ST UM2708 User manual

Introduction

The B-L4S5I-IOT01A Discovery kit for the IoT node allows the user to develop applications with a direct connection to the cloud

servers.

The B-L4S5I-IOT01A Discovery kit for the IoT node enables a wide diversity of applications by exploiting low-power

multilink communication (Bluetooth® Low Energy, Wi‑Fi®, NFC), multiway sensing (detection, environmental awareness) and

Arm® Cortex®-M4 core-based STM32L4+ Series features.

ARDUINO® Uno V3 and Pmod™ connectivity provide unlimited expansion capabilities with a large choice of specialized add-on

boards.

The B-L4S5I-IOT01A Discovery kit for the IoT node includes an ST-LINK debugger/programmer and comes with the

comprehensive STM32CubeL4 MCU Package, which provides an STM32 comprehensive software HAL library as well as

various software examples to seamlessly connect to cloud servers.

Figure 1. B-L4S5I-IOT01A Discovery kit for the IoT node

Picture is not contractual.

Discovery kit for IoT node, multi-channel communication with STM32L4+ Series

UM2708

User manual

UM2708 - Rev 2 - December 2021

For further information contact your local STMicroelectronics sales office. www.st.com

1Features

• Ultra-low-power STM32L4+ Series STM32L4S5VIT6 microcontroller based on the Arm® Cortex®-M4 core

with 2 Mbytes of Flash memory and 640 Kbytes of RAM in LQFP100 package

• 64-Mbit Quad-SPI Flash memory from Macronix™

• Bluetooth® 4.1 module (SPBTLE-RF) from STMicroelectronics

• 802.11 b/g/n compliant Wi‑Fi® module (ISM43362-M3G-L44) from Inventek Systems

• Dynamic NFC TAG based on ST25DV04K with its printed NFC antenna

• 2 digital omnidirectional microphones ((I)MP34DT0x) from STMicroelectronics

• Capacitive digital sensor for relative humidity and temperature (HTS221) from STMicroelectronics

• High-performance 3-axis magnetometer (LIS3MDL) from STMicroelectronics

• 3D accelerometer and 3D gyroscope (LSM6DSL) from STMicroelectronics

• 260-1260 hPa absolute digital output barometer (LPS22HB) from STMicroelectronics

• Time-of-flight and gesture-detection sensor (VL53L0X) from STMicroelectronics

• Highly-secure solution (STSAFE-A110) from STMicroelectronics

• 2 push-buttons (user and reset)

• USB OTG FS with Micro-AB connector

•ARDUINO® Uno V3 expansion connector

• Pmod™ expansion connector

• Flexible power-supply options: ST-LINK USB VBUS, USB connector, or external sources

• On-board ST-LINK/V2-1 debugger/programmer with USB re-enumeration capability: mass storage, Virtual

COM port, and debug port

• Comprehensive free software libraries and examples available with the STM32Cube 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.

UM2708

Features

UM2708 - Rev 2 page 2/41

2Ordering information

To order the B-L4S5I-IOT01A Discovery kit for the IoT node, 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 reference Target STM32

B-L4S5I-IOT01A MB1297 STM32L4S5VIT6

2.1 Codification

The meaning of the codification is explained in Table 2.

Table 2. Codification explanation

B-L4S5I-IOT01A Description B-L4S5I-IOT01A

B Discovery kit with a variety of sensors Sensor node

L4S5 MCU product line in STM32 32-bit Arm Cortex MCUs STM32L4R5/S5 in the STM32L4+ Series

ISTM32 Flash memory size:

• I for 2 Mbytes 2 Mbytes

IOT Dedicated to IoT applications Discovery kit for IoT applications

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Ordering information

UM2708 - Rev 2 page 3/41

3Development environment

The B-L4S5I-IOT01A Discovery kit for the IoT node runs with the STM32L4S5VI 32-bit microcontroller based on

the Arm® Cortex®-M4 core.

3.1 System requirements

• Multi‑OS support: Windows® 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

UM2708 - Rev 2 page 4/41

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

UM2708

Conventions

UM2708 - Rev 2 page 5/41

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

UM2708 - Rev 2 page 6/41

6Hardware layout and configuration

The B-L4S5I-IOT01A Discovery kit for the IoT node is designed around the STM32L4S5VIT6 target

microcontroller in a 100-pin LQFP package. The hardware block diagram (Refer to Figure 2) illustrates the

connection between the STM32 and peripherals: embedded ST-LINK, ARDUINO® Uno V3 shields, Pmod™

connector, Quad-SPI Flash memory, USB OTG connectors, digital microphones, various ST-MEMS sensors,

and the three RF modules (Wi‑Fi®, Bluetooth®, and NFC). Figure 3 and Figure 4 help users to locate these

features on the B-L4S5I-IOT01A Discovery kit for the IoT node. Figure 5 gives the mechanical dimensions of the

B-L4S5I-IOT01A Discovery kit for the IoT node.

Figure 2. Hardware block diagram

STM32L4S5VIT6

(I)MP34DT0x digital microphone

RTC

SWD

3.3 V Power

supply

32 KHz Crystal

ST-LINK /

V2-1

GPIOs and

UART3

DFSDM

ISM43362-M3G-L44

Wi-Fi® module

PmodTM (2A) connector

PmodTM (4A) connector

LEDs,

reset and wake-up

buttons

GPIOs

GPIOs and

SPI2

GPIOs and

UART2

HS PHY and

Micro-AB USB

connector

OTG FS

QSPI

64-Mbit Quad-SPI Flash

(MX25R6435F)

VCP UART1

ARDUINO® UNo

Shield connectors

GPIOs,

UART4,

and SPI1

Micro-B

USB

connector

GPIOs and

SPI3

SPBTLE-RF

Bluetooth® module

SPSGRF Sub-GHz

(Spirit) module

Not fitted

ST25DV04K NFC

module

GPIOs and

I2C2

LIS3MDL

3-axis magnetometer

LSM6DSL

3D gyroscope

LPS22HB

digital barometer

HTS221

humidity and temperature

VL53L0X

ToF and gesture

detection

STSAFE-A110

authentication and

security

(I)MP34DT0x digital microphone

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Hardware layout and configuration

UM2708 - Rev 2 page 7/41

Figure 3. B-L4S5I-IOT01A Discovery kit for the IoT node layout (top view)

UM2708 - Rev 2 page 8/41

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Figure 4. B-L4S5I-IOT01A Discovery kit for the IoT node layout (bottom view)

UM2708 - Rev 2 page 9/41

UM2708

Figure 5. B-L4S5I-IOT01A Discovery kit for the IoT node mechanical drawing in millimeters

UM2708 - Rev 2 page 10/41

UM2708

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