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Stm32f4 ADC reference voltages

Question asked by tariq.furqan on May 11, 2014
Latest reply on May 11, 2014 by Clive One
I just started using Stm32f4 Discovery and was working with ADC to get input values from several infra red sensors.

In the datasheet there is mention of VDDA and Vref+ but I have found no such pins on my board. I want to give a reference voltage to my microcontroller and compare my input values with it but I have no clue how to do it.

Also from reading the datasheet and some training manuals I understood that ADC can convert voltages from 0 to 3.6V but I have observed that when I was giving around 3.1 or 3.2V still the ADC showed a maximum of 4096.

It would be of great help if someone guided me how to properly interface my sensors with ADC and what to do about reference voltages.