Hi I want to sample low voltage signals with STM32L476 so I figured it would be a good option to reduce reference voltage and I found this part in the MCU datasheet:
Now I am using ADC in dual mode and sampling 8 bit so it is not too precise for low voltages.
In ADC1 settings, there is a checkbox:
Is it enough to set it to shift Vref from 3.3 to 2.048 or how should I set my reference voltage to 2.048?
Also If I decide to use an external Vref can I just connect lets say 1V to Vref+ for MCU to change Vref for ADC to 1V from 3.3V.
> Is it enough to set it to shift Vref from 3.3 to 2.048 or how should I set my reference voltage to 2.048?
VREFBUF is enabled in the SYS tab. VREFINT is and ADC channel and is not relevant here.
> Also If I decide to use an external Vref can I just connect lets say 1V to Vref+ for MCU to change Vref for ADC to 1V from 3.3V.
No, there are limits on VREF+, see datasheet.
Thank you for the quick reply. I checked the system thinking it might be under there but I cannot see VREF Buffer option.
