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TMS320F28388D: Minimum frequency of operation for High Resolution PWMs.

Tekster
Prodigy 170 points
Part Number: TMS320F28388D


Do the High-Resolution PWMs operate at a certain minimum frequency?  I seem to recall in the datasheet mentioning something about 60MHz minimum for high-resolution PWMs.

Thanks

Tekster.

  • 0
    TI__Genius 11076 points

    Hello Tekster,

    I'm currently looking into the details of this and will get back to you within a day or two. The attached image (emphasis/highlighting mine) is the section of the datasheet you're referring to.

    Regards,
    Jason Osborn

  • +1 in reply to Jason Osborn
    TI__Genius 11076 points

    Hello Tekster,

    I was able to talk to my colleagues and confirm what I was already reasonable certain was the case. Essentially, this note means that the EPWMCLK for the HRPWM-enabled ePWM module being utilized must be at a minimum of 60 MHz. This has no impact on the ability of the ePWM to operate at, for example, 20 kHz- in that case, it simply adjusts the calculations required to determine the value for TBPRD, CMPx, etc., as described in the device TRM section 26.4.3 Calculating PWM Period and Frequency.

    I hope that helps!

    Regards,
    Jason Osborn
    Note: Key takeaways from this post are bolded.