ST UM1472 User manual

January 2012 Doc ID 022256 Rev 2 1/38
UM1472
User Manual
STM32F4DISCOVERY
STM32F4 high-performance discovery board
Introduction
The STM32F4DISCOVERY helps you to discover the STM32F4 high-performance features
and to develop your applications. It is based on an STM32F407VGT6 and includes an
ST-LINK/V2 embedded debug tool interface, ST MEMS digital accelerometer, ST MEMS
digital microphone, audio DAC with integrated class D speaker driver, LEDs, pushbuttons
and a USB OTG micro-AB connector.
Figure 1. STM32F4DISCOVERY
www.st.com

Contents STM32F4DISCOVERY
2/38 Doc ID 022256 Rev 2
Contents
1Conventions................................................5
2Quickstart.................................................6
2.1 Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 System requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.3 Development toolchain supporting the STM32F4DISCOVERY . . . . . . . . . 6
2.4 Order code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3Features...................................................7
4Hardwareandlayout.........................................8
4.1 STM32F407VGT6 microcontroller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.2 Embedded ST-LINK/V2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.2.1 Using ST-LINK/V2 to program/debug the STM32F4 on board . . . . . . . . 14
4.2.2 Using ST-LINK/V2 to program/debug an external STM32 application . . 15
4.3 Power supply and power selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.4 LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.5 Pushbuttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.6 On board audio capability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.7 USB OTG supported . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.8 Motion sensor (ST MEMS LIS302DL) . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.9 JP1 (Idd) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.10 OSC clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.10.1 OSC clock supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.10.2 OSC 32 KHz clock supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.11 Solder bridges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.12 Extension connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5Mechanicaldrawing........................................30
6Electricalschematics.......................................31
7Revisionhistory...........................................37

STM32F4DISCOVERY List of tables
Doc ID 022256 Rev 2 3/38
List of tables
Table 1. ON/OFF conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Table 2. Jumper states . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Table 3. Debug connector CN2 (SWD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Table 4. Solder bridges. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Table 5. MCU pin description versus board function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Table 6. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

List of figures STM32F4DISCOVERY
4/38 Doc ID 022256 Rev 2
List of figures
Figure 1. STM32F4DISCOVERY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Figure 2. Hardware block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 3. Top layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 4. Bottom layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 5. STM32F407VGT6 package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 6. STM32F407VGT6 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 7. Typical configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 8. STM32F4DISCOVERY connections image . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 9. ST-Link connections image . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 10. STM32F4DISCOVERY mechanical drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Figure 11. STM32F4DISCOVERY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Figure 12. ST-LINK/V2 (SWD only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Figure 13. MCU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Figure 14. Audio. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Figure 15. USB_OTG_FS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Figure 16. Peripherals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

STM32F4DISCOVERY Conventions
Doc ID 022256 Rev 2 5/38
1 Conventions
Ta bl e 1 provides the definition of some conventions used in the present document.
Table 1. ON/OFF conventions
Convention Definition
Jumper JP1 ON Jumper fitted
Jumper JP1 OFF Jumper not fitted
Solder bridge SBx ON SBx connections closed by solder
Solder bridge SBx OFF SBx connections left open

Quick start STM32F4DISCOVERY
6/38 Doc ID 022256 Rev 2
2 Quick start
The STM32F4DISCOVERY is a low-cost and easy-to-use development kit to quickly
evaluate and start a development with an STM32F4 high-performance microcontroller.
Before installing and using the product, please accept the Evaluation Product License
Agreement from www.st.com/stm32f4-discovery.
For more information on the STM32F4DISCOVERY and for demonstration software, visit
www.st.com/stm32f4-discovery.
2.1 Getting started
Follow the sequence below to configure the STM32F4DISCOVERY board and launch the
DISCOVER application:
1. Check jumper position on the board, JP1 on, CN3 on (DISCOVERY selected).
2. Connect the STM32F4DISCOVERY board to a PC with a USB cable ‘type A to mini-B’
through USB connector CN1 to power the board. Red LED LD2 (PWR) then lights up.
3. Four LEDs between B1 and B2 buttons are blinking.
4. Press user button B1 to enable the ST MEMS sensor, move the board and observe the
four LEDs blinking according to the motion direction and speed. (If you connect a
second USB cable ‘type A to micro-B’ between PC and CN5 connector then the board
is recognized as standard mouse and its motion will also control the PC cursor).
5. To study or modify the DISCOVER project related to this demo, visit
www.st.com/stm32f4-discovery and follow the tutorial.
6. Discover the STM32F4 features, download and execute programs proposed in the list
of projects.
7. Develop your own application using available examples.
2.2 System requirements
●Windows PC (XP, Vista, 7)
●USB type A to Mini-B USB cable
2.3 Development toolchain supporting the STM32F4DISCOVERY
●Altium, TASKING™ VX-Toolset
●Atollic, TrueSTUDIO
●IAR, EWARM
●Keil™, MDK-ARM
2.4 Order code
To o r de r th e S T M3 2 F 4 h i gh - p e rfo r m a n c e d i s co ve r y b o a r d , u s e t h e o r d e r c o d e
STM32F4DISCOVERY.

STM32F4DISCOVERY Features
Doc ID 022256 Rev 2 7/38
3 Features
The STM32F4DISCOVERY offers the following features:
●STM32F407VGT6 microcontroller featuring 1 MB of Flash memory, 192 KB of RAM in
an LQFP100 package
●On-board ST-LINK/V2 with selection mode switch to use the kit as a standalone
ST-LINK/V2 (with SWD connector for programming and debugging)
●Board power supply: through USB bus or from an external 5V supply voltage
●External application power supply: 3V and 5V
●LIS302DL, ST MEMS motion sensor, 3-axis digital output accelerometer
●MP45DT02, ST MEMS audio sensor, omnidirectional digital microphone
●CS43L22, audio DAC with integrated class D speaker driver
●Eight LEDs:
–LD1(red/green)forUSBcommunication
–LD2(red)for3.3Vpoweron
–FouruserLEDs,LD3(orange),LD4(green),LD5(red)andLD6(blue)
–2USBOTGLEDsLD7(green)VBusandLD8(red)over-current
●Tw o p u s h bu tt o n s ( u s e r a n d r e s e t )
●USB OTG with micro-AB connector
●Extension header for LQFP100 I/Os for quick connection to prototyping board and easy
probing

Hardware and layout STM32F4DISCOVERY
8/38 Doc ID 022256 Rev 2
4 Hardware and layout
The STM32F4DISCOVERY is designed around the STM32F407VGT6 microcontroller in a
100-pin LQFP package.
Figure 2 illustrates the connections between the STM32F407VGT6 and its peripherals (ST-
LINK/V2, pushbutton, LED, Audio DAC, USB, ST MEMS accelerometer, ST MEMS
microphone, and connectors).
Figure 3 and Figure 4 help you to locate these features on the STM32F4DISCOVERY.
Figure 2. Hardware block diagram
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STM32F4DISCOVERY Hardware and layout
Doc ID 022256 Rev 2 9/38
Figure 3. Top layout
Note: Pin 1 of CN2, CN3, JP1, P1 and P2 connectors are identified by a square.
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Hardware and layout STM32F4DISCOVERY
10/38 Doc ID 022256 Rev 2
Figure 4. Bottom layout
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STM32F4DISCOVERY Hardware and layout
Doc ID 022256 Rev 2 11/38
4.1 STM32F407VGT6 microcontroller
This ARM Cortex-M4 32-bit MCU with FPU has 210 DMIPS, up to 1 MB Flash/192+4 KB
RAM, USB OTG HS/FS, Ethernet, 17 TIMs, 3 ADCs, 15 comm. interfaces and a camera.
Figure 5. STM32F407VGT6 package
This device provides the following benefits.
●168 MHz/210 DMIPS Cortex-M4 with single cycle DSP MAC and floating point unit
providing:
Boosted execution of control algorithms
More features possible for your applications
Ease of use
Better code efficiency
Faster time to market
Elimination of scaling and saturation
Easier support for meta-language tools
●Designed for high performance and ultra fast data transfers; ART Accelerator, 32-bit, 7-
layer AHB bus matrix with 7 masters and 8 slaves including 2 blocks of SRAM, Multi
DMA controllers: 2 general purpose, 1 for USB HS, 1 for Ethernet, One SRAM block
dedicated to the core, providing performance equivalent to 0-wait execution from Flash
Concurrent execution and data transfers and simplified resource allocation
●Outstanding power efficiency; Ultra-low dynamic power, RTC <1 µA typical in VBAT
mode, 3.6 V down to 1.7 V VDD, Voltage regulator with power scaling capability,
providing extra flexibility to reduce power consumption for applications requiring both
high processing and low power performance when running at low voltage or on a
rechargeable battery
●Maximum integration: Up to 1 Mbyte of on-chip Flash memory, 192 Kbytes of SRAM,
reset circuit, internal RCs, PLLs, WLCSP package available, providing more features in
space constrained applications
●Superior and innovative peripherals providing new possibilities to connect and
communicate high speed data and more precision due to high resolution
●Extensive tools and software solutions providing a wide choice within the STM32
ecosystem to develop your applications.
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Hardware and layout STM32F4DISCOVERY
12/38 Doc ID 022256 Rev 2
Figure 6. STM32F407VGT6 block diagram
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STM32F4DISCOVERY Hardware and layout
Doc ID 022256 Rev 2 13/38
4.2 Embedded ST-LINK/V2
The ST-LINK/V2 programming and debugging tool is integrated on the
STM32F4DISCOVERY. The embedded ST-LINK/V2 can be used in 2 different ways
according to the jumper states (see Ta bl e 2 ):
●Program/debug the MCU on board,
●Program/debug an MCU in an external application board using a cable connected to
SWD connector CN2.
The embedded ST-LINK/V2 supports only SWD for STM32 devices. For information about
debugging and programming features refer to user manual UM1075 (ST-LINK/V2 in-circuit
debugger/programmer for STM8 and STM32) which describes in detail all the ST-LINK/V2
features.
Figure 7. Typical configuration
Table 2. Jumper states
Jumper state Description
Both CN3 jumpers ON ST-LINK/V2 functions enabled for on board programming (default)
Both CN3 jumpers OFF ST-LINK/V2 functions enabled for application through external CN2
connector (SWD supported)
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Hardware and layout STM32F4DISCOVERY
14/38 Doc ID 022256 Rev 2
4.2.1 Using ST-LINK/V2 to program/debug the STM32F4 on board
To p r o gr a m t h e S T M 3 2 F4 o n b o a rd , s i m p l y p l u g i n t he t w o j u m p er s o n C N 3, a s s h ow n i n
Figure 8 in red, but do not use the CN2 connector as that could disturb communication with
the STM32F407VGT6 of the STM32F4DISCOVERY.
Figure 8. STM32F4DISCOVERY connections image

STM32F4DISCOVERY Hardware and layout
Doc ID 022256 Rev 2 15/38
4.2.2 Using ST-LINK/V2 to program/debug an external STM32 application
It is very easy to use the ST-LINK/V2 to program the STM32 on an external application.
Simply remove the 2 jumpers from CN3 as shown in Figure 9, and connect your application
to the CN2 debug connector according to Ta bl e 3 .
Note: SB11 must be OFF if you use CN2 pin 5 in your external application.
Figure 9. ST-Link connections image
Table 3. Debug connector CN2 (SWD)
Pin CN2 Designation
1 VDD_TARGET VDD from application
2 SWCLK SWD clock
3 GND Ground
4 SWDIO SWD data input/output
5 NRST RESET of target MCU
6 SWO Reserved

Hardware and layout STM32F4DISCOVERY
16/38 Doc ID 022256 Rev 2
4.3 Power supply and power selection
The power supply is provided either by the host PC through the USB cable, or by an external
5V power supply.
The D1 and D2 diodes protect the 5V and 3V pins from external power supplies:
●5V and 3V can be used as output power supplies when another application board is
connected to pins P1 and P2.
In this case, the 5V and 3V pins deliver a 5V or 3V power supply and power
consumption must be lower than 100 mA.
●5V can also be used as input power supplies e.g. when the USB connector is not
connected to the PC.
In this case, the STM32F4DISCOVERY board must be powered by a power supply unit
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.
4.4 LEDs
●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.
●LD2 PWR: red LED indicates that the board is powered.
●User LD3: orange LED is a user LED connected to the I/O PD13 of the
STM32F407VGT6.
●User LD4: green LED is a user LED connected to the I/O PD12 of the
STM32F407VGT6.
●User LD5: red LED is a user LED connected to the I/O PD14 of the STM32F407VGT6.
●User LD6: blue LED is a user LED connected to the I/O PD15 of the STM32F407VGT6.
●USB LD7: green LED indicates when VBUS is present on CN5 and is connected to PA9
of the STM32F407VGT6.
●USB LD8: red LED indicates an overcurrent from VBUS of CN5 and is connected to the
I/O PD5 of the STM32F407VGT6.
4.5 Pushbuttons
●B1 USER: User and Wake-Up button connected to the I/O PA0 of the
STM32F407VGT6.
●B2 RESET: Pushbutton connected to NRST is used to RESET the STM32F407VGT6.

STM32F4DISCOVERY Hardware and layout
Doc ID 022256 Rev 2 17/38
4.6 On board audio capability
The STM32F4 uses an audio DAC (CS43L22) to output sounds through the audio mini jack
connector.
The STM32F4 controls the audio DAC through the I2C interface and processes digital
signals through I2S connection or analog input signal.
●The sound can come independently from different inputs:
–STMEMSmicrophone(MP45DT02):digitalusingPDMprotocoloranalogwhen
using the low pass filter.
–USBconnector:fromexternalmassstoragesuchasaUSBkey,USBHDD,andso
on.
–InternalmemoryoftheSTM32F4.
●The sound can be output in different ways through audio DAC:
–UsingI2Sprotocol
–UsingtheSTM32F4DACtoanaloginputAIN1xoftheCS43L22
–UsingthemicrophoneoutputdirectlyviaalowpassfiltertoanaloginputAIN4xof
the CS43L22
4.7 USB OTG supported
The STM32F4 is used to drive only USB OTG full speed on this board. The USB micro-AB
connector (CN5) allows the user to connect a host or device component, such as a USB key,
mouse, and so on.
Tw o L E Ds a r e d e d i c a te d t o t h i s m o d ul e :
●LD7 (green LED) indicates when VBUS is active
●LD8 (red LED) indicates an overcurrent from connected device
4.8 Motion sensor (ST MEMS LIS302DL)
The LIS302DL is an ultra compact low-power three-axis linear accelerometer.
It includes a sensing element and an IC interface able to provide the measured acceleration
to the external world through I2C/SPI serial interface.
The LIS302DL has dynamically user selectable full scales of ±2g/±8g and it is capable of
measuring acceleration with an output data rate of 100 Hz or 400 Hz.
The STM32F4 controls this motion sensor through the SPI interface.
4.9 JP1 (Idd)
Jumper JP1, labeled Idd, allows the consumption of STM32F407VGT6 to be measured by
removing the jumper and connecting an ammeter.
●Jumper on: STM32F407VGT6 is powered (default).
●Jumper off: an ammeter must be connected to measure the STM32F407VGT6 current,
(if there is no ammeter, the STM32F407VGT6 is not powered).

Hardware and layout STM32F4DISCOVERY
18/38 Doc ID 022256 Rev 2
4.10 OSC clock
4.10.1 OSC clock supply
If PH0 and PH1 are only used as GPIOs instead of as a clock, then SB13 and SB14 are
closed and R24, R25 and R68 are removed.
●MCO from ST-LINK. From MCO of the STM32F103. This frequency cannot be
changed, it is fixed at 8 MHz and connected to PH0-OSC_IN of the STM32F407VGT6.
Configuration needed:
–SB13,SB14OPEN
–R25
(a) removed
–R68
(a) soldered
●Oscillator onboard. From X2 crystal. For typical frequencies and its capacitors and
resistors, please refer to the STM32F407VGT6 Datasheet. Configuration needed:
–SB13,SB14OPEN
–R25
(a) soldered
–R68
(a) removed
●Oscillator from external PH0. From external oscillator through pin 7 of the P2
connector. Configuration needed:
–SB13closed
–SB14closed
–R25andR68removed
4.10.2 OSC 32 KHz clock supply
If PC14 and PC15 are only used as GPIOs instead of as a clock, then SB15 and SB16 are
closed, and R21 and R22 are removed.
●Oscillator onboard. From X1 Crystal (not provided). Configuration needed:
–SB15,SB16OPEN
–C16,C27,R21andR22soldered.
●Oscillator from external PC14. From external oscillator trough the pin 9 of P2
connector. Configuration needed:
–SB16closed
–SB15closed
–R21andR22removed
a. As the frequency supplied by X2 is the same as MCO (8 MHz) R25 and R68 are soldered.

STM32F4DISCOVERY Hardware and layout
Doc ID 022256 Rev 2 19/38
4.11 Solder bridges
Table 4. Solder bridges
Bridge State(1) Description
SB13,14 (X2 crystal)(2) OFF X2, C14, C15, R24 and R25 provide a clock.
PH0, PH1 are disconnected from P2.
ON PH0, PH1 are connected to P2 (R24, R25 and R68 must not be fitted).
SB3,5,7,9 (Default) ON Reserved,donotmodify.
SB2,4,6,8 (Reserved) OFF Reserved, do not modify.
SB15,16
(X3 crystal)
OFF X3, C16, C27, R21 and R22 deliver a 32 KHz clock.
PC14, PC15 are not connected to P2.
ON PC14, PC15 are only connected to P2. Remove only R21, R22
SB1
(B2-RESET)
ON B2pushbuttonisconnectedtotheNRSTpinoftheSTM32F407VGT6MCU.
OFF B2 pushbutton is not connected the NRST pin of the STM32F407VGT6 MCU.
SB20
(B1-USER)
ON B1pushbuttonisconnectedtoPA0.
OFF B1 pushbutton is not connected to PA0.
SB17
(VDD powered from
3V)
OFF VDD is not powered from 3V, depends on JP1 jumper.
ON VDD is permanently powered from 3V, JP1 jumper has no effect.
SB11 (NRST)
ON NRST signal of the CN2 connector is connected to the NRST pin of the
STM32F407VGT6 MCU.
OFF NRST signal of the CN2 connector is not connected to the NRST pin of the
STM32F407VGT6 MCU.
SB12 (SWO) ON SWOsignaloftheCN2connectorisconnectedtoPB3.
OFF SWO signal is not connected.
SB10 (STM_RST) OFF NoincidenceonSTM32F103C8T6(ST-LINK/V2)NRSTsignal.
ON STM32F103C8T6 (ST-LINK/V2) NRST signal is connected to GND.
SB18 (BOOT0)
ON BOOT0 signal of the STM32F407VGT6 MCU is held low through a 510 ohm pull-
down resistor.
OFF BOOT0 signal of the STM32F407VGT6 MCU is held high through a 10 Kohm
pull-up resistor.
SB19 (BOOT1)
OFF The BOOT1 signal of the STM32F407VGT6 MCU is held high through a
10 Kohm pull-up resistor.
ON The BOOT1 signal of the STM32F407VGT6 MCU is held low through a 510 ohm
pull-down resistor.
1. Default SBx state is shown in bold.
2. SB13 and SB14 are OFF to allow the user to choose between MCO and X2 crystal for clock source.

Hardware and layout STM32F4DISCOVERY
20/38 Doc ID 022256 Rev 2
4.12 Extension connectors
The male headers P1 and P2 can connect the STM32F4DISCOVERY to a standard
prototyping/wrapping board. STM32F407VGT6 GPI/Os are available on these connectors.
P1 and P2 can also be probed by an oscilloscope, logical analyzer or voltmeter.
Table 5. MCU pin description versus board function (page 1 of 10)
MCU pin Board function
Main
function
Alternate
functions
LQFP100
CS43L22
MP45DT02
LIS302DL
Pushbutton
LED
SWD
USB
OSC
Free I/O
Power supply
CN5 CN2
P1 P2
BOOT0 VPP 94 21
NRST 14
RESET
NRST
56
PA 0 -
WKUP
USART2_CTS/
USART4_TX/
ETH_MII_CRS/
TIM2_CH1_ETR/
TIM5_CH1/
TIM8_ETR/
ADC123_IN0/
WKUP
23
USER
12
PA 1
USART2_RTS/
USART4_RX/
ETH_RMII_REF_CLK/
ETH_MII_RX_CLK/
TIM5_CH2/
TIMM2_CH2/
ADC123_IN1
24 11
PA 2
USART2_TX/
TIM5_CH3/
TIM9_CH1/
TIM2_CH3/
ETH_MDIO/
ADC123_IN2
25
14
PA 3
USART2_RX/
TIM5_CH4/
TIM9_CH2/
TIM2_CH4/
OTG_HS_ULPI_D0/
ETH_MII_COL/
ADC123_IN3
26 13