AVR-Chat

>
>> This is pretty typical in my experience, just beware the "precision" reference on chip.
>> 2.7V for a 2.5V reference, into a 10 bit ADC, is pretty funny, in my opinion.
>
>No kidding! This is at the top of the ADC module:
>
>
>        // adc "precision" ref correction value in EEPROM
>
>        #pragma data:eeprom
>
>        //double  Ref_Cal_Val = 1.071094;     // Bd #1 = 2.742V
>        double  Ref_Cal_Val = 0.9921875;     // Bd #2 = 2.540V
>
>        #pragma data:data


In my case, when I discovered this, I had to add an external reference.
Now this meant that the external reference would be a hand-add until the new PCBs became available, so I had to check wether the external PRECISION reference was present by checking it against the internal "precision" reference..  

Isn't development fun?