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TIDA-00524: Low voltage detection using NFC

Ahsan Noor Khan
Prodigy 180 points
Part Number: TIDA-00524
Other Parts Discussed in Thread: MSP430FR5969, RF430CL331H, TMP112, MSP430G2403, RF430CL330H, TIDA-00721, TMP116

Hi,

I am doctoral student at Queen Mary University of London. I have developed the dual parameter (Temperature and Pressure) sensor using semiconductor materials. The sensor is producing output voltages when it is placed over the human hand. The range of output voltage is 3 - 5 mV DC. The sensor works on the principle of temperature gradient between the sensor and human hand, thus detects the temperature of human body.

I need demonstration setup for my sensor. For instance, I am interested to sense the output voltages produced by my sensor and then storing  it in the memory. The data will then transfer to an NFC transmitter and a reader (For instance, Mobile) can read the voltages through wireless connection. It can also be a RFID system.

I was seeing the product of TIDA-00524. It has built in sensors and requires high input voltage (2.2 - 3.6 V). However, My sensor is producing only 3 - 5 mV. Can someone please help in building a demonstration setup for my sensor ?

Thanks and Best Regards

  • 0
    TI__Mastermind 36940 points

    Hi Ahsan,

    I wasn't sure what your intention is. Unfortunately, that the only TI Design we have. I'm sorry we can't help you a buidling a demonstration.

    Aaron

  • 0
    TI__Genius 15760 points
    Hi Ahsan,

    I believe you are confusing the sensor voltage output with the system power supply in the TI design. The 2.2 V to 3.6V voltages are the operating power supply range of all the sensors in the board, not the output voltage of the sensors.

    I worked on this TI design, I might be able to help you with some recommendations for your setup. Please share with me the block diagram of your system and we start from there.

    Thanks for using TI E2E forums!
  • 0 in reply to Mayrim Verdejo
    Prodigy 180 points

    Demostration.pdfHi Mayrim,

    Many thanks for your message and I hope to get much help from you. I try to explain here.

    Actually, we have developed a self powered flexible sensor with P Type semiconductor material. The sensor produces 3-5 mV DC  when placed on the human body. It is due to temperature difference between the sensor and human body.  The output power is approximately 1 nW.

    Now the idea is to use TIDA-00524 design (or it can be anyother design) to send these voltages through a wireless connection to a Mobile or computer (Bluetooth or RFID ?). In conclusion, we need to demonstrate sensed voltages wirelessly.

    Now what questions I have

    1)  The TIDA-00524 has builtin temperature sensor. However, we have our own sensor. So how to incorporate our sensor in the TIDA-00524 ?

    2)  Do we need to amplify our sensed voltages using some instrumentation amplifier ?

    3)  How to convert, For instance 3 mV DC in to digital format to store in memory ? TIDA-00524 can do it ?

    4) Can you develop a customized system for our demonstration ? We can then purchase it from you

    I have attached the presentation of our proposed setup and will be grateful to you for your feedback and help. Please let me know if you need further information from my side.

    Best Regards,

    Ahsan

  • 0 in reply to Ahsan Noor Khan
    TI__Genius 15760 points

    Hi Ahsan,

    Thanks for sharing your system description, I understand it better now.

    Let me answer your questions:

    (1)   The TIDA-00524 has a build-in temperature sensor TMP112. This device is an IC digital output temperature sensor with an I2C interface.  The digital output from each temperature measurement conversion is stored in the temperature register of the device. Then, this data is transferred via I2C to the built-in microcontroller. In this design, the MSP430FR5969 microcontroller communicates with all of the sensor devices via I2C interface. The MSP430FR5969 also communicates with the RF430CL331H NFC transponder via this interface.

    (2 and 3)  

    Your system is an analog output system; you will need extra steps to digitalize your signal before you communicate with the microcontroller. The output voltage requires external signal conditioning (amplification) and an analog-to digital converter (ADC). 

    I have found a TI design that might help you. The engineers use an analog output IC temperature sensor. In this design, the temperature is measured with the analog temperature sensor that interfaces with an analog-to-digital converter (ADC). After the temperature data is digitized, the data is sent to the MSP430G2403 microcontroller which stores the data and then sends it to the RF430CL330H NFC transponder. The RF430CL330H bundles the data into the NFC protocol and sends it to a NFC reader.

    http://www.ti.com/lit/ug/tidubt8/tidubt8.pdf

    In your application, you will need to amplify your 3mV voltage to meet the input range of the ADC. The ADC will digitalize your signal and send the data to the microcontroller (you might be able to find a MCU with an embedded ADC). The data will be stored on the micro built in memory and then send it to the NFC transponder via I2C communication.  All this requires will require experience with microcontroller programming.

    (4) I am sorry, but we do not have the resources to develop this for you. You already have the sensor (which is what we support), you will need to work on your signal conditioning and find some help with programming a microcontroller. You can always try to contact the MSP430 and NFC team for support questions. 

    Hope this helps,

  • 0 in reply to Mayrim Verdejo
    Prodigy 180 points
    Hi,

    Many thanks for your help.

    I have understand what you have said and shall try to arrange our measurement setup accordingly.

    Thanks and Best Regards,

    Ahsan
  • 0 in reply to Ahsan Noor Khan
    Prodigy 180 points
    In addition,


    I want to say that the TIDA-00721 Module is not available for purchase/order. Can you please tell me about its availability ?

    Thanks and Best regards,
  • 0 in reply to Ahsan Noor Khan
    TI__Genius 15760 points

    Hi Ahsan,

    I am glad was explanation was helpful! 

    Not all our reference designs are available for sale. This one is not available for purchase but we are sharing all design files with you so you can reproduce the design. 

  • 0 in reply to Mayrim Verdejo
    Prodigy 180 points
    HI,


    Thanks for your help. I am interested to buy TIDA-00524 Design for my future work. As I shall be doing research about Bio Sensors and Antennas for bod area applications.

    I am interested to know that can this TIDA-00524 work on human body ? I mean the built in sensors of TIDA-00524 are able to detect the temperature of human body ?

    Thanks and Best Regards,

    Ahsan
  • 0 in reply to Ahsan Noor Khan
    TI__Mastermind 36940 points

    Hi Ahsan,

    You are welcome to buy the TIDA-00524 available at TI Store or from Digikey and Mouser. Measuring a human skin temperature is very challenge. There are a lot of elements that you need to take into account such as where and which part of the body can be measured body temperature. The human body temperature is ~37°C but that is only for the internal core body temperature. The extremities, arms and legs, will exhibit lower temperatures due to their distance from the core. For this reason, measuring skin temperature on the wrist is challenging due its distance from the core body temperature. There are also layout consideration when you want to measure the skin temperature. What is the temperature precsion you are targeting to 0.1°C? Are you looking for a fast response time? These challanges should be considered when you want to design for your project.

    So, the TIDA-00524 doesn't designed for skin temperature measurment.


    Recently, we released a new digital local temperature TMP116. This device is great for measuring human temperature for body temperature range. If you are interested, please see the link below.

    www.ti.com/.../tmp116.pdf

    If you have further question, please let me know.

    Aaron

  • 0 in reply to Aaron Heng
    Prodigy 180 points
    Hi Aron,


    Thanks for your help. I shall look into the designs which you sent. I contact you for any further help.

    Thanking you in anticipation.

    Best Regards,

    Ahsan