AnsweredAssumed Answered

Problem Reading Low ADC Value

Question asked by dashmiz.shadi on Jul 17, 2014
Latest reply on Jul 18, 2014 by Danish Ali
Hi,
I have programmed stm3220G-sk to read two ADC values from two different adcs ADC 1 & 2.
When I connect DC power supply to check the readings, it can read values from 1 v to 3.3 v but cannot read values below 1 v, keeps reading nonsense for zero for example. when I reset the board it will read everything perfectly from 0 to 3.3v but only for once, for example if I reduce voltage from 3 to 0.5 it again cannot read 0.5 volt.

Does anybody have an idea what is going on?
Thank you 

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