1.6V to 12V . I've researched that I can use a voltage level shifter(LOW to HIGH) , but as of now I have a transistor or a FET that I could use possibly . The Gpiox pin voltage is 3.3V Tolerant and on a 50% duty cycle I get 1.6V . I plan to scope it the signal outputting my desired voltage , not sure how to go about it in terms of what resistor to use , what to look out for to not damage the chip .

 

What is the frequency and purpose of this PWM signal?
A transistor can do the job, but note that the signal will be inverted.

 

The purpose is to send a PWM signal of(12V) to wake up an external motor

 

hi Ob,
This is another option.
E

 

Use a “Low side driver” such as MCP1402.

 

hi Ob,
This is another option.
EView attachment 334285

if i'm not mistake in my case the pin that I want more ouput will be connected to base which is 1.6V , my board GND can have a commond ground

hi Ob,
This is another option.
EView attachment 334285

Looking at this example I would I connect it? I have a power supply of 3.3 and trying to have my pin(A3) to output the 12V

 

Hi Ob
Add this extra 1k R4
E

 

How much current do you need from the 12V Signal?

 

You are looking at this all wrong. You do not need to convert a 1.6V output to a 12V output.

What you need is to control a 12V motor with a signal that is sometimes 0V and other times 3.3V at other times. You want the motor powered when the signal is 3.3V and not powered when the signal is 0V.

The simple way to do this is to connect the + lead of the motor to 12V, connect the - lead to the collector the drain of an N-channel logic level MOSFET, connect the source to ground and connect the gate to the signal. That is known as a low side switch.

The gate driver that @Ian0 suggested is a low side switch that can provide a much higher current to switch the MOSFET more quickly. It may or may not be needed depending on the frequency of the PWM signal and the current you need to switch.

 

The purpose is to send a PWM signal of(12V) to wake up an external motor

What does it mean to "wake up an external motor"?

Are you simply turning it on and off with your microcontroller?

Are you controlling the speed of it?

Are you enabling some kind of control circuit?

 

What does it mean to "wake up an external motor"?

I was wondering how you could tell if it was asleep.

 

I was wondering how you could tell if it was asleep.

If it's anything like my wife, you just put a microphone near it and detect the snoring, using an attenuator so as not to blow out your ADC.

 

What does it mean to "wake up an external motor"?

Are you simply turning it on and off with your microcontroller?

Are you controlling the speed of it?

Are you enabling some kind of control circuit?

It will be powered by a power supply of 12V , the PWM signal is for communication purposes with the Motor . Most cars use CAN for communication , there are a few that use PWM but i'm sending this signal from my microcontroller and I a need to boost that up to 12V since it's IO pins Max tolerance are 3.3V.