Discovery kit with STM32L476VG MCU - RS Components · 2019-10-12 · Discovery kit with STM32L476VG...
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August 2015 DocID027676 Rev 2 1/39 1 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 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, pushbutton, joystick, USB OTG FS, audio DAC, MEMS (Microphone, 3 axis gyroscope, 6 axis compass), Quad-SPI Flash memory, embedded ammeter measuring MCU consumption in low-power modes. External boards can be connected thanks to extension and probing connectors. Figure 1. STM32L476 discovery board 1. Picture not contractual. www.st.com
Transcript of Discovery kit with STM32L476VG MCU - RS Components · 2019-10-12 · Discovery kit with STM32L476VG...
August 2015 DocID027676 Rev 2 1/39
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UM1879User 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 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, pushbutton, joystick, USB OTG FS, audio DAC, MEMS (Microphone, 3 axis gyroscope, 6 axis compass), Quad-SPI Flash memory, embedded ammeter measuring MCU consumption in low-power modes.
External boards can be connected thanks to extension and probing connectors.
Figure 1. STM32L476 discovery board
1. Picture not contractual.
www.st.com
Contents UM1879
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Contents
1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2 Demonstration software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3 Order code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4 Delivery recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5 Bootloader limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6 Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
7 Hardware layout and configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
7.1 Embedded ST-LINK/V2-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
7.1.1 Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
7.1.2 ST-LINK/V2-1 firmware upgrade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7.1.3 Using ST-LINK/V2-1 to program/debug the STM32L476VGT6 on board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7.1.4 Using ST-LINK/V2-1 to program/debug an external STM32 applicationboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
7.2 Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
7.3 Clock source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
7.4 Reset source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
7.5 User interface: LCD, joystick, LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
7.6 Boot0 configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
7.7 Quad-SPI NOR Flash memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
7.8 USB OTG FS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
7.9 USART configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7.10 Audio DAC and MEMS microphone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7.11 9-axis motion sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7.12 I2C extension connector CN2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7.13 MCU current ammeter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
7.14 Extension connector P1, P2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
7.15 Solder bridges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
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8 Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Appendix A Power consumption measurements . . . . . . . . . . . . . . . . . . . . . . . . 35
Appendix B Mechanical drawing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
List of tables UM1879
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List of tables
Table 1. ON/OFF conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Table 2. Jumper states . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13Table 3. Debug connector CN4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15Table 4. Reset related jumper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18Table 5. Connector CN2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21Table 6. Extension connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22Table 7. Solder bridges. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23Table 8. Typical power consumption of the STM32L476 discovery board . . . . . . . . . . . . . . . . . . . . 36Table 9. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
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List of figures
Figure 1. STM32L476 discovery board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1Figure 2. Hardware block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Figure 3. STM32L476 discovery board top layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11Figure 4. STM32L476 discovery board bottom layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Figure 5. Updating the list of drivers in device manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14Figure 6. CN1, CN3 (ON), CN4 connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14Figure 7. CN1, CN3 (OFF), CN4 connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15Figure 8. Board jumper location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17Figure 9. Connector CN2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Figure 10. STM32L476 discovery board design top sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25Figure 11. ST-LINK/V2-1 with support of SWD only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26Figure 12. STM32L476VGT6 MCU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27Figure 13. IDD measurement / MFX (Multi Function eXpander) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28Figure 14. Joystick ACP, LEDs and pushbutton . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29Figure 15. LCD display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30Figure 16. OTG USB FS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31Figure 17. Audio DAC and microphone MEMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32Figure 18. Quad-SPI Flash memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33Figure 19. Gyroscope, accelerometer, magnetometer MEMS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34Figure 20. Power consumption tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35Figure 21. STM32L476 discovery board mechanical drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Features UM1879
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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 re-enumeration capability
Three different interfaces supported on USB:
– Virtual com port
– Mass storage
– Debug port
Mbed-enabled (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 over current (red)
– LD4 (red), LD5 (green) two user LEDs
– LD6 (green), LD7 (red) USB OTG FS LEDs
Pushbutton (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
MCU 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
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2 Demonstration software
The demonstration software is preloaded in the STM32L476VGT6 Flash memory for an easy demonstration of the device peripherals in stand-alone mode. The latest versions of the demonstration source code and associated documentation can be downloaded from www.st.com/stm32l4-discovery.
3 Order code
To order the discovery kit based on the STM32L476VG MCU, use the order code: STM32L476G-DISCO.
4 Delivery recommendations
Some verifications are needed before using the board for the first time to make sure that nothing was damaged during the shipment and that no components are unplugged or lost. When the board is extracted from its plastic bag, please check that no component remains in the bag. In particularly, please 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.
Bootloader limitations UM1879
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5 Bootloader limitations
Boot from system Flash memory results in executing bootloader code stored in the system Flash memory protected against write and erase. This allows in-system programming (ISP), that is, flashing the MCU 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 Bootloader ID at the address 0x1FFF6FFE.
The STM32L476VGT6 part soldered on the 32L476GDISCOVERYmain board is marked with a date code corresponding to its date of manufacture. 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 on 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 STSW-STM32158 bootloader V 9.0 patch package from www.st.com 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 STSW-STM32158 bootloader V 0.9 patch package from www.st.com and load "Bootloader V9.0 CAN patch" to the MCU, following the information in readme.txt file available in the package
6 Conventions
Table 1 provides conventions used in the present document.
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Table 1. 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
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7 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 STM32L476VGT6 and 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, pushbutton, joystick) and 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
SWD
Head
er P
1
Head
er P
2 STM32L476VGT6
power
JP6
IO
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)
IO
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Figure 3. STM32L476 discovery board top layout
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Figure 4. STM32L476 discovery board bottom layout
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7.1 Embedded ST-LINK/V2-1
The ST-LINK/V2-1 programming and debugging tool is integrated on the STM32L476 discovery board. Compared to ST-LINK/V2 the changes are listed below.The new features supported on 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 100mA power on USB
These features are no more supported on 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 please refer to ST-LINK/V2 user manual (UM1075).There are two different ways to use the embedded ST-LINK/V2-1 depending on the jumper states: Program/debug the STM32L476VGT6 on board (Section 7.1.3),
Program/debug an STM32 in an external application board using a cable connected to SWD connector CN4 (Section 7.1.4)
.
7.1.1 Drivers
The ST-LINK/V2-1 requires a dedicated USB driver, which can be found on www.st.com for Windows 7, 8 and XP.
In case the STM32L476 discovery board is connected to the PC before the driver is installed, some 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.
Table 2. Jumper states
Jumper state Description
Both CN3 jumpers ON ST-LINK/V2-1 functions enabled for on board programming (default)
Both CN3 jumpers OFFST-LINK/V2-1 functions enabled for external board through external CN4 connector (SWD supported)
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Figure 5. Updating the list of drivers in device manager
1. Prefer using the “USB Composite Device” handle for a full recovery.
7.1.2 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 life time of the ST-LINK/V2-1 product (for example a new functionality, bug fixes, support for new microcontroller families), it is recommended to visit www.st.com before starting to use the STM32L476 discovery board and periodically, in order to stay up-to-date with the latest firmware version.
7.1.3 Using ST-LINK/V2-1 to program/debug the STM32L476VGT6 on board
To program the STM32L476VGT6 on board, simply plug in the two jumpers on CN3, as shown in Figure 6 in red, and connect the STM32L476 discovery board to the PC through the Mini-B USB ST-LINK/V2-1 CN1 connector. Make sure the jumpers JP3, JP6.3V3, and JP5.ON are set.
Do not use the CN4 connector.
Figure 6. CN1, CN3 (ON), CN4 connections
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7.1.4 Using ST-LINK/V2-1 to program/debug an external STM32 applicationboard
To use the ST-LINK/V2-1 to program the STM32 on an external application board (out of the STM32L476VGT6 on board), remove the 2 jumpers from CN3 as shown in Figure 7 in red, and connect your board to the CN4 software debug connector according to Table 3.
Make sure the jumpers JP6.3V3, and JP5.OFF are set.
JP3, must be ON if you use CN4 pin 5 (NRST) in your external application board.
Figure 7. CN1, CN3 (OFF), CN4 connections
Table 3. Debug connector CN4
Pin CN4 Designation
1 Vapp VDD from application
2 SWLCK SWD clock
3 GND Ground
4 SWDIO SWD data input/output
5 NRST RESET of target MCU
6 SWO Reserved
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7.2 Power supply
The power supply is provided with four options:
– ST-LINK/V2-1: CN1
– CR2032 battery (not provided): CR1
– External 5V: 5V_I
– USB FS connector: USB USER CN7
ST-LINK/V2-1:
JP6 needs to be placed in position 3V3. JP3 is closed. JP5 is in position ON. CN3 jumpers are ON.
The STM32L476G discovery board can be powered from the ST-LINK USB connector CN1 (5V_USB_ST_LINK). Only the ST-LINK circuit has the power before the USB enumeration as the host PC only provides 100mA to the board at that time.
Then during the USB enumeration, the STM32L476 discovery board requires 300 mA of current to the Host PC. If the host is able to provide the required power, the STM32L476 is powered and the red LED LD2 is turned ON, thus the STM32L476 discovery board and its extension board can consume a maximum of 300 mA current, no more. If the host is not able to provide the required current, the STM32L476 and the extension board are not power supplied. As a consequence the red LED LD2 remains turned OFF. In such case it is mandatory to use an external power supply as explained in the next section.
Warning: If the maximum current consumption of the STM32L476 discovery and its extension board exceeds 300 mA, it is mandatory to power STM32L476 discovery using an external power supply connected to 5V_I.
Note: In case this board is powered by an USB charger or an USB battery connected on CN1, there is no USB enumeration, the led LD2 remains OFF and the STM32L476 is not powered. In this specific case only, please fit the jumper JP2 to allow the STM32L476 to be powered anyway. Remove this jumper JP2 if then a Host PC is connected to the ST-LINK/V2-1 CN1 connector to supply the board.
CR2032 battery inserted in CR1 (bottom side):
The CR2032 battery is not provided.
JP6 needs to be placed in position BATT. JP3 is opened. JP5 is in position ON.
The battery supplies the 3V3 and 3V power domains on board. All the peripherals are powered, except the ST-LINK which can only be supplied through the USB connector CN1.
External 5V_I or USB USER CN7 (USB FS connector):
– External 5V_I: The pin 3 5V_I of P2 header can be used as input for an external power supply. In this case, the STM32L476 discovery board must be powered by a power supply unit or by an auxiliary equipment complying with standard EN-60950-1: 2006+A11/2009, and must be Safety Extra Low Voltage (SELV) with a limited power capability.
– To use the USB USER CN7 to power supply the board, a jumper needs to be placed between VUSB pin4 and the pin 3 5V_I of P2 Header (Figure 8).
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Figure 8. Board jumper location
In this condition it is still possible to use the USB ST-LINK for communication, for programming or debugging, but it is mandatory to power supply the board first using 5V_I or USB USER CN7 then connect the USB ST-LINK cable to the PC. Proceeding this way ensures that the enumeration occurs thanks to the external power source.
The following power sequence procedure must be respected:
1. Connect the external power source to 5V_I or USB USER CN7.
2. Power on the external power supply 5V_I or USB USER CN7.
3. Check that LD2 is turned ON.
4. Connect the PC to USB ST-LINK connector CN1.
If this order is not respected, the board may be supplied by 5V_USB_ST_LINK first then by 5V_I or USB USER CN7 and the following risks may be encountered:
1. If more than 300 mA current is needed by the board, the PC may be damaged or the current supply can be limited by the PC. As a consequence the board is not powered correctly.
2. 300 mA is requested at enumeration (since JP2 must be OFF) so there is risk that the request is rejected and the enumeration does not succeed if the PC cannot provide such current. Consequently the board is not power supplied (LED LD2 remains OFF).
Note: The headers pins 5V (except in battery mode), 3V3, 2V5, 3V can be used as output power supply when an extension board is connected to the P1 and P2 headers. The power consumption of the extension board must be lower than 100 mA.
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7.3 Clock source
The STM32L476VGT6 MCU uses:
A 32.768 kHz low-speed source:
– By default, the X3 crystal on board
– From an external oscillator through P2 header (pin7 labeled ‘PC14’). The configuration needed is: SB19 opened, SB20 closed, R26 removed.
A system clock source:
– By default, generated by an internal STM32L476VGT6 oscillator.
The configuration needed is:
- SB18 opened, SB21 and SB22 closed.
– Or driven by an X2 Crystal on board (not fitted).
The configuration needed is:
- SB18, SB21 and SB22 opened.
- X2, R88, R89, C77, C78 fitted
– Or driven by a MCO signal (8MHz) from the ST-LINK MCU STM32F103CBT6 (U3).
The configuration needed is:
- SB18 closed, SB22 opened.
- R89 not fitted.
– Or driven externally from PH0 through the P2 header, pin9 labeled ‘PH0’
The configuration needed is:
- SB22 closed, SB18 opened.
- R89 not fitted.
Note: Please refer to oscillator design guide for STM32 microcontrollers (AN2867)
7.4 Reset source
The reset signal NRST of the STM32L476 discovery board is low active and the reset sources include: The reset button B1, connected by default to NRST (SB23 closed)
The embedded ST-LINK/V2-1
The external reset pin 11 of P2 header connector, labeled ‘NRST’
The external reset from SWD connector CN4, pin5
Table 4. Reset related jumper
Jumper Description
JP3
When JP3 is closed, the SWD connector CN4 pin5 and the embedded ST-LINK/V2-1 are connected to NRST.
Default Setting: closed
JP3 is opened, no connection between CN4 and ST-LINK/V2-1 to NRST. This must be used when the ST-LINK/V2-1 is not powered (i.e STM32L476 discovery board) is powered by the CR2032 battery
DocID027676 Rev 2 19/39
UM1879 Hardware layout and configuration
38
7.5 User interface: LCD, joystick, LEDs
The STM32L476 discovery board features 7 LEDs with the following functionalities:
LD1 COM: LD1 default status is red. LD1 turns to green to indicate that communications are in progress between the PC and the ST-LINK/V2-1.
LD2 PWR: the red LED indicates that the board is powered.
LD3 OC: the red LED indicates a fault when the board is in current limit (510 mA).
LD4 user: The red LED is a user LED connected to the I/O PB2 of the STM32L476VGT6.
LD5 user: The green LED is a user LED connected to the I/O PE8 of the STM32L476VGT6.
LD6, LD7: USB OTG FS LEDs, see Section 7.8
Four direction joystick (B2) with selection and a reset pushbutton (B1) are available as input devices.
A LCD 4x24 segments, 4 commons, multiplexed 1/4 duty, 1/3 bias is mounted on the DIP28 connector U5.
7.6 Boot0 configuration
Boot0 is by default grounded through a pull-down R91.
It is possible to set Boot0 high, removing R91 and putting a jumper between P1 header pin 6 BOOT0 and pin5 3V.
7.7 Quad-SPI NOR Flash memory
128-Mbit Quad-SPI NOR Flash memory is connected to Quad-SPI interface of STM32L476VGT6.
7.8 USB OTG FS
The STM32L476 discovery board supports USB OTG Full Speed communication via an USB Micro-AB connector (CN7) and USB power switch (U14) connected to VBUS. The board can be powered by this USB connection as described in Section 7.2.
A green LED LD6 will be lit in one of these cases:
The power switch (U14) is ON and STM32L476 discovery board works as a USB host
VBUS is powered by another USB host when STM32L476 discovery board works as an USB device.
Red LED LD7 will be lit when an over-current occurs.
In order to connect the OTG_FS_VBUS and OTG_FS_ID signals from the connector CN7 to the OTG FS hardware IP of STM32L476VGT6, please remove the LCD from its socket U5, and close SB24 and SB25.
The default configuration is that the LCD is connected to U5, and SB24 and SB25 are opened. In this case the OTG_FS_VBUS and OTG_FS_ID signals from CN7 are connected to the OTG FS peripheral of the STM32L476VGT6 available on PC11 and PC12.
Hardware layout and configuration UM1879
20/39 DocID027676 Rev 2
7.9 USART configuration
The USART interface available on PD5 and PD6 of the STM32L476VGT6 can be connected to ST-LINK MCU to use the Virtual Com Port function.
To use the Virtual Com Port function with:
The onboard STM32L476VGT6: set SB13 and SB16 ON. (SB15, SB17 must be OFF)
An external MCU: remove solder from SB13 and SB16, solder a 2 pins header on JP4, then you can connect RX and TX of the external MCU directly to RX and TX of JP4.
(For more details see Section 8: Schematics)
7.10 Audio DAC and MEMS microphone
An audio stereo DAC CS43L22 (U13) is connected to SAI interface of STM32L476VGT6.
The STM32L476VGT6 controls the audio DAC via the I2C1 bus which is shared with the I2C extension connector CN2.
I2C1 is also available on the connector P1, pins labeled ‘PB6’ (I2C1_SCL) and ‘PB7’ (I2C1_SDA).
The stereo output jack connector is CN6.
Note: I2C address of CS43L22 is 0x94.
A MEMS audio sensor omnidirectional digital microphone provides a digital signal in PDM format to the STM32L476VGT6.
7.11 9-axis motion sensors
STM32L476 discovery board supports some 9-axis motion sensors, composed of:
L3GD20 (U7): a three-axis digital output gyroscope,
LSM303C (U6): a 3D accelerometer and 3D magnetometer module,
which are connected to STM32L476VGT6 through SPI.
7.12 I2C extension connector CN2
Figure 9. Connector CN2
DocID027676 Rev 2 21/39
UM1879 Hardware layout and configuration
38
7.13 MCU current ammeter
The jumper JP5, labeled Idd, allows the consumption of STM32L476VGT6 to be measured directly by a built-in current ammeter circuit able to measure from 60nA to 50mA or by removing the jumper and connecting an ammeter
Jumper on position OFF: STM32L476VGT6 is powered (default).
Jumper on position ON: a module onboard is designed to measure from 60nA to 50mA by using several MOSFETs and switching automatically depending on the read value.
No jumper on JP5: an ammeter must be connected to measure the STM32L476VGT6 current through pin 1 and 2 (if there is no ammeter, the STM32L476VGT6 is not powered).
Table 5. Connector CN2
Pin number Description Pin number Description
1 I2C1_SDA (PB7) 5 +3V3
2 NC 6 NC
3 I2C1_SCL (PB6) 7 GND
4 EXT_RST(PD0) 8 NC
Hardware layout and configuration UM1879
22/39 DocID027676 Rev 2
7.14 Extension connector P1, P2
The P1 and P2 headers can connect the STM32L476 discovery board to a standard prototyping/wrapping board. STM32L476VGT6 GPIOs are available on these connectors.
P1 and P2 can also be probed by an oscilloscope, logical analyzer or voltmeter.
Table 6. Extension connector
P1 P2
Pin number function Pin number function
1 3V3 15V_U
(5V_USB_ST_LINK)
2 GND 2 GND
3 2V5 35V_I
(5V INPUT)
4 GND 4VUSB
(USB OTG FS VBUS)
5 3V 5 5V
6 BOOT0 6 GND
7 PB3 7 PC14
8 PB2 8 PC15
9 PE8 9 PH0
10 PA0 10 PH1
11 PA5 11 NRST
12 PA1 12 GND
13 PA2 13 PE11
14 PA3 14 PE10
15 PB6 15 PE12
16 PB7 16 PE13
17 PD0 17 PE14
18 NC 18 PE15
19 GND 19 GND
20 GND 20 GND
DocID027676 Rev 2 23/39
UM1879 Hardware layout and configuration
38
7.15 Solder bridges
Table 7 describes each solder bridge. The default state is indicated in bold.
Table 7. Solder bridges
Bridge State Description
SB1 (ST-LINK PWR)ON ST-LINK module is powered
OFF ST-LINK module is not powered
SB2 (EXT/RF E2P)ON 5V connected to CN2.8
OFF 5V is not connected to CN2.8
SB3, SB4, SB7, SB8 (RESERVED)
OFF Reserved, do not modify
SB5, SB6, SB9, SB10 (DEFAULT) ON Reserved, do not modify
SB11 (STM_RST)
ON No incidence on NRST signal of STM32F103CBT6
OFFNRST signal of STM32F103CBT6 is connected to GND
SB12 OFF Reserved
SB16, SB13 (USART RX, TX)
ONPA2, PA3 of STM32F103CBT6 are connected to PD6, PD5 of STM32L476VGT6
OFFPA2, PA3 of STM32F103CBT6 are not connected to PD6, PD5 of STM32L476VGT6
SB17, SB15 (MFX USART RX,TX)
ONPA10 of STM32F103CBT6 are not connected to PB3 of STM32L476VGT6
OFFPA2, PA3 of STM32F103CBT6 are connected to MFX USART RX,TX
SB14 (T_SWO)
ONPA10 of STM32F103CBT6 is connected to PB3 of STM32L476VGT6
OFFPA10 of STM32F103CBT6 is not connected to PB3 of STM32L476VGT6
SB18 (MCO)ON If SB22 is also ON, MCO is connected to PH0
OFF MCO is not connected to PH0
SB19, SB20 (32.768kHz CLK)ON PC14, PC15 are connected to X3 crystal
OFF PC14, PC15 are not connected to X3 crystal
SB21, SB22 (8MHz CLK)ON PH0, PH1 are connected to X2 crystal. (X2 is not fitted)
OFF PH0, PH1 are not connected to X2 crystal
SB23 (B1-RESET)
ONB1 pushbutton is connected to NRST of STM32L476 discovery board
OFFB1 pushbutton is not connected to NRST of STM32L476 discovery board
Hardware layout and configuration UM1879
24/39 DocID027676 Rev 2
SB24, SB25 (OTG FS)
ONOTG_FS_VBUS signal is connected to PA9
OTG_FS_ID signal is connected to PA10
OFFOTG_FS_VBUS signal is not connected to PA9
OTG_FS_ID signal is not connected to PA10
SB26 ON Reserved, do not modify
SB27 OFF Reserved, do not modify
SB28 (2.5V REG inhibit)ON U12 (2.5V regulator) input is inhibited
OFF U12 input is not inhibited
SB29 (2.5V REG input)ON 5V is connected to U12 input
OFF 5V is not connected to U12 input
Table 7. Solder bridges (continued)
Bridge State Description
DocID027676 Rev 2 25/39
UM1879 Schematics
38
8 Schematics
Figure 10. STM32L476 discovery board design top sheet
110
STM32L476 Discovery
MB1184
C-01
6/15/2015
Title:
Size:
Reference:
Date:
Sheet:
of
A4
Revision:
STM32L476G-D
ISCO
Project:
SWDIO
SWCL
K
MCO
NRS
T
NRS
T
MCO
LD_R
SWCL
KSW
DIO
USA
RT_T
XUSA
RT_R
X
LD_G
MFX
_IRQ
_OUT
MFX
_WAKEU
P
QSP
I_D0
QSP
I_D3
QSP
I_D2
QSP
I_D1
QSP
I_CLK
QSP
I_CS
SAI1_F
SSA
I1_S
DSA
I1_S
CK
I2C1_SC
LI2C1_SD
A
AUDIO_R
ST
SAI1_M
CK
AUDIO_D
INAUDIO_C
LK
OTG
_FS_
PowerSw
itchO
n
OTG
_FS_
DM
OTG
_FS_
DP
OTG
_FS_
IDOTG
_FS_
VBU
S
OTG
_FS_
OverCurrent
SEG[0..23]
COM[0..3]
EXT_
RST
PH[0..1]
JOY_C
ENTE
RJO
Y_D
OWN
JOY_L
EFT
JOY_R
IGHT
JOY_U
P
MEM
S_SC
K
MEM
S_MISO
MEM
S_MOSI
GYRO
_CS
GYRO
_INT1
GYRO
_INT2
XL_
CS
XL_
INT
MAG_C
SMAG_D
RDY
MAG_INT
MFX
_USA
RT3_RX
MFX
_USA
RT3_
TX
MFX
_I2C
_SDA
MFX
_I2C
_SCL
BOOT0
SWO
3V3_REG
-ON
PC14
PC15
U_S
TM32
LxST
M32Lx
.SchDoc
Rev A-01 -->
PCB
label M
B1184 A-01
Rev B-01 --> PC
B label M
B1184 B-01, Rem
ove R9
1, Replace COM4..7 by CO
M0..3,
Add SB for U
SB_O
TG, add VBU
S on P2 for U
SB USE
R pow
er su
pply
Rev C-01 --> PC
B label M
B1184 C-01, Rem
ove SW
CLK an
d SW
O sh
orted,
Re
placed on P1
, PB8
..9 by PB
6..7.
-->
MP4
5DT0
2 replaced by MP3
4DT0
1 -->
Xtal 32.768kHz replaced by NX3215SA
-->
Change values of C
27, C
25 : C27=C
25=4
.7pF
-->
Change values of resistors : R40=R
47=6
.04k, R
49=1
5k,
USA
RT_T
XUSA
RT_R
X
3V
GND
GND
NRS
T
PC14
PC15
PH1
PH0
BOOT0
5V_IN
5V
SWDIO
SWCL
K
MCO
NRS
T
USA
RT_R
XUSA
RT_T
X
MFX
_USA
RT3_RX
MFX
_USA
RT3_
TX
SWO
3V3_REG
-ON
U_S
T_LINK_V
2-1
ST_L
INK_V
2-1.SC
HDOC
MFX
_WAKEU
PMFX
_IRQ
_OUT
MFX
_I2C
_SDA
MFX
_I2C
_SCL
MFX
_USA
RT3_RX
MFX
_USA
RT3_
TXNRS
T
U_IDD_m
easurement
IDD_m
easurement.S
chDoc
MFX
_I2C
_SCL
MFX
_I2C
_SDA
MFX
_IRQ
_OUT
MFX
_WAKEU
P
MFX
_USA
RT3_RX
MFX
_USA
RT3_
TX
MFX
_USA
RT3_RX
MFX
_USA
RT3_
TX
3V3
AUDIO_C
LKAUDIO_D
INAUDIO_R
ST
SAI1_F
SSA
I1_S
DSA
I1_S
CK
I2C1_SC
LI2C1_SD
A
SAI1_M
CK
U_A
UDIO
AUDIO.SchDoc
OTG
_FS_
PowerSw
itchO
nOTG
_FS_
OverCurrent
OTG
_FS_
DM
OTG
_FS_
DP
OTG
_FS_
IDOTG
_FS_
VBU
S
U_U
SB_O
TG_F
SUSB
_OTG
_FS.SchD
oc
NRS
TLD
_RLD
_G
EXT_
RST
JOY_C
ENTE
RJO
Y_D
OWN
JOY_L
EFT
JOY_R
IGHT
JOY_U
P
I2C1_SC
LI2C1_SD
A
U_P
eripherals
Perip
herals.SchD
ocSE
G[0..23]
COM[0..3]
U_L
CD_G
H08172
LCD_G
H08172.SchD
oc
I2C1_SC
LI2C1_SD
A
SAI1_M
CK
SAI1_S
CKSA
I1_S
DSA
I1_F
S
AUDIO_R
STAUDIO_D
INAUDIO_C
LK
SEG[0..23]
COM[0..3]
OTG
_FS_
PowerSw
itchO
nOTG
_FS_
OverCurrent
OTG
_FS_
DM
OTG
_FS_
DP
OTG
_FS_
IDOTG
_FS_
VBU
S
NRS
TLD
_RLD
_G
EXT_
RST
JOY_C
ENTE
RJO
Y_D
OWN
JOY_L
EFT
JOY_R
IGHT
JOY_U
P
I2C1_SC
LI2C1_SD
A
PH[0..1]
QSP
I_D0
QSP
I_D3
QSP
I_D2
QSP
I_D1
QSP
I_CLK
QSP
I_CS
U_Q
SPI
QSP
I.SchDoc
QSP
I_D0
QSP
I_D1
QSP
I_D2
QSP
I_D3
QSP
I_CS
QSP
I_CLK
GYRO
_CS
MAG_C
S
MAG_INT
XL_
INT
MAG_D
RDY
MEM
S_SC
K
MEM
S_MISO
MEM
S_MOSI
GYRO
_INT1
GYRO
_INT2
XL_
CS
U_M
EMS
MEM
S.SchD
oc
GYRO
_INT1
GYRO
_INT2
MEM
S_SC
K
GYRO
_CS
MEM
S_MISO
MEM
S_MOSI
MAG_C
S
XL_
CS
MAG_D
RDY
XL_
INT
MAG_INT
NRS
T
SEG[0..23]
COM[0..3]
LD_R
LD_G
EXT_
RST
JOY_C
ENTE
RJO
Y_D
OWN
JOY_L
EFT
JOY_R
IGHT
JOY_U
P
I2C1_SC
LI2C1_SD
A
GYRO
_INT1
GYRO
_INT2
MEM
S_SC
K
GYRO
_CS
MEM
S_MISO
MEM
S_MOSI
MAG_C
S
XL_
CS
MAG_D
RDY
XL_
INT
MAG_INT
OTG
_FS_
PowerSw
itchO
nOTG
_FS_
OverCurrent
OTG
_FS_
DM
OTG
_FS_
DP
OTG
_FS_
IDOTG
_FS_
VBU
S
SWDIO
SWCL
K
MCO
NRS
T
QSP
I_D0
QSP
I_D1
QSP
I_D2
QSP
I_D3
QSP
I_CS
QSP
I_CLK
SAI1_M
CK
SAI1_S
CKSA
I1_S
DSA
I1_F
S
AUDIO_R
STAUDIO_D
INAUDIO_C
LK
USA
RT_T
XUSA
RT_R
X
BOOT0
MFX
_I2C
_SCL
MFX
_I2C
_SDA
MFX
_IRQ
_OUT
MFX
_WAKEU
P
MFX
_USA
RT3_RX
MFX
_USA
RT3_
TX3V
3_REG
-ON
SWO
SWO
3V3_REG
-ON
2V5
GND
GND
Wired on So
lder Side
JP8
JP7
5V_U
SB_S
T_LINK
GND
GND
GND
GND
GND
NC
3V3_REG
-ON
QSP
I_CLK
QSP
I_CS
QSP
I_D0
QSP
I_D1
QSP
I_D2
QSP
I_D3
JOY_C
ENTE
R
JOY_L
EFT
JOY_R
IGHT
JOY_U
P
JOY_D
OWN
LD_R
LD_G
EXT_
RST
I2C1_SC
LI2C1_SD
A
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
P1 Header 2
0
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
P2 Header 2
0
PB2
PE8
PA0
PA5
PA1
PA2
PA3
PB6
PB7
PD0
PE11
PB3
PE10
PE12
PE13
PE14
PE15
OTG
_FS_
VBU
S
PC14
PC15
Schematics UM1879
26/39 DocID027676 Rev 2
Figure 11. ST-LINK/V2-1 with support of SWD only
210
ST-LIN
K/V2-1 with support of SWD only
MB1184
C-01
6/15/2015
Title:
Size:
Reference:
Date:
Sheet:
of
A4
Revision:
STM32L476G-D
ISCO
Project:
USB
_DM
USB
_DP
STM_R
ST
T_JTCK
T_JT
CK
T_JT
MS
STM_J
TMS
STM_J
TCK
OSC
_IN
OSC
_OUT
T_NRST
AIN_1
3V3_ST
_LIN
K
3V3_ST
_LIN
K
SWIM_IN
USB
_DM
USB
_DP
USB VCC
1D-
2D+
3ID
4
GND
5SH
ELL
6
CN1
USB
-MIN
I-typeB
COM
ST-LIN
K Pow
er
3V3_ST
_LIN
K
Jumpers O
N --> D
ISCOVERY S
elected
Jumpers O
FF -->
ST-L
INK S
elected
Boa
rd Id
ent: PC13
=0
T_JT
CK
T_JT
MS
SWD
3V3_ST
_LIN
K
1234
CN3
SB5
SB3
SB6
SB4
SB9
SB7
SB10
SB8
STM_J
TMS
STM_J
TCK
SWCL
K
SWDIO
SWD
RESERVED
DEFAULT
3V3_ST
_LIN
K
T_SWDIO
_IN
T_SW
OLE
D_S
TLINK
LED_S
TLINK
3V3_ST
_LIN
KRed
_Green
21
34
LD1
LD_B
ICOLO
R_CMS
SWDIO
SWCL
KTC
K/SWCL
KTM
S/SW
DIO
Not Fitted
MCO
MCO
T_JRST
1 2 3 4 5 6
CN4
5075BMR-05-SM
AIN_1 T_NRST
T_SW
O
NRS
TT_
NRST
SB11
RC M
ust b
e very close to
STM
32F1
03 pin 29
51
2
GND
3
4
BYPA
SSIN
H
Vin
Vou
t
U1
LD3985M33R
D1
BAT6
0JFILM
TX RX
SB16
SB13
USA
RT_R
X
USA
RT_T
X
Close to JP
Not Fitted
STLINK_TX
STLINK_R
X
Not Fitted
LD2
LED, red
C7 100nF
C71
100nF
C6 100nF
C8 100nF
C5 1uF
C1 1uF
C2 100nF
C4100nF
C3 10nF
C10
20pF
C11
20pF
C73
100nF
C72
20pF
12
X1
8MHz
3V3_ST
_LIN
K
USB
_REN
UMn
PWR_EXT
PWR_E
Nn
3V3_ST
_LIN
K
3
1
2
T1 9013-SOT2
3
3V3_ST
_LIN
K
USB
_REN
UMn
PA14
PA13
PWR_E
Nn
TP2
TP1
EN1
GND 2
VO
4
NC
5
GND 7
VI
6PG
3U4
LD39050P
U33R
C14
1uF
C15
100nF
C13
1uF
C12
100nF
3V3_ST
_LIN
K
5 Volts Outpu
t3 Volts Outpu
t
5 Volts From Externa
l5V
_IN
5V_IN
5 Volts From USB
ST-LINK
JP4
3V3_ST
_LIN
K
3V3_ST
_LIN
K
VBA
T1
PA7 17
PC13
2
PA12
33PC
143
PB0 18
PC15
4JTMS/SW
DIO
34
OSC
IN5
PB1 19
OSC
OUT
6
VSS
_235
NRS
T7
PB2/BOOT1 20
VSS
A8
VDD_2
36
VDDA
9
PB10 21
PA0
10
JTCK/SWCLK37
PA1
11
PB11 22
PA2
12
PA15/JTDI38
PA3 13
VSS_1 23
PA4 14
PB3/JTDO39
PA5 15
VDD_1 24
PA6 16
PB4/JNTRST40
PB12
25
PB541
PB13
26
PB642
PB14
27
PB743
PB15
28
BOOT044
PA8
29
PB845
PA9
30
PB946
PA10
31
VSS_347
PA11
32
VDD_348
U3
STM32F1
03CBT
6
5V
D3
STPS
1L30
A
D2
STPS
1L30
A
JP1
5V_U
SB_S
T_LINK
5V_U
SB_S
T_LINK
MFX
_USA
RT3_RX
MFX
_USA
RT3_
TX
SB17
SB15
D4
BAT6
0JFILM
Not Fitted
1 2
CR1
CR2032 Holder
IN1
IN2
ON
3GND
4
SET
5
OUT
6OUT
7
FAULT
8
U2
ST890C
DR
51
2
GND
3
4
BYPA
SSIN
H
Vin
Vou
t
U12
LD3985M25R C4
7
1uF
C48
100nF
C49
10nF
C54
100nF
C55
1uF
2V5
5V
R11
10K_1%_0402
C9
100nF
12
3
JP6
D6
STPS
1L30
A3V3V
3_REG
R18
4K7_1%
_0402
R82
10K_1%_0402
R83
[NA]
R14
100K
_1%_0402
R86
100K
_1%_0402
R85
4K7_1%
_0402
R84
4K7_1%
_0402
R1 0_5%
_0402
R79 10
0_1%
_0402
R10
10K_1%_0402
R80_5%
_0402
R90_5%
_0402
R71K
5_1%
_04025V
_USB
_ST_
LINK
R78
36K_1%_0402
R2 1K_1%_0402
R19
2K7_1%
_0402
R80
100_1%
_0402
R81
100_1%
_0402
R17
22_1%_0402
R20
22_1%_0402
R21
22_1%_0402
R22
22_1%_0402
R13
[NA]
R12
10K_1%_0402
JP2
SWO
SB14
T_SW
OPB
3
R33
4K7_1%
_0402
3V3
3V3
3V3_REG
R4 330_1%
_0402
R5 330_1%
_0402
3V3_
REG
-ON3V
3_REG
-ON
JP3
R15
[NA]
2.5 Volts Outpu
t
SB1
SB29
SB28
T_JTDIT_JTDOSWIM
SWIM_RSTSWIM_RST_IN
R6100K
_1%_0402
3V3_REG
SB12
R16
2K7_1%
_0402
Ilim = 510mA
Isc= 1.2Ilim to 1.5Ilim = 612mA to 765mA
LD3
LED, red
R31K
_1%_0402
DocID027676 Rev 2 27/39
UM1879 Schematics
38
Figure 12. STM32L476VGT6 MCU
310
STM32L476VGT6 M
CU
MB11
84C-01
6/15/2015
Title:
Size:
Reference:
Date:
Sheet:
of
A4
Revision:
STM32L476G-D
ISCO
Project:
PA0
Must b
e close to th
e MCU
All this b
lock m
ust b
e very close to
the ST
M32L4
76
SWCL
KSW
DIO
SWDIO
SWCL
KPA
14PA
13
USA
RT_T
XUSA
RT_R
XPD
5USA
RT_T
XUSA
RT_R
X
PC14-O
SC32_IN
PC15-O
SC32_O
UT
SB19
SB20
Must b
e close to th
e Crystal
PE2
1
PE3
2PE
43
PE5
4PE
65
PC13
7
PC14
8PC
159
PH0
12PH
113
NRS
T14
PC0
15PC
116
PC2
17
PC3/VLC
D18
PA0
23PA
124
PA2
25
PA3
26PA
429
PA5
30PA
631
PA7
32
PC4
33PC
534
PB0
35
PB1
36
PB2
37
PE7
38PE
839
PE9
40
PE10
41
PE11
42PE
1243
PE13
44
PE14
45
PE15
46
PB10
47PB
1148
PB12
51
PB13
52PB
1453
PB15
54
PD8
55
PD9
56PD
1057
PD11
58
PD12
59
PD13
60PD
1461
PD15
62
PC6
63
PC7
64PC
865
PC9
66
PA8
67PA
968
PA10
69
PA11
70PA
1271
PA13
72
PA14
76
PA15
77
PC10
78
PC11
79PC
1280
PD0
81
PD1
82
PD2
83PD
384
PD4
85
PD5
86PD
687
PD7
88
PB3
89PB
490
PB5
91PB
692
PB7
93
BOOT0
94
PB8
95
PB9
96
PE0
97PE
198
U9A
STM32L4
76VGT6
VBA
T6
VSS
427
VSS
274
VRE
F-20
VRE
F+21
VDDA_A
DC
22
VSS
510
VDDUSB
73
VDD3
100
VSS
149
VDD2
75VDD1
50
VDD4
28
VSS
A_A
DC
19
VDD5
11
VSS
399
U9B
STM32L4
76VGT6
PA1
PA2
PA3
PA4
PA5
PA6
PA7
PA8
PA9
PA10
PA11
PA12
PA13
PA14
PA15
PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7
PB8
PB9
PB10
PB11
PB12
PB13
PB14
PB15
PC0
PC1
PC2
PC3
PC4
PC5
PC6
PC7
PC8
PC9
PC10
PC11
PC12
PC13
PD0
PD1
PD2
PD3
PD4
PD5
PD6
PD7
PD8
PD9
PD10
PD11
PD12
PD13
PD14
PD15
PE0
PE1
PE2
PE3
PE4
PE5
PE6
PE7
PE8
PE9
PE10
PE11
PE12
PE13
PE14
PE15
NRS
T
BOOT0
PC14
PH[0..1]
MCO
PH1-OSC
_OUT
SB21
SB22
MCO
12
X2
8MHz
SB18
PH0-OSC
_IN
PH0
PH1
QSP
I_D0
QSP
I_D3
QSP
I_D2
QSP
I_D1
QSP
I_CLK
QSP
I_CS
QSP
I_D0
QSP
I_D1
QSP
I_D2
QSP
I_D3
QSP
I_CS
QSP
I_CLK
SAI1_F
SSA
I1_S
DSA
I1_S
CK
I2C1_SC
LI2C1_SD
A
AUDIO_R
ST
SAI1_M
CK
AUDIO_D
INAUDIO_C
LK
OTG
_FS_
PowerSw
itchO
n
OTG
_FS_
DM
OTG
_FS_
DP
OTG
_FS_
ID
OTG
_FS_
VBU
S
OTG
_FS_
OverCurrent
SEG[0..23]
COM[0..3]
SEG[0..23]
COM[0..3]
EXT_
RST
EXT_
RST
LD_R
LD_G
LD_R
LD_G
NRS
TNRS
T
JOY_C
ENTE
RJO
Y_D
OWN
JOY_L
EFT
JOY_R
IGHT
JOY_U
P
JOY_C
ENTE
RJO
Y_D
OWN
JOY_L
EFT
JOY_R
IGHT
JOY_U
P
MFX
_USA
RT3_RX
MFX
_USA
RT3_
TXMFX
_USA
RT3_RX
MFX
_USA
RT3_
TX
MFX
_WAKEU
PMFX
_WAKEU
PMFX
_IRQ
_OUT
MFX
_IRQ
_OUT
MFX
_I2C
_SDA
MFX
_I2C
_SCL
MFX
_I2C
_SCL
MFX
_I2C
_SDA
PE10
PE11
PE12
PE13
PE14
PE15
PB6
PE2
PE3
PE4
PE5
PE6
PE7
PE9
PA0
PA1
PA2
PA3
PA4
PA5
PC13
PB10
PB11
PB2
PE8
PD0
PA11
PA12
PC9
SAI1_M
CK
AUDIO_R
ST
SAI1_F
S
SAI1_S
CKSA
I1_S
D
COM0
COM1
COM2
COM3
SEG0
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
SEG8
SEG9
SEG10
SEG11
SEG12
SEG13
SEG14
SEG15
SEG16
SEG17
SEG18
SEG19
SEG20
SEG21
SEG22
SEG23
GYRO
_CS
GYRO
_INT1
GYRO
_INT2
MEM
S_SC
K
GYRO
_CS
MEM
S_MISO
MEM
S_MOSI
MEM
S_SC
K
MEM
S_MISO
MEM
S_MOSI
GYRO
_INT1
GYRO
_INT2
MAG_C
SMAG_C
S
XL_
CS
XL_
CS
XL_
INT
MAG_D
RDY
MAG_D
RDY
XL_
INT
MAG_INT
MAG_INT
PE0
PE1
PC0
PC1
PC2
PD1
PD3
PD4
PD7
PD6
PA6
PA7
PA15
PB0
PB1
PB4
PB5
PB12
PB13
PB14
PB15
PC3
PC4
PC5
PC6
PC7
PC8
PD8
PD9
PD10
PD11
PD12
PD13
PD14
PD15
VLC
D
AUDIO_D
INAUDIO_C
LK
I2C1_
SCL
I2C1_
SDA
OTG
_FS_
OverCurrent
OTG
_FS_
VBU
S
OTG
_FS_
ID
OTG
_FS_
DM
OTG
_FS_
DP
OTG
_FS_
PowerSw
itchO
n
VDD_M
CU
C76
1uF_
X5R
_10%
_0603
R91
510_1%
_0402
L1 Ferrite
C35
100nF_
X7R
_10%
_0402
C74
1uF_
POL_
10%_T
ANA
C23
1uF_
POL_
10%_T
ANA
C79
1uF_
X5R
_10%
_0603
C82
100nF_
X7R
_10%
_0402
C81
100nF_
X7R
_10%
_0402
C75
100nF_
X7R
_10%
_0402
C29
100nF_
X7R
_10%
_0402
C80
100nF_
X7R
_10%
_0402
VDDA
VDDA
R24
47_1%_0402
C24
100nF_
X7R
_10%
_0402
VRE
F+
VRE
F+
VDD_M
CU
C83
100nF_
X7R
_10%
_0402
R90
0_5%
_0402
VDD_M
CU
3V
C78
20pF
_NPO
_5%_0402
C77
20pF
_NPO
_5%_0402
R89
0_5%
_0402
R26
0_5%
_0402
R25
0_5%
_0402
R88
220_1%
_0402
PC14
PH[0..1]
R31
4K7_1%
_0402
R32
4K7_1%
_0402
3V
R92
2K2_1%
_0402
R93
2K2_1%
_0402
PC14
PC15
PH1-OSC
_OUT
PH0-OSC
_IN
PC14-O
SC32_IN
PC15-O
SC32_O
UT
BOOT0
SWO
3V3_REG
-ON
3V3_REG
-ON
SWO
PB3
PB3
Not Fitted
PA8
PA9
PA10
PB9
PD2
PB7
PB8
PC10
PC11
PC12
PA9
PA10
SB24
SB25
Layout priority
to PA9
, PA1
0
R87
[NA]
X3
NX3215SA
-32.768K
PC15
PC15
C27
4.7pF_
NPO
_-+0
.25pF_
0402
C25
4.7pF_
NPO
_-+0
.25pF_
0402
Schematics UM1879
28/39 DocID027676 Rev 2
Figure 13. IDD measurement / MFX (Multi Function eXpander)
410
IDD m
easurement / MFX (Multi Function eXpander)
MB1184
C-01
6/15/2015
Title:
Size:
Reference:
Date:
Sheet:
of
A4
Revision:
STM32L476G-D
ISCO
Project:
VDD_M
CU
3V_M
FX
Current
direction
to M
CU
differential
amplifier
CAL
SH0
SH1
SH2
Shunts
3
4 5
G
S D
621
T3 STT7
P2UH7
3
4 5
G
S D
621
T7 STT7
P2UH7
3
4 5
G
S D
621
T9 STT7
P2UH7
3
4
5
G
SD
6
21
T5 STT7
P2UH7
3V3
decouplin
g capacitors
close to TSZ
122
MFX
_IRQ
_OUT
IDD_M
EAS
MFX
_SWCLK
CAL
SH2
SH1
MFX
_SWDIO
IDD_M
EAS
see n
ote *
SH1_
DSH
2_D
SH0_
D
CAL_
D
4
3 5
G
S D
6 7 821T2
STS9
P2UH7
3V_M
FX SH0_
D
SH0
4
3 5
G
S D
6 7 821T4
STS9
P2UH7
3V_M
FX CAL_
D
CAL
4
3 5
G
S D
6 7 821T6
STS9
P2UH7
SH1_
D
SH1
4
3 5
G
S D
6 7 821T8
STS9
P2UH7
SH2_
D
SH2
CAL_
D
CAL_
D
3V
3V_M
FX
one capacitor close to each MFX
pins:
VDD, V
DD
1, VDD
2, VDD
3
SH0
VDD_M
CU
MFX
_WAKEU
P
L2 Ferrite
MFX
_I2C
_SDA
MFX
_I2C
_SCL
12
3
JP5
bypass
R36
100K
_1%_0402
R37
100K
_1%_0
402
R39
1_1%
_0805
R43
24_1%_0805
R44
620_1%
_0805
R41
10K_1%_0
805
R34
100K
_1%_0402
R29
10K_1%_0
402
C33
100nF_
X7R
_10%
_0402
C34
1uF_
POL_
10%_T
ANA
C26
100nF_
X7R
_10%
_0402
R38
100K
_1%_0
402
R94
100K
_1%_0
402
MFX
_USA
RT3_RX
MFX
_USA
RT3_
TXMFX
_USA
RT3
_RX
MFX
_USA
RT3
_TX
3V_M
FX1 2 3 4
CN5
MFX
_SWCLK
MFX
_SWDIO
C30
100nF_
X7R
_10%
_0402
C31
100nF_
X7R
_10%
_0402
C28
100nF_
X7R
_10%
_0402
C37
100nF_
X7R
_10%
_0402
C40
1uF_
X5R
_10%
_0603
R51
100_1%
_0402
C39
100nF_
X7R
_10%
_0402
V+
V-
3 21
48
U11
ATS
Z122IST
5 67
U11B
TSZ1
22IST
V+
V-
3 21
48
U10
ATS
Z122IST
5 67
U10B
TSZ1
22IST
C36
100nF_
X7R
_10%
_0402
see n
ote *
see n
ote *
see n
ote *
Note *: tw
o footprints superim
posed allows to
also populate with SO-8 package.
(STS9P2UH7 P M
OS transistors)
LAYOUT PROPOSAL DRAW
ING
C38
100nF_
X7R
_10%
_0402
3V3
decouplin
g capacitors
close to TSZ
122
R27
0_5%
_0402
MFX
_I2C
_SCL
MFX
_I2C
_SDA
MFX
_WAK
EUP
MFX
_IRQ_O
UT
R28
510_1%
_0402
R35
[NA]
NRS
T
C32
[NA]
NRS
T
MFX
_I2C
_SCL
MFX
_I2C
_SDA
R30
0_5%
_0603
3V_M
FX
3V_M
FX3V
_MFX
3V_M
FX
PC13 PB10
PA4 PB11
SB27
SB26
D5
BAT6
0JFILM
VDD1
WAKEU
P2
IDD_C
AL/GPO
43
IDD_S
H0
4
IDD_S
H1/GPO
55
IDD_S
H2/GPO
66
NRS
T7
VSSA 8VDDA9
TSC_
XP/GPO
010
TSC_
XN/GPO
111
TSC_
YP/GPO
212
TSC_
YN/GPO
313
IDD_M
EAS
14
GPIO0
18GPIO1
19GPIO2
20
GPIO3
39GPIO4
40GPIO5
15
USA
RT_T
X21
USA
RT_R
X22
VSS_1 23
VDD_124
SPARE
25
GPIO6
16
GPIO7
17GPIO8
29GPIO9
30
GPIO10
31
GPIO11
32GPIO12
33GPIO13
26SW
DIO
34
VSS_2 35
VDD_236
SWCL
K37
IDD_S
H3/GPO
738
GPIO14
27
GPIO15
28
IDD_V
DD_M
CU
41
I2C_S
CL42
I2C_S
DA
43
BOOT0
44
I2C_A
DDR
45
IRQOUT
46
VSS_3 47
VDD_348
VDVVD
WA
WWK
AAEU
KKP
IDD_C
AL/GPO
4
IDD_S
H0
IDD_S
H1/GPO
5IDD_S
H2/GPO
6
NRS
T
VSSAVDDA
TSC_
XP/GPO
0TS
C_XN
XX/G
NNPO
1TS
C_YP/GPO
2TS
C_YN
YY/G
NNPO
3
IDD_M
EAS
GPIO0
GPIO1
GPIO2
GPIO3
GPIO4
GPIO5
USA
RAA
T_TX
USA
RAA
T_RX
RR
VSS_1
VDD_1
SPAR
AAERR
GPIO6
GPIO7
GPIO8
GPIO9
GPIO10
GPIO11
GPIO12
GPIO13
SWDIO
VSS_2
VDD_2
SWCL
K
IDD_S
H3/GPO
7
GPIO14
GPIO15
IDD_V
DD_M
CU
I2C_S
CLI2C_S
DA
BOOT0
I2C_A
DDR
IRQOUT
VSS_3
VDD_3
MFX_V2
U8
MFX
_V2
R47
6K04_1%_0402
R40
6K04_1%_0402
R49
15K_1%_0
402
R42
300K
_1%_0402
R50
300K
_1%_0402
R48
300K
_1%_0
402
DocID027676 Rev 2 29/39
UM1879 Schematics
38
Figure 14. Joystick ACP, LEDs and pushbutton
510
Joystick, ACP, LEDs and Push Button
MB11
84C-01
6/15/2015
Title:
Size:
Reference:
Date:
Sheet:
of
A4
Revision:
STM32L476G-D
ISCO
Project:
USE
R &
WAKE-UP Button
NRS
TNRS
T RES
ET Button
3V
1 234
B1
SW-PUSH-CMS_BLACK
SB23 C4
5
100nF
LD_R
LD_G
LD_R
LD_G
LD4
LED, red
LD5
LED, green
PB2
PE8
3V
JOY_C
ENTE
R
JOY_D
OWN
JOY_L
EFT
JOY_R
IGHT
JOY_U
P
PA0
Inpu
t pins with
pull-d
own
C41
100nF_
X7R
_10%
_0402
R52
0_5%
_0402
R53
100_1%
_0402
COMMON
5
CENTE
R2
DOWN
3LE
FT1
RIGHT
6
UP
4
62
1
4 3
B2 MT-00
8A
C44
100nF_
X7R
_10%
_0402
C46
100nF_
X7R
_10%
_0402
C42
100nF_
X7R
_10%
_0402
R56
0_5%
_0402
R58
0_5%
_0402
R54
0_5%
_0402
12
34
56
78
CN2
SSM-104-L-D
H
3V
EXT/RF E2P
Con
nector
5V
EXT_
RST
I2C1_SD
AI2C1_SC
LEX
T_RST
I2C1_SC
LI2C1_SD
A
PA1
PA2
PA3
PA5
R55
10K_1%_0
402
R59
10K_1%_0
402
Joys
tick
JOY_C
ENTE
R
JOY_D
OWN
JOY_L
EFT
JOY_R
IGHT
JOY_U
P
C43
100nF_
X7R
_10%
_0402
PD0
PB6
R45
1K_1%_0
402
R57
10K_1%_0
402
R46
330_1%
_0402
Not Fitted
SB2
PB7
Schematics UM1879
30/39 DocID027676 Rev 2
Figure 15. LCD display
610
LCD Display
MB1184
C-01
6/15/2015
Title:
Size:
Reference:
Date:
Sheet:
of
A4
Revision:
STM32L476G-D
ISCO
Project:
LCD
SEG[0..23]
COM[0..3]
SEG0 SE
G1 SE
G2 SE
G3 SE
G4 SE
G5 SE
G6
SEG7SE
G8SE
G9SE
G10SE
G11
SEG12
SEG13
SEG14
SEG15
SEG16
SEG17
SEG18
SEG19
SEG20
SEG21
SEG22
SEG23
COM0 COM1
COM2
COM3
SEG[0..23]
COM[0..3]
SEG0 1
SEG1 2
SEG2 3
SEG3 4
SEG4 5
SEG5 6
SEG6 7
SEG7 8
SEG8 9
SEG9 10
SEG10 11
SEG11 12
COM3 13
COM2 14COM115
COM016SEG1217
SEG1318SEG1419
SEG1520SEG1621
SEG1722SEG1823SEG1924SEG2025SEG2126
SEG2227SEG2328
U5
GH08
172T
U100
Socket DIP28
DocID027676 Rev 2 31/39
UM1879 Schematics
38
Figure 16. OTG USB FS
710
OTG USB FS
MB1184
C-01
6/15/2015
Title:
Size:
Reference:
Date:
Sheet:
of
A4
Revision:
STM32L476G-D
ISCO
Project:
5VOTG
_FS_
PowerSw
itchO
n
OTG
_FS_
OverCurrent
3V3_REG
OTG
_FS_
DM
OTG
_FS_
DP
OTG
_FS_
ID
PC9
PC10
PC11
R67
22R68
22
3V3_REG
3V3_REG
Dz
A2
IDA3
Pd1
B1
Pup
B2
Vbus
B3
D+in
C1
Pd2
C2
D+o
utC3
D-in
D1
GND
D2
D-out
D3
U15
EMIF02-U
SB03F2
GND
2
IN5
EN4
OUT
1FA
ULT
3U14
STMPS
2141ST
R
OTG
_FS_
VBUS
C67
4.7uF
3
1
2
T10
9013-SOT2
3
R63
[NA]
R71
330_1%
_0603
R65
47K_1%_0402
LD6
LED, green
VBUS
1
DM
2
DP
3ID
4GND
5
Shield
6
USB_Micro-AB receptacle
CN7
USB
-MICRO-AB
R72
47K_1%_0402
R66
0_5%
_0402
LD7
LED, red
R61
0_5%
_0402
R64
0_5%
_0402
R62
10K_1%_0402
PC12
PA11
PA12
R73
620_1%
_0603
Schematics UM1879
32/39 DocID027676 Rev 2
Figure 17. Audio DAC and microphone MEMS
810
Audio Codec and M
icrophone MEMS
MB1184
C-01
6/15/2015
Title:
Size:
Reference:
Date:
Sheet:
of
A4
Revision:
STM32L476G-D
ISCO
Project:
SAI1_F
SSA
I1_S
DSA
I1_S
CK
I2C1_SC
LI2C1_SD
A
AUDIO
_RST
SAI1_M
CK
3V
I2C address 0x94
2V5
3V
PE3
PB7
PB6
PE2
132CN6
ST-225-02
I2C1_SC
LI2C1_SD
A
SAI1_M
CK
SAI1_S
CK
SAI1_S
DSA
I1_F
SAUDIO_R
ST
SDA
1
SCL
2A0
3
SPKR_O
UTA
+4
VP
5
SPKR_O
UTA
-6
SPKR_O
UTB
+7
VP
8SP
KR_O
UTB
-9
-VHPF
ILT
10FL
YN
11
FLYP
12
+VHP
13
HP/LINE_
OUTB
14HP/LINE_
OUTA
15
VA
16
AGND
17FILT
+18
VQ
19TS
TO20
AIN4A
21AIN4B
22AIN3A
23AIN3B
24AIN2A
25AIN2B
26
AFILT
A27
AFILT
B28
AIN1A
29AIN1B
30
SPKR/HP
31
RES
ET32
VL
33
VD
34
DGND
35
TSTO
36
MCLK
37
SCLK
38SD
IN39
LRCK
40
GND/Therm
al Pad
41
U13
CS4
3L22
C68 1u
F_PO
L_10%_T
ANA
C65
100nF_
X7R
_10%
_0402
R60
10K_1%_0402
C56
1uF_
X5R
_10%
_0603
C66
1uF_
X5R
_10%
_0603
C59
150pF_
NPO
_5%_0603
C58
100nF_
X7R
_10%
_0402
C64
22nF
_X7R
_10%
_0603
PE4
PE5
PE6
C53
150pF_
NPO
_5%_0603
C60
1uF_
X5R
_10%
_0603
C50
100nF_
X7R
_10%
_0402
C62
100nF_
X7R
_10%
_0402
C51
100nF_
X7R
_10%
_0402
C57
1uF_
X5R
_10%
_0603
C52
100nF_
X7R
_10%
_0402
R70
51_1%_0402
C63
22nF
_X7R
_10%
_0603
R69
51_1%_0402
R76
0_5%
_0402
3V
PE9
PE7
3V
AUDIO_D
INAUDIO_C
LK
AUDIO_D
INAUDIO_C
LK
C70
100nF_
X7R
_10%
_0402
C69
100nF_
X7R
_10%
_0402
R77
0_5%
_0402
R75
[NA]
GND
5
LR2
CLK
3VDD
1
DOUT
4
U17
MP3
4DT0
1
GND
DocID027676 Rev 2 33/39
UM1879 Schematics
38
Figure 18. Quad-SPI Flash memory
910
Quad SPI Flash M
emory
MB11
84C-01
6/15/2015
Title:
Size:
Reference:
Date:
Sheet:
of
A4
Revision:
STM32L476G-D
ISCO
Project:
3V
Qua
d SP
I Flash
Mem
ory
QSP
I_D0
QSP
I_D3
QSP
I_D2
QSP
I_D1
QSP
I_CLK
QSP
I_CS
PE10
R74
10K_1%_0
402
C61
100nF_
X7R
_10%
_0402
DQ3/HOLD
#7
VCC
8S#
1
DQ1
2
C6
DQ0
5
VSS
4DQ2/Vpp/W
#3
DQ3/HOLD
#
VCC
S# DQ1
C DQ0
VSS
DQ2/Vpp/W
VV#
U16
N25Q128A
13EF
840E
QSP
I_D0
QSP
I_D1
QSP
I_D2
QSP
I_D3
QSP
I_CS
QSP
I_CLK
PE11
PE12
PE13
PE14
PE15
Schematics UM1879
34/39 DocID027676 Rev 2
Figure 19. Gyroscope, accelerometer, magnetometer MEMS
1010
Gyroscope, Accelerometer, Magnetometer M
EMS
MB1
184
C-01
6/15/2015
Title:
Size:
Reference:
Date:
Sheet:
of
A4
Revisio
n:
STM32L476G-D
ISCO
Project:
MEM
S
3V
GYRO
_CS
VDD_IO
1
GND
13C1
14
GND
8GND
9
VDD
16
CS_I2C
/SPI
5
INT1
7DRD
Y/IN
T26
GND
10GND
11
SA0/SD
O4
SDA/SDI/S
DO
3SC
L/SP
C2
VDD
15
GND
12
U7
L3GD20
C18
10uF
_X5R
_10%
_0603
C20
10nF
_X7R
_10%
_0603
C19
100nF_
X7R
_10%
_0402
SCL/SP
C1
INT_
XL
12
VDD
9VDD_IO
10DRD
Y_M
AG
11
GND
6C1
5SD
A/SDI/S
DO
4GND
8IN
T_MAG
7
CS_M
AG
3CS
_XL
2
U6
LSM303C
TR
C16
100nF_
X7R
_10%
_0402
C21
10uF
_X5R
_10%
_0603
C17
100nF_
X7R
_10%
_0402
C22
100nF_
X7R
_10%
_0402
MAG_C
S
MAG_INTXL_
INT
PC0
MAG_C
S
MAG_INT
GYRO
_INT1
MAG_D
RDY
MEM
S_SC
K
MAG_D
RDY
PC1
PC2
MEM
S_MOSI
GYRO
_INT2
XL_
CS
XL_
INT
PD1
PD4
PD7
PD2
PB8
PE0
PE1
MEM
S_SC
K
GYRO
_CS
MEM
S_MISO
MEM
S_MOSI
PD1
PD3
PD4
MEM
S_SC
K
MEM
S_MISO
MEM
S_MOSI
GYRO
_INT1
GYRO
_INT2
XL_
CS
3V
R23
1K_1%_0
402
DocID027676 Rev 2 35/39
UM1879 Power consumption measurements
38
Appendix A Power consumption measurements
The power consumption measurements of the STM32L476 discovery board are reflected in Figure 20. Please note the GPIO configuration of the STM32L476VGT6 in Standby mode.
Figure 20. Power consumption tree
3V3_REG
JP6
Measured 287µA 3V3 287-115 => 172µA 172-92 => 80µA
Measured 115 µA
D6
3V
Measured 92µA
LDO
SB28
For IDDTSZ122 1st stage
V+ : ~11µA due to resistors bridgeV- : ~11µA due to resistors bridge
115-70 => 45µA
Measured 70µA
R30
Audio QuadSPIL3GD20
DACLSM303
CTR
3V_MFX 70-0.4 => 69.6µA
Measured 0.4µA
JP5
VDD_MCU
MFXSTM32L152
For IDDTSZ122
2nd stage
V+ : ~10µA due to resistors bridge
STM32L476VGT6
STM32L476VGT6 GPIOs are configured in ‘Analog input’ except: PWR->PUCRA = 0; // no PU on GPIOA PWR->PDCRA = 0x2F; // PD on GPIOA[0,1,2,3,5] PWR->PUCRB = 0; // no PU on GPIOB PWR->PDCRB = 0; // no PD on GPIOB PWR->PUCRC = 0x1; // PU on GPIOC[0] MAG_CS PWR->PDCRC = 0x800; // PD on GPIOC[11] PWR->PUCRD = 0x80; // PU on GPIOD[7] MEMS_SPI_CS PWR->PDCRD = 0x12; // no PD on GPIOD[1,4] MEMS_SPI_CLK, MEMS_SPI_MOSI PWR->PUCRE = 0x0001; // PU on GPIOE[0] XL_CS PWR->PDCRE = 0x0200; // PD on GPIOE[9] AUDIO_CLK for DMIC PWR->PDCRE|= 0x0074; // PD on GPIOE[2,4,5,6] SAI1 interface to CODEC PWR->PDCRE|= 0xF400; // PD on GPIOE[10,12,13,14,15] QuadSPI CLK, D0,D1,D2,D3 PWR->PUCRF = 0; // no PU on GPIOF PWR->PDCRF = 0; // no PD on GPIOF PWR->PUCRG = 0; // no PU on GPIOG PWR->PDCRG = 0; // no PD on GPIOG PWR->PUCRH = 0; // no PU on GPIOH PWR->PDCRH = 0; // no PD on GPIOH
Power consumption measurements UM1879
36/39 DocID027676 Rev 2
The total power consumption of the STM32L476 discovery board measured is 287µA which is as expected:
Table 8 gives for each peripheral the theoretical power consumption value. It’s extracted from the vendor’s product datasheet. The typical values are given under the same conditions as used for the power consumption measurement above. Please refer to those product datasheets for more details about the conditions.
The theoretical total power consumption of the STM32L476 discovery board is ~295uA.
Table 8. Typical power consumption of the STM32L476 discovery board
MB1184-C01
component.
Typical theoretical
consumption (uA)
Conditions
LD3985M25R_U12 85 On mode: VINH=1.2V
TSZ122IST_U10 58 -
Differential + 11 Current in R40+R42
Differential - 11 Current in R47+R50
CS43L22_U13 0 Reset pin 32 and all clocks and lines are hold Low
MP34DT01_U17 33 IddPdn, input clock in static mode
N25Q128A13EF840E_U16 14 Standby current
L3GD20_U7 5 IddPdn, Supply current in power-down mode
LSM303CTR_U6 10 IddPdn, current consumption in power-down mode
TSZ122IST_U11 58 -
Bridge Op Amp 10 Current in R48+R49
MFX_U8 0.3Standby mode. All GPIOs in ‘Analog Input’ except WAKEUP input with external PD (R34)
STM32L476VGT6_U9 0.3Standby mode, GPIOs configuration described above
TOTAL STM32L476 discovery
295.6 -
DocID027676 Rev 2 37/39
UM1879 Mechanical drawing
38
Appendix B Mechanical drawing
Figure 21. STM32L476 discovery board mechanical drawing
Revision history UM1879
38/39 DocID027676 Rev 2
Revision history
Table 9. Document revision history
Date Revision Changes
17-Jul-2015 1 Initial release.
04-Aug-2015 2 Added Section 5: Bootloader limitations.
DocID027676 Rev 2 39/39
UM1879
39
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