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CCS/UCD3138: UCD3138 oversampling

user5779721
Intellectual 525 points
Part Number: UCD3138

Tool/software: Code Composer Studio

Hello 

As I konw, In UCD3138  DPWM can trigger EADC oversampling of 2, 4, or 8 samples,in one cycle.

When i oversampling 8 samples modle ,Does all the samples will get into the CLA participation in computing? Then has 8 different values get into the  CLA .So the CLA will  Calculate 8 times?

Or just the CLA Calculate one time in one cycle?

  • 0
    TI__Expert 4070 points

    Hello,

    An engineer is looking into this and will respond.

  • 0 in reply to Amiel Hussain
    TI__Genius 17090 points

    You can actually choose a variety of options.  But you also have to bear in mind that the filter takes about 500 nsec to run.  If you oversample at a rate greater than 2 MHz, you won't actually get that rate.  

    If you use the default configuration bits, you will get a filter run with each sample.

    You can also select different averaging modes - in these, the specified number of samples will be averaged, and then the filter will be run.  

    See the UCD3138 Technical Reference Manual:

    www.ti.com/.../sniu028a.pdf

    Look at the Front End section for information on averaging.