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ADS1298: All settings and VCAP's look fine but no pulses

gyunal mustafov
Prodigy 20 points
Part Number: ADS1298

Hi All. I am in trouble with this device. more than a week I fight and result steel same.

This is custom board , have a little noise on supplies.

VCAP voltages :

VCAP1 : 1.2V

VCAP2 : 1.37V

VCAP3 : 4.68V

DVDD:  2.80V

AVDD: 2.77V

 (https://github.com/RobertCsordas/MobilECG-II) this design.

anyone can advice what have to check?

internal test signal

RLD, LL(CH3), LA(CH2), RA(CH2N-3N), and CH4 on chest.

  • 0
    TI__Mastermind 19815 points

    Hi,
    It's good that you can read the internal test signal.
    What do you mean by "no pulses"? Do you mean no ECG signal/waveform?
    Did you toggle the mux to normal electrode operation?
    What was the signal source? Can you try with a ECG simulator first and try only RA with (LA or LL) and make sure to connect the RLD electrode.
    did you enable the RLD Amp and supply the bias voltage to the RLD Amp?
    Try different gain settings.
    Thanks

  • 0 in reply to ChienChun Yang
    Prodigy 20 points

    I appreciate your response. Yang Chien-Chun

    ECG signal/waveform, indeed. I also tried different inputs into the mux and checked the registers again (MUXn[2:0]); MVDD, Temp, and shorted are all fine.

    I draw from my own body, but I plan to purchase a simulator the next week in order to identify any flaws in the program or design.

    I frequently verify the channel connection.

    Have you turned on the RLD amplifier and given it the bias voltage? (Yes).

    additionally employed gains. Today, I'll implement software selectable gain control for each channel on the PC side.


    Have you turned on the RLD amplifier and given it the bias voltage? (Yes).

    Note:

    when live electrodes floating nearly 2-3 meters around they read my movement in room. I am Shure that ADC and wire is fine.

    I used nRF24L01+ to transfer data and this module is not enough to transfer data more 500 SPS in low resolution mode with 2Mhz clock speed. if resolution is

    mater I will try it with direct USB connection. or just one channel data will send to pc.

    Thanks again.

  • 0
    Prodigy 20 points

    Hi . I would want to provide further details regarding my issue. I tackle it with a little care. Actually, there isn't a problem. The issue is that I try to display the data in a 200-pixel bar when I receive it. suppose that the data is between 1000 and 10.000 and adc range is 0 to 0x7FFFFF.  then seperate data 200/0x7fffff * data . result cant be visible

  • +1 in reply to gyunal mustafov
    TI__Mastermind 49666 points

    Hello,

    Instead of displaying in codes, you could convert it to voltage and display the data in the 200-pixel bar.