ST UM2140 User manual

December 2021 UM2140 Rev 3 1/48
1
UM2140
User manual
Discovery kit with STM32F723IE MCU
Introduction
With the STM32F723 Discovery kit (32F723EDISCOVERY), users develop applications
easily on the STM32F7 Series high-performance microcontrollers based on Arm®
Cortex®-M7 core. The Discovery kit combines the STM32F723 features with 240x240 pixel
LCD with touch panel, SAI audio codec, MEMS microphones, USBs OTG HS and OTG FS,
Quad-SPI NOR Flash memory, and microSD™card connector.
An embedded ST-LINK/V2-1 debugger/programmer is included. Specialized add-on boards
can be connected through the ARDUINO®Uno V3, Pmod™, or STMod+ expansion
connectors.
Pictures are not contractual.
Figure 1. 32F723EDISCOVERY (Top view) Figure 2. 32F723EDISCOVERY (Bottom view)
www.st.com

Contents UM2140
2/48 UM2140 Rev 3
Contents
1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1 Codification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3 Development environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1 System requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.2 Development toolchains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4 Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5 Hardware layout and configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.1 32F723EDISCOVERY Discovery kit layout . . . . . . . . . . . . . . . . . . . . . . . .11
5.2 32F723EDISCOVERY Discovery kit mechanical drawing . . . . . . . . . . . . 13
5.3 Embedded ST-LINK/V2-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.3.1 Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.3.2 ST-LINK/V2-1 firmware upgrade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.4 Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.4.1 Supplying the board through the ST-LINK USB port (default setting) . . 15
5.4.2 Supplying the board through a charger connected to ST-LINK . . . . . . . 16
5.4.3 Supplying the board from E5V (On CN3 or CN12 connector) . . . . . . . . 17
5.4.4 Supplying the board from an external power supply through USB HS . 18
5.4.5 Supplying the board from an external power supply through USB FS . 18
5.5 Programming/debugging when the power supply is not from
ST-LINK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.6 Clock sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.7 Reset sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.8 Audio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.9 USB OTG HS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.10 USB OTG FS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.11 PSRAM memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.12 Quad-SPI NOR Flash memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.13 Virtual COM port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

UM2140 Rev 3 3/48
UM2140 Contents
4
5.14 TFT LCD 240x240 pixels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.15 Capacitive control touch panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.16 Buttons and LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6 Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
6.1 Wi-Fi® ESP-01 compatible connector . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
6.2 ARDUINO®Uno V3 compatible connectors . . . . . . . . . . . . . . . . . . . . . . . 23
6.3 P2 Pmod™and P1 STMod+ connectors . . . . . . . . . . . . . . . . . . . . . . . . . 24
6.3.1 P2 Pmod™connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6.3.2 P1 STMod+ connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
6.4 CN9 TAG connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
6.5 CN19 USB OTG HS Micro-AB connector . . . . . . . . . . . . . . . . . . . . . . . . 28
6.6 CN18 USB OTG FS Micro-AB connector . . . . . . . . . . . . . . . . . . . . . . . . . 28
6.7 LCD connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
6.8 Control Touch Panel (CTP) connector . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
6.9 CN1 ST-LINK/V2-1 USB Micro-B connector . . . . . . . . . . . . . . . . . . . . . . 31
6.10 Audio stereo speakers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
6.11 Audio line connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
6.11.1 Audio line output (green jack) connector . . . . . . . . . . . . . . . . . . . . . . . . 32
6.11.2 Audio line input (blue jack) connector . . . . . . . . . . . . . . . . . . . . . . . . . . 32
7 32F723EDISCOVERY board information . . . . . . . . . . . . . . . . . . . . . . . . 33
7.1 Product marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
7.2 32F723EDISCOVERY product history . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
7.2.1 Product identification 32F723EDISCO/ . . . . . . . . . . . . . . . . . . . . . . . . . 33
7.2.2 Product identification DK32F723E$AU1 . . . . . . . . . . . . . . . . . . . . . . . . 33
7.3 Board revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
7.3.1 Board MB1260 revision D-01 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
7.3.2 Board MB1260 revision D-03 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
7.3.3 Board MB1280 revision A-03 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
7.3.4 Board MB1280 revision B-01 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
7.3.5 Board MB1280 revision C-01 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Appendix A 32F723EDISCOVERY Discovery board I/O assignment . . . . . . . . . 35
Appendix B Pmod™ and STMod+ schematic table. . . . . . . . . . . . . . . . . . . . . . . 40

Contents UM2140
4/48 UM2140 Rev 3
Appendix C Fanout board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
C.1 MikroElektronika mikroBUS™ compatible connector
(Fanout CN10 and CN11) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
C.2 ESP-01 Wi-Fi®board compatible connector. . . . . . . . . . . . . . . . . . . . . . . 43
C.3 Compatible connectors for the Grove boards . . . . . . . . . . . . . . . . . . . . . . 44
C.3.1 Compatible connector for I2C Grove boards (Fanout CN3) . . . . . . . . . . 44
C.3.2 Compatible connector for UART Grove boards (Fanout CN2) . . . . . . . . 44
Appendix D Federal Communications Commission (FCC)
and Industry Canada (IC) Compliance Statements. . . . . . . . . . . . . 45
D.1 FCC Compliance Statement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
D.1.1 Part 15.19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
D.1.2 Part 15.105 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
D.1.3 Part 15.21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
D.2 IC Compliance Statement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
D.2.1 Compliance Statement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
D.3 Déclaration de conformité . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Appendix E CISPR32 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
E.1 Warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

UM2140 Rev 3 5/48
UM2140 List of tables
5
List of tables
Table 1. Ordering Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 2. Codification explanation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 3. ON/OFF conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 4. 32F723EDISCOVERY board power configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Table 5. Control port assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Table 6. CN14 Wi-Fi®module connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Table 7. GPIO assignment for ARDUINO®pins. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Table 8. GPIO assignment for Pmod™ pins. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Table 9. Pmod™: SPI or UART configuration selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Table 10. GPIO assignment for STMod+ pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Table 11. STMod+: SPI/UART configuration selection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Table 12. CN19 USB OTG HS Micro-AB connector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Table 13. CN18 USB OTG FS Micro-AB connector (Front view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Table 14. Pin description of the CN17 LCD connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Table 15. Pin description of the CN16 CTP connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Table 16. CN1 USB Micro-B connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Table 17. CN5 audio line output connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Table 18. CN4 audio line input connector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Table 19. I/O assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Table 20. STMod+ connector signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Table 21. Description of the mikroBUS™ connector pins. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Table 22. Description of the ESP-01 Wi-Fi®board connector pins . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Table 23. Description of the I2C Grove board connector pins (CN3) . . . . . . . . . . . . . . . . . . . . . . . . . 44
Table 24. Description of the UART Grove board connector pins (CN2) . . . . . . . . . . . . . . . . . . . . . . . 44
Table 25. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

List of figures UM2140
6/48 UM2140 Rev 3
List of figures
Figure 1. 32F723EDISCOVERY (Top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Figure 2. 32F723EDISCOVERY (Bottom view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Figure 3. Hardware block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 4. 32F723EDISCOVERY top layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 5. 32F723EDISCOVERY bottom layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 6. 32F723EDISCOVERY mechanical drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 7. USB composite device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 8. CN8 ST-LINK connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 9. CN8 USB_STLINK connector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 10. CN8 external 5 V supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 11. CN8 external USB_HS supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 12. CN8 external USB_FS supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 13. CN14 Wi-Fi®connector (Front view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 14. P2 Pmod™connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 15. P1 STMod+ connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Figure 16. CN9 TAG connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 17. CN19 USB OTG HS Micro-AB connector (Front view). . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 18. CN18 USB OTG FS Micro-AB connector (Front view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 19. CN17 LCD connector (Front view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 20. CN16 CTP connector (Front view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Figure 21. CN1 USB Micro-B connector (front view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Figure 22. Mechanical drawing of the audio line connector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Figure 23. STMod+ Fanout module plugged into the P1 connector . . . . . . . . . . . . . . . . . . . . . . . . . . 42

UM2140 Rev 3 7/48
UM2140 Features
47
1 Features
•STM32F723IEK6 microcontroller with 512 Kbytes of Flash memory and 176+16 Kbytes
of SRAM, in a BGA176 package
•240x240-pixel TFT LCD with a parallel interface and capacitive touch panel
•USB OTG HS and OTG FS
•SAI audio codec
•Four digital ST-MEMS microphones
•8-Mbit 16-bit wide PSRAM
•512-Mbit Quad-SPI NOR Flash memory
•User and reset push-buttons
•Board connectors:
–ESP-01Wi.Fi
®module connector
– Two user USB with Micro-AB
– Jack for audio line with stereo input and output
– Stereo speaker output
–Pmod
™connector
– STMod+ connector to embedded fanout daughterboard compatible with
MikroElektronika mikroBUS™adapter Click boards™, ESP-01, and Seeed
Studio™Grove modules. Provision for headers for direct breadboard plug-in
– ARDUINO®Uno V3 expansion connectors
– 3.3 or 5.0 V power supply output for external applications
•Flexible power-supply options: ST-LINK USB VBUS, user USB HS and FS connectors,
or external sources
•Comprehensive free software libraries and examples available with the STM32Cube
MCU Package
•On-board ST-LINK/V2-1 debugger/programmer with USB re-enumeration capability:
mass storage, Virtual COM port, and debug port
•Support of a wide choice of Integrated Development Environments (IDEs) including
IAR Embedded Workbench®, MDK-ARM, and STM32CubeIDE
2 Ordering information
To order the 32F723EDISCOVERY Discovery kit, refer to Ta bl e 1. Additional information is available
from the datasheet and reference manual of the target microcontroller.
Table 1. Ordering Information
Order code Board reference Target STM32
STM32F723E-DISCO MB1260(1)
MB1280(2)
1. Mother board
2. Fanout daughterboard
STM32F723IEK6

Ordering information UM2140
8/48 UM2140 Rev 3
2.1 Codification
The meaning of the codification is explained in Table 2.
Table 2. Codification explanation
STM32F7XXY-DISCO Description Example:
STM32F723E-DISCO
STM32F7 MCU series in
STM32 32-bit Arm Cortex MCUs SRM32F7 Series
XX MCU product line in the series STM32F723
YSTM32 Flash memory size:
E for 512 Kbytes 512 Kbytes
DISCO Discovery kit Discovery kit

UM2140 Rev 3 9/48
UM2140 Development environment
47
3 Development environment
The 32F723EDISCOVERY Discovery kit runs with the STM32F413ZHT6 32-bit
microcontroller based on the Arm®(a) Cortex®-M7 core.
3.1 System requirements
•Multi-OS support: Windows®10, Linux®(b) 64-bit, or macOS®(c)(d)
•USB Type-A or USB Type-C®to Micro-B cable
3.2 Development toolchains
•IAR Systems®- IAR Embedded Workbench®(e)
•Keil®- MDK-ARM(e)
•STMicroelectronics - STM32CubeIDE
4 Conventions
Table 3 defines some conventions used in the present document.
a. Arm is a registered trademark of Arm Limited (or its subsidiaries) in the US and/or elsewhere.
b. Linux is a registered trademark of Linus Torvalds.
c. macOS is a trademark of Apple Inc. registered in the U.S. and other countries.
d. All other trademarks are the property of their respective owners.
e. On Windows®only.
Table 3. ON/OFF conventions
Convention Definition
Jumper JPx ON Jumper fitted
Jumper JPx OFF Jumper not fitted
Jumper JPx [1-2] Jumper fitted between Pin 1 and Pin 2
Solder bridge SBx ON SBx connections closed by solder
Solder bridge SBx OFF SBx connections left open
Resistor Rx ON Resistor soldered
Resistor Rx OFF Resistor not soldered

Hardware layout and configuration UM2140
10/48 UM2140 Rev 3
5 Hardware layout and configuration
The 32F723EDISCOVERY Discovery kit is designed around the STM32F723IEK6 (176-pin
in UFBGA package). The hardware block diagram shown in Figure 3 illustrates the
connection between STM32F723IEK6 and peripherals (PSRAM, Quad-SPI Flash memory,
LCD connector, USB OTG HS and FS connectors, USART, Audio, ARDUINO®Uno V3,
Pmod™and STMod+ shields, and embedded ST-LINK). Figure 4 and Figure 5 help users to
locate these features on the 32F723EDISCOVERY board. The mechanical dimensions of
the 32F723EDISCOVERY board are shown in Figure 6.
Figure 3. Hardware block diagram
1. Dotted lines identify the shared signals.
MSv44313V2
3.3 V power supply
LEDs, push-buttons,
and wake-up circuitry
USB Micro-AB connector
USB Micro-AB connector
Wi-Fi
®
module connector
GPIOs
OTG HS
OTG FS
UART
VCP UART
SWD
GPIOs
GPIOs
I
2
C
GPIOs
GPIOs
FMC
address
FMC data
GPIOs
HSI
RTC
I
2
C
SAI
QSPI
Audio codec
Pmod™ module
connector
STMod+ module
connector
ARDUINO
®
Uno V3
shield connectors
PSRAM
240x240 LCD
Capacitive touch panel I
2
C
25 MHz oscillator
32 kHz crystal Quad-SPI Flash memory
Line-out
stereo jack
Line-in
stereo jack
Right speaker
connector
Left speaker
connector
ST-LINK/V2-1 USB Micro-B
connector
STM32F723IEK6
F
MC
add
r
ess
FM
C
data
FMC
PDM
microphones

UM2140 Rev 3 11/48
UM2140 Hardware layout and configuration
47
5.1 32F723EDISCOVERY Discovery kit layout
Figure 4. 32F723EDISCOVERY top layout
Pmod
™
connector
(P2)
Reset button
(B2)
Wake-up button
(B1)
STMod+
connector
(P1)
Control touch
panel connector
(CN16)
Four ST MEMS
microphones on
DFSDM inputs
(U16, U17, U18,
and U19)
240x240-pixel
TFT LCD
User LEDs
(LD5 and LD6)
ARDUINO
®
LED
(LD1)
ESP-01 Wi-Fi
®
connector
(CN14)
LCD connector
(CN17)
USB OTG HS
Micro-AB connector
(CN19)
USB OTG HS
overcurrent LED
(LD7)
USB OTG HS
V
BUS
LED
(LD8)
USB OTG FS
Micro-AB connector
(CN18)
USB OTG FS
overcurrent LED
(LD10)
USB OTG FS
V
BUS
LED
(LD9)
USB OTG FS USB OTG HS

Hardware layout and configuration UM2140
12/48 UM2140 Rev 3
Figure 5. 32F723EDISCOVERY bottom layout
ARDUINO®Uno V3 connector
(CN11, CN12, CN13, and CN15)
5 V power
selection
connector
(CN8)
STM32F723IEK6
MCU
(U8)
TAG debug
connector
(CN9)
External 5 V
power connector
(CN3)
JTAG
(CN2)
ST890CDR power
limiter fault LED
(LD3)
ST-LINK/V2-1 with
Micro-B connector
(CN1)
STM32F103CBT6
for ST-LINK
(U2)
5 V
Power LED
(LD2)
ST-LINK
COM LED
(LD4)
8-Mbit
PSRAM
Memory
(U10)
Stereo speaker
outputs
(CN10 and CN7)
Audio codec
(U7)
512-Mbit
Quad-SPI
Flash memory
(U6)
Stereo line-in
audio jack
(CN4)
Stereo line-out
audio jack
(CN5)

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UM2140 Hardware layout and configuration
47
5.2 32F723EDISCOVERY Discovery kit mechanical drawing
Figure 6. 32F723EDISCOVERY mechanical drawing
1. The digital microphones marked in orange (U16, U17, U18, and U19) are placed on the bottom side of the board.

Hardware layout and configuration UM2140
14/48 UM2140 Rev 3
5.3 Embedded ST-LINK/V2-1
The ST-LINK/V2-1 programming and debugging tool is integrated on the
32F723EDISCOVERY 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 3V
For general information concerning the debugging and programming features that are
common to both versions V2 and V2-1, refer to the user manual ST-LINK/V2 in-circuit
debugger/programmer for STM8 and STM32 (UM1075).
5.3.1 Drivers
Before connecting the 32F723EDISCOVERY board to a Windows®PC via USB, a driver for
ST-LINK/V2-1 must be installed. It can be downloaded from the www.st.com website.
In case the 32F723EDISCOVERY board is connected to the PC before installing the driver,
the PC device manager may report some 32F723EDISCOVERY board interfaces as
“Unknown”. To recover from this situation, after installing the dedicated driver, the
association of “Unknown” USB devices found on the 32F723EDISCOVERY board to this
dedicated driver, must be manually updated in the device manager.
Note: It is recommended to proceed using USB Composite Device, as shown in Figure 7.
Figure 7. USB composite device

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UM2140 Hardware layout and configuration
47
5.3.2 ST-LINK/V2-1 firmware upgrade
The ST-LINK/V2-1 embeds a firmware upgrade mechanism for in-situ upgrades through the
USB port. As the firmware may evolve during the lifetime of the ST-LINK/V2-1 product (for
example a new functionality, bug fixes, support for new microcontroller families), it is
recommended to visit the www.st.com website before starting to use the
32F723EDISCOVERY board and periodically, to stay up-to-date with the latest firmware
version.
5.4 Power supply
The 32F723EDISCOVERY board is designed to be powered from a 5 V DC power source. It
is possible to configure the 32F723EDISCOVERY board to use any of the sources
described in the following Table 4.
Note: The Discovery board must be powered by a power supply unit or by auxiliary equipment
complying with the standard EN-60950-1: 2006+A11/2009, and must be Safety Extra Low
Voltage (SELV) with limited power capability.
5.4.1 Supplying the board through the ST-LINK USB port (default setting)
To power the 32F723EDISCOVERY board in this way the host PC USB gets connected with
the ST-LINK USB port through a USB Type-A to Micro-B cable.
5 V DC power is provided by VBUS from the CN1 USB type Micro-B connector of ST-
LINK/V2-1 (USB 5 V power source on ST-LINK silkscreen, refer to Figure 8). If the
USB
enumeration succeeds (as explained below), the ST-LINK 5 V link power is enabled by
asserting the PWR_ENn signal. This pin is connected to the U1 ST890 power switch, which
powers the board. This power switch also features a current limitation to protect the PC in
case of a short-circuit on the board (current demand exceeding 700 mA).
The 32F723EDISCOVERY board can be powered from the CN1 ST-LINK USB connector,
but only the U2 STM32F103CBT6 is powered before USB enumeration because the host
PC only provides 100 mA to the board at that time. During the USB enumeration, the
32F723EDISCOVERY board asks for the 500 mA power to the host PC. Two events can
happen:
•If the host can provide the required power, the enumeration finishes by a
SetConfiguration command and
then, the power transistor ST890 is switched ON, the
Table 4. 32F723EDISCOVERY board power configuration
CN8 configuration Power connector Voltage
ST-LINK CN1 5 V
USB_STLINK CN1 5 V
E5V CN3 5 V
E5V CN12 7 V-12 V => 5 V
USB_HS CN19 5 V
USB_FS CN18 5 V

Hardware layout and configuration UM2140
16/48 UM2140 Rev 3
red LED LD2 is turned ON, thus the 32F723EDISCOVERY board consumes maximum
500 mA current, but no more.
•If the host is not able to provide the requested current, the enumeration fails. Therefore
the ST890 remains OFF and the STM32 part including the extension board is not
powered. As a
consequence, the LD2 red LED remains turned OFF. In this case, it is
mandatory to use an
external power supply.
Figure 8. CN8 ST-LINK connector
Note: In case the 32F723EDISCOVERY board is powered by a USB charger, there is no USB
enumeration, so the led
LD2 remains set to OFF permanently and the board is not powered.
Only in this specific
case, the resistor R5 needs to be ON, to allow the board to be powered
anyway.
The LED LD2 is lit when the 32F723EDISCOVERY board is powered by the 5 V correctly.
Caution: Do not connect a PC to the CN1 ST-LINK connector when R5 is ON. The PC may be
damaged or the board not powered correctly.
5.4.2 Supplying the board through a charger connected to ST-LINK
The 5 V DC power charger is connected to the CN1 USB_STLINK. In this case, if the
32F723EDISCOVERY board is powered by an external USB charger then the debug is not
available. If the PC is connected instead of the charger, then the limitation is no more
effective and the PC could be damaged (5 V power source on USB_STLINK silkscreen, refer
to Figure 9).
MSv44316V1
STLINK

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UM2140 Hardware layout and configuration
47
Figure 9. CN8 USB_STLINK connector
5.4.3 Supplying the board from E5V (On CN3 or CN12 connector)
Figure 10. CN8 external 5 V supply
From E5V: 5V DC power adapter connected to CN3
In this case, the 32F723EDISCOVERY board must be powered by a power supply unit or by
auxiliary equipment complying with standard EN-60950-1: 2006+A11/2009 connected to
CN3 and be Safety Extra Low Voltage (SELV) with limited power capability (5 V power source
on E5V silkscreen, refer to Figure 10).
From E5V: 7-12V DC power from CN12 VIN
7-12 V DC power supply is provided by an ARDUINO®Uno V3 compatible shield connected
to CN11, CN12, CN13, and CN15 connectors.
This 7-12 V VIN voltage is then converted to 5 V by U11 LDO.
Finally, the user must fit the jumper on the E5V position on the CN8 connector, to select this
E5V LDO output as the main power supply for the board. Refer to Figure 10.
MSv44317V1
USB STLINK
MSv44318V1
E5V

Hardware layout and configuration UM2140
18/48 UM2140 Rev 3
5.4.4 Supplying the board from an external power supply through USB HS
A 5 V DC external power supply is connected to the CN19 USB OTG HS Micro-AB
connector (5 V power source on USB_HS silkscreen, refer to Figure 11).
Figure 11. CN8 external USB_HS supply
5.4.5 Supplying the board from an external power supply through USB FS
A 5 V DC external power supply is connected to USB OTG FS Micro-AB connector CN18
(5 V power source on USB_FS silkscreen, refer to Figure 12).
Figure 12. CN8 external USB_FS supply
5.5 Programming/debugging when the power supply is not from
ST-LINK
It is mandatory to power the board first using CN3 E5V, or CN12 VIN, or CN18 USB FS, or
CN19 USB_HS, then connect the USB cable to the PC. Proceeding this way ensures that the
enumeration succeeds thanks to the external power source.
The following power sequence procedure must be respected:
MSv44319V1
USB HS
MSv44320V1
USB FS

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UM2140 Hardware layout and configuration
47
1. Connect the CN8 jumper on E5V or USB_HS or USB_FS.
2. Connect the external power source to CN3, or CN12, or CN18, or CN19.
3. Check that the LD2 red LED is turned ON.
4. Connect the PC to the CN1 USB connector.
If this order is not respected, the 32F723EDISCOVERY Discovery board may be powered by
VBUS first from ST-LINK and
the following risks may be encountered:
1. If more than 500 mA current is needed by the board, the PC may be damaged or the
current can be limited by the PC. As a consequence, the board is not powered correctly.
2. 500 mA is requested at the enumeration: if the PC cannot provide such a current, there
is a risk that the request is
rejected and the enumeration does not succeed.
5.6 Clock sources
Up to 2 clock sources as described below:
•X2 25 MHz oscillator for STM32F723IEK6 microcontroller
•X3 32 KHz crystal for the STM32F723IEK6 embedded RTC
5.7 Reset sources
The reset signal of the 32F723EDISCOVERY board is active LOW and the reset sources
include:
•Reset button B2
•ARDUINO®Uno V3 shield board from CN12
•Embedded ST-LINK/V2-1
5.8 Audio
An audio codec with 4 DACs and 2ADCs is connected to the SAI interface of
STM32F723IEK6. It communicates with STM32F723IEK6 via I2C bus:
•The analog line input is connected to the audio codec ADC through the CN4 blue audio
jack.
•The analog line output is connected to the audio codec DAC via the CN5 green audio
jack.
•Two external speakers can be connected to the audio codec via CN10 for the left
speaker and CN7 for the right speaker.
•Four digital ST-MEMS microphones are on the 32F723EDISCOVERY board. They are
connected to the digital microphone inputs of the audio codec.

Hardware layout and configuration UM2140
20/48 UM2140 Rev 3
5.9 USB OTG HS
The 32F723EDISCOVERY board supports USB OTG high-speed communication via a USB
Micro-AB connector.
A USB power switch is also connected to VBUS and provides power to CN19. The LD8 green
LED is lit in one of these cases:
•Power switch is ON and the 32F723EDISCOVERY board works as a USB host.
•VBUS is powered by another USB host when the 32F723EDISCOVERY board works as a
USB
device.
The LD7 red LED is lit when an overcurrent occurs.
Note:1 When the 32F723EDISCOVERY board is powered by the ST-LINK then the OTG function
can provide up to 100 mA.
Note:2 When the 32F723EDISCOVERY board is powered by an external power supply then the
OTG function can provide more than 100 mA, according to the external power supply
capability.
Note:3 When the 32F723EDISCOVERY board is powered by an external power supply through the
CN19 USB HS connector in device mode, do not use a PC as the power source. Refer to
Section 5.4.4.
5.10 USB OTG FS
The 32F723EDISCOVERY board supports USB OTG full-speed communication via a USB
Micro-AB connector.
A USB power switch is also connected to VBUS and provides power to CN18. The green LED
LD9 is lit in one of these cases:
•Power switch is ON and the 32F723EDISCOVERY board works as a USB host
•VBUS is powered by another USB host when the 32F723EDISCOVERY board works as a
USB device.
The red LED LD10 is lit when an overcurrent occurs.
Note:1 When the 32F723EDISCOVERY board is powered by the ST-LINK then the OTG function
provides up to 100 mA.
Note:2 When the 32F723EDISCOVERY board is powered by an external power supply then the
OTG function provides more than 100 mA, according to the external power supply
capability.
Note:3 When the 32F723EDISCOVERY board is powered by an external power supply through the
CN18 USB FS connector in device mode, do not use a PC as the power source. Refer to
Section 5.4.5.
Note:4 On Rev.C boards (MB1260 C01) in device mode, the path to the U22 ESD protection from
USB data pins causes a raised voltage on USB VBUS after disconnection. As a result, the
device disconnect event is not detected and the BCD capability cannot be used.
Note:5 On Rev.D boards (MB1260 D01), there is no more limitation. The device disconnect event is
detected and BCD capability can be used.