Ask questions and find answers on ST25 NFC/RFID tags and readers, including connectivity implementations and antenna design.
Hello,I’m working with an ST NFC tag (e.g., ST25DV) and noticed that when I add an NDEF record using the ST25 mobile apps, the system automatically adds a 4-byte Capability Container (CC) to the NDEF message record.My question is:Is there a way to a...
Hello,I’m working with the ST25R3911 NFC reader IC in a battery-powered application where ultra-low power consumption is critical.Is it allowed to completely switch off VDD_IO while VDD is still supplied (e.g., when the device is in Wake-Up mode)?Wil...
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 Sirs, I want to buy an NFC WLC evaluation kit similar to the one shown in the picture I posted. Where can I buy?
Hi,We have duplicated the design onto our own NFC tag, copying the same antenna design onto a flexi pcbWhat should be the tuning capacitor for this coil be for NFC ?If thats not available, what is the inductance value of the antenna so we can try and...
We programmed the ST25DV16 tag using the antenna and the GUI using the ST25R3919B. However, when we use the android apps to read the ST25DV16 tag its not getting read. The android apps read all the other tags of 13.56 mHz available in the market, but...
I am using the STEVAL 25R200 evaluation board for reading/ writing to/from NFC tag and using STM32CubeIDE for implementing the ndef example read and write (provided in the firmware folder of STEVAL 25R200). I have separately made NFC_read.c and NFC_w...
Hello, I am using the ST-25R200 ready-to-use NFC evaluation board for my application. I have already used the ST25R200 EVAL GUI software which functions without any problem. Since I want to develop my own software and integrate it for the applicatio...
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...
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...
