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ADS131E04: Malfuntioning after the dip in voltages

Sandeep NS
Intellectual 390 points
Part Number: ADS131E04

Hi,

If any dip in the DVDD(3.3V) is happened to the IC, malfunctioning happening the timing. 

above waveform shown the dip pattern for the IC. It lasts for only 80mS. and one more observation is the system behaves incorrectly if the dip lower peak is in between 0.9V to 1.1V.

Beyond this range the ADC is behaving correctly. What can be the Issue for this?

  • 0
    TI__Guru 62575 points

    Hello Sandeep,

    Thank you for choosing the ADS131E04 and for contacting us.  Unfortunately your image did not make it through, could you please re-attach it using the "Insert File/Image" button.  Copy/pasting directly into the editor unfortunately does not work.

    Regarding the question, the minimum operating voltages of the ADS131E04 are listed in Table 7.3 to be 2.7V and 1.7V for the AVDD and DVDD supplies respectively.  Operating at supply voltages lower than these levels can cause unexpected operation.

    Our ADS131E04 expert is returning to the office tomorrow and will help get to the bottom of what's going on and possibly some solutions to mitigate the voltage dips.

  • 0 in reply to Collin Wells
    TI__Guru* 93265 points

    Sandeep,


    As Collin had mentioned, can you please put up the waveform? Again, you'll need to use the picture icon to insert images, ctrl-c/ctrl-v won't work for copy and paste.

    Also, what malfunctions are you seeing when these dips in the DVDD occur? It would help to know if communications are working, if the register values are correct, and if the data has errors.

    What Collin talked about in his post was that if the supplies go below the minimum, it can result in unexpected operation. In the device, the AVDD and the DVDD have a power-on-reset (POR) circuit. Ideally if the supply is below a certain level, the device is held in reset. Once the supply reaches a threshold the reset is released and the device becomes operational.

    However, if supply drop isn't low enough, or if the drop is too short or intermittent, the POR may not get triggered, but digital may experience some brownout, registers are disrupted. In that case, a RESET (either by pulling the /RESET pin low, or by sending the command) is needed to reset the device.


    Joseph Wu

  • 0 in reply to Joseph Wu
    TI__Guru* 93265 points

    Sandeep,

    I haven't heard from you for a while, so I thought I'd check in and see if you had any more comments about your problem with the device. As I mentioned in my last post, the power supply could be dipping below the POR level and causing the device to reset. This may also lead to other issues with the digital registers being disrupted.

    I'll close this thread for now, but if you are continuing to have these problems, post back and we can continue to work on this issue.

    Joseph Wu