How to use external reference voltage on STM32F407?

Thread Starter

goutham1995

Joined Feb 18, 2018
85
Hi, I want to know how I can connect an external reference voltage for my STM32F407. The internal reference voltage is at 3.3 volts and my input goes beyond that voltage to about 5 volts. When I feed the 5 volts as input to my microcontroller, I get a wrong reading. So, I want to change the reference voltage to 5 volts using an external source. How do I do that?
 

danadak

Joined Mar 10, 2018
3,509
"Normally" there is a register reference manual on processors, but
I cannot seem to find one online. Lots of manuals, ap notes, even
on ADC but none seem to cover Vref setup.

Maybe contact their FAE or post directly on their support website
if no one else posts on his thread.

Regards, Dana.
 

danadak

Joined Mar 10, 2018
3,509
Asleep at the switch on this one, ebp correct, so you would use a voltage
divider at input and account for that in code.

Regards, Dana.
 
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