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F28335 and 18 PWM channels

Duy BUI
Prodigy 170 points


Hi all,

In the product table of TI web site, the F28335 has 18 PWM channels. But in the datasheet, there are only 6 PWMs modules (ePWM1-ePWM6) and so only 12 channels (ePWM1A, ePWM1B, ePWM2A...). Where can I find the 6 other PWM channels and do they have the same functionnalities as from the 6 PWM modules?

Thanks,

Bui

 

  • 0
    TI__Guru 57255 points

    Bui,

    As you mention, the F28335 has 6 ePWM modules (and therefore 12 ePWM outputs). 

    The remaining 6 PWMs mentioned in the product manual come from the 6 eCAP modules of the F28335.  The eCAP module's APWM mode can be used to generate PWM outputs. 

    The eCAP's APWM timer is 32-bit (as opposed to 16-bit) and provides only a subset of the functionality that exists in the ePWM modules' outputs.  Take a look at the eCAP module documentation for further details.


    Thank you,
    Brett

  • 0 in reply to Brett Larimore
    Prodigy 170 points

    Hi Brett,

    Thank for the explanation. That makes 18 PWM outputs but they are not the same! ePWM modules have rich functionnalities and can be used for motor control (complementary, deadband...) that PWM output from eCAP can not.

    Bui