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TMS320F280049: TMS320F280049

coke_kou
Intellectual 510 points

Part Number: TMS320F280049
Other Parts Discussed in Thread: TMS320F28069,

Dear TI engineers，

I have a question for TMS320F280049 when I transplant the code from TMS320F28069 to TMS320F280049.

Three ADCs are included in TMS320F280049. But pins of them are reused on chip. That means one extern analog correspond to three adc results, maybe. At the same time, the number of the extern analog which are needed to measure are not increased.

In this way, waht is enhanced in adc in TMS320F280049？

Maybe, I have a wrong cognition in adc of TMS320F280049. Could you tell me how to realize the adc in TMS320F280049?

Looking forward to your reply. 

Best wishes to you.

  • 0
    TI__Mastermind 42590 points

    Hi Coke,

    Could you be more specific on which ADC channel you are referring to?  F280049 has 3 ADCs and some of the channels are internally connected to all the ADCs at all times (example A10,B1,C10 is the same external pin that connects to all 3 ADCs).  Some of the ADC channels also connect to only one ADC at a time (example A7 only goes to ADCA, C5 only goes to ADCC and B0 only goes to ADCB).

    Regards,

    Joseph

  • 0
    Guru 56278 points

    The C2000 card edge board version has more pins exposed to MCU than the launch pad, of course this kit is much mo $$.

    Perhaps Joseph can point out the link to card edge version ?

    http://www.ti.com/lit/ug/spruic4c/spruic4c.pdf

  • 0 in reply to Joseph Casuga
    Intellectual 510 points

    Dear Joseph，

    So glad to receive your reply.

    In my opinion, the analog input channels are not increased when A10,B1,C10 are the same extern pin.

    So, what is the advantage of this structure compared to TMS320F28069? What is the purpose for this structure?

    Excusing for my stupid, I could not find answer in document.

    Looking forward to your reply. 

    Best wishes to you.

  • 0 in reply to coke_kou
    TI__Mastermind 42590 points

    Hi Coke,

    The ADCs for F28069 and F280049 are different.  In F28069, there is only one ADC module with 2 sample and hold blocks.  In F280049, there are 3 ADC module, each with their own sample and hold blocks and the improved ADC has post processing blocks (PPB) added as well.  The PPB is a feature that is not found in F28069.  The PPB can automatically add/subtract a fixed offset, can detect zero corssing or can flag high or low conversion threshold upon conversion without added CPU cycles so one obvious advantage of the F280049 ADC is that users can detect zero crossing on ADCA, do a threshould compare on ADCB and add fixed/subract offset to ADCC to a common external channel when all 3 ADCs are converting at the same time at the end of conversion.

    Best regards,

    Joseph

  • 0 in reply to Joseph Casuga
    Intellectual 510 points

    Dear Joseph,

    So glad to receive your reply.

    I think I realize the ADC in TMS320F280049 preliminarily because of your detailed explain.

    Thanks for your help. I would hunt for help if I have other questions.

    Best wishes to you.