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ADS131A04EVM: GUI data capture

Amy Luo
Expert 6895 points
Part Number: ADS131A04EVM

Hi team,

One of our users cannot capture data using the EVM and the GUI. After he clicks the Capture button, the following screenshot appears: 

After waiting for more than a dozen or 20 minutes, there are still no other prompts, pop-ups, etc.

The procedure follows the ADS131A04EVM User's Guide instructions and the LEDs indicate normal. 

In the case of GUI continuous capture, the user measured the SPI signal on J7 and found no communication waveform. During the checking, the EVM_RAW_5V is found to be 4.5V, not 5V. Further measurements revealed that the USB voltage is 4.68V and not 5V. Does this cause the capture problem described above? What are the other possible causes of the capture problem described above?

Best Regards,

Amy Luo

  • 0
    TI__Mastermind 40191 points

    Hi Amy Luo,

    Can you please enter the customer's name in the Notes section of the Thread Tracking Toolkit?

    To clarify, you said the customer is probing the digital signals on J7 and does not see any communication? That is, not even SCLKs or communication on the DIN pin to indicate that the GUI is sending data to the ADC? Or they do not see any communication from the ADC, for example on DOUT or DRDY, but the GUI is sending commands to the ADC?

    Given the settings shown on the screen, the data should be available in a few 100 ms. So the customer should not wait several minutes, it should happen very quickly

    Are you connecting the EVM through a USB hub instead of connecting it directly to a computer?

    Please send a picture of the EVM setup

    -Bryan

  • 0 in reply to Bryan Lizon86
    TI__Expert 6895 points

    Hi Bryan,

    Glad to see your reply.

    Yes, there is no communication. No clock signal seen, DIN is low DOUT is high. Don't see the GUI sending commands to the ADC. This should be a problem with the SPI master.

    Bryan Lizon86 said:
    Are you connecting the EVM through a USB hub instead of connecting it directly to a computer?

    I will check this with the customer.

    Regards,

    Amy

  • 0 in reply to Amy Luo
    TI__Mastermind 40191 points

    Hi Amy,

    Thanks for the additional information, please let me know what the customer says about the USB hub. 

    It is odd that there is no communication at all from the GUI, even though the hardware shows "Connected" in the GUI

    -Bryan

  • 0 in reply to Bryan Lizon86
    TI__Expert 6895 points

    Hi Bryan,

    The user said they did not through the USB HUB and were connected directly to the PC.

    Yes, shows "Connected".

    Regards,

    Amy

  • 0 in reply to Amy Luo
    TI__Mastermind 40191 points

    Hi Amy Luo,

    Are the LEDs on the PHI controller board lighting up as described in Section 2 in the A04 EVM user's guide?

    Have you probed all of the various pins to check if the voltages are correct (AVDD, IOVDD) as well as the EVM crystal is oscillating at the correct frequency? You should be able to probe at the CLKIN pin to check the crystal

    Do you have another PHI controller card to test with this EVM? Or can you test this PHI controller card with a different EVM to determine if the PHI was damaged?

    The USB voltage is low, but I believe it is still within specification

    -Bryan

  • 0 in reply to Bryan Lizon86
    TI__Mastermind 40191 points

    Hi Amy Luo,

    I tried to see if I could mimic this behavior with my A04 EVM, which was brand new (never used) and had all of the default jumper settings.

    When I plug in the EVM and open up the GUI, I see the activity shown in the logic analyzer capture below. Does the customer see this behavior when they start up their EVM?

    The last three data transfers are issuing the following commands: UNLOCK, WREG to register 0x0F that turns on all ADC channels, followed by an UNLOCK command. I included this data in the second image below

    I was able to successfully take data after this time

    -Bryan