STMicroelectronics STM32L476 User manual

June 2018 UM1879 Rev 4 1/41

UM1879

User manual

Discovery kit with STM32L476VG MCU

Introduction

The STM32L476 Discovery kit (32L476GDISCOVERY) helps the user to discover the

STM32L4 ultra-low-power features and to develop and share applications.

It is based on the STM32L476VGT6 microcontroller with three I2Cs, three SPIs, six

USARTs, CAN, SWPMI, two SAIs, 12-bit ADCs, 12-bit DAC, LCD driver, internal 128 Kbytes

of SRAM and 1 Mbyte of Flash memory, Quad-SPI, touch sensing, USB OTG FS, LCD

controller, FMC, JTAG debugging support.

The 32L476GDISCOVERY includes an ST-LINK/V2-1 embedded debugging tool interface,

LCD (24 segments, 4 commons), LEDs, push-button, joystick, USB OTG FS, audio DAC,

MEMS (microphone, 3-axis gyroscope, 6-axis compass), Quad-SPI Flash memory,

embedded ammeter measuring STM32 consumption in low-power mode.

External boards can be connected through the extension and probing connectors.

Figure 1. STM32L476 Discovery board

Picture is not contractual.

www.st.com

Contents UM1879

2/41 UM1879 Rev 4

Contents

1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2 Product marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3 System requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

4 Development toolchains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

5 Demonstration software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

6 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

7 Delivery recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

8 Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

9 Bootloader limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

10 Hardware layout and configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

10.1 Embedded ST-LINK/V2-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

10.1.1 Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

10.1.2 ST-LINK/V2-1 firmware upgrade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

10.1.3 Using ST-LINK/V2-1 to program/debug the STM32L476VGT6

on board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

10.1.4 Using ST-LINK/V2-1 to program/debug an external STM32 application

board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

10.2 Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

10.3 Clock source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

10.4 Reset source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

10.5 User interface: LCD, joystick, LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

10.6 Boot0 configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

10.7 Quad-SPI NOR Flash memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

10.8 USB OTG FS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

10.9 USART configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

10.10 Audio DAC and MEMS microphone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

UM1879 Rev 4 3/41

UM1879 Contents

10.11 9-axis motion sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

10.12 I2C extension connector CN2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

10.13 MCU current ammeter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

10.14 Extension connector P1 and P2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

10.15 Solder bridges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

11 Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Appendix A Power consumption measurements . . . . . . . . . . . . . . . . . . . . . . . . 35

Appendix B Mechanical drawing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Appendix C Compliance statements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

C.1 FCC Compliance Statement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

C.1.1 Part 15.19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

C.1.2 Part 15.105 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

C.1.3 Part 15.21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

C.2 IC Compliance Statement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

C.2.1 Compliance Statement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

C.2.2 Déclaration de conformité. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

List of tables UM1879

4/41 UM1879 Rev 4

List of tables

Table 1. Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Table 2. ON/OFF conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Table 3. Jumper states . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Table 4. Debug connector CN4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Table 5. Reset related jumper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Table 6. Connector CN2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Table 7. Extension connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Table 8. Solder bridges. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Table 9. Typical power consumption of the STM32L476 Discovery board. . . . . . . . . . . . . . . . . . . . 36

Table 10. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

UM1879 Rev 4 5/41

UM1879 List of figures

List of figures

Figure 1. STM32L476 Discovery board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Figure 2. Hardware block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Figure 3. STM32L476 Discovery board top layout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Figure 4. STM32L476 Discovery board bottom layout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Figure 5. Updating the list of drivers in device manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 6. CN1, CN3 (ON), CN4 connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 7. CN1, CN3 (OFF), CN4 connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Figure 8. Board jumper location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Figure 9. Connector CN2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Figure 10. STM32L476 Discovery board design top sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Figure 11. ST-LINK/V2-1 with support of SWD only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Figure 12. STM32L476VGT6 MCU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Figure 13. IDD measurement / MFX (Multi Function eXpander) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Figure 14. Joystick ACP, LEDs and push-button. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Figure 15. LCD display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Figure 16. OTG USB FS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Figure 17. Audio DAC and microphone MEMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Figure 18. Quad-SPI Flash memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Figure 19. Gyroscope, accelerometer, magnetometer MEMS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Figure 20. Power consumption tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Figure 21. STM32L476 Discovery board mechanical drawing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Features UM1879

6/41 UM1879 Rev 4

1 Features

•STM32L476VGT6 microcontroller featuring 1 Mbyte of Flash memory and 128 Kbytes

of RAM in LQFP100 package

•On-board ST-LINK/V2-1 supporting USB reenumeration capability

•Three different interfaces supported on USB:

– Virtual Com Port

– Mass storage

– Debug port

•Arm®Mbed enabled™(a) (see http: //mbed.org)

•LCD 24 segments, 4 commons in DIP 28 package

•Seven LEDs:

– LD1 (red/green) for ST-LINK/V2-1 USB communication

– LD2 (red) for 3.3 V power on

– LD3 overcurrent (red)

– LD4 (red), LD5 (green) two user LEDs

– LD6 (green), LD7 (red) USB OTG FS LEDs

•Push-button (reset)

•Four-direction joystick with selection

•USB OTG FS with Micro-AB connector

•SAI Audio DAC, stereo with output jack

•Digital microphone MEMS

•Accelerometer and magnetometer MEMS

•Gyroscope MEMS

•128-Mbit Quad-SPI Flash memory

•STM32 current ammeter with 4 ranges and auto calibration

•I2C extension connector for external board

•Four power supply options:

–ST-LINK/V2-1

– USB FS connector

– External 5V

– CR2032 battery (not provided)

•Extension connectors

•Comprehensive free software including a variety of examples, part of STM32Cube™

package

a. Arm and Mbed are registered trademarks or trademarks of Arm Limited (or its subsidiaries) in the US and/or

elsewhere.

UM1879 Rev 4 7/41

UM1879 Product marking

2 Product marking

Evaluation tools marked as “ES” or “E” are not yet qualified and are therefore not ready to

be used as reference design or in production. Any consequences arising from such usage

will not be at STMicroelectronics’ charge. In no event will STMicroelectronics be liable for

any customer usage of these engineering sample tools as reference designs 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 information in the STM32 datasheet at www.st.com).

•next to the evaluation tool ordering part number, that is stuck or silkscreen printed on

the board

This board features a specific STM32 device version, which allows the operation of any

bundled commercial stack/library available. This STM32 device shows a "U" marking option

at the end of the standard part number and is not available for sales.

In order to use the same commercial stack in his application, a developer may need to

purchase a part number specific to this stack/library. The price of those part numbers

includes the stack/library royalties.

3 System requirements

•Windows®OS (7, 8 and 10), Linux®64-bit or macOS®(a)

•USB Type-A to Micro-B cable

4 Development toolchains

•Keil®MDK-ARM(b)

•IAR™ EWARM(b)

•GCC-based IDEs including free SW4STM32 from AC6

•Arm®Mbed™ online (see http://mbed.org)

a. macOS® is a trademark of Apple Inc., registered in the U.S. and other countries.

b. On Windows only

Demonstration software UM1879

8/41 UM1879 Rev 4

5 Demonstration software

The demonstration software, included in the STM32Cube MCU Package corresponding to

the on-board MCU, 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/stm32l4-

discovery web page.

6 Ordering information

To order the 32L476GDISCOVERY Discovery kit, refer to Table 1.

7 Delivery recommendations

Some verifications are needed before using the board for the first time to make sure that

nothing has been damaged during the shipment and that no components are unplugged or

lost. When the board is extracted from its plastic bag, check that no component remains in

the bag. In particularly, make sure that the following jumpers on top side of the board are

plugged: CN3, JP3, JP5, and JP6.

The battery CR2032 is not provided.

8 Conventions

Table 2 provides conventions used in the present document.

Table 1. Ordering information

Order code Target STM32

32L476GDISCOVERY STM32L476VGT6

Table 2. ON/OFF conventions

Convention Definition

Jumper JPx ON Jumper fitted

Jumper JPx OFF Jumper not fitted

Solder bridge SBx ON SBx connections closed by solder

Solder bridge SBx OFF SBx connections left opened

UM1879 Rev 4 9/41

UM1879 Bootloader limitations

9 Bootloader limitations

Boot from system Flash memory results in executing bootloader code stored in the system

Flash memory protected against writing and erasing. This allows in-system programming

(ISP), that is, flashing the STM32 user Flash memory. It also allows writing data into RAM.

The data come in via one of communication interfaces such as USART, SPI, I2C bus, USB

or CAN.

Bootloader version can be identified by reading the Bootloader ID at the address

0x1FFF6FFE.

The STM32L476VGT6 part soldered on the 32L476GDISCOVERY main board is marked

with a date code corresponding to its date of manufacturing. STM32L476VGT6 parts with

the date code prior or equal to week 22 of 2015 are fitted with bootloader V 9.0 affected by

the limitations to be worked around, as described hereunder. Parts with the date code

starting from week 23 of 2015 contain bootloader V 9.2 in which the limitations no longer

exist.

To locate the visual date code information on the STM32L476VGT6 package, refer to its

datasheet (DS10198) available at www.st.com, section Package Information. Date code

related portion of the package marking takes Y WW format, where Y is the last digit of the

year and WW is the week. For example, a part manufactured in week 23 of 2015 bares the

date code 5 23.

Bootloader ID of the bootloader V 9.0 is 0x90.

The following limitations exist in the bootloader V 9.0:

1. RAM data get corrupted when written via USART/SPI/I2C/USB interface

Description:

Data write operation into RAM space via USART, SPI, I2C bus or USB results in wrong

or no data written.

Workaround:

To correct the issue of wrong write into RAM, download the STSW-STM32158

bootloader V 9.0 patch package from the www.st.com website and load "Bootloader

V9.0 SRAM patch" to the MCU, following the information in readme.txt file available in

the package.

2. User Flash memory data get corrupted when written via CAN interface

Description:

Data write operation into user Flash memory space via CAN interface results in wrong

or no data written.

Workaround:

To correct the issue of wrong write into Flash memory, download the STSW-STM32158

bootloader V 0.9 patch package from the www.st.com website and load "Bootloader V9.0

CAN patch" to the MCU, following the information in readme.txt file available in the package.

Hardware layout and configuration UM1879

10/41 UM1879 Rev 4

10 Hardware layout and configuration

The STM32L476 Discovery board is designed around the STM32L476VGT6 (100-pin LQFP

package). The hardware block diagram (see Figure 2) illustrates the connection between

the STM32L476VGT6 and the peripherals (9-axis motion sensors, digital microphone

MEMS, LCD segment, 128 Mbytes of Quad-SPI Flash memory, SAI Audio DAC stereo with

3.5mm output jack, USB OTG FS, IDD current measurement, LEDs, push-button, joystick)

and the Figure 3 will help to locate these features on the STM32L476 Discovery board.

Figure 2. Hardware block diagram

A to Mini-B

USB

Embedded

ST_LINK/V2-1

(3V CR2032 Battery)

CR1

SWDHeader P1

Header P2

STM32L476VGT6

power

JP6

IO reset

9-axis motion

sensors

digital

microphone

MEMS

SAI Audio DAC

stereo

LCD segment

(4x24)

128Mb

QuadSPI flash

USB OTG FS with

Micro-A-B

connector

IDD current

measurement

Reset

pushbutton

Joystick with

4-direction

control and

selector

User LEDs

LD5 (green)

LD4 (red)

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