ST STEVAL-ST25R3916B User manual

Introduction
The STEVAL-25R3916B 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.
Figure 1. STEVAL-25R3916B kit (top view)
Getting started with the STEVAL-ST25R3916B kit based on the ST25R3916B
high-performance NFC universal device and EMVCo reader
UM3033
User manual
UM3033 - Rev 1 - February 2023
For further information contact your local STMicroelectronics sales office. www.st.com

1Features
• 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
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Features
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2Hardware 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.
Figure 2. Hardware connection
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
Reference Connector Position Description
1 JP13 Closed 1-2 Card powered by USB
2 JP14 Closed 2-3 Card powered by micro-USB
3 JP15 Open STEVAL-25R3916B board powering (specific feature)
4 JP16 Open Card powered by an external source
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Hardware overview
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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
1
234
5
6
7
8
9
10
11
12
13
14
15
16
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Main board hardware
UM3033 - Rev 1 page 4/34

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
1
2
34
5
6
7
8
9
10
11
12
13
14
15
16
1
2.1.1 Jumper default configuration
The STEVAL-25R3916B jumpers are configured by default to power the kit through the micro-USB connector.
Figure 5. Jumper default configuration
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Main board hardware
UM3033 - Rev 1 page 5/34

Table 2. Jumper default configuration
Connector Position Description
JP2
Closed 1-2 ST-LINK UART debug featuresJP3
JP10
JP13 Card powered by USB
JP14 Closed 2-3 Card powered by micro-USB
JP16 Closed 1-2 Board powering specific feature
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.
Figure 6. Software development configuration
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.
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Expansion board hardware
UM3033 - Rev 1 page 6/34

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)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
1
Figure 8. STEVAL-25R3916B expansion board layout (bottom view)
2.2.1 Antenna and matching network components
This board contains the matching network and the automatic antenna tuning capacitors based on varicap.
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Expansion board hardware
UM3033 - Rev 1 page 7/34

3Getting 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.
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Getting started
UM3033 - Rev 1 page 8/34

4Schematic diagrams
Figure 9. STEVAL-ST25R3916B main board circuit schematic (1 of 10)
TSCR_I2C_SCL
TSCR_I2C_SDA
TSCR_IRQ
SDA
RS
CSX
TE
WR
LCD_BKLGHT_MOS_GATE
NRST
U_LCD
LCD.SchDoc
U_Pwr Supply
Pwr Supply.SchDoc
SPARE
GPIO_1_IRQ
I2C_SCL
I2C_SDA
SPI_MOSI
SPI_MISO
SPI_CLK
SPI_CSn
UART_RX
UART_TX
UART_RTSn
UART_CTSn
MCU_CLK
GPO_3/INT_3
GPO_2/INT_2
TDO/SWO
TMS/SWDIO
U_ST25DX Connectors
ST25DX Connectors.SchDoc
RESET#
TCK_SWCLK
UART_TX
UART_RX
STLK_MCO
STL_USB_D_P
STL_USB_D_N
USB_RENUMn
U_STLink-Jtag
STLink-Jtag.SchDoc
TMS/SWDIO
TCK_SWCLK
TDO/SWO
BLE_SPI_IRQ
BLE_SPI_CSN
BLE_SPI_MOSI
BLE_SPI_MISO
BLE_SPI_CLK
BLE_RESET
WF_UART_TX
WF_UART_RX
WF_UART_RTS
WF_UART_CTS
WF_RESET
STLK_UART_TX
STLK_UART_RX
TSCR_I2C_SCL
TSCR_I2C_SDA
TSCR_IRQ
STLK_MCO
ST25DX_SPARE
ST25DX_IRQ
ST25DX_I2C_SCL
ST25DX_I2C_SDA
ST25DX_SPI_MOSI
ST25DX_SPI_MISO
ST25DX_SPI_CLK
ST25DX_SPI_CSn
TSCR_SPI_MOSI
TSCR_SPI_CSn
TSCR_SPI_CLK
RESET#
POT_I2C_SDA
POT_I2C_SCL
POT_IN
MCU_USB_D_N
MCU_USB_ID
MCU_USB_D_P
I_MEAS_OUT
TSCR_TE
TSCR_WR
LCD_BKLGHT_MOS_GATE
GPO_4/BS1
GPO_6/D/C
GPO_5/BUSY
GPO_7/CS1
GPO_8/RESET
TSCR_SPI_MISO
ST25DX_UART_RX
ST25DX_UART_TX
ST25DX_UART_RTSn
ST25DX_UART_CTSn
ST25DX_MCU_CLK
GPO_2/INT_2
GPO_3/INT_3
U_STM32L476
SPI_IRQ
STM32L476.SchDoc
SPI_CSN
SPI_MOSI
SPI_MISO
SPI_CLK
BLE_RESET
UART_TX
UART_RX
UART_RTS
UART_CTS
WF_RESET
U_WIFI-BLE
WIFI-BLE.SchDoc
POT_I2C_SDA
POT_I2C_SCL
POT_IN
I_MEAS_OUT
U_EH
EH.SchDoc
JP6
HE14
JP7
HE14
JP8
HE14
JP9
HE14
GND
GROUND PINS
STL_USB_D_N
MCU_USB_D_N
MCU_USB_D_P
STL_USB_D_P
MCU_USB_ID
USB_RENUMn
U_USB
USB.SchDoc
GPO_4/BS1
GPO_6/D/C
GPO_5/BUSY
GPO_7/CS1
TSCR_SPI_CLK
TSCR_SPI_MISO
GPO_8/RESET
TSCR_I2C_SDA
TSCR_I2C_SCL
TSCR_SPI_MOSI
TSCR_SPI_CSn
FX1
HOLES FOR DAUGHTER BOARD
U_E-Paper_Connector
E-Paper_Connector.SchDoc
FX2
PLATED/2.7mm-6.0mm
FX3
PLATED/2.7mm-6.0mm
FX4
PLATED/2.7mm-6.0mm
GND
PLATED/2.7mm-6.0mm
Fiducial Fiducial Fiducial
MIR1
Fiducial
MIR2 MIR3 MIR4
UM3033 - Rev 1 page 9/34
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Schematic diagrams

Figure 10. STEVAL-ST25R3916B main board circuit schematic (2 of 10)
VUSB_ST_LINK
D1
BAT60JFILM
D3
BAT60JFILM
D2
5V
BAT60JFILM
C1
1uF/25V C2 C3
2.2uF/16V
1
10nF
2
34L2
2
744232090
1L1
2
742792042
1L3
5V
742792042
GND_USB
R1
0R
R3
0R
R4
NC
GND
VCC
LD1
GREEN
R2
510R
GND_USB
C48
10uF/25V
3V3
PEG1
SJ5306
PEG2
SJ5306
PEG3
SJ5306
PEG4
SJ5306
R118
0R NC
R119
0R NC
R120
0R NC
R121
0R NC
PEG5
SJ5306
6Vin
2GND
1EN
5
ADJ
4
Vout
PG 3
7
U1
GND(THPAD)
LD39050PUR
R45
15K
R44
47K
1 2
JP1
HE14
EXT. DC IN
VUSB_MCU
C54
10uF/25V
L9
C56
BLM18EG471SN1D
1uF/25V
JP15
HE14
EXT. +5V IN
GND_USB
GND_USB
R47
0R
C55
10uF/25V
GND
JP13
HE14
V_RF SELECT. V_RF
21L4
742792641
1 2 3
JP16
HE14
VCC_EHVCC V_EH
VCC_EH SELECT.
VUSB_ST_LINK
3
2
1
4
JP14
HE14
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UM3033
Schematic diagrams