ST25 NFC/RFID tags and readers

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 errors emitted, stopping now"Could someone please help me to fix those issues and make everything works properly?I've also download the ST25SDK but, when I've took a look the Readme file I saw that the SDK can be used for Android app and PC app (not iOS app)

Hello,I am using the ST25R3916B reader on a custom board to read NFC-A cards. I first experimented on the X-Nucleo-nfc08a1 expansion board connected to esp32-s3 devkit. I modified the RFAL library a bit to fit my needs and kept most registers at their default values. With this setup I was able to communicate with an NFC-A card perfectly.On my custom board, which is powered by 3V, I am able to communicate with the reader: read IC ID, read/write registers, receive interrupts. But I still haven't been able to communicate with the card. I receive no ATQA for my REQA. In fact no rxs or rxe interrupts are being raised (txe interrupt is being raised after sending direct command Send REQA). Code used on X-nucleo-nfc08a1 and custom board are exactly the same, except they have different SDA and IRQ pins.I am still checking out the hardware design to check for any issues, especially with the antenna matching circuit. In the mean time I wanted to check a few other things:1. I receive an oscil

To realize carkey function, what conditions do card readers need and what aspects of hardware will be measured?

Hello everyone,I just received the STEVAL-25R200A evaluation kit and I have a few doubts.1. Can I connect this board directly to another MCU?2. If yes, are the SPI pins available on the PCB?3. I found that the board uses an STM32G0B1KEU. Should I develop and test the firmware for this MCU using STM32CubeIDE first, and then later port it to my custom board?Thank you! 

Hi,The ST25DV supports I2C speeds upto 1MHz, for which the datasheet has mentioned the rise and fall time using the RC time constant of <150ns according to I2C standards.We are using it at 100kHz only but there is no mention of rise and fall time for 100kHz ( acc to I2C standard it should be <1000ns), and the following point is mentioned in datasheet as attached.Does this mean that ST25DV supports only <150ns rise and fall time even if it used only at 100kHz? 

I am using ST25DV04KC tag and using the V_EH pin to power the VCC of the tag only( It will generate around 3.3V which is enough to power up the tag in I2C mode I believe) . I am looking for guidance on the maximum pullup voltage on the I2C and GPO line from an external rail of around 3.6V, if it is okay? what can be the max voltage on the I2C and GPO pins? is it independent of VCC or dependent on VCC?

 Hi,I need to write the same kind of NDEF data to ~20 different NFC stickers placed on a panel. The idea is to have ~20 small antennas, select one at a time, and write to the sticker sitting above that antenna.Questions:Can I do this with X-NUCLEO-NFC12A1 + STM32 by multiplexing the RF path (switches/decoder → select 1-of-20 antennas)?Any recommended switch/multiplexer parts or reference designs for 13.56 MHz?What are the practical limits on antenna count and cable/trace length when switching like this?Do I need individual tuning (matching caps) per antenna position?Is there a better Nucleo shield for this use-case (e.g., higher RF drive) or is NFC12A1 enough?Goal: operator chooses pad 1…20, we write an NDEF, verify, then move to the next pad.Kindly advise—example schematics/app notes or code pointers would be great.Rgds,Rp#stm32 #nfc #x-nucleo-nfc12a1 #antenna #multiplexing #ndef

Hello,I hope this is not a duplicate but I didn't find a similar issue.I'm developing for my company an Android app using the STSW-ST25SDK001 - Software Development Kit for ST25 Tags and Dynamic Tags (https://www.st.com/en/embedded-software/stsw-st25sdk001.html).To use your SDK i have to include two artifacts:st25sdk-1.13.0.jarst25_android_reader_interface-1.0.12-release.aar, specific for AndroidI see that the AAR includes an "application" tag in its AndroidManifest.xml, even if it's only a library and does not provide an Application class:<application android:allowBackup="true" android:label="@string/app_name" android:supportsRtl="true" ></application>This cause Gradle to complain and fail build with the following error: Manifest merger failed : Attribute application@allowBackup value=(false) from AndroidManifest.xml:7:9-36is also present at [st25_android_reader_interface-1.0.12-release.aar] AndroidManifest.xml:10:9-35 value=(true).Suggestion: add 'tools:replace="andr

Hello ST Community,I am using a STEVAL-25R200A to do tests with the ST25TV02KC.I am trying to rfalST25xVPollerPresentPassword, with a pwdNumber of 0x00 to enter Configuration Session (As described in the nfc tag datasheet), But keep getting error 5, even though I am passing the default 32-bit password.I am using this function:ReturnCode ST25TAGS_TVC_OpenSecuritySession(const uint8_t * uid, ST25TAG_TVC_SecuritySession_t sessionType, const uint8_t * pPassword) { uint8_t pwdNumber; uint8_t pwdLengthInBytes = 4; ReturnCode errCode; uint8_t rxBuf[ 1 + 2 + 2 ]; /* Flags + Random Number Data + CRC */; uint16_t rcvLen; uint8_t updatedPassword[8]; switch (sessionType) { case CONFIGURATION_SECURITY_SESSION: pwdNumber = 0; break; case USER_AREA1_SECURITY_SESSION: pwdNumber = 1; break; case USER_AREA2_SECURITY_SESSION: pwdNumber = 2; break; case SINGLE_USER_AREA_SECURITY_SESSION: pwdLengthInBytes = 8; pwdNumber = 1; break; case UNTRACEABLE_SECURITY_SESSION: pwdNu

Hello ST Community, I am currently working on an in-house NFC anti-counterfeiting authentication platform for my clothing brand. The system is being built using the ST25TV02KC tag, and we are now in the stage where access to AN5580 – “TruST25 digital signature for ST25TV512C and ST25TV02KC devices” is required to complete our provisioning and backend integration. I have already submitted a request via ols.st.com, but after checking the forums I noticed that many users were informed that access to AN5580 must be coordinated through a local ST sales representative. However, the official contact listed for Mexico appears to be outdated (phone number no longer active, and the physical office shows as permanently closed on Google Maps). Because of this, I am unsure how to proceed or who to contact for this restricted document. Thank you very much for your support.

Hello  Can someone help with locating software documentation for the implementation of Anti Cloning Verification using the TruST Digital Signature with STTV25-02KC chips. I've found plenty of sales & marketing materials describing it on the ST website. However there seems to be nothing that is Specifically Code Related existing that can assist our developers in actually employing it.  ( I am told that documentation for this is absent within both Apple and Android SDKs.) Additionally, we may be retaining an experienced advisory, so please say "Hello" if you're a match.  Regards ,Andrew Rae   @shuvrak 

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 look ok. Im attaching schematics, board project, soldering under the microscope and scope traces. The communication works in loopback (when i physically short MISO and MOSI).  SCKMOSICS for(;;) { HAL_GPIO_WritePin(SPI1_CS_GPIO_Port, SPI1_CS_Pin, GPIO_PIN_SET); HAL_GPIO_WritePin(SPI1_CS_GPIO_Port, SPI1_CS_Pin, GPIO_PIN_RESET); HAL_SPI_TransmitReceive(&hspi1, txData, rxData, 2, 1000); if (rxData[1] == 255) { HAL_GPIO_TogglePin(LED_STATUS1_GPIO_Port, LED_STATUS1_Pin); HAL_GPIO_TogglePin(LED_STATUS2_GPIO_Port, LED_STATUS2_Pin); } else { HAL_GPIO_TogglePin(LED_WARNING_GPIO_Port, LED_WARNING_Pin); HAL_GPIO_TogglePin(LED_ERROR_GPIO_Port, LED_ERROR_Pin); } HAL_GPIO_WritePin(SPI1_CS_GPIO_Port, SPI1_CS_Pin, GPI

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 suitable evaluation kit for ST25R3920B?Thanks,Leo

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 capacitor up to 2.7pF (C_COUP, between the 2 electrodes, I think... not sure).  But, on the other hand, the reference design (Discovery Kit ST25R3911B-DISCO) has no C_COUP shown in the schematic -- maybe because there is enough capacitance already between the electrodes? --  and it has an RC of 1k and 12pF on both CSI and CSO, without explanation.  It is not clear why we want to minimize parasitic capacitance to ground, but then we deliberately add 12pF of capacitance to GND.  Some clarity on the design goals for CSI and SCO would really be appreciated.  thanks! 

 Hello, the NFC reader I use is ST25R100. My card is Mifare Desfire EV2. Does it support it?My configs are like this, but it doesn't read the uid. It reads the NFCA type correctly. 

Hi,   I am currently working on a use case involving the ST25DV16K NFC and Phytec Pollux board for Wi-Fi credentials sharing and connectivity. I came across the following Arduino library for ST25DV:https://github.com/stm32duino/ST25DV   I would like to clarify the following points: Can this library be used for I²C communication between the ST25DV16K NFC and the Phytec Pollux board? The stm32duino/ST25DV library lists supported architectures — would it be compatible with the Pollux board, which is based on an ARM 64-bit architecture? If not compatible, could you please share if there are any supported libraries or APIs for ARM64 platforms? Looking forward to your guidance.   Best regards,Pritha Suresh

Hello,We want to implement the new ST25100 or ST25R200 in our project. There we need to have 8 RFID antennae to read and write to 8 NFC Tags as fast as possible. The NFC Tags will be placed on a drawer, so all 8 Tags are in the range of the antennae at the same time.We already did a prototype 1 years ago with ST25R95 (CR95HF). There we had one stm microcontroller and 8 ST25R95 connected by the same SPI. The used RFAL firmare has only one instance of ST25R95 and we had to startup and initialize every chip one by one to read out the tags. This setup needs time to start every chip and reading the tag. At problems with initializing, resetting this chip was very bad, but the new chips have a reset line.The 8 RFID antennae and ST25R95 have a distance of 80mm next to each other, so we have a large distance from the first to last chip and antennae. The antenna is not an integrated PCB antenna. Every antenna is connected by a 200mm cable to the PCB.My question now is what will be the bette

The subject line says it all - any help will be appreciated 

Hi,is there a polling-only Linux C code example for the X-NUCLEO-NFC09A1? The demo app is IRQ based and we plan to use many readers so it would be convenient to save the IRQ pin and use only the CS pin per device.Regards.

Hello ST Team,I’m enabling the mailbox on an ST25DV tag and performing RF mailbox Write/Read using ISO15693 custom commands. I’d like to confirm the correct enable sequence and how to verify that the mailbox is truly enabled.What I observeI can send Write Message (0xAA) over RF and see HOST_PUT_MSG afterward.But reading MB_CTRL_Dyn shows 0x00, which suggests the mailbox isn’t enabled.My understandingFrom the docs, proper enable requires:Presenting the system password (if protection is active),Setting MB_MODE in the static FTM configuration,Setting MB_EN in MB_CTRL_Dyn (dynamic register).Only then should MB_CTRL_Dyn report enabled (e.g., MB_EN=1) and lengths appear in MB_LEN_Dyn.QuestionsWhat is the exact recommended RF sequence (request frames) to:Present password,Set MB_MODE (static FTM),Set MB_EN (dynamic control)?Should Write Message (0xAA) be accepted when MB_EN=0?After a correct enable, what values should I expect when reading MB_CTRL_Dyn and MB_LEN_Dyn?Is there an official exampl

I'm trying to read the ST25DV64K memory but the ST25 NFC Tap app just keeps trying to read it, it keeps blinking as if it's trying to read it and then fails and the screen goes back to normal. I'm using a Samsung S24 Uktra with Android 16.

I'm developing an ios app and a need to present a password to write a protected block. I use the custom command 0XB3 that i allready used in the equivalent android app. Unfortunately without success. So I tried with the custom command menu of the NFC tap st app, The custom command, with android work and with ios NO. see the attached pictures. I hope someone can Help me..

    Hello ST Community, Our company is preparing to begin a project segment for our mobile application that would involve switching to the ST25TV NFC chip specifically for its anti-cloning protection features. I am not a developer myself, but I would like to gather clarity and guidance as we scope this integration and determine whether the ST25TV chip is the best course forward, given the potential scope of implementation work. We are aiming to: Implement TruST Digital Signature functionality. Enable read/write of URLs on ST25TV NFC tags. Work with the available SDK, noting that it does not currently provide iOS 17 + Swift code. Understand best practices for deployment on iOS mobile devices. Our key inquiries are: Is there existing support for mobile ISO devices that we may have overlooked? What methods are developers using to integrate ST25TV NFC on iOS? What is the scale of work required (effort, complexity, timelines)? Does ST offer any alternative soluti

I am working on an electronic chessboard that connects to Lichess. The board should be able to detect any chess position at any time, so I cannot rely on move tracking. For this reason, I chose NFC to identify each piece using tags.I am currently developing a cost-optimized and low latency hardware architecture for this project.With the help of @Travis Palmer , I completed my first prototype PCB, which includes 4 antennas and analog multiplexers as described in application note AN6121. Using this approach, I would need 64 antennas, 64 multiplexers and multiple NFC readers for low latency, which is quite costly and complex.Travis suggested an alternative keypad-style antenna matrix layout with 8 row antennas and 8 column antennas (total 16 antennas), as shown below:I understand that with anti-collision it is possible to detect multiple tags on the same row or column. However, I do not understand why the antennas should overlap. Wouldn’t it be better if the antennas do not inte

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 impedance matching values, and the original impedance matching diagram. Communication is currently possible at very close range. To increase communication distance and stability, what modifications should be made?   *This post has been translated from Chinese to comply with the ST Community guidelines.