Regards to design reference document for 2156x

Hi , 

 I have a question with regards pin that are not used in 2156x . 

1.When are not using Vdd_ana is fine to keep it NC or we need to connect to a power source .

2.If there are unused PA , PB or PC can they be left NC or should it be connected to ground .

With regards previous sharc DAI pin can be used as GPIO , can we use DAI as GPIO , If we can can you share us a sample code as to how to do it .

Thanking you 

With best regards

  • +1
    •  Analog Employees 
    on Jun 3, 2021 10:43 AM

    Hi,

    Regarding, "1.When are not using Vdd_ana is fine to keep it NC or we need to connect to a power source ."
    >>You should connect VDD_ANA to VDD_REF when HADC is not used. Also, connect HADC0_VREFP to VDD_REF if HADC/TMU is not used. HADC0_VREFN pin can be connected directly to GND if HADC and TMU are not used.

    Regarding, "2.If there are unused PA , PB or PC can they be left NC or should it be connected to ground ."
    >> The Port pins have programmable pull-up/ pull-down which is disabled by default. When present, the internal pull-up/pull-down design holds the internal path from the pins at the expected logic levels. To pull up or pull down the external pads to the expected logic levels, use external resistors.

    Please refer the datasheet for more information on processor pin terminations(ADSP-2156x DESIGNER QUICK REFERENCE Pg. No.: 37/104). The datasheet can be downloaded from the below link.
    www.analog.com/.../adsp-21562-21563-21565-21566-21567-21569.pdf

    Regarding, "With regards previous sharc DAI pin can be used as GPIO , can we use DAI as GPIO , If we can can you share us a sample code as to how to do it ."
    >>Yes, any of the DAI pins can be used as general-purpose I/O (GPIO) signals. You can find an example in the Board Support package. This example toggles LED connected to DAI0_PB08 and DAI0_PB11.

    The Board Support package can be downloaded from the below link.
    download.analog.com/.../ADI_ADSP-2156x_EZ-KIT-Rel1.0.1.exe

    After installing BSP, please navigate as given below.
    <Installation path>\Analog Devices\ADSP-2156x_EZ-KIT-Rel1.0.1\ADSP-2156x_EZ-KIT\Examples\services\gpio\LEDBlink

    Regards,
    Anand Selvaraj.