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I
itzel
Visitor II
January 7, 2026
Question

ST25r100 Two single-eded antenna driving

  • January 7, 2026
  • 1 reply
  • 39 views

Hello, is there any additional documentation that supports this system diagram?

itzel_0-1767816403749.png

 

My project will have one antenna that will be an RFID tag whereas the other antenna will be reader. Can ST25r100 support this use case?

itzel_1-1767816492447.png

 

I'd like to have the ability to write to a card as well and it seems like only RFO1 and RFO2 will have the ability to do that function. is that correct?

 

Thanks!

    This topic has been closed for replies.

    1 reply

    U
    Ulysses HERNIOSUS
    Technical Moderator
    January 8, 2026

    Hi Itzel,

    ST25R100 does only support Reader/Writer mode. It does not support card emulation.

    For Reader/Writer mode you can connect either one differential antenna or up to two single-ended antennas. ST25R100 is only concerned about exchanging data modulated on the 13.56MHz carrier. If the commands are read commands or write commands or authenticate or something completely else is more or less a don't care for the ST25R100.

    BR, Ulyssses

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