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TIDA-00524: Using the data logger in passive mode

Aladdin
Prodigy 150 points
Part Number: TIDA-00524


Hello,

I wanted to use the data logger TIDA00524 in passive mode. I populated the Schottky diodes and the 100uF capacitor to use the data logger in passive mode. I didn't find an example code in TI website for collecting the data from the sensors in passive mode. I want to know if it is possible to collect data from the sensor in passive mode (the sensors get powered up from the reader to retrieve the data back). I wrote a code to only read hello message from the FRAM. 

Please let me know if this is possible or not to retrieve the data from the sensors . also, some hints on how to do it if it is possible

Thank you a lot  

  • 0
    TI__Expert 5695 points
    Hi Aladdin,
    This design may not support passive mode. Will forward it the release team and they will contact you on Monday, US business day.
  • 0 in reply to Jose Arteaga4
    TI__Expert 7855 points
    Aladdin,

    I would recommend performing some power calculations first. You need to determine the required current draw from the circuit and the time it takes to perform the measurements. From there, you can back calculate the capacitor requirement to bias your circuit within that time and also determine if the NFC can charge up your system.

    My advice would be to break the problem into smaller steps and solve one at a time. If the problem is complicated then simplify it by making some assumptions so you can ball park the solution. Once you think it's plausible then increase the problem complexity to get a more accurate picture.

    -Kelvin
  • 0 in reply to Kelvin Le THS
    Prodigy 150 points
    Thank you a lot Kelvin.
    I was hoping someone did something similar before, but I guess I have to figure it out by testing the power consumption. Anyway, what about the interrupts, how I can make the measurements done while an NFC reader trying to read the data logger TIDA00524, which interrupt can react to that.
    Thanks again
  • 0 in reply to Aladdin
    TI__Expert 7855 points
    Aladdin,

    My recommendation was to calculate the power consumption to get a ballpark of the power requirements. You can also empirically test the typical power consumption by measuring the current draw from the battery. I briefly looked at the datasheet and found the interrupt pin called INTO. You might want to do some more reading on this. Take a scope shot of the current measurement around this interrupt trigger would provide useful information.
    For more detailed RF430 questions, I would recommend posting in a different thread and the appropriate expert will contact you.

    -Kelvin