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ADS1299EEGFE-PDK: Waveform cannot be displayed

kenichi takahashi
Prodigy 110 points

Part Number: ADS1299EEGFE-PDK
Other Parts Discussed in Thread: ADS1299,

Tool/software:

I'm trying to get the ADS1299 evaluation board to work.

I'm reading the ADS1299 User's Guide (slau443b) and installing the following on my PC:

ADS1299EEGFEFirmware-1.0.2-installer

ADS1299EEGFESoftware-1.0.2-installer

ADS1299EEGFE-PDK-SW-installer

I'm running the ADS1299ECG-FE Evaluation Software, but the USB port on my PC isn't recognized.

Therefore, I don't think the signal input to Channel 1 is displayed.

What else can I do to get the port recognized? 

  • 0
    TI__Guru 68326 points

    Hello Takahashi-san,

    I saw your other post - did you manager to resolve this issue? If not, can you check Device Manager and show us how the EVM is enumerating when plugged in and powered on (before starting EVM software)? Only the "-PDK-SW" software is needed.

    Regards,

    Ryan

  • 0 in reply to Ryan Andrews
    Prodigy 110 points

    ADS1299EEGFE-PDK_Waveform cannot be displayed.xlsx

    I checked the status in the device manager.
    There were some changes in the EVM connection, but is this OK?
    Also, does any setting need to be made on the ADS1299EEGFE-PDK-SW?
    Will a waveform appear if the register settings are correct?

  • 0 in reply to kenichi takahashi
    TI__Guru 68326 points

    Hello Takahashi-san,

    It looks like the EVM is powered on and connected to the PC correctly. Can you try to follow the EVM User Guide and capture the square wave test signal waveform? Please refer to section 5.3.1 of the User Guide (page 21). More details can be found in the data sheet page 31 (section 9.3.1.1.2) and the CONFIG2 register.

    Regards,

    Ryan

  • 0 in reply to Ryan Andrews
    Prodigy 110 points

    Hollo Ryan Andrews-san

    I'm relieved to hear that the USB connection seems to be working.

    As advised, I changed Configuration Register 2 and checked using a test signal.

    However, it doesn't show up in the "Scope."

    It does seem to show up in the ”Histogram”.

    Is it displayed?

    0474.ADS1299EEGFE-PDK_Waveform cannot be displayed.xlsx

  • 0 in reply to kenichi takahashi
    TI__Guru 68326 points

    Hi Takahashi-san,

    Currently, you have all channels configured to measure Normal Electrode input. You must set one of the channels to receive the internal test signal through the input MUX. For the desired channel, set CHnSET[2:0] = 001b.

    Regards,

    Ryan

  • 0 in reply to Ryan Andrews
    Prodigy 110 points

    Hollo Ryan Andrews-san

    I was able to confirm that it can be displayed using a test signal.

    I will consider the bias and signal input method.

    Thank you.

  • 0 in reply to kenichi takahashi
    Prodigy 110 points

    Hollo Ryan Andrews-san

    With "Single-Ended Inputs," the signal was buried in hum noise (AC power noise) and was not visible.

    When I set it to "Differential Inputs", a sine wave 20Hz/10uV input waveform was displayed as shown in the attachment.

    The evaluation board setting is "Unipolar Analog Supply: 5V.

    " Is there a way to add a "power supply voltage center bias" inside the "ADS1299"?

    Is "Bipolar Analog Supply" the only option?

    6332.ADS1299EEGFE-PDK_Waveform cannot be displayed.xlsx

    I also tried the "Notch filter" that appears in "Scope," but it had no effect on the displayed waveform.

    How do I use it?

  • 0 in reply to kenichi takahashi
    TI__Guru 68326 points

    Hello Takahashi-san,

    The ADS1299 features an internal BIAS amplifier and mid-supply BIASREF voltage. You can set CONFIG3 (03h) to 0xEC to configure the amplifier as a buffer with mid-supply common-mode voltage. In EEG applications, this bias voltage establishes the common-mode voltage on the body.

    On the ADS1299EEGFE-PDK, the output of the BIAS amplifier is connected to JP1[2]. You can remove the jumper and connect BIASOUT to your function generator if it has an input connection for "DC offset." Is that possible? 

    If shifting the function generator output is not possible (i.e. DC common-mode = GND), then I recommend setting the ADS1299 supplies to ±2.5V. If measuring a single-ended signal, connect INxN to GND.

    Regards,

    Ryan