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TIDA-01580: TIDA-01580

Dominique Dunlap
Prodigy 250 points
Part Number: TIDA-01580
Other Parts Discussed in Thread: CC2640R2F, , AFE4900

Can you use the photodiode on the chest for pulse oximetry, say next to the ECG? Instead of using a finger, could it also retrieve values if placed on the chest?

  • 0
    TI__Genius 12845 points
    Hello Dominique,

    Thank you for reaching out. The simple answer to your question is "Yes".
    The PPG values can be retrieved from chest, but the quality of the PPG signal will vary compared to wrist.
    For example, for 1mA LED current (through Green LED) will give ~20mV at wrist, but only ~3mV at forehead. We don't have any data for chest amplitude though.

    So for extracting signal from chest, you would need better filtering, algorithm and processing of PPG signal.

    What is the application are your targetting? is it a patch?

    Regards,
    Sanjay R. Pithadia
  • 0 in reply to Sanjay Pithadia
    Prodigy 250 points

    It is a patch, and i love your designs for these wearables. I saw a design that you guys had for a multiparameter wearable, and I wanted to incorporate this (PPG) into the multiparameter wearable, that would give, ekg,  ppg, accelerameter, temp, motion sensing,there also is a respiratory curcuit that i would use for gathering respiration. What do you think the biggest hiccup to a wearable that gathers all of this data?

  • 0 in reply to Dominique Dunlap
    TI__Genius 12845 points
    I believe, with all these data, the memory size requirement will be huge. If you are planning to use internal memory of the MCU, please check the size before finalizing the MCU. You might need external memory.
  • 0 in reply to Sanjay Pithadia
    Prodigy 250 points
    I believe the MCU i will be using will use FRAM, How much do you think I will need to incorporate such a load?
  • 0 in reply to Dominique Dunlap
    Prodigy 250 points
    and also which MCU's do you recommend for such a heavy load?
  • 0 in reply to Dominique Dunlap
    TI__Genius 12845 points
    It really depends on whether you want to do algorithms and processing in controller or not. AFE4900 EVM uses MSP430F5529IPN, which is used for some processing before data goes to LabView GUI. TIDA-01580 uses CC2640R2F, which has to also consider the BLE stack.

    For the parameters which you mentioned (ekg, ppg, accelerameter, temp, motion sensing, respiration), you will need much higher memory than TIDA-01580 (as it just measures ECG & PPG).

    If you can calculate and mention memory size, I may be able to suggest you some good MCU devices.

    Thank you.