Ask questions and find answers on ST25 NFC/RFID tags and readers, including connectivity implementations and antenna design.
HiI am designing a small circular PCB with the following specifications. Due to size limitations, the antenna cannot exceed 9mm, which prevents me from achieving the recommended 4.8µH of inductance. Is it acceptable to compensate for this by increasi...
Hi ST team , I have designed NFC reader using ST25R3916B with single ended antenna connected with cable. Antenna is on different PCB. I would like to read ISO1443A tags using this antenna and want to have read range of around 5 cm. Right now when i ...
This is a custom-made PCB antenna board utilising the ST25R3911B chip, but I am unsure how to proceed with impedance matching debugging and parameter configuration. Could you offer some guidance? Below are the antenna dimensions, the calculated imped...
Hi, Every time I try to connect the eval kit to the GUI I get this error:This board doesn't reply properly to connect !Can anyone tell me how to solve this problem. I have made sure that the correct COM Port and baud rate is selected. Also, the powe...
Hello,I am currently trying to modify the schematic of the X-NUCLEO-NFC08A1 to support the connection of any commercial NFC antenna.From my understanding, I need to add a standard RF connector (SMA/U.FL/IPEX, etc.). Since commercial antennas are typi...
Hello, I am working on implementing the CR95HF RFID reader into a project, and I'm having some trouble with the external crystal starting; I'm wondering if anyone has had a similar issue. On my design I have the CR95HF connected to an NRF52840 MCU ...
Hi everyone!I am currently testing the reading of a tag with an ST25TV02K chip using two different readers. Both readers are based on the same NFC chip and use the same antenna coil, but they differ in the matching network between the NFC chip and th...
Hello, I am using STEVAL 25R200 board to read/write NFC tags. Currently, I am using NFC V type tag which is getting detedted by the EVAL GUI software as well as by the code I implemented using RFAL layer functions through Cube IDE. My tag UID as seen...
I am facing difficulties configuring the GPO interrupt on the ST25DV04KC to trigger exclusively when an NDEF message is written to the tag via the RF interface. The NDEF formatting is working correctly, and I am able to read and write data without is...
Hello, I am using STEVAL25R200 evaluation board and integrating read/write application using the ndef_read/write examples provided in the documentation embedded library. In my main function, I am Initializing the NFC using rfalNfcInitialize(), rfalNf...