ST STM32WL Series User manual

Introduction
The B-WL5M-SUBG1 STM32WL connectivity expansion board provides an affordable and flexible way for users to try out new
concepts and build prototypes with the STM32WL series STM32WL5MOC microcontroller module.
The B-WL5M-SUBG1 product requires a separate probe for programming and debugging. The STLINK-V3SET debugger can
be connected through a MIPI10/STDC14 cable.
The B-WL5M-SUBG1 STM32WL connectivity expansion board is provided with a USB Type-C® connector on an add-on
STMod+ adapter board.
The B-WL5M-SUBG1 product is provided with the STM32WL comprehensive software HAL library and various packaged
software examples available with the STM32CubeWL MCU Package.
Figure 1. B-WL5M-SUBG1 product
Picture is not contractual.
STM32WL5MOC connectivity expansion board
UM3127
User manual
UM3127 - Rev 1 - January 2024
For further information contact your local STMicroelectronics sales office. www.st.com

1 Features
• STM32WL connectivity expansion board embedding an STM32WL5MOC module including:
– Ultra‑low‑power STM32WL55JC microcontroller multiprotocol LPWAN dual‑core based on
Arm® Cortex®‑M4/M0+, featuring 256 Kbytes of flash memory and 64 Kbytes of SRAM in a
UFBGA73 package
– RF transceiver (150 MHz to 960 MHz frequency range) supporting LoRa®, (G)FSK, (G)MSK, and
BPSK modulations
• 4‑Mbit CMOS serial flash memory and 256‑Kbit serial I2C bus EEPROM
• MEMS sensors from STMicroelectronics:
– Integrated high-accuracy temperature sensor
– High-accuracy, ultra-low-power, 3-axis digital output magnetometer
– 3D accelerometer and 3D gyroscope
– Ultracompact piezoresistive absolute pressure sensor
• Three user LEDs
• User and reset push-buttons
• Board connectors:
–MIPI® debug
– STMod+
– Stubby antenna
– USB Type-C® for power only on add‑on STMod+ adapter board
• Flexible power supply options: external sources, or USB VBUS from the add‑on board
• Comprehensive free software libraries and examples available with the STM32CubeWL MCU Package
• Support of a wide choice of Integrated Development Environments (IDEs) including IAR Embedded
Workbench®, MDK-ARM, and STM32CubeIDE
Note: Arm is a registered trademark of Arm Limited (or its subsidiaries) in the US and/or elsewhere.
UM3127
Features
UM3127 - Rev 1 page 2/47

2 Ordering information
To order the B-WL5M-SUBG1 STM32WL connectivity expansion board, refer to Table 1. Additional information is
available from the datasheet and reference manual of the target microcontroller.
Table 1. List of available products
Order code Board reference Target STM32
B-WL5M-SUBG1 • MB1779(1)
• MB1880(2) STM32WL5MOCH6TR
1. Expansion board
2. STMod+ adapter board
2.1 Codification
The meaning of the codification is explained in Table 2.
Table 2. Codification explanation
B-XXYY-ZZZZT Description Example: B-WL5M-SUBG1
B Expansion board Connectivity expansion board
XX MCU series in STM32 32-bit Arm Cortex MCUs STM32WL series
YY MCU product line in the series STM32WL5M line
ZZZZ Wireless network Sub‑gigahertz wireless network based on LoRa®, (G)FSK,
(G)MSK, and BPSK modulations
T Sequential number First SUBG connectivity expansion board
UM3127
Ordering information
UM3127 - Rev 1 page 3/47

3 Development environment
The B-WL5M-SUBG1 STM32WL connectivity expansion board runs with the STM32WL5MOC module including
the STM32WL5MOCH6 32-bit microcontroller based on the Arm® Cortex®‑M4/M0+ processor.
3.1 System requirements
• Multi‑OS support: Windows® 10, Linux® 64-bit, or macOS®
• USB Type-A or USB Type-C® to USB Type-C® cable
Note: macOS® is a trademark of Apple Inc., registered in the U.S. and other countries and regions.
Linux® is a registered trademark of Linus Torvalds.
Windows is a trademark of the Microsoft group of companies.
3.2 Development toolchains
•IAR Systems® - IAR Embedded Workbench®(1)
•Keil® - MDK-ARM(1)
• STMicroelectronics - STM32CubeIDE
1. On Windows® only.
UM3127
Development environment
UM3127 - Rev 1 page 4/47

4 Conventions
Table 3 provides the conventions used for the ON and OFF settings in the present document.
Table 3. ON/OFF convention
Convention Definition
Jumper JPx ON Jumper fitted
Jumper JPx OFF Jumper not fitted
Jumper JPx [1-2] Jumper fitted between Pin 1 and Pin 2
Solder bridge SBx ON SBx connections closed by 0 Ω resistor
Solder bridge SBx OFF SBx connections left open
Resistor Rx ON Resistor soldered
Resistor Rx OFF Resistor not soldered
Capacitor Cx ON Capacitor soldered
Capacitor Cx OFF Capacitor not soldered
UM3127
Conventions
UM3127 - Rev 1 page 5/47

5 Quick start
The B-WL5M-SUBG1 STM32WL connectivity expansion board product is an easy‑to‑use and low‑cost
development kit used to evaluate and start development quickly with an STM32WL5MOC module. Before
installing and using the product, accept the evaluation product license agreement from the www.st.com/epla web
page. For more information on the B-WL5M-SUBG1 STM32WL connectivity expansion board product and
demonstration software, visit the www.st.com/stm32nucleo web page.
5.1 Getting started
Follow the sequence below to configure the product and launch the demonstration application (refer to Figure 3
for component location):
1. Check jumper positions on board, JP2 (IDD) ON, JP1 (internal) OFF. The default jumper position on the board
is explained in Table 4.
2. Supply the B-WL5M-SUBG1 STM32WL connectivity expansion board (MB1779). You can, for example,
connect a supply cable at CN4 to supply the board with 5 V (5EV).
3. Connect the B-WL5M-SUBG1 STM32WL connectivity expansion board (MB1779) to an external STLINK-
V3SET debugger through the CN3 connector of the MB1779 board. Connect the external STLINK-V3SET
debugger to a PC with a standard USB cable. Then the LED4 (5V_PWR) green LED lights up, and the LED3
red LED flashes quickly.
4. On the PC, connect a UART terminal to the board using the following settings:
– UART terminal: new line received = auto; new line transmit = LF (line feed)
– Serial port setting: Select COM port number, 9600 baud rate, 8-bit data, parity none, one stop bit, and no
flow control
5. Press on the SW2 reset button of the B-WL5M-SUBG1 STM32WL connectivity expansion board (MB1779).
– The MB1779 board remains silent until it gets a command from the connected PC to start sending a
beacon on one of the beacon frequencies.
– The frequency is selected depending on the region.
– After the version check, the first three commands to send to the PC must set region, subregion, and
start the beacon (AT+REGION=x and AT_BEACON_ON). The first two commands select the format of
the transmission beacon. The third command starts sending the beacon.
– For a list of available regions run AT_LIST_REGIONS.
6. Then a concentrator (for example a NUCLEO-WL55JC1 board) starts flashing a green LED on each time slot
of the network.
7. To get the demonstration fully up and running, up to 14 B-WL5M-SUBG1 STM32WL connectivity expansion
board (MB1779) demonstration sensors can be flashed and placed against a Nucleo demonstration
concentrator.
8. This demonstration application software is available on the www.st.com website.
Table 4. Jumper default configuration
Jumper Definition Position(1) Comment
JP2 IDD ON For STM32WL5MOC current
measurements (RF part)
1. The default jumper state is shown in bold.
UM3127
Quick start
UM3127 - Rev 1 page 6/47

6 Hardware layout and configuration
6.1 CEB MB1779 board
The CEB (connectivity expansion board) MB1779 board is designed around the STM32WL5MOC module, which
includes an STM32 microcontroller in a 73‑pin UFBGA package. Figure 2 shows the connections between the
STM32WL5MOC module and its peripherals, push-buttons, LEDs, USB, and sensors. Figure 3 and Figure 4 show
the location of these features on the CEB MB1779 board. The mechanical dimensions of the board are shown in
Figure 5.
Figure 2. MB1779 hardware block diagram
DT59126V1
STM32WL55
Reset
button
GPIO
DEBUG
IDD
32 MHz
TCXO
Blue user LED (LD1)
Green 5V_PWR
LED (LD4)
User
button
Green User LED (LD2) Red User LED (LD3)
RF switch/
control
and
RF
matching
SMA
connector
(CN2)
VCP SWD
32 kHz
Crystal
STM32WL5MOC module
ST-SAFE
STMod+
connector
(CN1)
E5V
Temperature
sensor (U14)
Barometer
(U4)
Accelerometer-
gyroscope
(U2)
Magnetometer
(U7)
I2C
SPI
Serial flash
memory
I2C bus
EEPROM
(CN4)
(U10)
(U8)
(U14)
(U4)
(U2)
(U7)
(SW2) (SW1)(CN3)
(U3)
(JP2)
6.1.1 MB1779 PCB layout
Figure 3. MB1779 top layout
Product
sticker
Barometer (U4)
E5V supply
connector
(CN4)
STM32WL5M module
(U3)
3V3 regulator (U6)
SMA antenna
connector
(CN2)
3D accelerometer and 3D gyroscope (U2)
E3V3 supply
connector
(CN5)
STDC14 debug
Connector
(CN3)
USER button
(SW1)
I2C EEPROM
(U8)
Magnetometer
(U7)
Temperature sensor
(U14) CMOS
serial flash memory
(U10) User LEDs
(LD1, LD2,
and LD3)
RESET button
(SW2)
IDD jumper for
current measurement
(JP2 ON)
STMod+
connector
(CN1)
DC switches
(U1 and U5)
UM3127
Hardware layout and configuration
UM3127 - Rev 1 page 7/47

Figure 4. MB1779 bottom layout
DT59129V1
EMS sticker
(reserved for EMS)
Board sticker
SMA antenna
connector
(CN2)
E5V supply
connector
(U15)
UID64 sticker
STMod+
connector
(CN1)
• The UID64 sticker:
A 64-bit unique device identification (UID64) is stored in the flash memory and can be accessed by the
CPUs, at 0x1FFF7580 base address.
The UID64 sticker displays the UID information (16 digits as 64‑bit codification, displayed in little‑endian
bytes) which is unique for each STM32WL5MOC module.
• The EMS sticker:
This sticker is an internal follow‑up sticker for the EMS subcontractor. Do not take it into account.
6.1.2 MB1779 mechanical drawing
Figure 5. MB1779 mechanical drawing
UM3127
Hardware layout and configuration
UM3127 - Rev 1 page 8/47

6.2 MB1880 STMod+ adapter board
The MB1880 STMod+ adapter board is a very simple board that allows the MB1779 connectivity expansion board
to become a host with the add-on STMod+ connectors (female).
Figure 6 shows the basic hardware block diagram. Figure 7 and Figure 8 show the location of the main
components of the MB1880 board. The mechanical dimensions of the board are shown in Figure 9.
Figure 6. MB1880 basic hardware block diagram
DT59131V1
JP1
STMod+
connector
(CN2)
STMod+
connector
(CN3)
USB C
(CN1)
JP2
6.2.1 MB1880 PCB layout
Figure 7. MB1880 top layout
DT59132V1
STMod+
connector
(CN2)
Jumper
(JP1)
5V test point
(TP2)
GND test point
(TP1)
Jumper
(JP2)
STMod+
connector
(CN3)
ESDA7P60-1U1M
ESD protection
(U1)
USB Type-C®
connector
(CN1)
UM3127
Hardware layout and configuration
UM3127 - Rev 1 page 9/47

Figure 8. MB1880 bottom layout
DT59133V1
STMod+
connector
(CN3)
Board sticker
EMS sticker
(reserved for EMS)
STMod+
connector
(CN2)
Two stickers (the board sticker and an EMS sticker) are present on the bottom side of the MB1880 board:
1. The board sticker is composed of three parts:
a. Line 1: board reference using the format MBxxxx-Variant-yzz with xxxx as the board reference,
Variant as the board variant, coded on 26 digits maximum, y as the PCB revision, and zz as the
assembly revision, such as 01 or 02.
b. Line 2: board serial number coded on 10 digits syywwxxxxx with s as the subcontractor ID, yy the year of
assembly, ww the week of assembly, and xxxxx the board index number starting from 00001 for each
production batch.
c. QR code: (25x25; 47 characters maximum) encoding lines one and two information. The QR code is
placed on the right of the two lines.
2. The EMS sticker:
This sticker is an internal follow-up sticker for the EMS subcontractor. Disregard it.
6.2.2 MB1880 mechanical drawing
Figure 9. MB1880 mechanical drawing (in millimeters)
UM3127
Hardware layout and configuration
UM3127 - Rev 1 page 10/47