ST25 NFC/RFID tags and readers

Hi,Comparison of STEVAL-ST25R3916B UM3033 [pg 22] & ST25R Antenna Matching Tool...Specifically the matching networks show a difference in location of parallel tuning capacitor relative to antenna connection. UM3033 antenna matching + filter [above].  Notice the location of the parallel tuning cap [C308] in relation to antenna connection ANT300. 

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 was very small, and the prototypes were not fixed (filter and matching), and we abandoned the project.  So in the same year of 2020, we were planning to make another PCB prototype, but then using the chip " ST25R3911B-AQFT ", with the intention that the reading of tags could reach a bigger distance, but we ended up not doing this prototype in 2020. Now, it's 2026, and we plan to make a PCB prototype, very simple. And our initial choice was the " ST25R3911B-AQFT ". I would like to ask if there are more recent chips than this, possibly one chip that can reach a bigger reading distance than this " ST25R3911B-AQFT ", or that reaches the

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 reader. While I observe that efd_o stays at '1' during the initial idle state and during the first few commands, it becomes unstable (toggling between 0 and 1) after the communication sequence is completed.Sequence of operations:Receive Write Without Encryption from the reader.Send response for Write Without Encryption.Receive Read Without Encryption.Send response for Read Without Encryption.Reader terminates the communication.efd_o becomes unstable (t

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 can read registers and read the chip’s UID correctly.The problem, however, is with reading/writing the user memory over I2C. When I try to write or read, I get NOK and the bus goes to low level and freezes. I have a main question:Q1. How is the memory actually organized? I know that the user memory has a 7-bit address of 0x53 and the system memory has an address of 0x57. I expected that the UID, which in the datasheet is listed under the System Configuration area, would be available at I2C address 0x57, but in fact it seems to be part of the EEPROM, and the UID is accessible via the user memory at I2C 0x53.So how does it actually work?? - if via I2C address 0x53 the System Configuration a

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 is what my uart debugging spits out:INIT - NFCNFC: Init start (POR -> RESET -> POWER-DOWN -> Ready Mode)ROP_REG_OPERATION = 0x00 (after PD write)ROP_REG_GENERAL = 0x01 (after write)ROP_REG_REGULATOR = 0x08 (after write)NFC IRQ triggered!IRQ: I_osc Oscillator readyROP_REG_OPERATION = 0x0A (after enable)ROP_REG_OPERATION = 0x0A (check mode)Chip is in READY mode (en = 1)STATUS register = 0x00NFC Reader OperationROP_REG_PROTOCOL = 0x85 (after write)ROP_REG_OPERATION = 0x3A (after write)NFC IRQ triggered!IRQ: I_txe End of transm

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 changed to HIGH in these short pulses.  The GPIO config: 

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 TagReadMemoryGenViewController.readMemoryContent) throws a ComStSt25sdkSTException with error code BAD_PARAMETER.The Setup:Chip: M24LR16E-R (IC Ref: 0x4E)Platform: iOS (Swift) using CoreNFCLibrary: ST25SDK for iOSThe Problem: Upon investigation, the root cause appears to be that the ST25SDK mTag.getMemSizeInBytes() returns a memory size of 0 bytes. Consequently, when readBytes() is called, the SDK performs an internal safety check: if (address + length > mMemSizeInBytes) { throw BAD_PARAMETER; } Since mMemSiz

I'm developing a new secret card project using STM32L476RG and X-NUCLEO-NFC07A1 board, I plan to let the secret card to store private key and do signature related tasks. I'm not sure where can I get blank card which contains the same MCU with STM32L476RG) and the same NFC7 with X-NUCLEO-NFC07A1? I found there are blank card in sale support NFC ISO 14443 protocol. Seem the NFC7 using ISO 15693 protocol. So the NFC blank card support support ISO 15693 protocol can run my image, as showed in image below?

Hello ST Community,We are developing an iOS application using the ST25SDK (Swift) to interact with a device equipped with the ST25DV02K-W1 (Dual Interface EEPROM).Our Goal: We need to configure the PWM parameters to control an Adjustable Output Current (AOC). Based on our system design (ported from a working Android implementation), we need to write 4 bytes to Block 62 (Address 0xF8 / 248bytes).The Data Structure: The 4 bytes represent:Bytes 0-1: Period (Little Endian)Bytes 2-3: Pulse Width (Little Endian), where Bit 7 of MSB is set to 1 to indicate "NFC Update".The Issue: The iOS app calculates the correct payload (e.g., [B1 3B 70 AF]) and executes writeSingleBlock without throwing any errors. The console logs confirm the command is sent. However, the value on the device does not

Hi, I'm performing for a customer a signal integrity simulation involving ST25R200 (SPI interface). Is there any IBIS model available for this component (or ST25R100)? Thanks, RegardsRoberto

Hello, everyone!My project consists of creating a sensor system that works with NFC. It will be a TAG with the st25dv04k chip, which will power a set of chips through Energy Harvesting. The reader system consists of the ST25R300, chosen for its transmission power. Currently, for the first steps, I am using the development cores: NFC04A1 and NFC12A1. And the RFAL middleware with STM32CubeIDE. 

Hi,Can the VPS_TX pin be powered with a voltage different from VPS? Specifically, can you connect VPS_TX to 5 V while VPS is at 3.3 V?I think it should work, but I would like your confirmation as I couldn't find this information in the datasheet.Thank you for your support.Marco

It is getting hang at this point, going to infinite loop MCU: STM32F407SPI1 InterfaceTried ST25R_SELFTEST as well same problem 

Hi, we use the ST25DV16KC and for development i use the ST25R3911B.   Problem is: ST25R3911B connected via micro usb to the pc.    so far looks good Pressing the TAG Editor Button   I just w

I am testing power consumption. The hardware is using nucleo-L476 and X-NUCLEO-NFC08A1, and the software is using the NFC06A1_PollingTagDetect routine from X-CUBE-NFC6. The test revealed that the average power consumption was 180 uA when entering the wakeup. I was using a 3.3V power supply. The minimum current is 40 uA.I'm not sure how to make the necessary modifications to achieve the description in AN5320.

I am using ST25R3916B with differential antenna without varicaps.The antenna is configured to receive maximum signal  from the smartphone on the RFI1.There is a TFT display between the antenna and the smartphone. The smartphone reads the tag with great difficulty even when pressed against the display.The ST25R3916B reads cards in card reader mode at a distance of about 2 cm from the display (when setting up the antenna to get the maximum signal from smartphone).Question: How can I increase the tag's reading range with my smartphone? ST25R3916B has sensitivity control registers, but there is no method for setting these parameters.Best regards.

I am entering the world of NFC with a somewhat complex project, but I took the initiative to start it. The goal was to create a sensor that would work only with Energy Harvesting from the reader.For this, I chose the ST25R300 chip to be the chip for my reader board and sensor power supply, mainly due to its high transmission power.I am having difficulty getting it to work properly. Basically, I ran several tests with some DEBUG codes on the reader board. In these tests, I found some inconsistencies. The first is the VDD_A voltages, which come from a reading of the chip itself, which is registering almost 6V, and the other inconsistency is the RSSI giving 0.I believe the error is in my antenna and matching circuit. I would like someone to help me improve this system by pointing out where I may have made a mistake in their design.I made the antenna using the ST website (eDesignSuite antenna design tool). I also made the maching circuit using ST's eDesignSui

Hello,I currently working with the STEVAL-25R3916B kit and using the ST25R3916 GUI to tune the antenna. My goal is to achieve a target amplitude of 2600 mV or higher, but the system remains around 2 V even when 5 V is selected for RF power on the reader expansion board.I’ve noticed that the amplitude displayed in the GUI is significantly lower than the target value after performing antenna tuning, and the parameter AAT_B reaches its maximum limit of 255.Here are the outputs and screen copies.-Startup TabST25R3916 Reader Board Detected.. 'ST25R3916-DISCO (MB) v1.4.3' FW=1.4.3                             Chip variant ST25R3916B   &nbs

Hello, is there any additional documentation that supports this system diagram? My project will have one antenna that will be an RFID tag whereas the other antenna will be reader. Can ST25r100 support this use case? I'd like to have the ability to write to a ca

I’m currently working on a project where I already managed to read ISO14443 tags (NTAG213) successfully.To improve the reading quality and range, I now want to switch to ISO15693 tags.However, I’ve spent more than 30 hours trying, and so far, I haven’t been able to read a single one.I know that using the RFAL (Radio Frequency Abstraction Layer) is the right approach for ISO15693, but no matter what I do, it just doesn’t work.I’ve tried several examples, libraries, and even asked AI tools for help — but I also know that AI isn’t great when it comes to low-level driver implementation.Does anyone here have experience with ISO15693 and RFAL on ESP32? Any working examples or tips would be really appreciated.

Hi STNow I am using ST25R3916B evaluation board, it works well with the project code you provided.My final target is using 3920B on automotive for demostrating NFC card detection as well as digital car access to customer.But we will finally change to other platform's MCU, not use ST's hsot MCU.Due to our MCU has limited Fash / RAM size, we are considering to build our own middleware code to drive NFC frond end. but it looks like it's hard to understand the protocol through I2C waveform, and no any protocol document is avaiable on your website.Is migating RFAL the only way I can do for realizing NFC function with 3916B / 3920B? ThanksLeo   

I am using a custom PCB based on ST25R3911B + STM32F072C8T6, and I am encountering an issue where FeliCa cards cannot be read.Initially, I used the X-CUBE-NFC5 software package downloaded from ST’s official website, along with the integrated RFAL library (the RFAL version should be V2.0.10). With this version, I was able to correctly implement most of the required functionality, including polling cards using ISO14443 / FeliCa / ISO15693 protocols. However, after running for several hours, the reader would occasionally enter a strange freeze/hang state. Because of this, I decided to upgrade the RFAL library.I then downloaded the STSW-ST25RLIB001 package from ST and ported the RFAL library from it (RFAL version should be V4.0.0). After the upgrade, the problem changed: as soon as a FeliCa card is detected, the system freezes immediately.To isolate the issue, I discarded all my own application logic and ran only demoCycle. In the demo, ISO14443 and ISO15693 cards w

Hello everyone,I am using the X-NUCLEO-NFC10A1 NFC reader with an NXP MCU.I am able to successfully detect a MIFARE Classic 4K card using this reader.However, when I try to authenticate a sector for read/write access, I encounter an issue.I am sending the authentication command using the sequence:[ AUTH_CMD + BLOCK_ADDRESS ]After sending this command, I get a timeout error.I tried increasing the timeout value, but the issue still persists.When I manually append the CRC to the authentication command and transmit it, the reader returns a framing error.Could someone please confirm:    Is this the correct way to perform MIFARE Classic 4K authentication using the ST25R200?    If yes, what could be the reason for the timeout or framing error?If anyone has reference code, application notes, or examples related to MIFARE Classic authentication with ST25R200, please share.Thank you in

Hi,I am using the st25r3916b chip with phase awaken, wake-up timer range of 800 msec and delta 3.Once it wakes up, I go to read the value in the register 0x3A (Phase measurement display register) in order to check which is the difference between of the stored value and the one which awakes the chip.What I can see is that the value change is less than 3. How can this be?Best regards, Sandra

HiFrom the ST25R3919B datasheet, I cannot find or understand the voltage level of EXT_LM. Does the EXT_LM voltage level depend on the VDD supply?”BR