ST B-L462E-CELL1 User manual

UMxxxx
User Manual
B-L462E-CELL1 Discovery kit for NB/M1 communication
Discovery Board
Introduction
The B-L462E-CELL1 Discovery pack (B-L462E-CELL1) is a turnkey development platform for
the IoT and cellular technology-based solutions. The pack contains a TYPE-1SE module and
a low-power Discovery mother board with antenna connector. The TYPE-1SE module
includes a STM32L462REY micro-controller and a TYPE-1SC module which is a worldwide
smallest LTE Cat NB1&M1 modem.
STMod+ and extended pins connectivity provides unlimited expansion capabilities with a large
choice of specialized add-on boards.
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 seamlessly connect to cloud servers. In addition, a direct access to the Arm®
mbed Enabled™ on-line resources at Http://mbed.org is available.
Figure 1. B-L462E-CELL1 Discovery kit

Contents
Introduction................................................................................................................................ 1
1Features............................................................................................................................. 4
2Product marking................................................................................................................. 5
3System requirements......................................................................................................... 5
4Development toolchains..................................................................................................... 5
5Demonstration software..................................................................................................... 5
6Ordering information .......................................................................................................... 6
7Hardware layout and configuration.................................................................................... 7
7.1 B-L462E-CELL1 Discovery kit for IoT node layout....................................................... 8
7.2 B-L462E-CELL1 Discovery kit mechanical drawing................................................... 10
7.3 Embedded ST-LINK/V2-1........................................................................................... 11
7.3.1 Drivers.............................................................................................................. 11
7.3.2 ST-LINK/V2-1 firmware upgrade...................................................................... 11
7.4 Power supply.............................................................................................................. 12
7.5 Clock sources............................................................................................................. 14
7.6 Reset sources ............................................................................................................ 14
7.7 USB DEVICE FS........................................................................................................ 14
7.8 Quad-SPI NOR Flash memory................................................................................... 14
7.9 Virtual COM port......................................................................................................... 14
7.10 ST sensors ............................................................................................................... 14
7.10.1 Ultra-low-power 3D accelerometer and 3D magnetometer (LSM303AGR)... 14
7.10.2 260-1260 hPa absolute digital output barometer (LPS22HH) ....................... 15
7.10.3 Capacitive digital sensor for relative humidity and temperature (HTS221) ... 16
7.11 EEPROM (M24128-DFMN6TP)............................................................................... 16

7.12 OLED screen............................................................................................................ 16
7.14 Buttons and LEDs .................................................................................................... 17
7.15 I2C addresses of modules used on MB1508 ........................................................... 18
8 Connectors ........................................................................................................................... 19
8.1 SMA connector for antenna ........................................................................................ 19
8.2 SIM card slot............................................................................................................... 19
8.3 Tag connector ............................................................................................................ 20
8.4 ST-LINK select jumper............................................................................................... 21
8.5 ST-LINK debug connector.......................................................................................... 21
8.6 reserved U.FL connector............................................................................................ 22
8.7 INT pins of sensors .................................................................................................... 22
8.8 USB connector for User Device ................................................................................. 22
8.9 USB connector for ST-LINK....................................................................................... 23
8.10 USB connector for UART......................................................................................... 23
8.11 USB connector for power......................................................................................... 24
8.12 Extension pin header for MCU................................................................................. 25
8.13 Extension pin header for Modem ............................................................................. 26
8.14 3.5mm stereo headphone connector ....................................................................... 27
8.15 Socket 10X2 STMod+ .............................................................................................. 28
8.16 Jumper JP1 for IDD measurements......................................................................... 28
Appendix A B-L462E-CELL1 Discovery kit I/O assignment................................................. 29

1 Features
•TYPE-1SE module including TYPE-1SC and STM32L462REY
•STM32L462REY micro-controller featuring 512 KB of Flash memory and 160 KB of RAM
in WLCSP64 package
•TYPE-1SC modem featuring LTE Cat M1/NB1 in LGA pack
•0.96-inch 128 x 64 OLED screen with SPI interface
•64Mbytes Quad-SPI(Micron) Flash memory
•ST 16Kbyte IIC EEPROM (M24128-DFMN6TP)
•Ultra-low-power 3D accelerometer and 3D magnetometer (LSM303AGR)
•Capacitive digital sensor for relative humidity and temperature (HTS221)
•260-1260 hPa absolute digital output barometer (LPS22HH)
•3 user LEDs connected to timers
•2 push-buttons (User and reset)
•Board expansion connectors:
- SMA antenna connector
- Two 50 Pin and 2.54-mm pin pitch headers
- SIM card slot
- 3.5mm CTIA stereo headset jack including analog microphone input
- Micro-B USB connectors for power, USARTs, USB device and ST-LINK V2-1
- STMod+
- TAG10
•Flexible power-supply options: ST-LINK USB, User USB, UART USB, Power USB or 3 x
AAA battery
•On-board ST-LINK/V2-1 debugger/programmer with USB re-enumeration capability:
mass storage, virtual COM port and debug port
•Comprehensive free software including a variety of examples, as part of the STM32Cube
package, as well as a cloud connector software expansion, enabling direct access to
cloud servers
•Support of wide choice of Integrated Development Environments (IDEs) including IAR™,
Keil®, GCC-based IDEs, Arm® mbed Enabled™
•Arm® mbed Enabled™ (see Http://mbed.org)

2 Product marking
Evaluation tools marked as "ES" or "E" are not yet qualified and therefore they are not ready
to be used as reference design or in production. Any consequences deriving from such usage
will not be at ST charge. In no event, ST will be liable for any customer usage of these
engineering sample tools as reference design or in production.
"E" or "ES" marking examples of location:
•On the targeted STM32 that is soldered on the board (for illustration of STM32 marking,
refer to the section “Package characteristics” of the STM32 datasheet at www.st.com).
•Next to the evaluation tool ordering part number, that is stuck or silk-screen printed on the
board.
3 System requirements
•Windows® OS (7, 8 and 10), Linux® or MacOS™
•USB Type-A to Micro-B cable
4 Development toolchains
•Keil® MDK-Arm(a)
•IAR™ EWARM(a)
•GCC-based IDEs including free SW4STM32 from AC6
•Arm® mbed Enabled™ online
5 Demonstration software
The demonstration software, included in the STM32Cube package, 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 the webpage.

6 Ordering information
To order the B-L462E-CELL1 Discovery kit for IoT node, refer to Table 1.
Table 1. Ordering information
Order code
Target STM32
B-L462-CELL1
STM32L462REY

7 Hardware layout and configuration
The B-L462E-CELL1 Discovery kit is designed around the TYPE-1SE module. The hardware
block diagram (see Figure 2) illustrates the connection between TYPE-1SE module and
peripherals (OLED screen, Sensors, USB FS connector, USARTs, EEPROM, Micro-SIM card
and embedded ST-LINK V2-1) and Figure 3 and Figure 4 will help you locate these features
on the actual evaluation board.
Figure 2. Hardware block diagram
1SE ModuleMCU Part Modem
Part
SWD
UART
QSPI
USB
SPI
I2C
GPIO
TIMER
SIM
UART1
UART2
RF
TAG10
STLINK V2-1
QSPI
Flash
OLED
Sensors
Tamper
Button
LEDs
Level shifter
SMA
Connector
SIM card
slot
USB-UART
Converter MicroUSB
I2C
EEPROM
MicroUSB
MicroUSB
Extension
connector CN12
Stmod+
Connector
GPIO Extension
connector CN13

7.1 B-L462E-CELL1 Discovery kit for IoT node layout
Figure 3. B-L462E-CELL1 Discovery kit (top view)
SMA connecor(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)
TYPE-1SE(U5)
ST-LINK MCU(U12)
Flash(U8)
SIM card slot(CN2)
User LED(LD1,LD2,LD3) ST-LINK COM (LD6)
Current measure
jumper(JP1)
1.8V LDO(U19)

Figure 4. B-L462E-CELL1 Discovery kit (bottom view)
EEPROM(U23)
Pins to
MCU(CN12)
Pins to
Modem(CN13)
3.3V LDO(U25)
3.6V LDO(U30)
Level shifter
(U27,U28,U29)
Battery case(BT1)

7.2 B-L462E-CELL1 Discovery kit mechanical drawing
Figure 5. B-L462E-CELL1 Discovery kit mechanical drawing

7.3 Embedded ST-LINK/V2-1
The ST-LINK/V2-1 programming and debugging tool is integrated on the B-L462E-CELL1
Discovery kit. 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 ST-LINK/V2 in-circuit debugger/programmer for
STM8 and STM32 User manual (UM1075) at the www.st.com website.
7.3.1 Drivers
Before connecting discovery kit to a Windows® PC (7, 8 or 10) via USB, a driver for the ST-
LINK/V2-1 must be installed. It is available at the www.st.com website.
In case the B-L462E-CELL1 Discovery kit is connected to the PC before the driver is installed,
some B-L462E-CELL1 Discovery kit interfaces may be declared as “unknown” in the PC
device manager. In this case the user must install the driver files, and update the driver of the
connected device from the device manager (see Figure 6).
Note: Prefer using the “USB Composite Device” handle for a full recovery.
Figure 6. USB Composite Device
7.3.2 ST-LINK/V2-1 firmware upgrade
The ST-LINK/V2-1 embeds a firmware upgrade mechanism for 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 node and periodically, to stay up-to-date with the latest firmware version.
7.4 Power supply
The B-L462E-CELL1 Discovery kit is designed to be powered by 5V DC power supply. It is
possible to use any of the following five sources for the power supply: UartUsbVbus, Vbus,
5V_USB_CHG, 5V_USB_PWR, EXT_BAT. Power sources are selected automatically by
diodes.
All extern power sources are connected to the JP1, so we can use the JP1 to measure
current which is consumed by the module.
•UartUsbVbus is provided by the UART USB connector (CN10).
•Vbus is provided by the User USB connector (CN8).
•5V_USB_CHG is provided by the ST-LINK/V2-1 USB connector (CN9). This power
source can be controlled by the on-board ST-Link V2-1.
•5V_USB_PWR is provided by the power USB connector (CN11).
•EXT_BAT is connected to a battery case which contains 3 AAA battery. As it can provide
only 4.5V power source, this power source is not designed for the long-time and huge-
current applications. Low-power applications can consider to use this as the main power
source and other applications may use this as the back-up power source.

Figure 7 Power tree
USB_ST_LIN
K
USB_UART
USB_DEVICE
USB_PWR
Battery
3.3V LDO
ST1L05BPUR
3.6V LDO
ST1L05BPUR
1.8V LDO
ST1L05BPUR
0.96-inch
OLED
ST-LINK V2-1 3.3V LDO
LD3985M33R
TYPE-1SE
Quad-SPI
Flash
LSM303AGR
LPS22HH
HTS221
VDDIO
VDDIO
SIM Card
VDD_SIM
USB to UART
I/O level-
translation
EEPROM

7.5 Clock sources
One clock source is described below:
•X1 which is the 8MHz clock source for ST-LINK MCU.
The other one clock source is the 32.768KHz clock source in the module which is used to be
the RTC clock source for STM32L462REY.
7.6 Reset sources
The reset signal of the B-L462E-CELL1 Discovery kit is active low and the reset sources
includes:
•A reset button B1
•An embedded ST-LINK/V2-1
•TAG10 connector reset pad
7.7 USB DEVICE FS
The B-L462E-CELL1 Discovery kit supports USB Device function via a USB Micro-B
connector (CN8)
7.8 Quad-SPI NOR Flash memory
512-Mbit Quad-SPI NOR Flash memory (MT25QU512ABB1EW9-0SIT from Micron) is
connected to the Quad-SPI interface of the STM32L462REY in the TYPE-1SE module.
7.9 Virtual COM port
The serial interface USART1 is directly available as a virtual COM port of the PC connected
to the ST-LINK/V2-1 USB connector CN7. The virtual COM port settings are configured as:
115200 b/s, 8 bits data, no parity, 1 stop bit, no flow control.
7.10 ST sensors
Several STMicroelectronics sensors are available on the B-L462E-CELL1 Discovery kit for
IoT node board, they are listed below:
•ultra-low-power 3D accelerometer and 3D magnetometer (LSM303AGR)
•260-1260 hPa absolute digital output barometer (LPS22HH)
•Capacitive digital sensor for relative humidity and temperature (HTS221)
7.10.1 Ultra-low-power 3D accelerometer and 3D magnetometer
(LSM303AGR)
The LSM303AGR is an ultra-low-power high-performance system-in-package featuring a 3D
digital linear acceleration sensor and a 3D digital magnetic sensor.
The LSM303AGR has linear acceleration full scales of ±2g/±4g/±8g/16g and a magnetic field
dynamic range of ±50 gauss.

The 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
STM32L462REY 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.
The 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
•±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
•Programmable interrupt generators for freefall, motion detection and magnetic field
detection
•Embedded self-test
•Embedded temperature sensor
•Embedded FIFO
•ECOPACK®, RoHS and “Green” compliant
7.10.2 260-1260 hPa absolute digital output barometer (LPS22HH)
The absolute pressure-sensing device LPS22HH is an ultra-compact piezoresistive sensor
which 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 node the I2C1 bus from the STM32L462REY is used.
The sensing element, which detects absolute pressure, consists of a suspended membrane
manufactured using a dedicated process developed by ST.
The 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.
•260 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: 1.7 to 3.6 V
•High shock survivability: 22,000 g
•Small and thin package

•ECOPACK® lead-free compliant
7.10.3 Capacitive digital sensor for relative humidity and temperature
(HTS221)
The 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. On the B-L462E-CELL1 Discovery kit for IoT node the I2C1 bus from
the STM32L462REY is used.
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.
The HTS221 is available in a small top-holed cap land grid array (HLGA-6L (2 x 2 x 0.9 mm))
package guaranteed to operate over a temperature range from -40 °C to +120 °C.
The main features of the 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 rH sensitivity: 0.004% rH/LSB
•Humidity accuracy: ±3.5% rH, 20 to +80% rH
•Temperature accuracy: ±0.5 °C,15 to +40 °C
•Embedded 16-bit ADC
•16-bit humidity and temperature output data
•SPI and I2C interfaces. On the STM32L4 Discovery kit for IoT node, the I2C2 bus from
STM32L475VG is used.
•Factory calibrated • Tiny 2 x 2 x 0.9 mm package
•ECOPACK® compliant
7.11 EEPROM (M24128-DFMN6TP)
128-Kbit serial I²C bus EEPROM(M24128-DFMN6TP) is connected to the I2C1 interface of
the STM32L462REY.It’s features are:
•Compatible with all I2C bus modes: –1 MHz –400 kHz –100 kHz
•Memory array: –128 Kbit (16 Kbyte) of EEPROM –Page size: 64 byte –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
•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
7.12 OLED screen
9OL9935701000 is a 0.96-inch OLED screen with the SSD1315Z driver IC. On the B-L462E-
CELL1 Discovery kit for IoT node the SPI3 bus from the STM32L462REY is used to connect
this OLED screen. It has features which are:
•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: 1.42mm
•High contrast: 2000:1
•Wide viewing angle: 160°
•3/4 wire Serial Peripheral Interface
•Wide range of operating temperature: -40 to 70 °C
•Anti-glare polarizer
7.14 Buttons and LEDs
The black button B1 located on top side is the reset of the microcontroller STM32L462REY.
The blue button B2 located top side is available to be used as a digital input or as alternate
wake-up function.
When the button is depressed the logic state is “0”, otherwise the logic state is “1”.
Three LEDs (LD1, LD2 and LD3) located on the top side are available for the user. To light a
LED a high logic state “1” should be written in the corresponding GPIO. As the GPIOs can be
connected to timers in chip, users are allowed to use the PWM function to control the
brightness of LEDs.
Table 2 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
LD5
Green
LED5
TX_IND
reference
Bicolor (red and green)
ST-LINK COM
green when communication
LD7
Red
Fault Power
Current upper than 750 mA

7.15 I2C addresses of modules used on MB1508
The Table 3 displays the IIC address (read and write) for the modules that are connected to
the I2C1 bus.
Table 3 I2C address for each component
Modules
Description
SAR[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
LSM303AG
R
3D
acceleromet
er and 3D
magnetomet
er
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(Identificati
on page)
0xB0(Identificati
on page)
0xB1(Identificati
on page)

8 Connectors
Sixteen connectors are implemented on the B-L462E-CELL1 Discovery kit for IoT node:
•CN1: SMA connector for ant
•CN2: SIM card slot
•CN3: Tag connector
•CN4: ST-LINK select jumper
•CN5: ST-LINK debug connector
•CN6: reserved U.FL connector
•CN7: INT pins of sensors
•CN8: USB connector for DEVICE
•CN9: USB connector for ST_LINK
•CN10: USB connector for UART
•CN11: USB connector for power
•CN12: 25*2 pins connector for MCU
•CN13: 25*2 pins connector for Modem
•CN14: 3.5mm stereo headphone connector
•P1: Socket 10X2 STMod+
In addition, one jumper JP1 is used for IDD measurements.
8.1 SMA connector for antenna
CN1 is a female SMA connector compatible with male SMA rod antenna.
On the TYPE-1SE module, U.FL connector is the only way to connect extern antenna. The
TYPE-1SE module can use the SMA rod antenna through the CN1 cable which convert the
SMA port to U.FL port. Users can connect rod antenna on the SMA connector as it has better
performance.
8.2 SIM card slot
CN2 is a micro-SIM card slot.
SIM card slot only support Micro-SIM card and it supports card detect function which can
detect the existence of the SIM card. When the SIM-card exists, the CD signal pin will be
floating. Otherwise, the signal pin will be pulled down. As R8 is soldered, floating state is
replaced by pull-up state.

Table 4 SIM card slot
Connector
Pin number
Pin name
Signal name
Function
CN2
1
CD
SIM_DETECT
Card exist
detect
2
GND
-
Power
3
GND
-
Power
4
GND
-
Power
5
GND
-
Power
C1
VCC
VDD_SIM
Power
C2
RST
SIM_RST
SIM RST
C3
CLK
SIM_CLK
SIM clock
C5
GND
-
Power
C6
VPP
VDD_SIM
Power
C7
I/O
SIM_DATA
SIM data
8.3 Tag connector
CN3 is a tag connector which provides direct debug port for the MCU.
The TAG connector is implemented on the B-L462E-CELL1 Discovery kit for IoT node. The
TAG connector is a 10-pin footprint supporting SWD mode, which is shared with the same
signals as for the ST-LINK.
The TC2050-IDC-NL cable is used to link ST-LINK and TAG connector on the B-L462E-
CELL1 Discovery kit for IoT node, so that the STM32L4 in the module can be easily
programmed and debugged without any extra accessory.
Figure 8. TAG connector Figure 9. TC2050-IDC-NL cable