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LAUNCHXL-F28379D: ADC Offset Calibration

Bui Van Linh
Intellectual 660 points

Part Number: LAUNCHXL-F28379D

Hello experts,

if I have understood correctly, I do not put the measured offset into the ADCOFFTRIM register but 16 x offset value. Why? Can someone explain it to me?

I have read the procedure at TMS320x2806x. Here it is more understandable for me.

Thanks and Regards - Bui

  • 0
    TI__Mastermind 30185 points

    Hello Bui,

    The reason the result is kept in terms of 16 conversions is because the resolution of the offset trim LSB step is 16, so at least 16 conversions must be done to get an offset trim that can be used. The F28004x has a register description for ADCOFFTRIM that gives a clearer description of this, but essentially the trim is computed in steps of LSBs. The steps mentioned in the F2837xD ADCOFFTRIM register are granular, but essentially they are still steps of 16 per LSB.

    The F2806x cannot be compared to the ADC in F2837xD because they are different designs and have different methods of calibration.

    Best regards,

    Omer Amir

  • +1 in reply to Omer Amir
    Intellectual 660 points

    Hello Amir,

    thank you - Bui