ST ST25R3911B User Manual

December 2017 DocID029132 Rev 3 1/25
1
UM2042
User manual
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.
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
®
Classic compliant or other
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.
Figure 1. ST25R3911B-DISCO PCB (top view)
www.st.com

ST ST25R3911B Specifications

General

Operating Frequency	13.56 MHz
Operating Voltage	2.4 V to 5.5 V
Interface	SPI, I2C
Operating Temperature	-40 °C to +85 °C
NFC Standards Supported	ISO 14443A, ISO 14443B, ISO 15693, ISO 18092
Supported Protocols	NFC
Modulation Schemes	ASK
Output Power	Up to 1.4 W
Category	NFC Transceiver

Summary

Introduction

Quick Start

Getting Started

Connect the discovery kit to a PC using a micro USB cable and install the STSW-ST25R001 software.

System Requirements

Lists the Windows PC, USB port, and power supply requirements for the discovery kit.

Hardware

Block Diagram

Shows the functional block diagram of the ST25R3911B-DISCO board and its main components.

Schematics

Details the electrical schematics for USB, MCU, ST25R3911B, and antenna matching circuits.

PCB Layout

Describes the physical organization and layers of the printed circuit board, including antenna placement.

Antenna Matching

VHBR Matching

Explains the VHBR matching configuration with a target Q-Factor of 8 for high-speed operation.

NFC Forum Matching

Details the NFC Forum matching configuration for increased read range, requiring component changes.

FCC and IC Compliance Statements

FCC Compliance Statement

Covers FCC rules Part 15.19, 15.21, 15.105, and the specific FCC ID for the device.

Industry Canada Notices

Provides Industry Canada compliance statements and the associated IC ID.

Revision History