ST25 NFC/RFID tags and readers

Ask questions and find answers on ST25 NFC/RFID tags and readers, including connectivity implementations and antenna design.

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Forum Posts

ST25R3911B SPI Issues on custom board

Hello,I developing a board with ST25R3911B and STM32F103RFT6. Im trying to read Chip ID, but it always reads 255. On the scope i can see CS pin driven low, clock and MOSI line outputing signals, but no response on the MISO line. The solder joints loo...

qwdwdwwq_0-1763032156656.png qwdwdwwq_2-1763032249075.png qwdwdwwq_3-1763032803170.png 20251113_121747.jpg
qwdwdwwq by Associate II
  • 100 Views
  • 5 replies
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ST25R3920B discovery board

Hi I am planning to evaluate the ST25R3920B for NFC reader applicaiotn in automotive.I only find STEVAL-25R3916B kit on your website, based on your presentation file, this kit is also valid for ST25R3920B, it is right?if not, where can I find the sui...

LeoWu by Associate
  • 75 Views
  • 2 replies
  • 0 kudos

ST25DVCryptoDemo iOS not working

Hello @all, I've downloaded ST25DVCryptoDemo for iOS from here, in order to take a look into the demo code for a new project.Once I've tried to build the Demo app I've got a big amount of errors. In fact the console gave me this message "too many err...

Screenshot 2025-10-06 at 12.16.17.png
Andrea123 by Associate II
  • 1057 Views
  • 27 replies
  • 2 kudos

Resolved! ST25R3911B capacitive wakeup guidance

I am finding it difficult to get clear direction on best practices for how to do the layout for CSI and CSO.  App note AN4985 says that "parasitic capacitance to ground should be made as small as possible", and then recommends using a coupling capaci...