• State Resolved
  • Locked Locked
  • Replies 7 replies
  • Subscribers 48 subscribers
  • Views 472 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

ADS1292R Resp. mode influence and ASD1292RCG-FE NAND

Tamás G. Barna
Prodigy 50 points
Other Parts Discussed in Thread: ADS1292R, ADS1292, ADS1298, ADS1292RECG-FE

Hi,

We are about to desing a product around ADS129x, probably ADS1292R, and before making the decision, as we are before the feature  freeze state I have a few questions that I hasn't been able to figure out so far.

According to the datasheet of ADS1292, Figure 56. Typical Respiration Circuitry, it is possible to use this IC with only 2 electrodes (and an optional RLD), and acquire 1 channel ECG and Respiration measurements at the same time. Am I correct?
If so, my question is that does it affect in any way my ECG signal in this configuration and if so how much? Or is it adviced to use 2 seprate electrodes and in what configuration for Respiration? I was only able to found the http://e2e.ti.com/support/data_converters/precision_data_converters/w/design_notes/ads129xr-respiration-design.aspx wiki page, but it wasn't clear enough for me at first glance.

We also want to use a pace detection circuit, and I know that a app note is in progress at your side, can you give me a quick update about its current state. As we have our own version with a different configuration and we'd like to be sure before making the first prototypes and testing them that it doesn't interfere in any way with our signal quality. Probably not, but to be sure.

And a bonus one: I know that there is a 1GB Micron ONSI NAND Flash memory on the ADS1292EECG-FE dev. board (next to an unimplemented mircoSD card option). Does it manage properly the blocks and wear leveling in software out of the box or do we need to add these funciton to it?
I'm quite curious as I hasn't been able to decide between NAND Flash and microSD card as both has there advantages and disadvantages.

Kind Regards

  • 0
    TI__Guru**** 180801 points

    Hi Tamas,

    We're putting together a response to your first ADS1292 questions now, however, regarding the 'bonus' question - can you clarify what you mean when you ask if the NAND: 'Does it manage properly the blocks and wear leveling'?

  • 0 in reply to Tom Hendrick
    Prodigy 50 points

    Hi Tom,

    First of all, thank you for your support, I'm pleased to be able to consult with TI professionals about my development questions.

    Regarding my 'bonus' question, I meant that the Micron MT29F8G08ABABAWP:B mounted on the ASD1292RECG-FE developer board only has ECC (Error Checking & Correction) built in, but wear leveling and block management should be implemented in software, at least as far as I know. Please correct me if I'm wrong. I've read its datasheet (page 93) and then found the following article: http://www.eetimes.com/design/memory-design/4216897/Software-and-hardware-challenges-due-to-the-dynamic-raw-NAND-market?pageNumber=1 . That is the reason I'm asking you about these, whether these are implemented in the example code or not.

    A little off topic note, but in a microSD card, it's not a problem, since these are all managed by the card itself. But I want to be sure how much extra work does the use of NAND flash mean for us. Especially since we are looking at the same Micron NAND Flash memory family, which would mean bigger integration and smaller costs.

    Thank you again for helping and I hope that my questing is more clear to you. In case you need additional information regarding my questions, feel free to ask as I'm already grateful for you assistance.

  • 0
    TI__Mastermind 43915 points

    Hi Tamas,

    We are in early stages of the Hardware PACE circuit app note and short presentation so it may take some time to get it out. Here is the circuit which we can use with the ADS1298 using the PACE output amplifiers. The idea is to use a slope detection method to look for the PACE signal and then latch a bit when it is there. This is designed to let the user know if the PACE signal is there rather than digitizing the PACE signal. We will be putting together some sort of collateral to explain this in  more detail, but in the meantime, the schematic is attached.

    Regards,

    Tony Calabria

    ExternalHWPace.pdf
  • 0 in reply to Tony Calabria
    Prodigy 50 points

    Hi Tony,

    Thank your for the schematics and sharing your view of the solution. As soon as I'll have enough time or when we'll discussing this subject in more dept I'll share our thoughs too, as I'm just really connecting in to ECG development now.

    Kind regards,

    Tamás G. Barna

  • 0 in reply to Tony Calabria
    Prodigy 50 points

    Hi Tony,

    Can you also give me an answer about my first question too? 

    'According to the datasheet of ADS1292, Figure 56. Typical Respiration Circuitry, it is possible to use this IC with only 2 electrodes (and an optional RLD), and acquire 1 channel ECG and Respiration measurements at the same time. Am I correct?
    If so, my question is that does it affect in any way my ECG signal in this configuration and if so how much? Or is it adviced to use 2 seprate electrodes and in what configuration for Respiration? I was only able to found the http://e2e.ti.com/support/data_converters/precision_data_converters/w/design_notes/ads129xr-respiration-design.aspx wiki page, but it wasn't clear enough for me at first glance.'

    Kind regards,

    Tamás G. Barna

  • 0 in reply to Tamás G. Barna
    TI__Mastermind 43915 points

    Hi Tamas,

    The ADS1292RECG-FE board was designed such that you could do ECG and respiration from the same two electrodes. I recommend reviewing that schematic in the UG. Keep in mind that R16 is installed in the ADS1292R version while R85 is left open. You will notice in this configuration that the same two electrodes are routed to both channels. You will need to use channel 1 for respiration and channel 2 for ECG.

    Regards,

    Tony Calabria

  • 0 in reply to Tony Calabria
    Prodigy 50 points

    Hi Tony,

    Thanks you for your answer, we are looking forward to the arrival of the dev. board and firing it up.

    Kind regards,

    Tamás G. Barna