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PGA900 Target Configuration

Carlos Rivera
Prodigy 60 points
Other Parts Discussed in Thread: PGA900, USB2ANY

I'm using CCS 6.1.2 and I have the PGA900 EVM with the sample codes. But I can't find the necessary files to select the PGA900 target as the Software Quick Start Guide indicates in the target configurations because of missing files (PGA900.xml, PGA900.gel, etc.). Can someone point me in the right direction to where I can download these files from the "software release package"? 

Thank You!

  • 0
    TI__Expert 4420 points

    Hi Carlos, both files (pga900.xml and pga900.gel) are located in the docs folder of the reference firmware located at ti.com. Below is the link to download the reference firmware.

    http://www.ti.com/lit/zip/sldc010

    Please follow the instructions on p. 12 of the software quick start guide on where to place these files.

    Thanks,

    JV

  • 0 in reply to Javier Valle
    Prodigy 60 points

    Hello,

    I've programmed the PGA900 successfully using Code Composer and the GUI but I still have a problem with the DAC output.

    Using the GUI it lets me write data to DAC_REG0 but when I press read it returns to zero code and sometimes it writes but output becomes almost VDD. My EVM isn't the current one in the market so I'm using a draft of the EVM User's Guide in which pin numbers are the same as mine. I tried it using the default configuration and the voltage mode configuration and its the same result.

    My closed connections are: J1 (2 to 3), J8 (1 to 2), JP3, JP4, JP5, JP12, JP13 and J7 (USB2ANY).

    Using the steps given in the EVM Quick Start Guide the output value is always zero even when using TOP_TON as output and sometimes VOUT takes VDD value.

    Is my configuration wrong?

    Here's a picture of my EVM model.

    Thanks.

  • 0 in reply to Carlos Rivera
    TI__Expert 4420 points

    Carlos, this was one of our pre-release EVMs and it is a bit different from the one we currently sell at ti.com. I probably shipped this one to you or your professor myself :-). Your connections are correct for voltage mode except that you don't really need to close JP4 unless you are programming the OTP, that is the only time is needed.

    Regarding writing to the DAC using the GUI, you can only do that when the micro is in reset. There are only 3 registers you can write to while the micro is running but the DAC registers are not part of that. If VOUT is railing when the micro is running (assuming there is firmware in it), please keep in mind that the DAC is 14 bits and the ADC is 24 bits, therefore, some scaling is needed to avoid VOUT railing.


    Since this is a different EVM than the released version, I will follow up with you offline to avoid confusion in the forum.

    Thanks,


    JV