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ADS1292R absolute minimum connections needed for SPI comms

Joe Desbonnet
Intellectual 355 points
Other Parts Discussed in Thread: ADS1292R

I'm attempting to write a SPI software driver to communicate with a ADS1292R. At the moment I don't care about any ADC functionality: I just need to be able to read/write registers etc and get the software part of this project on the way.  I've got a ADS1292R sample soldered on a TQFP32 breakout board and so far I'm not reading anything back from it.

My question is: what is the absolute minimum I need to connect achieve basic SPI communications? Obviously DVDD, DGND, and the SPI lines: DOUT, SCLK, DIN and /CS. I've got /RESET tied high.  Anything else? Can I leave the other pins float?  

Thanks! (sorry a bit of a RTFM type of question :)

Joe.

  • 0
    TI__Guru**** 180931 points

    Hi Joe,

    Remind me to take a picture of my coffee mug and post it here somewhere...  You've got the basics down, power, ground and the SPI lines is the 'minimum' you need for the COMMs side of things.  You'll probably also want to address the VCAPx pins and VREFx to get the bandgap and internal reference stable, but the analog inputs along with the RESP and GPIO pins could remain floating in order to do some basic read/write debugging on the software side of things.  You might also consider wiring DRDY to an interrupt input on your controller.