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TMS320F2800155: AMC0386

Daria Kiseleva
Expert 3175 points

Part Number: TMS320F2800155
Other Parts Discussed in Thread: AMC0386

Tool/software:

Good day, colleagues,

My customer is working on a grid voltage sensing design using the AMC0386 with a TMS320F280015x microcontroller:

The AMC0386 outputs a 1-bit delta-sigma modulated bitstream, and I am implementing a Sinc³ filter in software with an oversampling ratio (OSR) of 256 as recommended in the datasheet. At this point I would like to ask a few questions regarding this application. First question is given the 10 MHz CLKIN to AMC0386, would it be appropriate to use the eCAP peripheral for capturing the bitstream, or is my current approach using ePWM for CLKIN generation and GPIO ISR sampling more suitable? And my second question is does TI recommend using a different C2000 device that includes a dedicated delta-sigma demodulator (e.g., SD filter module) for better performance and reduced CPU load in this type of application?

I would appreciate your guidance on whether the TMS320F280015x is adequate for this task, or if an upgrade to another C2000 device would be beneficial.

Thank you,

Daria

 

  • 0
    TI__Mastermind 27736 points

    Hi Daria,

    Daria Kiseleva said:
    First question is given the 10 MHz CLKIN to AMC0386, would it be appropriate to use the eCAP peripheral for capturing the bitstream, or is my current approach using ePWM for CLKIN generation and GPIO ISR sampling more suitable?

    If you have an eCAP peripheral not being used, then yes I would say it would be appropriate to use the eCAP peripheral for capturing the bitstream. eCAP can capture up to 4 edge events such as rising, fall, rising, fall. There are 4 counters used for each of these events. Then you can generate an ISR on any of these events to do some computations.

    If you want to compare this clock in put to another clock source, then I would suggest to use the DCC module.

    Daria Kiseleva said:
    And my second question is does TI recommend using a different C2000 device that includes a dedicated delta-sigma demodulator (e.g., SD filter module) for better performance and reduced CPU load in this type of application?

    Yes there are other C2000 devices that include SDFM module. A couple of newer devices you could take a look at are 

    1. F28P65x 
    2. F29x 

    Best regards,

    Ryan Ma