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You are here: Home / Topics / need help AVCC and ADC

need help AVCC and ADC

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Microcontroller › AVR › need help AVCC and ADC

  • This topic has 1 reply, 2 voices, and was last updated 7 years, 9 months ago by AJISH ALFRED.
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  • October 15, 2014 at 5:17 pm #3296
    dhimas
    Participant

    Please correct me if im wrong, AVCC is used as voltage supplier for ADC and PORT A. If i used 8 bit ADC program (on AVR), and 5v on AVCC, i will have 255 output level which have about 0.019V per level (if the input is between 0-5v, where 5V input will resulting 255b, 2.5V resulting 128b, etc.).

    so, my own conclusion is AVCC = ADC Vreff (im not 100% sure though)

    Here comes the problem;

    I work on a project that have input ranging about 0-1 volt, and i want to have more precise result.

    beside using level converter, is it possible if i supply AVCC port with 1V so 1V input will resulting  255b, 0.5V resulting 128b?

    im working with ATMega16 microcontroller and CVAVR

    please forgive my bad language.

    October 16, 2014 at 12:30 pm #12289
    AJISH ALFRED
    Participant

    Hi Dhimas,

    Why would you assume things when everything is written clearly in the Atmega16 datasheet.

     

    AVCC
    Analog Power Supply: This is the power supply voltage for analog 
    part
    For a normal use this pin must be connected
    AREF
    Analog Reference: reference for analog converter . This is the 
    reference voltage of the A/D converter. As output, can be used by 
    external analog
     
    To know the range of reference voltage that can be applied, please check the ADC section or absolute maximum ratings in the datasheet.
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