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CCS/CC430F6137: Need ADC Result Accuracy

es
Intellectual 370 points
Part Number: CC430F6137

Tool/software: Code Composer Studio

Sir, I am using very accuracy hall sensor. so need very accuracy and constant output. I am using adc reference code for cc430x613x_adc12_01.c. my doubt is,

1. what is different between Vcc reference and (1.5V or 2.5V) internal reference? sorry sir, I don't know, what use reference voltage?

2.what is maximum voltage is possible to apply cc430f6137 ic A0 Pin (ADC input pin).  (3.3V < A0 Pin is possible or not).

3.ADC output reading is not for constant, readings are varies between 1 to 6 no's. (output readings are 3017,3024,3020,3021,3024,3018,3017,..etc.), how to solve this Proble?

(Input supply voltage is constant for MCU - 3.3V  and Sensor - 5V. )

 

  • 0
    TI__Genius 10860 points

    Hi Sivanathi,

    1. the different voltage references impact the full scale range of the ADC input and thus also the accuracy you can get. You'll need to check which reference level still supports the input range you need, but you can enhance resolution by decreasing the reference voltage.

    2.  The device datasheet displays the maximum input range conditions. Please check section 5.35 of the device datasheet. The analog input voltage range is limited by a maximum value of AVcc. In your case I understand this is 3.3 V.

    Sivanathi said:
    3.ADC output reading is not for constant, readings are varies between 1 to 6 no's. (output readings are 3017,3024,3020,3021,3024,3018,3017,..etc.), how to solve this Proble?

    3. Could you be more specific on this question?

    Thanks,

    Britta

  • 0 in reply to Britta Ruelander
    TI__Genius 10860 points
    Hi Sivanathi,

    as I didn't hear back from you I assume that your question has been answered. Please verify the given solution so that others can benefit from it as well. Please know that I'll be closing this thread in case I don't hear back from you.
    If you have a different question, please select "Ask a related question" or " Ask a new question".
    Thanks a lot!

    Best regards,
    Britta