ST25R3911B

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High performance HF reader / NFC initiator with 1.4 W supporting VHBR and AAT

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Product overview

Description

The ST25R3911B is a highly integrated NFC Initiator / HF Reader IC, including the analog front end (AFE) and a highly integrated data framing system for ISO 18092 (NFCIP-1) initiator, ISO 18092 (NFCIP-1) active target, ISO 14443A and B reader (including high bit rates), ISO 15693 reader and FeliCa™ reader. Implementation of other standard and custom protocols like MIFARE™ Classic is possible using the AFE and implementing framing in the external microcontroller (Stream and Transparent modes). The ST25R3911B is positioned perfectly for the infrastructure side of the NFC system, where users need optimal RF performance and flexibility combined with low power.
Thanks to automatic antenna tuning (AAT) technology, the device is optimized for applications with directly driven antennas. The ST25R3911B is alone in the domain of HF reader ICs as it contains two differential low impedance (1 Ohm) antenna drivers.
The ST25R3911B includes several features that make it very suited for low power applications. It contains a low power capacitive sensor that can be used to detect the presence of a card without switching on the reader field. The presence of a card can also be detected by performing a measurement of amplitude or phase of signal on antenna LC tank, and comparing it to the stored reference. It also contains a low power RC oscillator and wake-up timer that can be used to wake up the system after a defined time period, and to check for the presence of a tag using one or more low power detection techniques (capacitive, phase or amplitude).
The ST25R3911B is designed to operate from a wide (2.4 V to 5.5 V) power supply range; peripheral interface IO pins support power supply range from 1.65 V to 5.5 V.
  • All features

    • ISO 18092 (NFCIP-1) Active P2P
    • ISO14443A, ISO14443B, ISO15693 and FeliCa™
    • Supports VHBR (3.4 Mbit/s PICC to PCD framing, 6.8 Mbit/s AFE and PCD to PICC framing)
    • Capacitive sensing - Wake-up
    • Automatic antenna tuning system providing tuning of antenna LC tank
    • Automatic modulation index adjustment
    • AM and PM demodulator channels with automatic selection
    • DPO (Dynamic power output)
    • Up to 1.4 W in case of differential output
    • User selectable and automatic gain control
    • Transparent and stream modes to implement MIFARE™ classic compliant or other custom protocols
    • Possibility of driving two antennas in single ended mode
    • Oscillator input capable of operating with 13.56 MHz or 27.12 MHz crystal with fast start-up
    • 6 Mbit/s SPI with 96 bytes FIFO
    • Wide supply voltage range from 2.4 V to 5.5 V
    • Wide temperature range: -40 °C to 125 °C
    • QFN32, 5x5 mm package with wetable flank or wafer delivery

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All tools & software

    • Part number
      Status
      Description
      Type
      Supplier

      ST25R3911B-DISCO

      Active

      Discovery kit for the ST25R3911B high performance HF reader / NFC initiator

      ST25 NFC/RFID Eval Boards ST
      ST25R3911B-DISCO

      Description:

      Discovery kit for the ST25R3911B high performance HF reader / NFC initiator

      ST25R3911B-EMVCO

      Active

      EMVCo reference design for the ST25R3911B high performance HF reader

      ST25 NFC/RFID Eval Boards --
      ST25R3911B-EMVCO

      Description:

      EMVCo reference design for the ST25R3911B high performance HF reader
    • Part number
      Status
      Description
      Type
      Supplier

      STSW-ST25PC001

      Active

      Windows® PC software for ISO15693, ISO14443-A/B, NFC and industrial readers

      ST25 - NFC / RFID Software ST
      STSW-ST25PC001

      Description:

      Windows® PC software for ISO15693, ISO14443-A/B, NFC and industrial readers

      STSW-ST25R001

      Active

      PC software installer for ST25R3911B-DISCO

      ST25 - NFC / RFID Software ST
      STSW-ST25R001

      Description:

      PC software installer for ST25R3911B-DISCO

      STSW-ST25R002

      Active

      Sources of STM32L4 based firmware for ST25R3911B-DISCO

      ST25 - NFC / RFID Software ST
      STSW-ST25R002

      Description:

      Sources of STM32L4 based firmware for ST25R3911B-DISCO

      STSW-ST25R004

      Active

      Antenna Matching Tool for ST25R NFC/HF reader family

      ST25 - NFC / RFID Software ST
      STSW-ST25R004

      Description:

      Antenna Matching Tool for ST25R NFC/HF reader family

      STSW-ST25R009

      Active

      Linux demo of ST25R3911B for Raspberry Pi using X-NUCLEO-NFC05A1

      ST25 - NFC / RFID Software ST
      STSW-ST25R009

      Description:

      Linux demo of ST25R3911B for Raspberry Pi using X-NUCLEO-NFC05A1

      STSW-ST25RFAL001

      Active

      RFAL for ST25R3911B

      ST25 - NFC / RFID Software ST
      STSW-ST25RFAL001

      Description:

      RFAL for ST25R3911B