Ask questions and find answers on ST25 NFC/RFID tags and readers, including connectivity implementations and antenna design.
Hello,I have an ST25DV64KC chip and I’m having a problem with I2C read/write. The I2C bus is running at 100 kHz and is functional (communication with another sensor, SHT, on the bus works fine). I am also able to communicate with this NFC chip - I ca...
I have successfully integrated a ST25R100 NFC reader with an ST25DV04K tag. Reading and writing data works perfectly.But once you enclose the system in its housing, writing doesn't work, even though reads still succeed.I presume this has something to...
Hi, I'm trying to measure X-Nucleo-nfc03a1 with VNA: i got completely different values for C11 C22 and C2 as is on nucleo board. I understood something wrong? and when I remove Resistors 330ohm, inductor and 4 100pF capacitors I got like:
Hello,I am using the ST25R3918 controlled by an MCU via RFAL, operating in NFC-F / FeliCa card emulation mode.I am monitoring the efd_o bit (bit 6) of the Auxiliary Display Register (Address: 31h) to detect when the board approaches an external reade...
Hi, I have been working on a project that is based on the ST25R3911b Discovery Board including building prototype firmware from the discovery kit's firmware. I have made sure not to edit any of the RFAL or HAL library files.Recently I had brought thi...
Hello people. In 2020, our company made a PCB prototype (designed by me) which included a chip " ST25R95-VMD5T ". Our results were not good, but maybe this was due to a poor filter circuit and due to a poor matching circuit. The tag reading distance ...
Hi everyone,I’m trying to interface an ST25R100 NFC reader with my MCU, and I’m having trouble reading ISO15693 tags. My initialization seems to work, but I never get any response from the tag. I’m hoping someone can spot what I might be missing.This...
Hi,I am using the X-NUCLEO-NFC09A1 with the demo project “ST25R200_v3.0.0_Linux_demo_v1.0”.The code is running on a Raspberry Pi 3B and communicates with the reader via SPI.When I run the demo and place an NFC tag near the reader, the application rep...
Hello,I got back to my issues from this post.I was able to connect wires to SPI lines, and get the measurements to logic analyzer. These are the results:Logic2 screenshot Now i can see that the issue is the CS line, but i dont know why it is being ch...
Hello everyone,I am developing an iOS application using the ST25SDK (converted/wrapped for Swift) to interface with the M24LR16E-R Dynamic NFC Tag.I am facing a blocking issue where any attempt to call readBytes() (which is used in TagReadMemoryGenVi...