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Original question:

PGA970: PGA970

PGA970: SPI communication mode selection issue

M MITTAL
Prodigy 20 points
Part Number: PGA970

I'm trying to set SPI communication mode using GUI. In the datasheet, it is mentioned "GPIO_OWI_TX is set LOW". But I could not find this Register in GUI Register Map table. 

  • 0
    TI__Guru** 113765 points

    Hi Kushal Shah1,

    Welcome to the E2E forum!  There are a number of similarities between a number of PGA devices and there are some cut and paste errors in various documentation.  The switch between interfaces is done in the background in the GUI.  The GUI interface sends the appropriate register settings when selecting either SPI or OWI as the interface connection at the top of the GUI.  The low-level register control takes place as stated in the PGA970 device datasheet (as opposed to the GUI user's guide) when setting the configuration in the DIG_IF_CTRL register.  Note that both interfaces can be active at the same time so care must be taken on which interface is being used if both are enabled.  

    For correctly activating the SPI interface, see the PGA970 device datasheet section 7.3.1.14.2.

    Best regards,

    Bob B