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Original question:

TMS320F28379D: using the same SOC for different pins within the same ADC module

TMS320F28379D: Sampling issues when Single SOC is configured for multiple ADCs

Sayandev Ghosh
Prodigy 250 points
Part Number: TMS320F28379D

Hi Ti forum,

If an SOC is configured for sampling two ADCs from different module, for eg. SOC1 of ADCA is configured for ADCA1 and SOC1 of ADCB is configured for ADCB0, and SOC3 of ADCA is configured for ADCA2, how does the round robin counter works? Does both the ADCs, A1 and B0, get sampled simultaneously and then the counter shifts to SOC3? In doing so, is there any chance that the one of the ADCs, A1 and B0, are not properly sampled or get stuck to any fixed value? In my case the ADCB0 stops working after some time and provides an erroneous constant value.

Thanks in advance.

Sayan

  • 0
    Mastermind 8025 points
    Sayandev Ghosh said:
    If an SOC is configured for sampling two ADCs from different module,

    I don't think you can do that. SOC1 for ADCA is wholly independent from SOC1 for ADCB.

  • 0 in reply to Kier
    Prodigy 250 points

    Thanks Kiel for the reply.

    Sorry for my misinterpretation. If SOC1 of ADCA is configured for ADCA1 and SOC1 of ADCB is configured for ADCB0. In that case how the round robin counter will work, I am unable to understand.

  • 0 in reply to Sayandev Ghosh
    Mastermind 8025 points

    The round robin concept is only applicable within an ADC module. There's no arbitration possible between two ADC modules. If  ADCB0 stops working then that is nothing to do with ADCA so you do not need to consider ADCA SOCs. You only need to consider SOC arbitration within ADCB.