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ADS1256: Calibration procedure and settings

Bert Van Opstal
Prodigy 30 points
Part Number: ADS1256

HI, I like to know how to interpret the  3 OFC and the 3 FSC register by the ADS1256.

In the manual they speak about to do a System Offset Calibration and a System Gain Calibration. And this action will update the OFC and FSC register. But they are 3 for OFC and also 3 for the FSC??? How do you know where the chip has stored the last calibration settings ? Or, how do you know which OFC,SFC parameters he took as current setting ?

Best regards,

Bert

  • 0
    TI__Mastermind 44680 points
    Hi Bert,

    Welcome to the TI E2E Forums!

    The ADS1256 calibrations commands will take a number of conversions and the average value of these conversions will be used to update the OFC[0:2] or FSC[0:2] registers (depending on whether you perform the offset or gain calibration) .

    All three registers should be updated and you'll know when because the /DRDY pin will go low to indicate that the calibration has completed. After calibration, you can use the RREG command to read the new calibration register values.

    I hope that helps,
    Chris
  • 0 in reply to Christopher Hall
    Prodigy 30 points
    Many thanks Chris for this extra information. It was useful. In mean time, I realize that the ads1256 is a 24bit DAC- converter. So that means that you need to fill in 3 bytes to reach 24 bit. Or 3 registers of 8 bits. I didn't realize that this is also the case for fine-tuning the offset and the Full Scale Gain calibration. What is also interesting to detect is that every byte, out of 24 bits, can be modified separately .
  • 0 in reply to Bert Van Opstal
    TI__Mastermind 44680 points

    Hi Bert,

    Glad I could help! Let us know if you have any additional questions.

    Best regards,
    Chris