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C6747 PWM, SCI and A/D interface

Cristian Bogus
Prodigy 140 points
Other Parts Discussed in Thread: OMAP-L137

Hi folks,

I would like very much to use the C6747 for a high end motor control application. The problem is that (according to some posts this DSP is a little bit immature for now). So I have several questions regarding the maturity of the peripherals:

1. Is the enhanced PWM capable of commanding two 3-phase bridges (as advertised in the data-sheet)? Has anyone played with it? How soon an application note concerning the PWM willl be released?

2. Could the UART or the McASP be used as SCI? Whar about application notes in the near future? 

3. Programming this DSP needs the Code Composer Platinum edition or a usual version like CCS3.3 is OK?

4. Considering the HUGE difference between C6747 in price and performance compared to the last C28x (Delfino series) what is the positionning of the C6747 in respect to the C28x family? Is any porting foreseen?

5. Is an experimenter kit available in the near future?

Regards,

Cristian

  • 0
    TI__Mastermind 18130 points

    Hi Cristian,

    I don't have answers for all of these right now but I'll give this a shot.

    Cristian Bogus said:
    1. Is the enhanced PWM capable of commanding two 3-phase bridges (as advertised in the data-sheet)? Has anyone played with it? How soon an application note concerning the PWM willl be released?
    If the datasheet says it then I don't see any reason it cannot; however, I'm not a PWM guy so I wouldn't know how to set this up.

    Cristian Bogus said:
    2. Could the UART or the McASP be used as SCI? Whar about application notes in the near future? 
    I think SCI is a UART with some additional features(/hardware). Therefore, if the peripheral does not have the specific IP built in it will not function as a SCI. I don't know the SCI interface that well, so I'll dig into this a bit more.

    Cristian Bogus said:
    3. Programming this DSP needs the Code Composer Platinum edition or a usual version like CCS3.3 is OK?
    Code Composer Studio Platinum is just a full version of CCS (currently v3.3). You can use a full version of CCS or the one that comes with the evaluation kit if you plan on purchasing one.

    Cristian Bogus said:
    4. Considering the HUGE difference between C6747 in price and performance compared to the last C28x (Delfino series) what is the positionning of the C6747 in respect to the C28x family? Is any porting foreseen?
    The C6747 is capable of higher performance than the C28xxx parts. The C674x core is a hybrid of both C64x+ and C67x+ cores into a single core giving the benefit of the high performance fixed-point core and flexibility with the floating-point core. The rest of the differentiation comes in the form of the peripherals - you can compare the specific parts by looking at the product folders.

    Cristian Bogus said:
    5. Is an experimenter kit available in the near future?
    Spectrum Digital released a Starter Kit for the OMAP-L137/C6747. You can browse the contents of it here.

  • 0
    TI__Intellectual 1380 points

    Christian,

        I will add on Tim's answers.

        Regarding question 2, as Tim said, SCI can be considered as superset of UART. So if you want SCI to work in UART mode, then the UART on C6747 fulfill the needs. Otherwise it cannot be used.

        Regarding question 4, C6747 has a lot of on-chip memory: 32K L1P, 32K L1D, 256K L2 and 128K L3. If your application can squeeze everything into on-chip memory, you don't even need external SDRAM.