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angus123
Graduate
June 20, 2025
Solved

RFID IC with energy harvesting, user data, wake-up signal to MCU

  • June 20, 2025
  • 1 reply
  • 405 views

Hi There,

 

I am developing a product where I need to remotely wake up my electronics from 0.5-1.5 m, and also read back some user information about the unit I just woke up (e.g. serial number, firmware version the MCU is running etc). It needs to be as low power draw as possible while asleep.

 

I was thinking that RFID could be a good candidate for this, with an IC that can harvest RF energy to output a signal (gpio or just output voltage/current based on harvested energy) that I can use to wake my MCU. It can also send back user data to the scanner such as firmware version and serial data. Given my range, I was thikning that UHF is the most appropriate (correct me if I am wrong here).

 

Does STM have any products that suit my needs? I was looking at the STM25DV04KC, however being in the HF range, I am concerned I will not get the range that I require. If it could, what size of antenna would I require to get 0.5-1.5m wake range? If it cant, do you have any other recommendations?

 

Thanks in advance :)

 

 

    This topic has been closed for replies.
    Best answer by Berenice BENVEGUDA

    Hello @angus123 

    First of all thanks for your interest for ST25 product family !

    Then, additional details abut your use case/system capability would be necessary to advise you.

    Nevertheless, in a first approach, to have a chance to reach such detection distance, at reader side an antenna size  in the range of 80x60 cm providing a power of several watts, and at tag side  an antenna in the range of a credit card at least would be necessary.

    ST25DV04KC could be a candidate with its GPO configured as wake up interrupt.

     

    I hope this helps,

    Best Regards,

    BB

    1 reply

    B
    Berenice BENVEGUDAAnswer
    Technical Moderator
    June 23, 2025

    Hello @angus123 

    First of all thanks for your interest for ST25 product family !

    Then, additional details abut your use case/system capability would be necessary to advise you.

    Nevertheless, in a first approach, to have a chance to reach such detection distance, at reader side an antenna size  in the range of 80x60 cm providing a power of several watts, and at tag side  an antenna in the range of a credit card at least would be necessary.

    ST25DV04KC could be a candidate with its GPO configured as wake up interrupt.

     

    I hope this helps,

    Best Regards,

    BB

    A
    angus123Author
    Graduate
    June 23, 2025

    Hi Berenice,

    As I suspected, those are far too large for my application. I need to use UHF to reach my required range while remaining small enough to be practical, which ST unfortunately does not provide. Thanks for your help!

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