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PGA970: EVM problem

FRANK1
Expert 8005 points
Part Number: PGA970
Other Parts Discussed in Thread: USB2ANY,

Hi sir,

I have connected 5 wire LVDT with EVm using USB2ANY.
I could able to generate waveform for required frequency.
But I can't see the output at pin Vout corresponding to LVDT movement.

I could see ADC capture waveform.

can you help me where is the problem?

  • 0
    TI__Mastermind 31655 points

    Hello Frank,

    The VOUT output is not connected to the demodulator outputs on the PGA970 by default. You will have to use some firmware on the internal M0 microcontroller that processes the demodulator outputs into a single DAC output code, and then commands the DAC to that value. You can test the output DAC on it's own by using the GUI, but if you want the output to be tied to the input you will need to write some firmware for the part.

    For reference on the PGA970 firmware please see this post: https://e2e.ti.com/support/sensors/f/1023/t/802433

    Regards,

  • 0 in reply to Scott Cummins
    TI__Expert 8005 points

    Hi Scott,

    Thank you for your help.

    customer have uploaded hex file generated from PGA970 Generic firmware-installer, on FRAM using USB2ANY, but could not see any change at Vout.

    Thanks.

    Regards,

  • 0 in reply to FRANK1
    TI__Mastermind 31655 points

    Hello,


    I should have specified that the reference firmware does not connect the demodulator outputs to the to the DAC either. The reference firmware is provided to give an example of the program structure and shell functions that will be needed to build a complete application. It is the user's task to develop their algorithm for processing the demodulator outputs and passing the result to the DAC to generate an output. 

    Regards,