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Dalik
Graduate II
September 28, 2023
Solved

NFC Reader ST25R95

  • September 28, 2023
  • 4 replies
  • 3541 views

1. NFC ST25R95 Can I process if I don't use the MCU to control?

2. Can I boot up voltage to 10V for pin TX1 and TX2 for differential pair?

Best,

Dalik

    This topic has been closed for replies.
    Best answer by Brian TIDAL

    Hi,

    I would recommend to use STM32CubeMX that will help you to define your clock tree for your MCU. 

    The STM32F030K6T6 is having a LQFP32 package where the OSC32-IN and OSC32-OUT pins are not present (thus it is not possible to use a Low Speed External 32.768 kHz crystal). 

    Depending on your application needs, you can clock your system either from the High Speed Internal (HSI) 8 MHz RC clock or from an High Speed External (HSE) 4-32 crystal (providing a better clock accuracy but of course with an impact on your BOM). See RM0360 Reference Manual §7 for the description of the various clock.

    Rgds

    BT

    4 replies

    B
    Brian TIDAL
    Technical Moderator
    October 2, 2023

    Hi,

    1. the ST25R95 is a slave device controlled by an host. Can you share more information on your use case?
    2. VPS_TX is limited to 5V. What do you mean by 10V on TX1 and TX2?

     

    Rgds

    BT

      D
      DalikAuthor
      Graduate II
      October 10, 2023

      1. I use it for charger power only, and I want to know if it can program directly to ST25R95 by not using MCU (host).

      best

      Dalik

      B
      Brian TIDAL
      Technical Moderator
      October 10, 2023

      Hi,

      as explained, the ST25R95 is a slave device. It needs to be driven from SPI.

      Rgds

      BT

      B
      Brian TIDAL
      Technical Moderator
      October 17, 2023

      Hi,

      The MCU_CLK pin may be use as clock source for the external MCU. The main use case is when using the transparent mode which is likely not your case (see https://community.st.com/t5/st25-nfc-rfid-tags-and-readers/mcu-clk-as-microcontroller-clock-source/td-p/232591 and other related posts. Se also the § Pin MCU_CLK in chapter 1.2.11 in ST25R3912 datasheet). 

      So I believe this pin is not needed in your application.

      Rgds

      BT

        D
        DalikAuthor
        Graduate II
        October 18, 2023

        Hi,

        Low price is first priority for developing my product, for a slave I have selected ST25R3912.

        1. Can you recommend ST chip as a host controller for a good price for the product?

        2. What is technical to switch the power mode output of the NFC module between 3V mode and 5V mode?
        Best,

        Dalik.

        B
        Brian TIDAL
        Technical Moderator
        October 18, 2023

        Hi,

        1. I would suggest to use the MCU/MPU selector from STM32CubeMX. This will help you to find the adequate MCU for your project based on several filter such price, Flash size (make sure to estimate your flash need), RAM size (same comment), IPs (SPI), number of IOs, etc.
        2. see § 1.2.10 in the ST25R3912 Datasheet: "The supply mode is set by writing bit
          sup3 V in the IO configuration register 2. Default setting is 5 V, hence this bit has to be set to
          one after power-up in case of 3.3 V supply."

        Rgds

        BT

          D
          DalikAuthor
          Graduate II
          October 20, 2023

          Hi, 

          In AN4974 (antenna matching network for ST29R391x device), In chapter 6.2.1 in Simulation S-parameter and Transition model, what is the tool used for simulation in this case?

          Dalik_0-1697767310388.png

           

          Best,

          Dalik

          B
          Brian TIDAL
          Technical Moderator
          October 20, 2023

          Hi,

          you can download the STSW-ST25R004 (Antenna Matching Tool for ST25R NFC/HF reader family) package to performs transient, AC, and S-parameter simulations of the calculated antenna schematic.

          Rgds

          BT

           

          P.-S. see also answer in your duplicated post: https://community.st.com/t5/st25-nfc-rfid-tags-and-readers/antenna-design-simulation-tool-for-st25r391x-devices/td-p/600128

          I would recommend to avoid duplicated requests. Thanks

          B
          Brian TIDAL
          Technical Moderator
          November 6, 2023

          Hi,

          it is recommended to avoid to duplicate post and to reuse already answered topics.  

          An answer will be provided in your other post NFC reader ST25R3916B EXT_LM pin.

          Thanks

          Rgds

          BT

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