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Preetha Muralidharan
Visitor II
June 19, 2018
Solved

ST NFC reader module

  • June 19, 2018
  • 2 replies
  • 1787 views
Posted on June 19, 2018 at 18:13

Looking to use ST NFC reader module for reading the tags and the reader must be able to send an unmodulated signal (carrier only at 13.56MHz). I also need to able to see the demodulated signal at one of the pins on the evaluation module. Is there any module that is available ? I am currently using EVAL-ST95HF but unfortunately not able to see the demodulated signal anywhere on the board. Any input on this is much appreciated.

    This topic has been closed for replies.
    Best answer by Ulysses HERNIOSUS
    Posted on July 10, 2018 at 16:19

    Hi Preetha,

    As I have already told you: the disco does not have support for the transparent mode. It can send the 0xdc command but that leaves the chip only for a very small moment in that mode until it drives /SS high again. If you want to use that then you have to write your own FW.

    Once more: Depending on what you actually want to receive an option may also be the so-called observation modes on CSI/CSO.

    If you can provide some more infos on what you actually would like to achieve I may be able to give you more elaborated information.

    Regards, Ulysses

    2 replies

    U
    Ulysses HERNIOSUS
    Technical Moderator
    July 2, 2018
    Posted on July 02, 2018 at 17:03

    Hi Preetha,

    All data the ST95 receives is put after chip-internal demodulation and decoding into buffers where it can be read via UART/SPI. The CR95 and ST95 are not meant to be used as pure analog frontends. 

    Regards, Ulysses

    P
    Preetha MuralidharanAuthor
    Visitor II
    July 2, 2018
    Posted on July 02, 2018 at 17:08

    Hi 

    Ulysses,

    Can you suggest a reader module which I could use?

    Thanks,

    Preetha

    U
    Ulysses HERNIOSUS
    Technical Moderator
    July 3, 2018
    Posted on July 03, 2018 at 08:27

    Hi Preetha,

    ST25R3911B can do this: It has a so called transparent mode where you can change the role of the SPI pins to output digitized demodulated signal / receive digital modulation signal. Maybe this is what you are looking for. If you can provide some more infos on what you actually would like to achieve I may be able to give you more elaborated information.

    Regards, Ulysses

    P
    Preetha MuralidharanAuthor
    Visitor II
    July 4, 2018
    Posted on July 04, 2018 at 18:01

    Hi Ulysses,

    Thanks for the suggestion. I am looking to program the module to send just the carrier signal (13.56 MHz) and turn off the modulation. Can I do that using the PC software provided for this module?

    Thanks,

    Preetha

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