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using Battery and RAM with NFC/RFID Temperature Sensing Patch

omar s65
Prodigy 30 points
Other Parts Discussed in Thread: RF430FRL152H, RF430CL331H, TIDA-00524

hello , I need help to develop small system  using  NFC/RFID Temperature Sensing Patch . the system must have a small battery to last at least 6 weeks and to recored TEMP with sampling rate 1 measure per mint and save the recorded temperature on an internal memory . then top request i can retrieve the stored data for the memory via NFC.

the whole system must be very small and compact in order to fit a small capsule in a patient mouth. 

I would like to have one of the IT engineers  to guide me through this application and design .

thank you 

  • 0
    TI__Expert 7820 points
    Here are some summary notes:

    RF430FRL152H
    + size - single chip system
    - battery life: 1.5V silver oxide battery will likely not last 6 weeks
    data will have to be read out often, about every 7 hours before the FRAM is full
    if NFC is needed (over RFID ISO/IEC 15693) this will take more of the FRAM and the logging memory will be reduced

    MSP430 FRAM (64k) MCU + RF430CL330 or RF430CL331H
    - size - two chip system is necessary
    + battery life - 6 weeks or more is possible, however battery will need to be 3V
    64k of FRAM - 4k for code and 60k for data allows 6 weeks of logging memory
    Please check this reference design: www.ti.com/.../TIDA-00524
  • 0 in reply to Alex K.
    Prodigy 30 points

    Thank you for your notes 

    i already looked at TIDA-00524 as an option , however i have few main concerns:

    1) I would like to have flexible board if possible

    2) minimum minimum minimum  size and thickness of the board is needed   .. the whole system will be coated and covered by polymer matrix  material and implanted in a artificial set of teeth (denture) in the patient mouth.

    3) the system will be (hided) and covered inside the denture... so the data must be read wireless.... a socket or a wire will not be an option.

    please give me notes .

    omar  

  • 0 in reply to omar s65
    TI__Guru*** 135355 points

    Hello Omar,

    The flexible board should be possible, but the minimum size will be hard to meet for what you are describing. You wouldn't need a wire or socket for either application.

    These are the only possible solutions available that we can offer. It is up to you to determine based on the TI design collateral and information about the parts whether you can achieve this use case.

  • 0 in reply to Ralph Jacobi
    Prodigy 30 points
    hello Ralph
    if you build a flexible board customised for me and you re squeeze all the components …...can you give me approximate estimation of the broad with battery and ram with maximum squeeze in size ? .. this board will be used in a research for patients with bacterial problems in mouth ……so i think it will be very important for your company to e mentioned in journals and conferences that the electronics parts were designed by TI .

    thank you again
  • 0 in reply to omar s65
    TI__Guru*** 135355 points
    Hello Omar,

    That isn't something we can do. There is too much variance for me to ever offer a general estimate given the wide variety of MSP430 FRAM devices which would fit your application that would need to be selected from based on memory requirements and layout size (as you must account for required passives as well the chip packaging), plus there's the battery form factor and any possible concerns with medical governing bodies such as the FDA with how devices need to be encapsulated that could in turn effect the required antenna dimensions.

    We appreciate your effort to have TI involved in such studies, but we cannot commit engineering resources to such a design.

    The best we can offer is our take on the application challenges as Alex and I have mentioned above, and the existing TI reference design collateral for our products.