Steval-st25r3916b High Performance Nfc Universal Device And Emvco Reader Owner's Manual

ST25R3916B High Performance NFC Universal Device and Emvco Reader
Owner’s Manual

Introduction

The STEVAL25R3916B is a ready-to-use kit based on the ST25R3916B high-performance NFC universal device for contactless applications. The kit allows evaluating this device features and functionality in the reader/writer, peer to peer, and card emulation modes. The kit consists of:

• a microprocessor main board (STEVAL-M25R16B), which includes hardware and software tools that enable using the entire STM32 ecosystem. This board is powered through USB connectors
• a reader expansion board (STEVAL-D25R16B), which embeds the ST25R3916B device and an antenna etched on the PCB with its tuning circuit

The communication link between the two boards is the SPI bus. The processor card provides the power. Specific data lines complete the pin connector assignment shared between the cards.
Thanks to several demonstrations that can be performed, this kit helps the users develop and test their applications. The kit is FCC certified, with FCC ID: YCPR3916BD1. It is also IC certified, with IC: 8976A-R3916BD1; PMN: STEVAL-25R3916B; HVIN: STEVAL-25R3916B.

Features

• NFC card reader IC: ST25R3916B
• 13.56 MHz inductive antenna etched on PCB and associated tuning circuit
• ISO18092 (NFCIP-1) active and passive initiator and target modes
• NFC Forum NFC-A, NFC-B, NFC-F, and NFC-V reader
• ISO14443A, ISO 14443B, and ISO15693 reader
• FeliCa™ reader
• Support for all five NFC Forum Tag types in reader mode
• Power output 42 dBμA/m @10 m (maximum power according to ETSI EN 300 V2.1.1)
• NFC Forum Type 3 tag (NFC-F) host card emulation
• NFC Forum Type 4A tag (NFC-A) host card emulation
• Transparent and stream modes to implement MIFARE™ classic compliant or other custom protocols
• Integrated inductive sensing system for low-power detection of a tag presence using phase or amplitude measurement
• High output power
• User selectable and automatic gain control
• Serial peripheral interface (SPI) up to 10 Mb/s
• I²C with up to 400 Kbit/s in fast mode, 1 Mb/s in fast mode plus
• Automatic antenna tuning (AAT) via a variable capacitor

Hardware overview

The main board PCB is usually connected to the PC via USB.
The STM32 MCU firmware controls the ST25R3916B via the extension connectors.
The 5 V supply of the USB bus powers both boards. An LDO converts this voltage down to 3.3 V to supply the microcontroller and the ST25R3916B.
For the reader expansion board, you can select a 3.3 or 5 V RF powering. A green LED close to the motherboard micro-USB plug indicates when the board is powered.2.1 Main board hardware
The STEVAL-25R3916B main board embeds a 32-bit microcontroller of the STM32L476 series, which is based on the Arm Cortex-M4 high-performance CPU with FPU. This board is powered through the USB bus. It includes:

• an ST-LINK in-circuit debugger and programmer for STM32 microcontrollers
• push buttons (reset and user)
• a mini-USB debug connector
• a user-dedicated micro-USB connector
• support for ST NFC tag

Table 1. Powering options

Figure 3. STEVAL-25R3916B main board layout (top view)

1. Software bus (ST-LINK)
2. ST-LINK activity LED
3. Reset button
4. User button
5. User LED
6. Extension connectors
7. On-going tag detection indicator
8. Extension connector – GPIO setting
9.  Joystick
10. Wi-Fi reset button
11. Wi-Fi software update
12. Power 3.3 V LED
13. Wi-Fi status LED
14. Powering options
15. User USB
16. ST-LINK USB

Figure 4. STEVAL-25R3916B main board layout (bottom view)

1. STM32L476 MCU
2.  Test points for external connections
3. Room for Wi-Fi module
4.  Regulator
5.  STM32 ST-LINK
6.  Room for Bluetooth® Low Energy module

2.1.1 Jumper default configuration
The STEVAL-25R3916B jumpers are configured by default to power the kit through the micro-USB connector.
Table 2. Jumper default configuration

2.1.2 Software development configuration
This section describes the software development configuration for the main board. It also describes the USB connection when using the embedded ST-LINK.
The J1 micro-USB connector powers the STEVAL-25R3916B.
The J2 mini-USB allows exchanging data between the board and the computer.

2.2 Expansion board hardware
The STEVAL-25R3916B reader expansion board embeds:

• ST25R3916B
•  an antenna, with its own tuning circuit, etched on the PCB
• a switch to select 3.3 V or 5 V RF powering

The ST25R3916B is directly connected to the filtered 5 V USB supply.
There are additional supply filtering components close to the NFC/HF reader IC. All the decoupling capacitors have been placed as close as possible to the ST25R3916B.
To connect another reader PCB via SPI, remove the serial resistors and use CN100. By default, the SPI is the firmware and hardware access bus.
Use the I²C bus, instead, by changing J200, J201, J202, J203, J204, and J205.
J206 allows bypassing the internal VDD_RF/VDD_AM regulators to supply an output current higher than 350 mA.

Figure 7. STEVAL-25R3916B expansion board layout (top view)

1. RF front-end area
2. ST25R3916B
3. RF powering selection switch (3.3 or 5 V)

2.2.1 Antenna and matching network components
This board contains the matching network and the automatic antenna tuning capacitors based on varicap.

Getting started

3.1 System requirements

• A micro-USB cable
• A USB port capable of delivering at least 400 mA at 5 V (2 W)
• A safety extra-low voltage (SELV) limited power source to supply the unit through the USB port
• A mini-USB cable to use the embedded ST-LINK and the STM32 ecosystem development

3.2 How to use the kit in standalone mode
Step 1. Connect the STEVAL-25R3916B main board to the reader expansion board.
Important: It must be used on a clean and non-flammable surface.
Step 2. The kit is delivered with the default jumper configuration. Power it through the micro-USB via a cable connected to the power source.
Step 3. Supply the unit through a safety extra-low voltage (SELV) limited power source via the USB port.
The source must not exceed 60 VDC/8 A/100 V.
When powered up, the microcontroller starts the firmware, which is already downloaded in the flash memory. This allows demonstrating the ST25R3916B features:
– reader and writer
– card emulation
– peer to peer
– automatic antenna tuning
– USB mode (refer to the next section for further details)

3.3 How to use the kit in USB mode
Step 1. Connect the STEVAL-25R3916B kit to a PC via a micro-USB cable.
Important: It must be used on a clean and non-flammable surface.
The PC USB port must be capable of delivering at least 250 mA at 5 V.
Step 2. To control the board, download the STSW-ST25R010 software and install it.

Schematic diagrams

Bill of materials

Table 3. STEVAL-VOICE-UI bill of materials

Table 4. Main board bill of materials

Table 5. Reader expansion board bill of materials

Kit versions

Table 6. STEVAL-ST25R3916B versions

1. These codes identify the first version of the boards contained in the kit. They are printed on the boards PCB.

Regulatory compliance information

Notice for US Federal Communication Commission (FCC)
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. Changes or modifications not expressly approved by the manufacturer could void the user’s authority to operate the equipment.

Note:
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.

Standard applied: FCC 47 CFR Part 15.225: April 2020

Notice for Innovation, Science and Economic Development Canada (ISED)
This device complies with Innovation, Science and Economic Development RSS standards. 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. Changes or modifications not expressly approved by the manufacturer could void the user’s authority to operate the equipment.

Notice for the European Union
The STEVAL-25R3916B is in conformity with the essential requirements of the Directive 2014/53/EU (RED) and of the Directive 2015/863/EU (RoHS). Applied harmonized standards are listed in the EU Declaration of Conformity.
Notice for the United Kingdom
The STEVAL-25R3916B is in compliance with the UK Radio Equipment Regulations 2017 (UK SI 2017 No. 1206 and amendments) and with the Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment Regulations 2012 (UK SI 2012 No. 3032 and amendments). Applied standards are listed in the UK Declaration of Conformity.

Revision history

Table 7. Document revision history

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References

• STMicroelectronics: Our technology starts with you
• STMicroelectronics Trademark List - STMicroelectronics
• BAT60 - 10 V General pupose Signal Schottky Diode - STMicroelectronics
• LD39050 - 500 mA low quiescent current and low noise voltage regulator - STMicroelectronics
• ST-LINK/V2 - ST-LINK/V2 in-circuit debugger/programmer for STM8 and STM32 - STMicroelectronics
• ST25R3916B - NFC reader for payment, consumer and industrial - STMicroelectronics
• STEVAL-25R3916B - Discovery kit for the ST25R3916B high performance NFC universal device and EMVCo reader - STMicroelectronics
• STM32F103CB - Mainstream Performance line, Arm Cortex-M3 MCU with 128 Kbytes of Flash memory, 72 MHz CPU, motor control, USB and CAN - STMicroelectronics
• STM32L476VG - Ultra-low-power with FPU Arm Cortex-M4 MCU 80 MHz with 1 Mbyte of Flash memory, LCD, USB OTG, DFSDM - STMicroelectronics
• STR2P3LLH6 - P-Channel 30 V, 0.048 Ohm typ., 2 A STripFET H6 Power MOSFET in a SOT-23 package - STMicroelectronics
• STSW-ST25R010 - PC software installer for ST25R3916-DISCO and STEVAL-25R3916B boards - STMicroelectronics