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RTOS/AM5726: Delta-Sigma support on PRU

Alexander Aganichev
Intellectual 620 points
Part Number: AM5726

Tool/software: TI-RTOS

The upcoming AM6x devices are advertised to be capable to handle 18 Sigma-delta filters per more powerful PRU. Just wondering if AM5726 is capable to handle 4 filters per PRU and if some similar reference design exist?

Industrial Drives package seems to supports only one Delta-Sigma ADC. Is there guide how to scale channel number and performance estimate?

Best regards,
Alexander

  • 0
    TI__Genius 10440 points
    Alexander,

    Please find Table 2 in the 'PRU-ICSS Feature Comparison' Application Report here: http://www.ti.com/lit/sprac90c

    It shows that AM572x devices do not have the Sigma Delta interface. This interface can be found on AM570x, AM571x, and AM574x devices though.

    The hardware interface has support for up to 9 channels of Sigma Delta bit-streams from 9 Sigma Delta modulators. This hardware supports the accumulation portion of the filtering and a PRU firmware handles the decimation.

    The Industrial Drives package that you mentioned provides an example that is targeted at a 3-phase drive application where channels 5, 6, and 7 are being used to perform both a SINC2 and SINC3 filter simultaneously on three phase currents and channel 1 is used for a SINC3 filter for a DC Bus voltage measurement.

    The documentation for the example can be found in the Industrial Drives package in <%Industrial Drives Package Location%>/interfaces/sddf/doc/SigmaDelta_am437x_design.pdf

    Jason Reeder
  • 0 in reply to Jason Reeder
    Intellectual 620 points

    Jason,

    Thank you for clarification.

    Best regards,
    Alexander