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ADS7953EVM-PDK: PHI Controller Board Inquiry

Carlos Ventura
Prodigy 180 points
Part Number: ADS7953EVM-PDK
Other Parts Discussed in Thread: ADS7953

I’m taking a look at the ADS7953EVM-PDK demo kit and had a few inquiries related to utilizing the PHI controller board with a custom board here at LM that utilizes the ADS7953SBRHBR (VQFN w/ single GPIO instead of the demo kit’s ADS7953SBDBTR w/ four GPIO on TSSOP package). If possible, I’d like to use the PHI controller and the ADS7953 EVM GUI rather than just breaking out our ADC to a separate SPI host adapter (e.g. aardvark).

  • Does the PHI Controller board directly mate w/o a cable to the demo board’s J7 samtec connector?
  • Do you see any issues connecting our ADS7953SBRHBR part to the PHI controller even if it is the TSSOP package w/ only Qty1 GPIO?
  • Do you have any sample ADS7953EVM-PDK demo kits you’d be able to send our way?

  • 0
    TI__Genius 15160 points

    Hi Carlos,

    1. Yes, the PHI directly connects to the ADS7953EVM's J7 connector. Here is a screenshot from the ADS8681EVM user's guide showing that in action.

    2. Without more information about your custom board, I can't make a judgment on that. If it is functionally similar to the ADS7953EVM, just with the VQFN package instead of TSSOP, it should largely work the same, just with GPIO1, GPIO2, and GPIO3 unavailable. I noticed you crossed out some parts of the EVM schematic that if removed would cause the GUI to be unusable with the ADS7953. If you'd like some more feedback, could you repost this on the internal forum?

    3. Yes, EVM samples are available at samples.ti.com.

    Best,
    Joel

  • 0 in reply to Joel Meraz
    Prodigy 20 points

    Hi Joel, 

    In regards to the J7 signals interfacing the PHI Controller - would you only need the below signals for the GUI to be usable? 

    • SDI
    • CSn
    • SCLK
    • SDO
    • GPIO0
    • +VBD (3.3V from external power supply) 

    Thanks,

    Jordan

  • 0 in reply to Jordan Yamson
    TI__Genius 15160 points

    Hi Jordan,

    The EEPROM is necessary to change some parameters of the PHI, and this is checked by the GUI. The answer also depends on what you consider the GUI to be usable. If you're only interested in data capture, you won't need any of the GPIOs. 


    If you can power any devices externally from the PHI, you strictly only need the EEPROM, its I2C data lines, and the ADS7953's SPI lines to capture data on the GUI. You can set everything else manually with hardware. This won't allow you to use any GPIO functions however. 

    Regards,
    Joel