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Original question:

ADS7953: CS PIN SWITCHING

ADS7884: Can this device operate in continuous mode ? (CS held low)

Tonio Graham
Prodigy 20 points
Part Number: ADS7884

Will the ADS7884/7885 perform successive(continuous) conversion & output consecutive data words ? eg: if CS is held low.

     I have read datasheet  section a number of times but I cant quite be sure.

I need to acquire about 64 samples at 3Mhz sample rate (too fast for my cpu 16F1509 to process)

  I am looking at using an SPI SRAM device to capture SPI data so I can read into uController & process .

     (I have tested the SRAM & successfull capture of consecutive SPI bit data with another device)

If CS must be set Hi -> Lo to initiate a new conversion I may be able to use the timer(s) & CLC to do this)

  • 0
    TI__Guru**** 171716 points

    Hi Tonio,

    The /CS input cannot be held continuously low with the ADS7884.  The is a minimum high time (tw1) for /CS between samples, also the first few paragraphs below Figure 1 on page 8 give you an idea of how to use the /CS input.  You can short cycle a conversion, and re-start (re-sample), but you have to toggle the pin first.