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ECG cable for ADS1293 evm

Jay Yeh
Intellectual 465 points

Other Parts Discussed in Thread: ADS1293, CC2541, ADS1293EVM, MSP430F5529, ADS1192, ADS1292

Hi 

I would like to buy a ECG cable fit in the DB9 connector of ADS1293 evm.

I've looked similar evms like 1298 and 1292. The cables of corresponding evms are specified in the user's guides. But not in 1293.

Is there any source to get it?

  • 0
    TI__Expert 3835 points

    Hi,

    The ECG cable shown in the 1292 would also fit on the 1293 evm; the only drawback is that the cable does not have the chest electrode (V1). Here is the pinout of the DB9 connector on the EVM; you may find a different cable that matches these connections:

    PIN1:    RA
    PIN2:    LA
    PIN3:    LL
    PIN4:    RL
    PIN5:    V1
    PIN6-9: NC 

    Regards,
    Sergio 

  • 0 in reply to Sergio
    Prodigy 110 points

    Hi,
     
    Can You tell me what is characteristic of the cable that connects human body for ecg measurement and ads1293. Can that cable be just simple wires (shielded) or should those ecg cables fit somehow (by impedance maybe) with the ads1293 and/or human body?
  • 0 in reply to max3031
    TI__Expert 3835 points

    Hi Marjan,

    You can use shielded wires. The front-end of the ADS1293 consists of an Instrumentation Amplifier with a high input impedance.

    The difference in impedance between cables should be kept minimal, otherwise, common-mode signals (to some extent rejected by the CMRR of the ADS1293) would be converted to into differential signals and go down the signal path.

    Regards,

    Sergio

  • 0 in reply to Sergio
    Prodigy 140 points

    Hi Sergio. We've implemented cc2541 with ads1293 reference design and we used not shielded wires for connecting body electrodes to a PCB, approximately 1m. We used standard ECG conductive jel fitted pads. The problem we are facing is that we are getting somewhat noisy input on channel 3 and channel 2 and 1 only work if pads are hard pressed by hand. I was wondering what are specific requirements for the actual pads and the wires? Should they be shorter? Should they be really ground shielded? What kind of pads were used with 1293 for testing? Are there really specific requirements for them? What to do to minimise noise and boost channel 3 output? Thanks!

  • 0 in reply to oleg petrovsky
    TI__Expert 3835 points

    Hi Oleg,

    I don't have any specific requirements for the cables/pads. In general, shielded cables are better for interference. The ADS1293EVM is not intended to be connected to patients, so the testing was done with standard bench equipment and ecg simulators.

    To minimize noise, you could adjust the settings of the digital filters to reduce the bandwidth and make sure the right-leg drive feedback circuit is used correctly, having a dedicated electrode for the right-leg as in the example applications. You could also configure the INA and SDM for high-resolution and high-clock in register 0x13.

    Hope this helps.

    Regards,

    Sergio

  • 0 in reply to Sergio
    Prodigy 60 points

    At which pin of the ADS1293EVM do we connect the ground of the ECG simulator input?

    The schematics refer the numbers 10-11 for ground, but there are not such DB-9 pins.

  • 0 in reply to Alexandros Kogkas
    TI__Expert 3835 points

    Hi Alexandros,

    It looks like pins 10-11 are the two mounting pins found on the sides of the DB9 connector and they are connected to the chassis of the DB9 connector.

    Regards,

    Sergio

  • 0 in reply to Sergio
    Mastermind 7560 points

    Hi Sergio, Hi Alexandros,

    i am having the same problem with the ADS1293 EVM.

    I am using Pads ECG and cant measure any ECG signal.

    The only thing i see is a 50Hz Noise.

    How did you get it working?

    Thank you,

    Michael

  • 0 in reply to Michael Liesenberg85
    TI__Expert 3835 points

    Hello Michael,

    The EVM is not intended to be connected to patients because it does not have patient protection. For legal reasons, I cannot comment or give advise on this topic, but the community may be able to help.

    Regards,

    Sergio

  • 0 in reply to Sergio
    Mastermind 7560 points
    Hello Sergio,

    i got it working today. I had wrong settings.

    How can i get the ADC Sampel Codes from the ADS1293 GUI?
    The sampel codes from the Plot is not enought to anaylise it on Matlab.

    Can i get the GUI Source code?

    How can i "talk" to the MCU MSP430F5529 without using this GUI?
    I cannot find it on COM Port. The GUI uses a USB Driver to communicate.

    Regards,

    Michael
  • 0 in reply to Michael Liesenberg85
    TI__Expert 3835 points
    Hi Michael,

    There is an option in the MEASUREMENT tab to save the data into a text file (look for a blue disk icon) after the data has been captured.

    The GUI source code is not available and there is no straight-forward method for talking to the MCU without using the GUI. You would be looking at writing your own code for the MCU. The EVM is targeted for evaluation and not for development, this is the reason why it's less flexible.

    What I've read that other users have done (and you can search in the forum) is to bypass the on-board MCU and interface directly to the SPI interface of the ADS1293 with their own microcontroller or interface. Perhaps that is another option.

    Best regards,
    Sergio
  • 0 in reply to Sergio
    Prodigy 10 points
    Hi,

    Is the DB9 connector pinout of ADS1192 evaluation module same as that of 1292 evm?
  • 0 in reply to Vaishnavi Ramsali
    TI__Mastermind 38745 points
    Hello Vaishnavi,

    Yes the ADS1192 and ADS1292 EVM connectors are the same.

    Brian