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TMS320F28069: Advisoty: ADC: Initial Coversion: Workaround

Hideaki Nambu
Mastermind 9165 points
Part Number: TMS320F28069


Hello,

Errata SPRZ342K>

The magnitude of error is significantly reduced by writing a 1 to the ADCNONOVERLAP

bit in the ADCCTRL2 register, which only allows the sampling of ADC channels when the

ADC is finished with any pending conversion.

 

Could you please tell me the above in other words?

Does it mean the ADC will not start in any conditions?

Or, does it mean any extra points other than the TRM explanation? :

TRM spruh18g, p521> NOTE: The NONOVERLAP bit in the ADCCTL2 register, when enabled, removes the overlap of sampling and conversion stages.

 

  • 0
    TI__Genius 17370 points
    Hello,
    I am writing to let you know that a C2000 team member has been assigned to this post and should be answering shortly.

    Regards
    Baskaran
  • 0
    TI__Guru 62975 points

    Hideaki-san,

    The behavior is correctly described in the TRM:

    For instances where multiple SOCs are pending:

    In the default OVERLAP mode, the ADC will begin to charge the S/H cap for conversion N while the previous conversion N-1 is still processing.

    When the ADCNONOVERLAP bit is set, the S/H cap for conversion N will not begin to charge until conversion N-1 is finished.

    So to elaborate on your highlighted text:

    which only allows the sampling of ADC channels [S/H cap for Conversion N] when the ADC is finished with any pending conversion [N-1]

    -Tommy

  • 0 in reply to tlee
    Mastermind 9165 points

    Tommy and Baskaran,

    Thank you very much. I understood.