STMicroelectronics B-L462E-CELL1 User manual

Introduction
The B-L462E-CELL1 Discovery kit is a turnkey development platform for cellular IoT devices. The Discovery kit contains a
low-power Discovery main board powered by an LBAD0ZZ1SE module, a global coverage antenna, and a fan-out board.
The LBAD0ZZ1SE module includes an STM32L462REY6TR microcontroller, an LBAD0XX1SC-DM ultra-small LTE Cat M/NB
modem, and an ST4SIM-200M GSMA-certified embedded SIM with a prepaid cellular connectivity data plane. ST4SIM-200M
can also be used as an embedded secure element (eSE) for application.
STMod+ and extended pins connectivity provide unlimited expansion capabilities with a large choice of specialized add-on
boards. Moreover, the fan-out board supports add-on boards using mikroBUS™, ESP‑01, Grove I2C, Grove UART, and
breadboard. The B-L462E-CELL1 Discovery kit includes an ST-LINK debugger/programmer and comes with the comprehensive
STM32Cube software libraries together with packaged software examples to demonstrate end-to-end connectivity.
This document provides information about the Discovery kit hardware features and instruction to run the demonstration
application software.
Figure 1. B-L462E-CELL1 Discovery kit for IoT nodes
Picture is not contractual.
Discovery kit for LTE Cat M/NBIoT with STM32L4 Series
UM2743
User manual
UM2743 - Rev 1 - March 2021
For further information contact your local STMicroelectronics sales office. www.st.com

1Features
• LBAD0ZZ1SE module from Murata powered by STM32L462RE with built-in eSIM (ST4SIM-200M), LTE
Cat M/NBIoT modem (LBAD0XX1SC-DM), and 1 Mbyte of Quad-SPI Flash memory
• Ultra-low-power STM32L4 Series STM32L462REY6TR microcontroller based on the Arm® Cortex®-M4 core
with 512 Kbytes of Flash memory and 160 Kbytes of RAM in a WLCSP64 package
• 64 Mbytes of onboard Quad-SPI Flash memory from Micron®, exclusive with the 1 MByte of Quad-SPI Flash
memory inside the module
• 16 Kbytes of I2C EEPROM (M24128-DFMN6TP) from STMicroelectronics
• 0.96-inch 128 x 64 OLED screen with SPI interface
•Low-power Audio CODEC with PCM bus and I2C interface (MAX9867ETJ+ from Maxim)
• Ultra-low-power 3D accelerometer and 3D magnetometer (LSM303AGR) from STMicroelectronics
• Capacitive digital sensor for relative humidity and temperature (HTS221) from STMicroelectronics
• 260-1260 hPa absolute digital output barometer (LPS22HH) from STMicroelectronics
• 3 user LEDs
• 2 push-buttons (user and reset)
• Board connectors:
– SMA antenna connector
– Two 50-pin 2.54 mm pitch headers
– STMod+
– micro-SIM card slot
– 3.5 mm CTIA stereo headset jack including analog microphone input
– USB Micro-B connectors for power, USARTs, USB device, and ST-LINK/V2-1
– TAG10
– mikroBUS™ expansion connectors
– ESP‑01 expansion connector
– Grove Seeed Studio™ breadboard, I2C, and UART expansion connectors
• Flexible power-supply options: ST-LINK USB, User USB, UART USB, Power USB, or three AAA batteries
• On-board ST-LINK/V2-1 debugger/programmer with USB re-enumeration capability: mass storage, Virtual
COM port, and debug port
• End-to-end connectivity applications
• Low‑power cellular network services from Truphone®
• 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.
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Features
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2Ordering information
To order the B-L462E-CELL1 Discovery kit for IoT nodes, refer to Table 1. Additional information is available from
the datasheet and reference manual of the target STM32.
Table 1. Ordering information
Order code Board references Target STM32
B-L462E-CELL1 • MB1508
• MB1280(1) STM32L462REY6TR
1. Fan-out board.
2.1 Codification
The meaning of the codification is explained in Table 2.
Table 2. Codification explanation
B-L462E-CELL1 Description B-L462E-CELL1
B Discovery kit with a variety of sensors Sensor node
L462 MCU product line in STM32 32-bit Arm Cortex MCUs STM32L462 in the STM32L4 Series
ESTM32 Flash memory size:
• E for 512 Kbytes 512 Kbytes
CELL Dedicated to cellular applications Discovery kit for cellular applications
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Ordering information
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3Development environment
The B-L462E-CELL1 Discovery kit for IoT nodes runs with the STM32L462RE 32-bit microcontroller based on the
Arm® Cortex®-M4 core.
3.1 System requirements
• Windows® OS (7, 8, or 10), Linux® 64-bit, or macOS®
• USB Type-A or USB Type-C® to Micro-B cable
Note: macOS® is a trademark of Apple Inc. registered in the U.S. and other countries.
Linux® is a registered trademark of Linus Torvalds.
All other trademarks are the property of their respective owners.
3.2 Development toolchains
• IAR Systems® - IAR Embedded Workbench®(1)
• Keil® - MDK-ARM(1)
• STMicroelectronics - STM32CubeIDE
1. On Windows® only.
3.3 Demonstration software
The demonstration software, included in the STM32Cube MCU Package corresponding to the on-board
microcontroller, is preloaded in the STM32 Flash memory for easy demonstration of the device peripherals in
standalone mode. The latest versions of the demonstration source code and associated documentation can be
downloaded from www.st.com.
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Development environment
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4Conventions
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
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Conventions
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5Delivery recommendations
Before first use, check the board for any damage that might have occurred during shipment, that all socketed
components are firmly fixed in their sockets and that none are loose in the plastic bag.
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Delivery recommendations
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6References
Murata provides access to documents and support from CatM1/NB-IoT Type1SE support site for customers who
purchase Evaluation kits for the Type1SE family. Follow the instruction provided in the Murata Type1SE overview
to access the mymurata website and use the code found on the B-L462E-CELL1 insert card.
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References
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7Hardware layout and configuration
The B-L462E-CELL1 Discovery kit for IoT nodes is designed around the LBAD0ZZ1SE Murata module. The
hardware block diagram (Refer to Figure 2) illustrates the connection between LBAD0ZZ1SE and peripherals:
OLED screen, sensors, USB FS connector, USARTs, audio, EEPROM, micro SIM card, and embedded ST-LINK/
V2-1. Figure 3 and Figure 4 help the user to locate these features on the B-L462E-CELL1 Discovery kit for IoT
nodes. Figure 5 and Figure 6 give the mechanical dimensions of the B-L462E-CELL1 board.
Figure 2. Hardware block diagram
LBAD0ZZ1SE
MCU Part Modem
Part
SWD
UART1
QSPI1
USB
SPI3
I2C1
GPIO
TIMER
PCM
SIM
UART1
UART2
RF
TAG10
STLINK/V2-1
QSPI
Flash
OLED
Sensors
Tamper
button
LEDs
Level shifter
SMA
Connector
SIM card
slot
Codec Audio
jack
USB-UART
converter Micro-USB
I2C0
EEPROM
Micro-USB
Micro-USB
Extension
connector CN12
Stmod+
connector GPIO Extension
connector CN13
Power USB
Battery
ST4SIM eSE interface
eSE interface
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Hardware layout and configuration
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Figure 3. B-L462E-CELL1 Discovery kit for IoT nodes (top view)
SMA connector (CN1)
STMod+(P1)
OLED screen (U1)
Reset button (B1)
User button (B2)
Sensor interrupt
pins (CN7)
User USB (CN8)
USB UART (CN10)
USB ST-LINK (CN9)
USB PWR (CN11)
TAG10 (CN3)
LSM303AGR (U7)
HTS221 (U10)
LPS22HH (U6)
LBAD0ZZ1SE (U5)
ST-LINK MCU (U12)
Flash (U8)
SIM card slot (CN2)
User LED(LD1,LD2,LD3)
ST-LINK COM (LD6)
Current measurement
jumper (JP1)
1.8V LDO (U19)
Modem LED status
(PSM and TX)
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Figure 4. B-L462E-CELL1 Discovery kit for IoT nodes (bottom view)
EEPROM (U23)
Audio jack (CN14)
Pins to MCU (CN12)
Pins to modem (CN13)
Audio codec (U24)
3.3V LDO (U25)
3.6V LDO (U30)
Level shifters
(U27, U28, and U29)
Battery case (BT1)
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Figure 5. B-L462E-CELL1 Discovery kit for IoT nodes mechanical drawing (top view)
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Figure 6. B-L462E-CELL1 Discovery kit for IoT nodes mechanical drawing (bottom view)
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7.1 Embedded STLINK/V2-1
The ST-LINK/V2-1 programming and debugging tool is integrated on the B-L462E-CELL1 Discovery kit for IoT
nodes. Compared to the ST-LINK/V2 the changes are listed below.
The new features supported on the ST-LINK/V2-1 are:
• USB software re-enumeration
• Virtual COM port interface on USB
• Mass storage interface on USB
• USB power management request for more than 100 mA power on USB
The following features are no more supported on the ST-LINK/V2-1:
• SWIM interface
• Application voltage lower than 3 V
For all general information concerning debugging and programming features common between V2 and V2-1
versions, refer to user manual ST-LINK/V2 in-circuit debugger/programmer for STM8 and STM32 (UM1075) at the
www.st.com website.
7.1.1 Drivers
The ST-LINK/V2-1 requires a dedicated USB driver, which, for Windows 7®, Windows 8® and Windows 10®, is
found at www.st.com.
In case the B-L462E-CELL1 Discovery kit for IoT nodes is connected to the PC before the driver is installed,
some Discovery board interfaces may be declared as “Unknown” in the PC device manager. In this case, the user
must install the dedicated driver files, and update the driver of the connected device from the device manager as
shown in Figure 7.
Note: Prefer using the “USB Composite Device” handle for a full recovery.
Figure 7. USB composite device
7.1.2 ST-LINK/V2-1 firmware upgrade
The ST-LINK/V2-1 embeds a firmware upgrade mechanism for the in-situ upgrade through the USB port. As the
firmware may evolve during the lifetime of the ST-LINK/V2-1 product (for example new functionalities, bug fixes,
support for new microcontroller families), it is recommended to visit the www.st.com website before starting to
use the B-L462E-CELL1 Discovery kit for IoT nodes and periodically, to stay up-to-date with the latest firmware
version.
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Embedded STLINK/V2-1
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7.1.3 Target voltage level on STM32CubeProgrammer
The target voltage level is shown on the STM32CubeProgrammer. On the B-L462E-CELL1 Discovery kit for IoT
nodes, the target (STM32L462RE on the module) voltage is 1.8 V.
Note: To reduce the power consumption for low ‑ power measurement, the value of R62 and R55 sampling resistors is
raised from 4.7 kΩ to 1 MΩ. In this case, the target voltage can not be correctly measured by ST-LINK and may
be displayed as 1.6 V on STM32CubeProgrammer.
7.2 Power supply
The B-L462E-CELL1 Discovery kit for IoT nodes is designed to be powered by a 5 V DC power supply. It is
possible to configure the B-L462E-CELL1 Discovery kit for IoT nodes to use any of the following five sources
for the power supply: UartUsbVbus, Vbus, 5V_USB_CHG, 5V_USB_PWR, and EXT_BAT. Power sources are
automatically selected by diodes.
All extern power sources are connected to the JP1 jumper, so JP1 can be used to measure the current which is
consumed by the module.
• UartUsbVbus is provided by the CN10 UART USB connector.
• Vbus is provided by the CN8 user USB connector.
• 5V_USB_CHG is provided by the CN9 ST-LINK/V2-1 USB connector. This power source can be controlled
by the onboard ST-LINK/V2-1.
• 5V_USB_PWR is provided by the CN11 power USB connector.
• EXT_BAT is connected to a battery case that contains three AAA batteries. As it can only provide a 4.5 V
power source, this power source is not designed for long-time and huge-current applications. Low-power
applications can consider using this as the main power source and other applications may use this as the
back-up power source.
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Power supply
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Figure 8. Power tree
USB_ST_LINK
USB_UART
USB_DEVICE
USB_PWR
Battery
3.3 V LDO
ST1L05BPUR
3.6 V LDO
ST1L05BPUR
1.8 V LDO
ST1L05BPUR
0.96-inch
OLED
ST-LINK/V2-1 3.3 V LDO
LD3985M33R
LBAD0ZZ1SE
Quad-SPI
Flash
Audio codec
LSM303AGR
LPS22HH
HTS221
VDDIO_MDM
VDDIO
VDDIO
SIM card
VDD_SIM
USB to UART
I/O level-
translation
EEPROM
1.8 V
1V8_MD
SB34
SB33
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Power supply
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7.3 Clock source
One clock source is described below:
• X1 8 MHz clock for the ST-LINK MCU.
The other clock source is the 32.768 KHz in the module which is used to be the RTC clock source for the
STM32L462RE microcontroller.
7.4 Reset sources
The reset signal of the B-L462E-CELL1 Discovery kit for IoT nodes is active LOW and the reset sources include:
• A reset button B1
• An embedded ST-LINK/V2-1
• A TAG10 connector reset pad
7.5 USB device FS
The B-L462E-CELL1 Discovery kit for IoT nodes supports USB device function via the CN8 USB Micro-B
connector.
7.6 Quad-SPI NOR Flash memory
64 Mbytes of onboard Quad-SPI Flash memory (MT25QU512ABB1EW9-0SIT from Micron) is connected to the
Quad-SPI interface of STM32L462RE in LBAD0ZZ1SE. The Flash shares the same QSPI IO as on‑module Flash
memory. So solder bridge is used to select the target Flash memory (SB43 is OFF and SB28 is ON). On‑module
Flash is used by default.
7.7 Virtual COM port
The serial interface USART1 is directly available as a Virtual COM port of the PC connected to the CN9 ST-LINK/
V2-1 USB connector. The Virtual COM port settings are configured with 115200 bps, 8‑bit data, no parity, one stop
bit, and no flow control.
7.8 STMicroelectronics sensors
Several STMicroelectronics sensors are available on the B-L462E-CELL1 Discovery kit for IoT nodes and are
listed below:
• Ultra-low-power 3D accelerometer and 3D magnetometer (LSM303AGR)
• 260 hPa to 1260 hPa absolute digital output barometer (LPS22HH)
• Capacitive digital sensor for relative humidity and temperature (HTS221)
7.8.1 Ultra-low-power 3D accelerometer and 3D magnetometer (LSM303AGR)
LSM303AGR is an ultra-low-power high-performance system-in-package featuring a 3D digital linear acceleration
sensor and a 3D digital magnetic sensor.
LSM303AGR has linear acceleration full scales of ±2g/±4g/±8g/16g and a magnetic field dynamic range of
±50 gauss.
LSM303AGR includes an I2C serial bus interface that supports standard, fast mode, fast mode plus, and high-
speed (100 kHz, 400 kHz, 1 MHz, and 3.4 MHz) and an SPI serial standard interface. On the B-L462E-CELL1
Discovery kit for IoT node the I2C1 bus from the STM32L462REY6TR is used.
The system can be configured to generate an interrupt signal for free-fall, motion detection, and magnetic field
detection.
The magnetic and accelerometer blocks can be enabled or put into power-down mode separately.
LSM303AGR is available in a plastic land grid array package (LGA) and is guaranteed to operate over an
extended temperature range from -40 °C to +85 °C.
• 3 magnetic field channels and 3 acceleration channels
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Clock source
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• ±50 gauss magnetic dynamic range
• ±2/±4/±8/16 g selectable acceleration full scales
• 16-bit data output
• SPI / I2C serial interfaces
• Analog supply voltage 1.71 V to 3.6 V
• Power-down mode / low-power mode
• Current consumption in power-down: 2 μA
• Accelerometer current consumption Magnetic sensor in power-down mode, 50 Hz ODR in low-power
mode:7.7uA
• Programmable interrupt generators for freefall, motion detection, and magnetic field detection
• Embedded self-test
• Embedded temperature sensor
• Embedded FIFO
•ECOPACK®, RoHS, and “Green” compliant
7.8.2 260 hPa to 1260 hPa absolute digital output barometer (LPS22HH)
The absolute pressure-sensing device LPS22HH is an ultra-compact piezoresistive sensor that functions as a
digital output barometer.
The device comprises a sensing element and an IC interface which communicates from the sensing element
to the application through I2C or SPI. On the B-L462E-CELL1 Discovery kit for IoT nodes, the I2C1 bus from
STM32L462REY6TR is used.
The sensing element, which detects absolute pressure, consists of a suspended membrane manufactured using a
dedicated process developed by ST.
LPS22HH is available in a full-mold, holed LGA package (HLGA). It is guaranteed to operate over a temperature
range extending from -40 °C to +85 °C. The package is holed to allow external pressure to reach the sensing
element.
The main features of LPS22HH are:
• From 260 hPa to 1260 hPa absolute pressure range
• Current consumption down to 4 μA
• Absolute pressure accuracy: 0.5 hPa
• Low-pressure sensor noise: 0.65 Pa
• High-performance TCO: 0.65 Pa/°C
• Embedded temperature compensation
• 24-bit pressure data output
• ODR from 1 Hz to 200 Hz
• SPI, I2C, or MIPI I3CSM interfaces
• Embedded FIFO
• Interrupt functions: Data-Ready, FIFO flags, pressure thresholds
• Supply voltage: from 1.7 to 3.6 V
• High shock survivability: 22,000 g
• Small and thin package
• ECOPACK® lead-free compliant
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STMicroelectronics sensors
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7.8.3 Capacitive digital sensor for relative humidity and temperature (HTS221)
HTS221 is an ultra-compact sensor for relative humidity and temperature. It includes a sensing element and a
mixed-signal ASIC to provide the measurement information through digital serial interfaces.
The sensing element consists of a polymer dielectric planar capacitor structure capable of detecting relative
humidity variations and it is manufactured using a dedicated ST process.
HTS221 is available in a small top-holed cap land grid array (HLGA-6L 2 mm x 2 mm x 0.9 mm) package
guaranteed to operate over a temperature range from -40 °C to +120 °C.
The main features of HTS221 are:
• 0 to 100% relative humidity range
• Low-power consumption: 2 μA @ 1 Hz ODR
• Selectable ODR from 1 Hz to 12.5 Hz
• High relative humidity (rH) sensitivity: 0.004% rH/LSB
• Humidity accuracy: ± 3.5% rH, from +20% to +80% rH
• Temperature accuracy: ± 0.5 °C, from +15 °C to +40 °C
• Embedded 16-bit ADC
• 16-bit humidity and temperature output data
•SPI and I2C interfaces. On the B-L462E-CELL1 Discovery kit for IoT nodes, the I2C1 bus from
STM32L462REY6TR is used.
• Factory calibrated: Tiny 2 mm x 2 mm x 0.9 mm package
• ECOPACK® compliant
7.9 EEPROM (M24128-DFMN6TP)
128-Kbit serial I²C bus EEPROM(M24128-DFMN6TP) is connected to the I2C1 interface of STM32L462REY6TR.
Its features are:
• Compatible with all I2C bus modes: – 1 MHz – 400 kHz – 100 kHz
• Memory array:
– 128 Kbits (16 Kbytes) of EEPROM
– Page size: 64 bytes
– Additional Write lockable page (M24128-D order codes)
• Single supply voltage and high speed: 1 MHz clock from 1.7 V to 5.5 V
• Standby supply current: 1uA, device not selected, VIN = VSS or VCC, VCC = 1.8 V
• Write:
– Byte Write within 5 ms
– Page Write within 5 ms
• Operating temperature range from -40 °C up to +85 °C
• Random and Sequential Read modes
• Write protect of the whole memory array
• Enhanced ESD/Latch-Up protection
• More than 4 million write cycles
• More than 200-years data retention
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EEPROM (M24128-DFMN6TP)
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7.10 OLED screen
9OL9935701000 is a 0.96-inch OLED screen with the SSD1315Z driver IC. On the B-L462E-CELL1 Discovery kit
for IoT nodes, the SPI3 bus from STM32L462REY6TR is used to connect this OLED screen. It has the following
features:
• Small molecular organic light-emitting diode
• Color: White
• Panel matrix: 128x64
• Driver IC: SSD1315Z
• Excellent quick response time
• Extremely thin thickness for best mechanism design: 1.42 mm
• High contrast: 2000:1
• Wide viewing angle: 160°
• 3/4 wire Serial Peripheral Interface
• Wide range of operating temperature: -40 °C to 70 °C
• Anti-glare polarizer
Note: The SPI3 is also shared with ST4SIM-200M. As ST4SIM is powered by the modem power supply, there is a
need to control the LDO at the modem side by sending related AT commands.
7.11 Audio codec
MAX9867ETJ+ is an ultra-low-power stereo audio codec designed for portable consumer devices such as mobile
phones and portable gaming consoles. The codec is connected to the modem through the PCM bus which is
used to transmit voice data and the I2C bus which provides a control for volume levels, signal mixing, and general
operating modes. Its I2C address for write commands is 0x30.
Note: VoLTE and audio features are not used in the current version of the LBAD0ZZ1SE module. The customer must
contact Murata to enable such an option as needed.
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OLED screen
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7.12 Buttons and LEDs
The B1 black button located on the top left side is the reset of the STM32L462REY6TR microcontroller. Refer to
Figure 3.
The B2 blue button located on the top left side is used as a digital input or as an alternate wake-up function.
When the button is depressed the logic state is LOW, otherwise, the logic state is HIGH.
Three LEDs (LD1, LD2, and LD3), located on the top left side are available for the user. To light a LED a logic
state HIGH must be written in the corresponding GPIO. As the GPIOs can be connected to timers in the chip, the
user may use the PWM function to control the brightness of LEDs.
Table 4. Button and LED control port
Reference Color Name Comment
B1 Black Reset -
B2 Blue Wake-up Alternate function Wake-up
LD1 Green User LED1 PC6
LD2 Red User LED2 PB15
LD3 Blue User LED3 PB14
LD4 Green LED4
PSM_IND, controlled by the modem, lights
ON when the modem is not in low‑power
mode, and OFF when the modem is in
low‑power mode.
LD5 Green LED5 TX_IND, controlled by the modem
reference Bicolor (red and green) ST-LINK COM Green during communication
LD7 Red Fault Power Current upper than 750 mA
7.13 I2C addresses of modules used on MB1508
Table 5 displays the I2C read and write addresses for the modules that are connected to the I2C1 bus.
Table 5. I2C addresses for each module
Modules Description SAD[6:0] + R/W I2C write address I2C read address
HTS221 Capacitive digital sensor for relative
humidity and temperature 1011111X 0xBE 0xBF
LPS22HH MEMS nano pressure sensor 1011101x
(SDA[0]=1])
0xBA 0xBB
LSM303AGR 3D accelerometer and 3D
magnetometer
0011001x
(Linear
acceleration)
0x32
(Linear
acceleration)
0x33
(Linear
acceleration)
0011110x
(Magnetic field)
0x3C
(Magnetic field)
0x3D
(Magnetic field)
M24128-
DFMN6TP 128-Kbit serial I2C bus EEPROM
1010000x
(Memory array)
0xA0
(Memory array)
0xA1
(Memory array)
1011000x
(Identification
page)
0xB0
(Identification
page)
0xB1
(Identification
page)
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