UM1735
User manual
Discovery kit for STM32F3 series with STM32F334C8 MCU
Introduction
The STM32F334 discovery kit (32F3348DISCOVERY) helps the user discover the full range
of features of the STM32F334 line and develop applications. It is based on
STM32F334C8T6 and includes ST-LINK/V2-1 embedded debug tool interface,
high-brightness LED dimming with buck converter, buck/boost converter, LEDs and
pushbuttons.
The board comes with a comprehensive STM32 software HAL library with various packaged
software examples, as well as direct access to mbed™ online resources at http://mbed.org.
Figure 1. STM32F334 discovery board
Picture not contractual.
February 2016
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www.st.com
Contents
UM1735
Contents
1
Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2
Ordering and product information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1
Product marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2
Order code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4
Hardware layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.1
4.2
Embedded ST-LINK/V2-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.1.1
Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.1.2
ST-LINK/V2-1 firmware upgrade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.1.3
VCP configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.1.4
Using ST-LINK/V2-1 to program/debug the STM32F334 MCU
on board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.1.5
Using ST-LINK/V2-1 to program/debug an external STM32 application 15
Power supply and power selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.2.1
Power supply input from the USB connector . . . . . . . . . . . . . . . . . . . . . 17
4.2.2
External power supply inputs: 5V_IN . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.3
LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.4
Pushbuttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.5
High brightness LED dimming with buck converter . . . . . . . . . . . . . . . . . 18
4.6
Buck/boost converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.7
JP3 (Idd) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.8
BOOT0 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.9
USART configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.10
OSC clock supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.11
Solder bridges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.12
Extension connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5
Mechanical drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
6
Electrical schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
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Contents
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
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3
List of tables
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List of tables
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Table 6.
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ON/OFF conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Jumper states . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Debug connector CN2 (SWD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Solder bridges. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Extension connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
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List of figures
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10.
Figure 11.
Figure 12.
Figure 13.
STM32F334 discovery board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
STM32F334 discovery board hardware block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Top layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Bottom layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Updating the list of drivers in device manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
STM32F334 discovery board connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
ST-LINK/V2-1 connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
STM32F334 discovery board mechanical drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
STM32F334 discovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
ST-LINK/V2-1 (SWD only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
STM32F334C8T6 MCU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
LED buck converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Buck/boost converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
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Conventions
1
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Conventions
Table 1 provides the definition of some conventions used in the present document.
Table 1. ON/OFF conventions
Convention
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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 open
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2
Ordering and product information
Ordering and product information
The STM32F334 discovery kit is a low-cost and easy-to-use development kit to quickly
evaluate and start a development with an STM32F3 series microcontroller.
Before installing and using the product, please accept the Evaluation Product License
Agreement from www.st.com/epla.
For more information on the STM32F334 discovery board and for demonstration software,
visit www.st.com/stm32f3-discovery.
2.1
Product marking
Tools marked as "ES" or "E" are not yet qualified and as such, they may be used only for
evaluation purposes. ST shall not be liable for any consequences related with other ways of
use of such non-qualified tools, for example, as reference design or for production.
Examples of location of "E" or "ES" marking:
2.2
•
on target STM32 microcontroller part mounted on the board (for illustration, refer to
section "Package information" in its datasheet at www.st.com)
•
next to the evaluation tool ordering part number, as a label stuck or a silk-screen
printed on the board
Order code
To order the Discovery kit for STM32F334 line microcontrollers, use the order code:
STM32F3348-DISCO.
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Features
3
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Features
The STM32F334 discovery board offers the following features:
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•
STM32F334C8T6 microcontroller featuring 64 Kbytes of Flash memory, 16 Kbytes of
RAM in an LQFP48 package
•
on-board ST-LINK/V2-1 with selection mode switch to use the kit as a standalone
programming and debugging tool (with SWD connector for programming and
debugging)
•
mbed™-enabled (mbed.org)
•
USB ST-LINK with re-enumeration capability and three different interfaces:
–
virtual COM port
–
mass storage
–
debug port
•
board power supply: through USB bus or from an external 5 V supply voltage
•
external application power supply: 3 V and 5 V
•
high brightness LED dimming with buck converter
•
one buck/boost converter
•
six LEDs:
–
LD1 (red) for 3.3 V power on
–
LD2 (red/green) for USB communication
–
four user LEDs: LD3 (red), LD4 (orange), LD5 (green) and LD6 (blue)
•
two pushbuttons (user and reset)
•
extension header for LQFP48 I/Os for a quick connection to the prototyping board and
easy probing
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4
Hardware layout
Hardware layout
The STM32F334 discovery board has been designed around the STM32F334C8T6
microcontroller in a 48-pin LQFP package.
Figure 2 illustrates the connections between the STM32F334C8T6 and its peripherals
(ST-LINK/V2-1, high brightness LED dimming with buck converter, buck/boost converter,
LEDs, pushbuttons).
Figure 3 and Figure 4 help you to locate these features on the STM32F334 discovery board.
Figure 2. STM32F334 discovery board hardware block diagram
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Hardware layout
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Figure 3. Top layout
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Hardware layout
Figure 4. Bottom layout
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Hardware layout
4.1
UM1735
Embedded ST-LINK/V2-1
The ST-LINK/V2-1 programming and debugging tool is integrated on the STM32F334
discovery board.
The embedded ST-LINK/V2-1 tool supports only SWD for STM32 devices. For information
about debugging and programming features, refer to user manual UM1075 (ST-LINK/V2 incircuit debugger/programmer for STM8 and STM32) that describes in detail all the STLINK/V2 features.
The changes versus ST-LINK/V2 are listed below.
•
•
New features supported on ST-LINK/V2-1:
–
USB software re-enumeration
–
virtual COM port interface on USB (Section 4.1.3)
–
mass storage interface on USB
–
USB power management request for more than 100 mA power on USB
Features not supported on ST-LINK/V2-1:
–
SWIM interface
–
minimum supported application voltage limited to 3 V
There are two different ways to use ST-LINK/V2-1, depending on the jumper states (see
Table 2):
•
program/debug the MCU on board (Section 4.1.4)
•
program/debug an MCU in an external application board using a cable connected to
SWD connector CN3 (Section 4.1.5)
Table 2. Jumper states
Jumper state
4.1.1
Description
Both CN3 jumpers ON
ST-LINK/V2-1 functions enabled for on board programming (default)
Both CN3 jumpers OFF
ST-LINK/V2-1 functions enabled for application through external CN2
connector (SWD supported)
Drivers
ST-LINK/V2-1 requires a dedicated USB driver that, for Windows XP, 7 and 8, can be found
at www.st.com.
In case the STM32F334 discovery board is connected to the PC before the driver is
installed, some discovery interfaces may be declared as “Unknown” in the PC device
manager. In this case the user must install the driver files (Figure 5), and from the device
manager update the driver of the connected device.
Note:
12/33
Prefer using the “USB Composite Device” handle for a full recovery.
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Hardware layout
Figure 5. Updating the list of drivers in device manager
4.1.2
ST-LINK/V2-1 firmware upgrade
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 new functionality, bug fixes, support for new microcontroller families), it is
recommended to visit www.st.com periodically in order to stay up-to-date with the latest
firmware version.
4.1.3
VCP configuration
ST-LINK/V2-1 supports virtual COM port (VCP). To enable this function, the solder bridges
SB14 and SB16 (See Figure 4: Bottom layout) for mbed support are closed. Table 4: Solder
bridges indicates this with ON state.
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Hardware layout
4.1.4
UM1735
Using ST-LINK/V2-1 to program/debug the STM32F334 MCU
on board
To program the STM32F334 MCU on board, simply plug in the two jumpers on CN3, as
shown in Figure 6 in red, but do not use the CN2 connector as that could disturb
communication with the STM32F334C8T6 of the STM32F334 discovery board.
Figure 6. STM32F334 discovery board connections
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4.1.5
Hardware layout
Using ST-LINK/V2-1 to program/debug an external STM32 application
It is very easy to use ST-LINK/V2-1 to program an STM32 microcontroller on an external
application. Simply remove the 2 jumpers from CN3 as shown in Figure 7 and connect your
application to the CN2 debug connector according to Table 3.
Note:
SB11, must be OFF if you use CN2 pin 5 (NRST) in your external application.
SB17, must be OFF if you use CN2 pin 6 (SWO) in your external application.
Table 3. Debug connector CN2 (SWD)
Pïn
CN2
Designation
1
VDD_TARGET
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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Hardware layout
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Figure 7. ST-LINK/V2-1 connections
4.2
Power supply and power selection
The power supply is provided either by the host PC through the USB cable, or by an
external 5 V power supply.
The STM32F334 discovery board requires to the Host PC 500mA, but around 300mA is
needed for its demo, 100mA for an extension board and a safety margin of 100mA.
The D2 and D3 diodes protect the 5 V pins from external power supplies:
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•
5 V and 3 V can be used as output power supplies when an extension board is
connected to pins P1 and P2.
In this case, the 5V_O and 3V_O pins deliver a 5 V or 3.3 V power supply and the
power consumption of the extension board must be lower than 100 mA.
•
5 V can also be used as input power supplies, e.g. when the USB connector is not
connected to the PC. ( 5V_I pin of P1 Header)
In this case, the STM32F334 discovery board must be powered by a power supply unit
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Hardware layout
or by auxiliary equipment complying with standard EN-60950-1: 2006+A11/2009, and
must be Safety Extra Low Voltage (SELV) with limited power capability.
4.2.1
Power supply input from the USB connector
ST-LINK/V2-1 supports USB power management allowing to request more than 100 mA
current to the host PC.
All parts of the STM32F334 discovery board and extension board can be powered from the
ST-LINK/V2-1 USB connector CN1 (U5V or VBUS). Note that only the ST-LINK/V2-1 part is
power supplied before the USB enumeration as the host PC only provides 100 mA to the
board at that time. During the USB enumeration, the STM32F334 discovery board requires
500 mA of current to the Host PC. If the host is able to provide the required power, the
targeted STM32 microcontroller is powered and the red LED LD1 is turned on, thus the
STM32F334 discovery board and its extension board can consume a maximum of 500 mA
current, not more. If the host is not able to provide the required current, the targeted STM32
microcontroller and the MCU part including the extension board are not power supplied. As
a consequence the red LED LD1 remains turned OFF. In such case it is mandatory to use
an external power supply as explained in the next chapter.
Warning: If the maximum current consumption of the STM32F334 discovery and its
extension boards exceeds 500 mA, it is mandatory to power the STM32F334 discovery
using an external power supply connected to 5V_IN.
Note:
In case of this board is powered by an USB charger or USB battery then there is no USB
enumeration so the led LD1 remains OFF permanently and the target MCU is not powered.
In this specific case the jumper JP1 needs to be ON to allow target MCU to be powered
anyway. This is a special use without enumeration and JP1 is not soldered. To use this
optional power supply, solder a 2 pins header in JP1 and set a jumper (you can use a
jumper plugged on P3 or P4)
4.2.2
External power supply inputs: 5V_IN
The external power source 5V_IN is automatically detected, in this case the current
consumption of STM32F334 discovery board and extension board exceed the allowed
current on USB. In this condition it is still possible to use the USB for communication, for
programming or debugging only, but it is mandatory to power supply the board first using
5V_IN then connect the USB 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_IN.
2.
Power on the external power supply 5V_IN.
3.
Check that LD1 is turned on.
4.
Connect the PC to USB connector CN1.
If this order is not respected, the board may be supplied by VBUS first then by 5V_IN, and
the following risks may be encountered:
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Hardware layout
4.3
4.4
4.5
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1.
If more than 500 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.
500 mA is requested at enumeration (since JP1 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 LD1 remains OFF).
LEDs
•
LD1 PWR:
The red LED indicates that the board is powered.
•
LD2 COM:
LD2 default status is red. LD2 turns to green to indicate that communications are in
progress between the PC and ST-LINK/V2-1.
•
User LD3:
The red LED is a user LED connected to the I/O PB6 of the STM32F334C8T6.
•
User LD4:
The orange LED is a user LED connected to the I/O PB8 of the STM32F334C8T6.
•
User LD5:
The green LED is a user LED connected to the I/O PB9 of the STM32F334C8T6.
•
User LD6:
The blue LED is a user LED connected to the I/O PB7 of the STM32F334C8T6.
Pushbuttons
•
B1 USER:
User and Wake-Up button connected to the I/O PA0 of the STM32F334C8T6.
•
B2 RESET:
The pushbutton connected to NRST is used to RESET the STM32F334C8T6.
High brightness LED dimming with buck converter
The STM32F334 discovery integrates a high brightness LED dimming feature. This function
has been designed with on-chip peripherals MCU to reduce the number of external
components generally included in analog components based solutions for LED dimming.
The default LED Voltage supply is 5 Volts from 5V_OUT signal or can be provided by an
external voltage through CN4 (Vext signal) and by removing the solder of SB18. This
external voltage must be between 5 and 15 Volts.
LED information:
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•
reference LE-CWC12100-D, 1W, Everluck
•
VF = 2.8V Typical
•
IF = 350mA Max
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Hardware layout
To design a high brightness LED dimming application, refer to the following documentation
and firmware:
•
For details concerning I/O ports, refer to the STM32F334C8T6 datasheet.
•
For information on software development, see DISCOVER application software on
www.st.com/stm32f3-discovery.
•
For more detail concerning high brightness LED dimming, refer to AN4885 high
brightness LED dimming using the STM32F334 discovery kit.
•
STM32Cube library available from www.st.com/stm32f3-discovery.
Warning: The high brightness of this LED can be very dangerous for your eyes...
For safety reasons, the maximum high brightness LED forward current has been limited by
software to 250 mA and an optical cube-shaped protection has been placed over the LED.
Do not override this current limitation and do not remove the optical protection while the
LED is operating.
The STM32F334C8T6 MCU controls this high brightness LED dimming feature through the
High-Resolution Timers interface.
Note:
If LED buck converter is used then buck/boost converter cannot be enabled.
4.6
Buck/boost converter
The STM32F334 discovery includes a buck/boost converter. This DC/DC converter function
has been designed with on-chip peripherals MCU and is able to convert an input Voltage
(Vin on CN5) from 3 Volts to 15 Volts to an output voltage (Vout on CN7) from 3 Volts to 15
Volts.
Input current on Vin (CN5) or output current on Vout (CN7) are limited to 500 mA max.
Whatever the input or output voltage conditions are.
The STM32F334C8T6 MCU controls this Buck / Boost converter feature through the HighResolution Timers interface.
To design a buck/boost converter application, refer to the following documentation and
firmware:
•
For details concerning I/O ports, refer to the STM32F334C8T6 datasheet.
•
For information on software development, see DISCOVER application software on
www.st.com/stm32f3-discovery.
•
For more detail concerning the buck/boost converter, refer to AN4449 buck boost
converter using the STM32F334 discovery kit.
•
STM32Cube library available from www.st.com/stm32f3-discovery.
Note:
If buck/boost converter is used then LED buck converter cannot be enabled.
4.7
JP3 (Idd)
Jumper JP3, labeled Idd, allows the consumption of STM32F334C8T6 to be measured by
removing the jumper and connecting an ammeter.
•
Jumper on: STM32F334C8T6 is powered (default).
•
Jumper off: an ammeter must be connected to measure the STM32F334C8T6 current,
(if there is no ammeter, the STM32F334C8T6 is not powered).
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Hardware layout
4.8
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BOOT0 Configuration
BOOT0 is at level “0” through a pull-down R31. If you want to set BOOT0 at level “1”, it can
be configured by setting a jumper between P2.6 (BOOT0) and P2.5 (VDD).
This facility is offered for fast and instantaneous configuration.
Note:
If you need to set BOOT0 at level "1" continuously, then unsolder the resistor R31 to avoid a
consumption of 6 mA while connecting pin P2.6 (BOOT0) and P2.5 (VDD) with a jumper or
with a wire.
4.9
USART configuration
The USART2 interface available on PB3 and PB4 of the STM32F334C8T6 can be
connected to ST-LINK/V2-1 MCU to use the virtual COM port function.
By default the USART2 communication between the target STM32F334C8T6 and
ST-LINK/V2-1 MCU is not enabled.
To use the virtual COM port function with:
4.10
•
The on-board STM32F334C8T6, then set SB14 and SB16 ON.
•
An external MCU then remove solder from SB14 and SB16, solder an 2 pins header on
JP4, then you can connect RX and TX of the external MCU directly to RX and TX of
JP4.
OSC clock supply
If PF0 and PF1 are only used as GPIOs instead of as a clock, then SB13 and SB15 are
closed and R29 and R30 are removed. (SB12 must be open)
MCO from ST-LINK/V2-1 (from MCO of the STM32F103CBT6)
This frequency cannot be changed, it is fixed at 8 MHz and connected to PF0-OSC_IN of
the STM32F334C8T6. The configuration needed is:
–
SB12 closed and SB13 open
–
R30 removed
HSE Oscillator on board from X2 crystal (not provided)
For typical frequencies and its capacitors and resistors, please refer to the
STM32F334C8T6 Datasheet. The configuration needed is:
–
SB12, SB13, SB15 open
–
X2, R29, R30, C20, C21 soldered
Oscillator from external PF0 (from external oscillator through pin 7 of the P1 connector)
The configuration needed is:
Note:
20/33
–
SB13 closed
–
SB12 open
–
R30 removed
Please refer to the AN2867 for oscillator design guide for STM32 microcontrollers.
DocID025953 Rev 2
UM1735
4.11
Hardware layout
Solder bridges
Table 4. Solder bridges
Bridge
SB13, 15 (X2 crystal)
SB3,5,8,10 (default)
(1)
State
Description
OFF
X2, C20, C21, R29 and R30 provide a clock. PF0, PF1 are disconnected from P1.
ON
PF0, PF1 are connected to P1 Remove only R29 and R30
ON
Reserved, do not modify
SB2,4,7,9 (reserved) OFF
SB20 (B2-RESET)
SB21 (B1-USER)
SB14, 16
(VCP RX, TX)(2)
SB18 (Vext)
SB22 (L3)
SB1 (ST-LINK/V2-1
PWR)
SB19 (LED)
SB11 (NRST)
SB17 (SWO)
SB6 (STM_RST)
SB12 (MCO)
Reserved, do not modify
ON
B2 Push Button is connected to NRST of STM32F334C8T6
OFF
B2 Push Button is not connected to NRST of STM32F334C8T6
ON
B1 Push Button is connected to PA0
OFF
B1 Push Button is not connected to PA0
OFF
PA2, PA3 of STM32F103CBT6 are not connected to PB4, PB3 of
STM32F334C8T6
ON
PA2, PA3 of STM32F103CBT6 are connected to PB4, PB3 of STM32F334C8T6,
then SW0 cannot be used and SB17 must be OFF
ON
LED Buck is powered from 5V_OUT
OFF
LED Buck is powered from CN4
ON
Default position.
OFF
Use CN6 for Current measurement.
ON
ST-LINK/V2-1 module is powered
OFF
ST-LINK/V2-1 module is not powered
ON
Default position.
OFF
Use it connecting 2 wires for Current measurement.
ON
T_NRST signal from connector CN2 and STM32F103CBT6, is connected to
NRST of STM32F334C8T6
OFF
T_NRST signal is not connected
OFF
SWO signal is not connected
ON
SWO signal of connector CN3 is connected to PB3, then USART_TX cannot be
used and SB16 must be OFF
OFF
No incidence on NRST signal of STM32F103CBT6
ON
NRST signal of STM32F103CBT6 is connected to GND
ON
MCO clock signal from STM32F103CBT6 is connected to OSC_IN of
STM32F334C8T6.
OFF
MCO signal of STM32F103CBT6 is not used.
1. Default value is in bold.
2. Default state is OFF for boards labeled MB1142 B-01 and older.
DocID025953 Rev 2
21/33
32
Hardware layout
4.12
UM1735
Extension connectors
The male headers P1 and P2 can connect the STM32F334 discovery board to a standard
prototyping/wrapping board. STM32F334C8T6 GPI/Os are available on these connectors.
P1 and P2 can also be probed by an oscilloscope, logical analyzer or voltmeter.
Table 5. Extension connectors
22/33
DocID025953 Rev 2
SBx(1)
SB21 SB11, 20
-
-
-
-
-
CN7
-
-
-
19
-
18
-
CN5
-
-
17
-
16
-
P2
-
15
-
14
-
-
P1
-
-
13
-
-
Power Supply
-
12
-
-
11
-
-
9
-
2
-
-
2
6
-
Free I/O
PA7 PA6 PA5 PA4
Buck LED
-
Vout Vin Buck/boost
P1_Drive
-
-
-
Vout_Sense
Vin_Sense
-
LED
-
PushButtons
-
-
VCP
-
RESET
-
-
USER
29
-
PA8
-
17
-
PA7
-
16
-
PA6
-
15
-
PA5
-
14
-
PA4
-
13
-
PA3
-
12
-
PA2
-
11
-
PA1
-
10
-
PA0
-
7
-
BOOT0
NRST
-
SYSTEM
44
NRST
-
BOOT0
-
-
-
LQFP48 pin num.
Board funtion
-
-
Main function
MCU pin
PA15
38
PB0
18
PB1
19
PB2
20
-
PB3
39
SWO
PB4
40
PB5
41
PB6
42
DocID025953 Rev 2
-
-
-
8
-
-
SB14
SB17, 16
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
SBx(1)
CN7
CN5
-
-
21
-
20
-
P2
19
-
P1
-
-
-
-
Power Supply
Free I/O
-
-
-
Buck LED
-
-
-
-
-
-
-
PA12
-
12
-
LED
PushButtons
VCP
13
-
-
-
-
-
-
14
-
-
-
-
-
P2_Drive N2_Drive N1_Drive Buck/boost
-
-
-
-
-
-
-
-
15
-
-
-
-
-
-
-
16
-
-
-
PA15
-
-
-
BK_Sense
-
-
-
-
-
-
-
-
-
-
-
-
17
-
9
-
-
-
-
-
PB2 PB1
-
-
-
-
-
18
-
-
-
-
10
-
-
-
-
-
-
-
11
-
-
-
PB5
-
-
-
-
-
-
-
USART_RX USART_TX
MCU pin
-
-
-
RED
-
-
-
-
-
-
37
SYSTEM
PA14
-
34
-
PA13
-
33
-
PA12
SWCLK SWDIO
32
-
PA11
-
31
-
PA10
-
30
-
LQFP48 pin num.
PA9
-
Main function
UM1735
Hardware layout
Table 5. Extension connectors (continued)
Board funtion
23/33
32
24/33
DocID025953 Rev 2
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
SB15
-
SB12, 13
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
1
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
SBx(1)
CN7
CN5
-
P2
-
23
-
-
P1
-
-
-
Power Supply
Free I/O
Buck LED
Buck/boost
-
-
-
-
-
-
-
-
-
-
-
-
-
-
22
-
1
-
PushButtons
VCP
3
-
-
-
-
4
-
-
8
-
-
-
GREEN ORANGE BLUE LED
-
-
7
-
7
-
6
-
5
-
-
-
-
-
4
-
-
-
-
-
PB13
-
-
-
-
-
PB11 PB10
-
BK_Drive
-
-
-
-
-
-
-
-
-
-
RC
-
-
-
-
-
-
-
-
-
-
20
-
PC15 PC14 PC13 PB15
-
-
-
-
-
21
-
-
-
-
-
-
-
22
-
-
-
-
-
-
-
23
-
5V_IN 3V
6
-
PF1
-
5
-
PF0
-
MCU pin
-
4
-
PC15
-
3
-
PC14
-
2
-
PC13
-
28
-
PB15
-
27
SYSTEM
PB14
-
26
-
PB13
-
25
-
PB12
-
22
-
PB11
-
21
-
PB10
-
46
-
PB9
-
45
-
LQFP48 pin num.
PB8
OSC_OUT OSC_IN
Main function
43
-
-
-
PB7
-
-
-
Hardware layout
UM1735
Table 5. Extension connectors (continued)
Board funtion
UM1735
Hardware layout
Table 5. Extension connectors (continued)
SBx(1)
-
-
-
-
-
-
25
-
-
CN7
-
25
-
10
-
-
CN5
-
1
-
1
-
-
P2
2
-
-
-
P1
2
-
-
-
5
-
VDD VDD VDD VDD 5V_OUT Power Supply
3
GND GND GND GND
Free I/O
-
-
-
-
-
-
-
-
-
-
8
-
-
VSSA
-
Buck LED
47
-
-
GND
-
-
35
-
Buck/boost
-
GND
-
-
-
23
-
-
-
GND
-
LED
-
9
-
-
-
VDDA
-
-
PushButtons
1
-
-
VBAT
-
48
-
VCP
VDD
-
-
36
-
VDD
-
SYSTEM
24
-
-
VDD
-
-
LQFP48 pin num.
Board funtion
-
Main function
MCU pin
1. Signals available depending on SBx value. Refer to Table 4: Solder bridges or schematics in Section 6.
DocID025953 Rev 2
25/33
32
Mechanical drawing
5
UM1735
Mechanical drawing
Figure 8. STM32F334 discovery board mechanical drawing
26/33
DocID025953 Rev 2
VDD
3V_OUT
PB4
PB3
BOOT0
PB7
PB6
PB5
PB4
PB3
PA15
PA14
PA13
PA12
PA11
PA10
PA9
PA8
PB15
PB14
PB13
PB12
NC
GND
PB9
PB8
USART_RX
USART_TX
DocID025953 Rev 2
Header 25
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
P2
USART_RX
USART_TX
NRST
MCO
SWCLK
SWDIO
SWO
PA14
PA13
PB3
T_NRST
MCO
SWCLK
SWDIO
SWO
NRST
N1_Drive
N2_Drive
P1_Drive
P2_Drive
NRST
B_USER
BK_Sense
BK_Drive
N1_Drive
N2_Drive
P1_Drive
P2_Drive
N1_Drive
N2_Drive
P1_Drive
P2_Drive
SWCLK
SWDIO
SWO
MCO
NRST
N1_Drive
N2_Drive
P1_Drive
P2_Drive
RC
Vin_Sense
Vout_Sense
BK_Sense
BK_Drive
LD_U
LD_D
LD_L
LD_R
PC13
PC14
PC15
PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7
PB8
PB9
PB10
PB11
PB12
PB13
PB14
PB15
RC
Vin_Sense
Vout_Sense
LD_U
LD_D
LD_L
LD_R
USART_RX
USART_TX
U_BUCK_BOOST
BUCK_BOOST.SchDoc
NRST
B_USER
BK_Sense
BK_Drive
U_BUCK_LED
BUCK_LED.SchDoc
SWCLK
SWDIO
SWO
MCO
NRST
BOOT0
B_USER
PF0
PF1
PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
PA8
PA9
PA10
PA11
PA12
PA13
PA14
PA15
U_STM32Fx
STM32Fx.SchDoc
BOOT0
B_USER
PF0
PF1
PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
PA8
PA9
PA10
PA11
PA12
PA13
PA14
PA15
RC
Vin_Sense
Vout_Sense
LD_U
LD_D
LD_L
LD_R
USART_RX
USART_TX
RC
Vin_Sense
Vout_Sense
BK_Sense
BK_Drive
LD_U
LD_D
LD_L
LD_R
PC13
PC14
PC15
PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7
PB8
PB9
PB10
PB11
PB12
PB13
PB14
PB15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
GND
PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
PB0
PB1
PB2
PB10
PB11
NC
GND
PC13
PC14
PC15
PF0
PF1
NRST
5V_OUT
5V_IN
Reference: MB1142
Date: 30-May-14
Size: A4
Project: STM32F3348-DISCO
Title: STM32F334 DISCOVERY
Sheet: 1 of 5
Revision: B-01
Rev A-01 --> PCB label MB1142 A-01
Rev B-01 --> PCB label MB1142 B-01,
MOSFETs replaced by new family, several Resistors and Capacitors values.
Header 25
P1
6
U_ST_LINK
ST_LINK_V2.SCHDOC
UM1735
Electrical schematics
Electrical schematics
Figure 9. STM32F334 discovery
27/33
32
C13
R25
1
2
3
4
5
6
U5V
R9
R11
R10
R8
JP4
1K5
0
USB_DM
0
USB_DP
100K
VBAT
PC13
PC14
PC15
OSCIN
OSCOUT
NRST
VSSA
VDDA
PA0
PA1
PA2
R15
36K
R13
10K
100K
R14
100
JP2
USB_RENUMn
Not Fitted
STLINK_RX
1
2
3
4
5
6
7
8
9
10
11
12
+3V3_ST_LINK
U5V
1
+3V3_ST_LINK
SB16
SB14
TX
RX
T1
9013-SOT23
Close to JP
Not Fitted
AIN_1
OSC_IN
OSC_OUT
STM_RST
[NA]
+3V3_ST_LINK
C15
100nF
4K7
R27
4K7
R28
USB-MINI-typeB
VCC
DD+
ID
GND
SHELL
CN1
USB
USART_TX
USART_RX
SB6
R26
100K
8MHz
20pF X1
20pF
+3V3_ST_LINK1
2
C14
Board Ident: PC13=0
R22
T_JTCK
T_JTDO
T_JTDI
T_NRST
10K
SWIM_IN
SWIM
R16
SWIM_IN
SWIM_RST
SWIM_RST_IN
10K
36
35
34
33
32
31
30
29
28
27
26
25
C16
C10
LED_STLINK
COM
R5
R7
100
100
3
2
1
2
3
4
5
6
4
1
R1
R21
R19
R12
R4
22
22
22
22
BAT60JFILM
D1
T_SWO
T_NRST
VDD
C40
20pF
MCO
U5V
5V_IN
R2
0
+3V3_ST_LINK
D2
PWR_ENn
STPS1L30A
STPS1L30A
D3
Not Fitted
MCO
5 Volts From External
LD1
LED, red
JP3
Idd
100
R20
10K
S
DEFAULT
CN3
1uF
C3
1uF
C7
SB9
SB7
SB4
SB2
100nF
VI
EN
U1
Reference: MB1142
Date: 28-May-14
10nF
C9
BYPASS
Vout
SWD
TP1
TP2
SWDIO
SWCLK
+3V3_ST_LINK
SWCLK
SWDIO
NRST
SWO
1uF
C1
5
3
4
1uF
C11
5
Sheet: 2 of 5
C2
100nF
3V_OUT
3V
3 Volts Output
100nF
C8
+3V3_ST_LINK
ST-LINK Power
Revision: B-01
NC
PG
VO
LD39050PU33R
Project: STM32F3348-DISCO
Size: A4
STM_JTMS
STM_JTCK
LD3985M33R
INH
GND
Vin
U2
C4
100nF
3
1
Title: ST-LINK/V2-1 (SWD only)
G
6
1
C5
5 Volts Output
D
SB17
SB11
PA14
PA13
Jumpers ON --> DISCOVERY Selected
Jumpers OFF --> ST-LINK Selected
SB10
SB8
SB5
SB3
5V_OUT
STT7P2UH7
T2
SB1
AIN_1
T_JTMS
T_JTCK
[NA]
RC Must be very close to STM32F103 pin 29
Header 6
CN2
SWD
R3
10K
5 Volts From USB ST-LINK
R6
1K
3V
R18
100
R65
LD_BICOLOR_CMS
_Green
Red
LD2
100nF 100nF 100nF 100nF
C12
C6
+3V3_ST_LINK
T_SWDIO_IN
PWR_ENn
T_JTMS
T_JTCK
STM_JTMS
USB_DP
USB_DM
T_SWO
LED_STLINK
+3V3_ST_LINK
U3
STM32F103CBT6
+3V3_ST_LINK
+3V3_ST_LINK
VDD_2
VSS_2
JTMS/SWDIO
PA12
PA11
PA10
PA9
PA8
PB15
PB14
PB13
PB12
+3V3_ST_LINK
R23
JP1
Not Fitted
T_SWO
1
2
3
4
5V_IN
USB_RENUMn
STM_JTCK
R17
PA3
PA4
PA5
PA6
PA7
PB0
PB1
PB2/BOOT1
PB10
PB11
VSS_1
VDD_1
13
14
15
16
17
18
19
20
21
22
23
24
T_JRST
STLINK_TX
PWR_EXT
VDD_3
VSS_3
PB9
PB8
BOOT0
PB7
PB6
PB5
PB4/JNTRST
PB3/JTDO
PA15/JTDI
JTCK/SWCLK
48
47
46
45
44
43
42
41
40
39
38
37
2K7
4
R24
3
2
4
4K7
3
2
GND
2
1
2
5
6
T_NRST
GND
DocID025953 Rev 2
7
28/33
RESERVED
TCK/SWCLK
TMS/SWDIO
Electrical schematics
UM1735
Figure 10. ST-LINK/V2-1 (SWD only)
PF1
PF0
MCO
SB15
SB13
MCO
DocID025953 Rev 2
R29
0
R30
Not Fitted
220
X2
8MHz
C20
20pF
C21
20pF
BOOT0
C19
100nF
VDDA
C18
1uF
Ferrite
L1
C22
100nF
C24
100nF
C25
100nF
C17
100nF
VDD
All this block must be very close to the STM32F334
PF1-OSC_OUT
PF0-OSC_IN
SB12
Must be close to the Crystal
2
1
R31
BOOT0
510
B_USER
LD_U
LD_D
LD_L
LD_R
BK_Sense
BK_Drive
Vin_Sense
Vout_Sense
P2_Drive
RC
N2_Drive
N1_Drive
P1_Drive
PB6
PB7
PB8
PB9
PB0
PB12
PA1
PA3
PA11
PB14
PA10
PA9
PA8
PA0
PA1
PA2
PC13
PC14
PC15
PF0-OSC_IN
PF1-OSC_OUT
NRST
PA0
VDDA
PA0
PA1
PA2
NRST
VDD
PC13
PC14
PC15
PB7
BOOT0
PB8
PB9
PB7
VBAT
PC13
PC14
PC15
PF0/OSCIN
PF1/OSCOUT
NRST
VSSA
VDDA
PA0
PA1
PA2
Vin_Sense
Vout_Sense
P2_Drive
RC
N2_Drive
N1_Drive
P1_Drive
BK_Sense
BK_Drive
LD_U
LD_D
LD_L
LD_R
B_USER
PA3
PA3
PA4
PA4
PA5
PA5
PA6
PA6
PA7
PA7
PB0
PB0
1
2
3
4
5
6
7
8
9
10
11
12
VDD
PB8
PB9
PB11
PB11
PB10
PB10
PB2
PB2
PB1
PB1
SWCLK
SWDIO
SWO
USART_TX
USART_RX
PA13
PA12
PA11
PA10
PA9
PA8
PB15
PB14
PB13
PB12
Reference: MB1142
Date: 16-Apr-14
Size: A4
Project: STM32F3348-DISCO
Sheet: 3 of 5
Revision: B-01
SWCLK
SWDIO
SWO
USART_TX
USART_RX
PA13
PA12
PA11
PA10
PA9
PA8
PB15
PB14
PB13
PB12
VDD
U4
STM32F334C8T6
Title: STM32F3348CT6 MCU
PA14
PA13
PB3
PB3
PB4
36
35
34
33
32
31
30
29
28
27
26
25
VDD
VDD_2
VSS_2
PA13
PA12
PA11
PA10
PA9
PA8
PB15
PB14
PB13
PB12
PB6
PB6
PB5
PB5
PB4
PB4
PB3
PB3
PA15
PA15
PA14
PA14
48
47
46
45
44
43
42
41
40
39
38
37
VDD_3
VSS_3
PB9
PB8
BOOT0
PB7
PB6
PB5
PB4
PB3
PA15
PA14
PA3
PA4
PA5
PA6
PA7
PB0
PB1
PB2
PB10
PB11
VSS_1
VDD_1
13
14
15
16
17
18
19
20
21
22
23
24
SBx Must be very close to the STM32F334
UM1735
Electrical schematics
Figure 11. STM32F334C8T6 MCU
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32
VEXT
SB18
CN4
5V_OUT
LD_U R35
1K
LD_L R38
1K
LD_D R40
510
LD_R R36
330
LD_U
LD_L
LD_D
LD_R
C29
100nF
C28
47uF
LED, green
LED, blue
LD5
LED, orange
LD6
LED, red
LD4
LD3
PB12
BK_Drive
10
R34
L
G
R33
10K
3
D
S
R39
1
33R
R37
R
82μH 10%
L2
T3
STT5N2VH5
LEDs
D
U
4
6
5
2
1
D4
STPS1L40A
C26
1nF
LPB_10_10
LPB
White
P4
P3
Wired on Solder Side
PB0
LED LE-CWC12100_[D]_1W
With LPB1
LD7
BK_Sense
SB19
C27
1uF
LPB1
PA0
B_USER
NRST
SB21
100nF
C31
SB20
C30
100nF
10K
R41
Reference: MB1142
Date: 14-May-14
Size: A4
Project: STM32F3348-DISCO
Title: LED BUCK converter
RESET Button
NRST
B_USER
USER & WAKE-UP Button
VDD
4
1
SW-PUSH-CMS_BLUE
B1
Sheet: 4 of 5
Revision: B-01
R42
[NA]
VDD
R43
10K
3
2
4
1
DocID025953 Rev 2
3
2
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SW-PUSH-CMS_BLACK
B2
LED BUCK converter
Electrical schematics
UM1735
Figure 12. LED buck converter
Vin
CN5
PA8
P1_Drive
R45
6.8K 0.1% C32
22nF_X7R_10%_0603
Vin_Sense
PA1
270R
R61
270R
R55
C38
47uF
1
R59
10K
1
G
G
C36
100nF
S
D
S
D
T8
BC807
1
1
PA9
10R
R56
3
C33
100nF
S
R62
10K
3
4
6
5
2
1
SB22
D5
BAT54FILM
1
2
5
6
4
TP4
L3
82μH 10%
CN6
STT4P3LLH6
STT4P3LLH6
T5
T11
STT5N2VH5
STT5N2VH5
T12
T4
PB14
RC
4
6
5
2
1
C34
100nF
3
R63
10K
10R
R57
47R
10R
R49
D7
BAT54FILM
R50
D8
SMAJ15A
PA10
N2_Drive
T13
NDS7002A
1
T9
BC807
1 T7
BC817
T15
NDS7002A
TP3
C23
10nF_X7R_10%_0805
GND
R32
15K_1%_0805
3
Not Fitted
1
2
5
6
4
RC Low Pass Filter
10R
R47
47R
R48
3
SMAJ15A
D6
T6
BC817
N1_Drive
T14
NDS7002A
T10
NDS7002A
R53
1K
3
2
2
3
2
1
1
R51
27K 0.1%
3
2
3
2
nc
2
2
1
1
S
D
D
G
G
G
G
D
D
S
DocID025953 Rev 2
S
3
nc
2
3
2
2
3
S
D
3
S
D
2
3
2
BUCK/BOOST Converter
R54
1K
G
G
1
1
Not Fitted
270R
R64
270R
R58
C39
47uF
PA11
Reference: MB1142
Date: 30-May-14
Size: A4
Project: STM32F3348-DISCO
C35
6.8nF
R46
3K3_0.1%_0805
R52
13K3_0.1%_0805
Sheet: 5 of 5
Revision: B-01
Not Fitted
P2_Drive
R44
1
Title: BUCK / BOOST CONVERTER
R60
10K
C37
100nF
PA3
Vout_Sense
Vout
CN7
UM1735
Electrical schematics
Figure 13. Buck/boost converter
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Revision history
7
UM1735
Revision history
Table 6. Document revision history
Date
Revision
19-Jun-2014
1
Initial release
2
Change of STM32F3x4 to STM32F334 in Introduction.
mbed-enabled logo added on the cover page.
Added mbed-enabled in Section 3: Features.
Added Section 2.1: Product marking.
Text change in Section 2.2: Order code.
Remove Windows Vista in Section 4.1.1: Drivers.
SB14 and SB16 default position update in Table 4:
Solder bridges
Added Section 4.1.3: VCP configuration
01-Feb-2016
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Changes
DocID025953 Rev 2
UM1735
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