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Original question:

TMS320F28377D: PWM wavefrom generation

TMS320F28377D: Pwm waveform generation

Aleksandr Sheianov
Prodigy 185 points
Part Number: TMS320F28377D


Hi Jason,

Unfortunatelly, i just realised that 28377D microprocessor doesn't have CLB modules in it. Only 28379D has it. Is there any other way to implement the tripple switching waveform as I presented in the first picture of this thread?


Also, suppose I would switch to 28379D, is it possible to connect the output of CLB module to lets say ePWM8?

Best regards.

  • 0
    TI__Guru 50611 points

    Hi,

    The subject matter expert is out of office due to holiday break. Please expect response by 1st week of January. Sincere apology for inconvenience.

    Regards, Santosh

  • 0
    TI__Genius 11076 points

    Hello Aleksandr,

    Apologies, I didn't realize that the 28377D didn't have the CLB. In that case, really the only option I can think of is for the waveform to rely on the CTR=PRD and/or CTR=0 events. This is quite a bit less configurable than the CMPx events, unfortunately.

    As for your second question, that is possible, yes- if you glance at the device TRM section 26.3.4 Table 26-3, the signals listed as 'PWMx', 'AQ_PWMx', and 'DB_PWMx' override the final, Action Qualifier, and Deadband outputs of each PWM channel (A,B), respectively.

    Regards,

    Jason Osborn

  • 0 in reply to Jason Osborn
    Prodigy 185 points

    Hi Jason,

    Thank you for your reply!

    Regarding my second question you said that according to the table 26.3 it is possible, however i didn't find in this table that the output of CLB can be connected to ePWM8 AQ module. The output of CLB can only be connected to ePWM1,2,3,4 AQ modules.

    Best regards,
    Aleksandr Sheianov

  • 0 in reply to Aleksandr Sheianov
    TI__Genius 11076 points

    Hello again Aleksandr,

    Apologies, I misunderstood your question. I thought you were asking whether or not, in general, the ePWM could be connected to the CLB- I missed that you were asking about ePWM8 specifically. Unfortunately, the listed connections are the only options for the CLB output.

    Regards,

    Jason Osborn