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TMS570LS1227 ePWM resolution

Thomas Rudloff
Prodigy 185 points
Other Parts Discussed in Thread: TMS570LS1227, HALCOGEN

Hi,

what is the resolution of the ePWM on this chip. I recall 160ps from the TMS320. Does this apply to the appropriate Hercules  either?

I am still looking for a very high resolution PWM and meanwhile considered using a 3GBPS serializer  and even some analog stuff to move the edge even finer. Maybe with FPGA support.

When I reviewed the TMS320 some years ago, I found the learning curve to flat. Looks loike it has very much improved with the introduction of the Control Suite. But now I prefer having an ARM micro. Can I directly control the chip and even the calibration without relying on nontransparent libraries? I recognized some sample code, without reviewing it in detail, that allows a centered PWM. Does this apply in high resolution either? On the dsPIC I need an external gate, but would not bother to use this on the Hercules either.

Thanks in advance

Thomas Rudloff

  • 0
    TI__Mastermind 49120 points

    Hi Thomas,

    The TMS570LS1227 Hercules MCU does incorporate 7 instances of the ePWM module. The TBCLK frequency can be as fast as 150MHz, effectively providing a resolution of 6.667ns. These MCUs do not incorporate the HRPWM block required to get the finer ps-scale resolution.

    You can use HALCoGen to setup the ePWM module as well as most other modules that you plan to use in your application.

    Regards, Sunil