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TMS320F28379D: Pins

Ray Vincent Aranzaso
Mastermind 18180 points
Part Number: TMS320F28379D


Hi,

Good Day. What is the limit for accessing ADC pins? How many pins can I access simultaneously at a time? Thank you vey much.

Best Regards,

Ray Vincent

  • 0
    TI__Guru* 82230 points

    Ray,

    On this device we can only sample one channel from each ADC at the same time.  There are 4 ADCs total, and there is no restriction on simultaneous sampling across ADCs, so we can support up to the max ADCs(depending on the device variant they pick), but assuming the superset device, they can sample 4 channels at the same time.

    Previous devices had capability to sample 2 channels at once per ADC, we moved to the above architecture(no simultaneous sample in a single ADC, but multiple ADCs on a device) for better flexibility across system implementation.

    Best,

    Matthew

  • 0 in reply to MatthewPate
    TI__Mastermind 18180 points

    Hi Matthew,

    Good Day. Please see below the response of our customer to your reply. Thank you very much.

    Thanks for information. I am still bit confused. So, I will pose one more question.

    In TMS320F28379D processor, there are 4 modules named A,B,C,D for ADC. Out of which I selected ADC_A0 and fed that to ePWM1 and got output. Similarly, now I have changed my ADC to ADC_A1 and fed that to ePWM2 and got output. But when I am using ADC_A0 and ADC_A1 at same time to get output across ePWM1 and ePWM2 pins. It's not working properly. Like I am getting output across both ePWM pins when I am giving input signal to ADC_A0 and not getting anything on both the pins while input is given to ADC_A1.

    Note: above conditions I have tried by interfacing mentioned processor with matlab2020b.

    And with the solution expert mentioned in previous text I can't access two pins (ADC_A0 and ADC_A1) of same module at a time for ADC conversion? Is it? Could you please clarify this once?

    Best Regards,

    Ray Vincent

  • 0 in reply to Ray Vincent Aranzaso
    TI__Mastermind 18180 points

    Hi Matthew,

    Good Day. I would like to follow up about the customer's latest query. Thank you very much.

    Best Regards,

    Ray Vincent

  • 0 in reply to Ray Vincent Aranzaso
    TI__Guru* 82230 points

    Ray,

    You can schedule multiple channels from the same trigger, but in the example above (assuming the device is starting from reset). ADC_A0 will sample first and ADC_A1 will sample next.  Due to nature of the converter I mentioned the samples not happen simultaneously in time, but they both will happen sequentially.

    Each SOC has to be configured with a specific trigger that will start the conversion, in your case you would make the trigger the same, and wait until ADC_A1 completes to read both results.

    Just a note that I am currently out of the office, so I won't be checking the E2E regularly until the new year.

    Best,

    Matthew