ST STM32L4 Series User manual

March 2018 UM2153 Rev 4 1/57
1
UM2153
User manual
Discovery kit for IoT node, multi-channel communication
with STM32L4
Introduction
The STM32L4 Discovery kit for the IoT node (B-L475E-IOT01A) allows users to develop
applications with direct connection to cloud servers.
The STM32L4 Discovery kit enables a wide diversity of applications by exploiting low-power
multilink communication (BLE, Sub-GHz), 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 STM32L4 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-L475E-IOT01A Discovery kit
1. Picture is not contractual.
www.st.com

Contents UM2153
2/57 UM2153 Rev 4
Contents
1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2 Product marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3 System requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4 Development toolchains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5 Demonstration software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
6 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
7 Hardware layout and configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
7.1 STM32L4 Discovery kit for IoT node layout . . . . . . . . . . . . . . . . . . . . . . . 10
7.2 STM32L4 Discovery kit for IoT node mechanical drawing . . . . . . . . . . . . 12
7.3 Embedded ST-LINK/V2-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
7.3.1 Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
7.3.2 ST-LINK/V2-1 firmware upgrade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7.4 Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7.5 Programming/debugging when the power supply is not from
ST-LINK (5V_ST_LINK) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
7.6 Clock sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
7.7 Reset sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
7.8 USB OTG FS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
7.9 Quad-SPI NOR Flash memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7.10 Virtual COM port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7.11 RF modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7.11.1 Bluetooth (V4.1 compliant) SPBTLE-RF module . . . . . . . . . . . . . . . . . . 20
7.11.2 Sub-GHz low-power-programmable RF module
(SPSGRF-868 or SPSGRF-915) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
7.11.3 Wi-Fi module Inventek ISM43362-M3G-L44 (802.11 b/g/n) . . . . . . . . . 22
7.11.4 Dynamic NFC Tag based on M24SR with its printed NFC antenna . . . . 23
7.12 STMicroelectronics sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
7.12.1 Two on-board ST-MEMS microphones (MP34DT01) . . . . . . . . . . . . . . 24

UM2153 Rev 4 3/57
UM2153 Contents
3
7.12.2 Capacitive digital sensor for relative humidity and
temperature (HTS221) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
7.12.3 High-performance 3-axis magnetometer (LIS3MDL) . . . . . . . . . . . . . . . 25
7.12.4 3D accelerometer and 3D gyroscope (LSM6DSL) . . . . . . . . . . . . . . . . 26
7.12.5 260-1260 hPa absolute digital output barometer (LPS22HB) . . . . . . . . 26
7.12.6 Time-of-Flight and gesture detection sensor (VL53L0X) . . . . . . . . . . . . 27
7.13 STSAFE-A 100 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
7.14 Buttons and LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
7.15 I2C addresses of modules used on MB1297 . . . . . . . . . . . . . . . . . . . . . . 29
8 Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
8.1 Arduino Uno V3 connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
8.2 TAG connector CN5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
8.3 ST-LINK/V2-1 USB Micro-B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
8.4 ST-LINK debug connector CN8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
8.5 USB OTG FS micro-AB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
8.6 PMOD connector CN10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
8.7 Jumper JP5 for IDD measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Appendix A STM32L4 Discovery kit for IoT node I/O assignment . . . . . . . . . . . 37
Appendix B Schematics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Appendix C Board revision history and limitations . . . . . . . . . . . . . . . . . . . . . . 53
Appendix D Federal Communications Commission (FCC)
and Industry Canada (IC) Compliance . . . . . . . . . . . . . . . . . . . . . . . 54
D.1 FCC Compliance Statement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
D.1.1 Part 15.19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
D.1.2 Part 15.105 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
8.7.1 Part 15.21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
8.8 IC Compliance Statement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
8.8.1 Compliance Statement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
8.8.2 Déclaration de conformité . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
8.8.3 RF exposure statement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

List of tables UM2153
4/57 UM2153 Rev 4
List of tables
Table 1. Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 2. Button and LED control port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Table 3. I2C addresses for each module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Table 4. Arduino connector pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Table 5. TAG connector pinout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Table 6. USB Micro-B connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Table 7. ST-LINK debug connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Table 8. USB OTG FS Micro-AB pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Table 9. USB OTG FS power management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Table 10. PMOD solder bridge configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Table 11. STM32L4 Discovery kit for IoT node I/O assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Table 12. Board revision history and limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Table 13. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

UM2153 Rev 4 5/57
UM2153 List of figures
5
List of figures
Figure 1. B-L475E-IOT01A Discovery kit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Figure 2. Hardware block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 3. STM32L4 Discovery kit for IoT node (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 4. STM32L4 Discovery kit for IoT node (bottom view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 5. STM32L4 Discovery kit for IoT node mechanical drawing . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 6. USB composite device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 7. JP4: 5V_ST_LINK selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 8. JP4: 5V_ARD selection from CN6 (VIN). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 9. JP4: 5V_USB_FS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 10. JP4: 5V_VBAT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 11. JP4: 5V_USB_CHARGER selection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 12. Power tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 13. SPBTLE-RF module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 14. SPSGRF module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 15. ISM43362-M3G-L44 module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 16. Label for Class 1 laser products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 17. Arduino connector (front view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Figure 18. TAG connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Figure 19. TC2050-IDC-NL cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Figure 20. USB Micro-B connector CN7 (front view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Figure 21. USB OTG FS Micro-AB connector CN9 (front view). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Figure 22. STM32L4 Discovery kit for IoT node (top) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Figure 23. STM32L475VG microcontroller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Figure 24. STM32L475VG microcontroller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Figure 25. USB OTG FS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Figure 26. RF module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Figure 27. ST-MEMS sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Figure 28. NFC and STSAFE part . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Figure 29. Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Figure 30. Arduino Uno V3 connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Figure 31. Peripherals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Figure 32. ST-LINK/V2-1 with support of SWD only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Features UM2153
6/57 UM2153 Rev 4
1 Features
•Ultra-low-power STM32L4 Series MCUs based on Arm®Cortex®-M4 core with 1 Mbyte
of Flash memory and 128 Kbytes of SRAM, in LQFP100 package
•64-Mbit Quad-SPI (Macronix) Flash memory
•Bluetooth®V4.1 module (SPBTLE-RF)
•Sub-GHz (868 or 915 MHz) low-power-programmable RF module
(SPSGRF-868 or SPSGRF-915)
•Wi-Fi®module Inventek ISM43362-M3G-L44 (802.11 b/g/n compliant)
•Dynamic NFC tag based on M24SR with its printed NFC antenna
•2 digital omnidirectional microphones (MP34DT01)
•Capacitive digital sensor for relative humidity and temperature (HTS221)
•High-performance 3-axis magnetometer (LIS3MDL)
•3D accelerometer and 3D gyroscope (LSM6DSL)
•260-1260 hPa absolute digital output barometer (LPS22HB)
•Time-of-Flight and gesture-detection sensor (VL53L0X)
•2 push-buttons (user and reset)
•USB OTG FS with Micro-AB connector
•Board expansion connectors:
– Arduino™ Uno V3
–PMOD
•Flexible power-supply options: ST-LINK USB VBUS 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 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)

UM2153 Rev 4 7/57
UM2153 Product marking
56
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 (XP, 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 www.st.com/stm32app-discovery webpage.
a. On Windows®only.

Ordering information UM2153
8/57 UM2153 Rev 4
6 Ordering information
To order the B-L475E-IOT01A Discovery kit for IoT node, depending on the frequency of the
Sub-GHz module, refer to Table 1.
Table 1. Ordering information
Order code Sub-GHz operating frequency
B-L475E-IOT01A1 915 MHz
B-L475E-IOT01A2 868 MHz

UM2153 Rev 4 9/57
UM2153 Hardware layout and configuration
56
7 Hardware layout and configuration
The STM32L4 Discovery kit for IoT node is designed around the STM32L475VGT6 (100-
pin, LQFP package). The hardware block diagram (see 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 four RF modules (Wi-Fi, Bluetooth, Sub-GHz and NFC)).
Figure 4 and Figure 5 help users to locate these features on the STM32L4 Discovery kit.
Figure 2. Hardware block diagram
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Hardware layout and configuration UM2153 10/57 UM2153 Rev 4
7.1 STM32L4 Discovery kit for IoT node layout
Figure 3. STM32L4 Discovery kit for IoT node (top view)