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

Sayandev Ghosh

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

over 2 years ago

0 Kier over 2 years ago

Mastermind 8045 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 Sayandev Ghosh over 2 years ago 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 Kier over 2 years ago in reply to Sayandev Ghosh

Mastermind 8045 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.

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