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PWM module vs PWM with general Timer

Luis Afonso
Guru 20670 points
Other Parts Discussed in Thread: LM339

So now that i got the PWM module to work it raised me a question,

What are the advantages? Besides not using a generic timer that can be used for other fuctions.

And will it work better at high frequency? I have a problem that i need a high PWM signal, it's stops being a square wave even when i raise the GPIO current, it just needs to be a square wave with half duty, always. I use it for a serial comunication CLK. Does the PWM module alow more current?

  • 0
    TI__Guru**** 244440 points

    Hello Luis,

    The PWM Module is geared for PWM operations than a timer in the following manner

    1. Able to generate Deadband when PWM Pair is required

    2. Able to sense a fault at speed through GPIO or ADC Digital Comparator and stop PWM output or freeze it

    3. Able to synchronize multiple PWM Generators when a Synchronous PWM operation is required

    Regards

    Amit

  • 0 in reply to Amit Ashara
    Guru 20670 points

    Thanks as always for the quick and concise response

  • 0 in reply to Amit Ashara
    Guru 47900 points

    Amit Ashara said:
    Able to sense a fault at speed through GPIO or ADC Digital Comparator

    Amit's correct in listing those 2 as, "Fault triggers."

    Yet - the presence of digital pin, "PWM Fault Input" enables many more such, "Fault triggers."  And - some may even result from components "foreign" to the MCU.  (i.e. analog comparator (LM339/393 etc.)

    Indeed that PWM Fault Input enables the immediate "shut down" of multiple PWM Generators - potentially protecting your load, your power drivers, power supply and MCU board from destruction.  And - as a "fringe benefit" once the SW configs/sets-up your PWM Fault Scheme - that protection runs w/out SW intervention - it's very close to 100% HW protection - saving you even when SW, "runs amuck!"

    As Amit stated - Timer based PWM is often of value - yet the best/brightest PWM operation springs from the PWM Generators and their full implementation...