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ADC128S052: stepping the channels in continous mode

Felix Risch25
Intellectual 1110 points
Part Number: ADC128S052


Hello team,

I have a question regarding the continuous mode. Is it possible to step through the each channels and sample it. Or is it only possible that one channel is sampled continuously, no matter which channel is selected?

Thank you for clarification and kind regards,

Felix

  • 0
    TI__Expert 3175 points
    Hi Felix,

    I am looking into this and will get back to you.
  • 0 in reply to Evan Sawyer
    TI__Genius 16890 points
    Hi Felix,
    You can do either in continuous mode, either step through every channel or only sample one channel. The only difference between normal mode and continuous mode is that in continuous mode the CS signal stays low. It does not go high (thus putting the part into shutdown mode) in between each conversion.
    Figure 1 in the datasheet shows the timing for continuous mode. CS stays low. You still need to send the Control register byte for each conversion, just like in normal mode. This means that you can sample through channels or sample any order or number of channels.

    Mike
  • 0 in reply to Michael Stout
    TI__Intellectual 1110 points

    Hi Mike,

    just to clarify: I understand it that way that it is possible to sample random channels in continous mode?

    Regarding that, how can I catch the following statement in the datasheet:

     

    "While a conversion is in progress, the address of the next input for conversion is clocked into a control register through the DIN pin on the first 8 rising edges of SCLK after the fall of CS."

    Does that mean, it is not neccessary to toggle the CS signal, meaning it can be set to ground?

    Thank you and kind regards

    Felix

  • 0 in reply to Felix Risch25
    TI__Genius 16890 points

    Hi Felix,

    That is correct, you do not need to toggle the CS pin in between writes to the DIN pin.  You only need the falling edge at the beginning and the rising edge at the end of the communication as shown in Figure 1.

    Mike