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ADuC845 Calibration Logic

From the ADuC845 datasheet,

                      The result of the zero-scale calibration conversion is stored in the offset calibration registers for the appropriate ADC. The result of the full-scale calibration conversion is stored in the gain calibration registers for the appropriate ADC. With these readings, the calibration logic can calculate the offset and the gain slope for the input-to-output transfer function of the converter.

What is the Calibration logic used here?

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  • The offset and gain calibration coefficients are held in the following ADC SFR:
    OF0L/M/H
    OF1L/H
    GN0L/M/H
    GN1L/H

    You can monitor the registers if there are any changes.

    The default offset and gain coefficients are specific to each device. The coefficients are overwritten once the user initiates a calibration procedure.

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