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ADS7953 manual mode

Other Parts Discussed in Thread: ADS7953

What is the proper sequence to sample one channel 8 times in a row?

Looking at Fig. 50 in the data sheet I am repeating Frame n+2 8 times but I'm only getting the right bit count on the first iteration.

Thanks.

  • Edd,

    Sorry about this delay in responding.

    I am not sure that I understand your question correctly – so please allow me to state the problem as I read it.

    You have configured the ADS7953 for manual mode, selected a particular channel and plan on reading data from that given channel 8 times.

    When you say first iteration, do you mean the first iteration of the n+2 frame or the first data read altogether. One the ADS795x, the first two words captured do not correspond to the channel selected. Please see: e2e.ti.com/.../1077037 for a detailed explanation.

    Could you share a oscilloscope screenshot of the interface signals and indicate on which clock edges the data is captured by your system? Are you getting the expected data (corresponding to the analog input) for the first n+2 iteration?

    Thanks.

    Regards,
    Sandeep
  • Sandeep,
    Thanks for the reply. I meant the first iteration of the n+2 frame which gives me the correct data. Also, it is working now. I do take 8 consecutive readings of the selected channel and get correct results.
    This is so I can average out some noise.
    Edd
  • Edd,

    Good to hear that you got it working.

    Regards,

    Sandeep