ST ST25R3911B User Manual
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ST ST25R3911B User Manual

Discovery kit for the high performance hf reader / nfc initiator
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Introduction
The ST25R3911B-DISCO is a ready-to-use development kit to evaluate the functions of the
high performance HF reader / NFC initiator ST25R3911B in Reader mode for contactless
applications.
The ST25R3911B-DISCO kit supports
• ISO 18092 (NFCIP-1) active P2P
• ISO 14443A and ISO14443B
• ISO 15693
• FeliCa™
• VHBR, with 6.8 Mbit/s PCD to PICC framing and 3.4 Mbit/s PICC to PCD framing
• Up to 1.4 W output power with differential antenna
• Possibility of driving two antennas in single ended mode, with automatic antenna tuning
(AAT) system
• Inductive and capacitive Wake-up
• User selectable and automatic gain control
• Transparent and Stream modes to implement MIFARE
custom protocols
The evaluation kit includes
• the STM32L476RET6, a 32-bit microcontroller with 512 KB of Flash memory
• a 105 mm x 52 mm, two turns antenna etched on the PCB, and its VHBR tuning circuit
• a Micro-USB connector for communication with the host PC and board powering
• six LEDs indicating the presence of the RF field and of the protocol used to communicate.
December 2017
Discovery kit for the ST25R3911B
high performance HF reader / NFC initiator
Figure 1. ST25R3911B-DISCO PCB (top view)
DocID029132 Rev 3
UM2042
User manual
®
Classic compliant or other
1/25
www.st.com
1

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Summary of Contents for ST ST25R3911B

  • Page 1 Discovery kit for the ST25R3911B high performance HF reader / NFC initiator Introduction The ST25R3911B-DISCO is a ready-to-use development kit to evaluate the functions of the high performance HF reader / NFC initiator ST25R3911B in Reader mode for contactless applications.

  • Page 2: Table Of Contents

    ST25R3911B ........
  • Page 3 UM2042 List of tables List of tables Table 1. NFC Forum matching alternatives ......... . . 21 Table 2.
  • Page 4 ST25R3911B-DISCO PCB (top view)........

  • Page 5: Quick Start

    UM2042 Quick start Quick start The ST25R3911B-DISCO is connected to a PC via USB to show the features of the ST25R3911B chip. To do so, use the software STSW-ST25R001 to control all the functions of the discovery kit. Getting started Connect the discovery kit to a PC using a micro USB cable.

  • Page 6: Hardware

    STM32 MCU located on the PCB. The STM32 MCU (based on Arm core) then operates the ST25R3911B via SPI. The ST25R3911B is connected directly to the 5 V supply of the USB bus. An LDO converts this voltage down to 3.3 V, to supply the microcontroller.

  • Page 7: Usb Connectivity And Power Supply

    The five resistors (R218 to R222) can be used to disconnect the MCU from SPI interface header P204. This SPI cross-connect mode can be used to operate the ST25R3911B with a different MCU PCB by cross connecting the ST25R3911B SPI to the second MCU PCB.

  • Page 8: Antenna And Matching Network Components

    This schematic contains the matching network and the automatic antenna tuning capacitors, as well as the alternative NFC Forum matching components. In the default configuration, the ST25R3911B-DISCO is populated with a VHBR matching, with communication speeds up to 3.4 Mbps.

  • Page 9: Figure 3. Schematics Overview

    Figure 3. Schematics overview U_Power Management U_Microcontroller U_ST25R3911B U_Antenna Power Management.SchDoc Microcontroller.SchDoc ST25R3911B.SchDoc Antenna.SchDoc PM/USB_con PM/USB_con SPI/Power_Con SPI/Power_Con Antenna_Con Antenna_Con ST25R3911B-DISCO Title Size: Number: Revision: Date: 31.05.2017 Time: 10:09:36 Sheet File: Project Overview.SchDoc MDG NFC & Reader Competence Center...

  • Page 10: Figure 4. Usb Interface

    ECMF02-4CMX8 LED101 J101 μUSB closed 0R G101 Logo_ESD L102 L103 FB_0603_0R FB_0603_0R G102 RoHS Logo_RoHS G103 ST25 Logo_ST25 G104 ST Microelectronics Logo_STM 3V3 LDO PM/USB_con V_RF V_RF U102 LD39050PU33R V_RF 3_3V PM/USB_con USBD_N USBD_N C105 C104 C106 USBD_P USBD_P C_10n_0402_X7R C_1μ_0603_X5R...

  • Page 11: Figure 5. Stm32L476 Schematics

    Pin 12+13 Pin 12+13 AVDD AVDD P204 d.n.p. C_100n_0402_X7R R223 C209 C210 C211 C212 C213 C214 C215 5 5 5 C216 C216 ST25R3911B-DISCO Title C_1μ_0402_X5R C_4μ7_0402_X5R C_4μ7_0402_X5R C_100n_0402_X7R C_100n_0402_X7R C_100n_0402_X7R C_100n_0402_X7R C_100n_0402_X7R Size: Number: Revision: Date: 31.05.2017 Time: 10:09:36 Sheet File: Microcontroller.SchDoc...

  • Page 12: Figure 6. St25R3911B Schematics

    Figure 6. ST25R3911B schematics ST25R3911 NFC Initiator / HF Reader Controller Interface J301 J302 V_RF SPI/Power_Con V_RF C301 L301 d.n.p. V_RF_3911 V_RF FB_0603 3_3V C_1μ_0402_X5R SPI/Power_Con R301 JP301 INTR_11 INTR C302 MISO_11 R302 MISO R303 C303 C304 d.n.p. MOSI_11 MOSI d.n.p.

  • Page 13: Figure 7. Antenna And Matching Network Schematics

    C421 C422 Antenna_Con TRIM1_0 TRIM1_1 C_56p_0402 TRIM2_3 TRIM1_3 C_56p_0402 TRIM1_1 TRIM1_2 TRIM1_2 TRIM1_3 TRIM1_3 TRIM2_0 TRIM2_0 TRIM2_1 TRIM2_1 TRIM2_2 TRIM2_2 TRIM2_3 TRIM2_3 ST25R3911B-DISCO Title Size: Number: Revision: Date: 31.05.2017 Time: 10:09:36 Sheet File: Antenna.SchDoc MDG NFC & Reader Competence Center...

  • Page 14: Pcb Layout

    2.3.2 PCB layers The PCB layout is designed considering that the ST25R3911B is a high power RF transmitter, hence the decoupling capacitors are located as close as possible to the positive and negative power supply pins, for example VSP_RF and VSN_RF.
  • Page 15 Mid layer 2 Mid layer 2 (Figure 11) is used for the power distribution. It contains the power planes for the 5 V supply of the ST25R3911B and the 3.3 V supply of the microcontroller. Bottom layer The bottom layer (Figure 12) is mainly a GND plane, but some traces are routed through it.

  • Page 16: Figure 9. Pcb Layout, Top Layer

    Figure 9. PCB layout, top layer...

  • Page 17: Figure 10. Pcb Layout, Mid Layer 1

    Figure 10. PCB layout, mid layer 1...

  • Page 18: Figure 11. Pcb Layout, Mid Layer 2

    Figure 11. PCB layout, mid layer 2...
  • Page 19 Figure 12. PCB layout, bottom layer...

  • Page 20: Antenna Matching

    Antenna matching UM2042 Antenna matching The default matching network assembled enables VHBR operation up to 3.4 Mbps. Components for an optional NFC Forum matching are placed on the board. Exchanging the components as indicated in Table 1 will increase the Q factor of the antenna system. VHBR communication at 3.4 Mbps and 1.7 Mbps bit rate will not be supported anymore, but the read range for lower data rate applications will increase, up to 20%.

  • Page 21: Figure 14. Nfc Forum Matching With An Aat Setting Of 11

    UM2042 Antenna matching Table 1. NFC Forum matching alternatives Default assembly Value NFC Forum replacement Value C403 80 pF C403_NFCF 120 pF C410 180 pF C410_NFCF 120 pF R401 R401_NFCF 1R96 R402 R402_NFCF 1R96 With the new assembled values, the matching impedance looks as in Figure 14, with a value close to 11 + j6 Ω.

  • Page 22: Federal Communications Commission (Fcc) And Industry Canada (Ic) Compliance Statements

    Federal Communications Commission (FCC) and Industry Canada (IC) compliance statements Federal Communications Commission (FCC) and Industry Canada (IC) compliance statements FCC Compliance Statement 4.1.1 Part 15.19 This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

  • Page 23: Declaration De Conformité

    UM2042Federal Communications Commission (FCC) and Industry Canada (IC) compliance state- 4.2.2 Declaration de Conformité Le présent appareil est conforme aux CNR d’Industrie Canada applicables aux appareils radio exempts de licence. L’exploitation est autorisée aux deux conditions suivantes: (1) l’appareil ne doit pas produire de brouillage, et (2) l’utilisateur de l’appareil doit accepter tout brouillage radioélectrique subi, même si le brouillage est susceptible d’en compromettre le fonctionnement.

  • Page 24: Revision History

    Section 4.1.4: FCC ID Section 4.2.3: IC 25-Jul-2017 Updated Figure 8: PCB overview, Figure 9: PCB layout, top layer Figure 12: PCB layout, bottom layer. Updated Figure 1: ST25R3911B-DISCO PCB (top view). 15-Dec-2017 Updated Section 2: Hardware. 24/25 DocID029132 Rev 3...
  • Page 25 ST products and/or to this document at any time without notice. Purchasers should obtain the latest relevant information on ST products before placing orders. ST products are sold pursuant to ST’s terms and conditions of sale in place at the time of order acknowledgement.

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