ST B-U585I-IOT02A User manual

Introduction
The B-U585I-IOT02A Discovery kit provides a complete demonstration and development platform for the STM32U585AI
microcontroller, featuring an Arm® Cortex®‑M33 core with Arm® TrustZone® and Armv8-M mainline security extension, 2 Mbytes
of flash memory and 786 Kbytes of SRAM, as well as smart peripheral resources.
This Discovery kit enables a wide diversity of applications by exploiting low-power communication, multiway sensing, and direct
connection to cloud servers.
It includes Wi‑Fi® and Bluetooth® modules, as well as microphones, temperature and humidity, magnetometer, accelerometer
and gyroscope, pressure, Time-of-Flight, and gesture-detection sensors.
The support for ARDUINO® Uno V3, STMod+, and Pmod™ connectivity provides unlimited expansion capabilities with a large
choice of specialized add-on boards.
For even more user-friendliness, the on-board STLINK-V3E debugger provides out-of-the-box loading and debugging
capabilities, as well as a USB Virtual COM port bridge.
The B-U585I-IOT02A Discovery kit leverages the STM32U5 series key assets to enable prototyping for a variety of wearable or
sensor applications in fitness, metering, industrial, or medical, with state-of-the-art energy efficiency and higher security.
Figure 1. B-U585I-IOT02A Discovery kit for the IoT node
Picture is not contractual.
Discovery kit for IoT node with STM32U5 series
UM2839
User manual
UM2839 - Rev 4 - May 2023
For further information contact your local STMicroelectronics sales office. www.st.com

1Features
• Ultra-low-power STM32U585AII6Q microcontroller based on the Arm® Cortex®‑M33 core with Arm®
TrustZone®, 2 Mbytes of flash memory and 786 Kbytes of SRAM, and SMPS in UFBGA169 package
• 512‑Mbit Quad-SPI flash memory, 64‑Mbit Octo‑SPI PSRAM, 256‑Kbit I2C EEPROM
• USB FS, Sink and Source power, 2.5 W power capability
• 802.11 b/g/n compliant Wi‑Fi® module from MXCHIP
• Bluetooth® Low Energy from STMicroelectronics
• MEMS sensors from STMicroelectronics
– 2 digital microphones
– Relative humidity and temperature sensor
– 3-axis magnetometer
– 3D accelerometer and 3D gyroscope
– Pressure sensor, 260-1260 hPa absolute digital output barometer
– Time-of-Flight and gesture-detection sensor
• Ambient-light sensor
• STSAFE authentication and security for peripherals and IoT devices from STMicroelectronics
• 2 user LEDs
• User push-button
• Reset push-button
• Board connectors
– USB Type-C®
– ARDUINO® Uno V3 expansion connectors
– Camera module expansion connector
– 2× STMod+ expansion connectors
– Pmod™ expansion connector
• Flexible power-supply options: ST-LINK USB VBUS, USB connector, or external sources
• On-board STLINK-V3E debugger/programmer with USB re-enumeration capability: mass storage, Virtual
COM port, and debug port
• Comprehensive free software libraries and examples available with the STM32CubeU5 MCU Package
• Support of a wide choice of Integrated Development Environments (IDEs) including IAR Embedded
Workbench®, MDK-ARM, and STM32CubeIDE
Note: Arm and TrustZone are registered trademarks of Arm Limited (or its subsidiaries) in the US and/or elsewhere.
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Features
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2Ordering information
To order the B-U585I-IOT02A Discovery kit, refer to Table 1. Additional information is available from the datasheet
and reference manual of the target STM32.
Table 1. Ordering information
Order code Board reference Target STM32
B-U585I-IOT02A MB1551 STM32U585AII6Q
2.1 Codification
The meaning of the codification is explained in Table 2.
Table 2. Codification explanation
B-XXXXM-AAANNT Description B-U585I-IOT02A
B Discovery kit with application focus Discovery kit for IoT node
XXXX MCU product line in STM32 32-bit Arm Cortex MCUs STM32U575/585 in the STM32U5 series
of ultra-low-power microcontrollers
MSTM32 flash memory size:
• I for 2 Mbytes 2 Mbytes
AAA Application focus:
• IOT for Internet of Things Internet of Things
NN Sequential number
Second Discovery kit for IoT node
(after B-L475E-IOT01A and its
B-L4S5I-IOT01A upgrade)
T
Connector type:
• A for ARDUINO®
• M for ST morpho
• Z for Zio connector
ARDUINO® connector
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Ordering information
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3Development environment
3.1 System requirements
• Multi‑OS support: Windows® 10, Linux® 64-bit, or macOS®
• USB Type-A or USB Type-C® to Micro-B cable
Note: macOS® is a trademark of Apple Inc., registered in the U.S. and other countries and regions.
Linux® is a registered trademark of Linus Torvalds.
Windows is a trademark of the Microsoft group of companies.
3.2 Development toolchains
•IAR Systems® - IAR Embedded Workbench®(1)
•Keil® - MDK-ARM(1)
• STMicroelectronics - STM32CubeIDE
1. On Windows® only.
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Development environment
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4Conventions
Table 3 provides the conventions used for the ON and OFF settings in the present document.
Table 3. ON/OFF convention
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 0 Ω resistor
Solder bridge SBx OFF SBx connections left open
Resistor Rx ON Resistor soldered
Resistor Rx OFF Resistor not soldered
Capacitor Cx ON Capacitor soldered
Capacitor Cx OFF Capacitor not soldered
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Conventions
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5Delivery recommendations
Before the first use, check the board for any damage that might have occurred during shipment, and check that all
socketed components are firmly fixed in their sockets and that none is loose in the plastic bag.
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Delivery recommendations
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6Getting started
1. Make sure that the jumpers and switches are in the default position according to Figure 27.
2. Install the STLINK-V3E USB driver available on the www.st.com website.
3. Connect the board to the laptop using the CN8 ST-LINK connector, which is a USB Micro-B port.
4. Open a terminal like Tera Term and configure it with the following parameters:
– 115200 bps baud rate
– 8-bit data size
– No parity
5. The LD3 red COM LED is lit and the LD5 5V LED blinks.
6. Provide Wi‑Fi® credential (SSID/PWD) via terminal.
7. Via the browser (client), it is possible to ping the server via IP.
Now, a web page appears on the browser and the web page content is accessible.
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Getting started
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7Hardware layout and configuration
The B-U585I-IOT02A Discovery kit is designed around the STM32U585AII6Q target microcontroller in a 169-pin
BGA package. The hardware block diagram in Figure 2 illustrates the connection between the STM32 and
peripherals:
Figure 2. Hardware block diagram
STM32U585AII6Q
MP23DB01HPTR digital
microphone
RTC
SWD
3.3 V Power
supply
32 KHz crystal
STLINK-V3E
GPIOs and
SPI2
MDF/ADF
EMW3080
Wi-Fi® module
Pmod™ connector
(CN4)
LEDs,
Reset and user buttons GPIOs
GPIOs, SPI1
GPIOs, and
UART2
USB Type-C®
Sink and Source USB-C
OCTOSPI2
MX25LM51245GXDI00
512-Mbit Octo-SPI flash
VCP
UART1
ARDUINO® Uno
shield connectors
GPIOs,
UART3,
and SPI1
USB
Micro-B
connector
GPIOs and
UART4
STM32WB5MMGH6TR
Bluetooth® module
M24256-DFMC6TG
I2C bus EEPROM
GPIOs and
I2C2
IIS2MDCTR 3-axis
magnetometer
ISM330DHCX
3D accelerometer
and 3D gyroscope
LPS22HH
digital barometer
HTS221
humidity and temperature
VL53L5CXV0GC/1
time-of-flight and gesture
detection
STSAFE-A110
authentication and
security
MP23DB01HPTR digital
microphone
GPIOs, SPI3
GPIOs, and
UART3
STMod+ connector
(CN2)
STMod+ connector
(CN3)
GPIOs, SPI1
GPIOs, and
UART2
Camera connector
GPIOs and
I2C1
VEML6030 / VEML3235
ambient light
64-Mbit Octo-SPI RAM
TCPP03 for
USB Type-C®
GPIOs and
I2C2
OCTOSPI1
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Hardware layout and configuration
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Figure 3. B-U585I-IOT02A Discovery kit layout (top view)
DT55054V1
Microphones
(U6, U7)
STM32WB55
Bluetooth® Low Energy
module
(U1)
User LEDs
(LD6, LD7)
5V source
selection
(JP4)
STLINK-V3E
USB port (CN8)
STMod+
(CN3)
User button
(B3)
Reset button
(B2)
Camera connector
(CN7)
Pmod™
(CN4)
USB type-C®
(CN1)
5V power LED
(LD5)
STMod+
(CN2)
TAG connector
(CN10)
USB LED
(LD1)
WLAN module
(M1)
VL53L5
Time-of-flight
sensor
(U27)
VEML6030
Light
sensor
(U17)
Bluetooth® Low Energy
module debug connector
(CN5)
Bluetooth® Low Energy
module boot selection
(SW6)
Bluetooth® Low Energy
module power selection
(SW3)
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Hardware layout and configuration

Figure 4. B-U585I-IOT02A Discovery kit layout (bottom view)
DT55055V1
ARDUINO®
(CN13)
ARDUINO®
(CN17)
Bluetooth® module
USB (CN12)
ARDUINO® Power
(CN16)
Bluetooth® module
reset (B1)
Optional
battery holder
(CN15)
MCU debug switch
(SW4)
Bluetooth® Low Energy
debug switch
(SW5)
ARDUINO®
(CN14)
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Hardware layout and configuration

Figure 5. B-U585I-IOT02A Discovery kit mechanical drawing in millimeters
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Hardware layout and configuration

7.1 Embedded STLINK-V3E
7.1.1 Description
There are two different ways to program and debug the onboard STM32 MCU:
• Using the STLINK-V3E programming and debugging tool integrated into the B-U585I-IOT02A Discovery
kit. Check that the SW5 switch is in the OFF position and SW4 in the ON position to make sure that the
ST-LINK is connected to the target MCU.
• Using an external debug tool connected to the CN9 MIPI10 connector
The embedded STLINK-V3E supports only SWD and VCP for STM32 devices. For information about debugging
and programming features, refer to the technical note Overview of ST-LINK derivatives (TN1235), which describes
in detail all the STLINK-V3E features.
Features supported in STLINK-V3E:
• 5 V power supplied by the CN8 USB connector
• USB 2.0 high-speed-compatible interface
• JTAG and SWD protocols compatible with 3 to 3.6 V application voltage and 5 V tolerant inputs
• Serial Wire Viewer (SWV) output
• CN9 STDC14 MIPI10‑compatible connector
• LD3 status COM LED blinking during communication with the PC
• LD4 OC fault red LED alerting on USB overcurrent request
• U18 5 V / 500 mA output power supply capability with current limitation
• LD5 5V power green LED
7.1.2 Drivers
Before connecting the Discovery kit for the IoT node board to a Windows® PC via USB, the user must install a
driver for the STLINK-V3E. It is available on the www.st.com website.
In case the B-U585I-IOT02A Discovery kit board is connected to the PC before the driver is installed, some
B-U585I-IOT02A Discovery kit interfaces may be declared as “Unknown” in the PC device manager. In this case,
the user must install the dedicated driver files, and update the driver of the connected device from the device
manager as shown in Figure 6.
Note: Prefer using the USB Composite Device handle for a full recovery.
Figure 6. USB composite device
7.1.3 STLINK-V3E firmware upgrade
The STLINK-V3E embeds a firmware upgrade mechanism through the USB port. As the firmware may
evolve during the lifetime of the STLINK-V3E product to add new functionalities, fix bugs, and support new
microcontroller families, it is recommended to visit the www.st.com website before starting to use the B-U585I-
IOT02A Discovery kit and periodically, to stay up-to-date with the latest firmware version.
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Embedded STLINK-V3E
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7.1.4 Using an external debug tool to program and debug the on-board STM32
There are two basic ways to support an external debug tool:
1. Keep the embedded STLINK-V3E running. Power on the STLINK-V3E at first until the COM LED lights RED.
Then connect the external debug tool through the CN9 MIPI10 debug connector.
2. Set the embedded STLINK-V3E in a high-impedance state. When the jumper JP1 (STLK_RST) is set ON,
the embedded STLINK-V3E is in the RESET state, and all GPIOs are in high impedance. Then the user can
connect his external debug tool to the CN9 debug connector or the CN10 TAG connector.
Figure 7. Connecting an external debug tool to program the on-board STM32
DT55057V1
ST-LINK USB connector
(CN8)
ST-LINK reset jumper
(JP1)
Debug connector to connect
to external tool
(CN9)
TAG connector
(CN10)
Power supply selection
(JP4)
Table 4 describes the CN9 STDC14/MIPI10 debug connector pinout.
Table 4. CN9 STDC14/MIPI10 debug connector pinout
MIPI10 STDC14 pin CN9 Designation
- 1 NC Reserved
- 2 NC Reserved
1 3 T_VCC Target VCC
2 4 T_SWDIO Target SWDIO using SWD protocol or Target JTMS (T_JTMS) using JTAG
protocol
3 5 GND Ground
4 6 T_SWCLK Target SWCLK using SWD protocol or Target JCLK (T_JCLK) using JTAG
protocol
5 7 GND Ground
6 8 T_SWO Target SWO using SWD protocol or Target JTDO (T_JTMS) using JTAG
protocol
7 9 T_JRCLK Not used by SWD protocol, Target JRCLK (T_JRCLK) using JTAG protocol,
only for specific use
8 10 T_JTDI Not used by SWD protocol, Target JTDI (T_JTDI) using JTAG protocol, only
for external tools
9 11 GNDDetect GND detection for plug indicator, used on SWD and JTAG
10 12 T_NRST Target NRST using SWD protocol or Target JTMS (T_JTMS) using JTAG
protocol
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Embedded STLINK-V3E
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MIPI10 STDC14 pin CN9 Designation
- 13 T_VCP_RX Target RX used for VCP (UART supporting bootloader)
- 14 T_VCP_TX Target TX used for VCP (UART supporting bootloader)
TAG connector
The CN10 TAG connector is implemented on the B-U585I-IOT02A Discovery kit. The TAG connector is a 10‑pin
footprint supporting SWD mode, which is shared with the same signals as the ST-LINK. The TC2050-IDC-NL
cable is the recommended one to link ST-LINK and TAG connectors on the B-U585I-IOT02A Discovery kit so that
the MCU can be easily programmed and debugged without any extra accessories.
Figure 8. TAG connector
Figure 9. TC2050-IDC-NL cable
Table 5. TAG connector pinout
Connector Pin
number Pin name Signal name STM32U5 pin Function
CN10
1 3V3 3V3 - Power
2 SWD T.SWDIO PA13 Serial wire data I/O
3 GND - - Ground
4 SWCLK T.SWCLK PA14 Serial wire clock
5 GND - - Ground
6 SWO T.SWO PB3 Serial wire output
7 NC - - -
8JTDI T.JTDI PA15 Serial wire input
9 NC - - -
10 NRST NRST NRST RESET
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Embedded STLINK-V3E
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7.2 Power supply
The B-U585I-IOT02A Discovery kit board is designed to be powered by a 5 V DC power supply. It is possible
to configure the B-U585I-IOT02A Discovery kit using the JP4 jumper to select any of the four following power
sources: 5V_USB_STLK, 5V_VIN, 5V_UCPD, 5V_VBAT, and 5V_USB_CHGR.
5V_USB_STLK: JP4 [1-2]
(Refer to Figure 10)
This is a 5 V DC power from the CN8 STLINK-V3E USB connector. This is the default setting. If the
USB enumeration succeeds, the 5V_USB_STLK power is enabled, by asserting the T_PWR_EN signal (from
STM32F723IEK). This pin is connected to an STMPS2151STR power switch, which powers the board. This
power switch also features a current limitation to protect the PC in case of an onboard short circuit (the current is
higher than 500 mA). The B-U585I-IOT02A Discovery kit can be powered from the CN8 ST-LINK USB connector,
but only the ST-LINK circuit has the power before USB enumeration because the host PC only provides 100
mA to the board at that time. During the USB enumeration, the B-U585I-IOT02A Discovery kit asks for 500
mA power to the host PC. If the host can provide the required power, the STMPS2151STR power transistor
is switched ON, and the LD3 red LED is turned ON, thus the B-U585I-IOT02A Discovery kit can consume
up to 500 mA current, but no more. If the host cannot provide the requested current, the enumeration fails.
Therefore, the STMPS2151STR remains OFF and the MCU part including the extension board is not powered.
As a consequence, the LD3 red LED remains turned OFF. In this case, it is mandatory to use an external power
supply.
Figure 10. JP4: 5V_USB_STLK selection
5V_VIN: JP4 [3-4]
(Refer to Figure 11)
This is the 7 to 12 V DC power from ARDUINO® CN17 pin 8 (named VIN on ARDUINO® connector silkscreen). In
this case, the JP4 jumper must be fitted between pin 3 and pin 4 to select the 5V_VIN power source. In this case,
the DC power comes from the power supply through the ARDUINO® Uno V3 battery shield (compatible with the
Adafruit PowerBoost 500 shield).
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Power supply
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Figure 11. JP4: 5V_VIN selection from CN17 (VIN)
5V_UCPD: JP4 [5-6]
(Refer to Figure 12)
This is the DC power with a 500 mA limitation from the CN14 USB Type-C® connector. In this case, the JP4
jumper must be fitted between pin 5 and pin 6 to select the 5V_UCPD power source.
Figure 12. JP4: 5V_UCPD
5V_USB_CHGR: JP4 [7-8]
(Refer to Figure 13)
This is the DC power charger connected to the CN8 USB ST-LINK connector. To select the 5V_USB_CHGR
power source, the JP4 jumper must be fitted between pin 7 and pin 8. In this case, if the B-U585I-IOT02A
Discovery kit is powered by an external USB charger, then the debug is not available. If the PC is connected
instead of the charger, the limitation is no longer effective, and the PC might be damaged.
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Power supply
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Figure 13. JP4: 5V_USB_CHGR selection
Note: If the board is powered by a USB charger, there is no USB enumeration, so the LD3 LED remains OFF
permanently.
Caution: Do not connect the PC to the CN8 ST-LINK connector. The PC might be damaged or the board might not be
powered correctly.
The LD5 green LED is lit when the B-U585I-IOT02A Discovery kit is powered by the 5 V correctly.
The power tree is shown in Figure 14.
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Power supply
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Figure 14. Power tree
DT55062V1
TAG
USB_ST_LINK
5V_UCPD
ARDUINO®
2*STMod+ connectors
STLINK-V3E
Camera connector
STM32U585AII6Q
MCU
ST_LINK debug
MP23DB01MMTR digital microphone
MXCHIP EMW3080BP
Wi-Fi® module
APS6408L-xOB
64-Mbit Octo-SPI SRAM
MEMS:
IIS2MDCTR gyroscope,
ISM330DHCX magnetometer,
LPS22HH barometer,
HTS221 humidity and temperature,
VL53L5 time-of-flight,
and VEML6030 ambient light
sensors
M24256-DFMC6TG I2C memory.
Pmod™ connector
STSAFE-A110
authentication and security
MP23DB01MMTR digital microphone
ST1L05APU33R 3V3
5V
VDD_MCU
JP3
U19
JP4
STMPS2151STRP
5 V/500 mA
power switch
U18
LD3985M33R
LDO
U35
5V_USB_STLK
5V_VIN
5V_UCPD
5V_USB_CHGR
LD1117S50TR
LDO
U38
5V_VIN 5V
VREFP
VIN
3V3
5V_VIN
5V_USB_STLK
3V3_STLK
LD1117STR
U36
5V
5V_UCPD
MX25LM51245GXDI00
512-Mbit Octo-SPI flash
5V
5V
5V
STM32WB5MMGH6TR
Bluetooth® module
2V8
CN13
CN14
CN17
CN16
1
10
1
8
1
6
1
8
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Power supply
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7.3 Clock source
The board is designed with two crystals:
• X1: Crystal for the STM32U585AI HSE clock inputs. This component is optional and not fitted by default.
• X2: 32.768 kHz crystal for the STM32U585AI LSE clock inputs
Table 6. I/O configuration for the optional HSE
I/O Solder
bridge Setting Configuration
PH0 SB5
ON PH0-OSC_IN is connected to STLK_MCO 8 MHz.
OFF PH0-OSC_IN terminal is not connected to STLK_MCO.
PHO OSC_IN is connected to the 16 MHz HSE crystal.
PH1 SB4 ON PH1 is used as GPIO MEMs enable.
OFF PH1 OSC_OUT is connected to the 16 MHz HSE crystal.
7.4 MCU management
7.4.1 Reset sources
The active LOW reset sources are:
• The B2 reset button
• The reset signal coming from CN17 pin 3
• The reset signal coming from ST-LINK
7.4.2 MCU boot switch and jumper for current measurement
Table 7. MCU jumper and switch
Reference Name Comment
JP3 Jumper
Jumper for MCU current measurement
The MCU current measurement can be performed on JP3.
By default, a jumper is placed on JP3.
For the current measurement configuration, an ammeter must replace the JP3
jumper.
SW1
Switch
BOOT0 MCU‑boot mode selection. Refer to the MCU specification for more
details.
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Clock source
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7.5 USB Type-C® FS port
The B-U585I-IOT02A Discovery kit supports USB full-speed (FS) communication. The CN1 USB connector is a
USB Type-C® connector.
USB connectors can power the Discovery board at a 5 V DC voltage with a 500 mA current limitation.
A USB Power Delivery TCPP03 unit (U8) is also connected to VBUS_C for overvoltage protection.
• The LD1 LED is provided for VBUS_C detection.
The LD1 LED is ON when a 5V_UCPD from USB Type-C® is present.
Section 7.2 provides information on how to use the powering options.
7.5.1 Device and Host modes
When a USB host connection to the CN1 USB Type-C® connector of the B-U585I-IOT02A Discovery kit is
detected, the board starts behaving as a USB device. Depending on the powering capability of the USB host, the
board can take power from the VBUS terminal of CN1. In the board schematic diagrams, the corresponding power
voltage line is called 5V_UCPD.
It is possible to support the Host mode by mounting the 16 MHz HSE clock X1 and setting the SB4 and SB5
solder bridges OFF. In this configuration, be aware that the U27 VL53L5CXV0GC/1 Time-of-Flight sensor does
not work anymore.
Refer to Table 6 in the Clock source section.
Note: In Sink mode, the JP4 jumper must be set on the 5V_UCPD position.
Note: In Source mode, the JP4 jumper must be set on the 5V_USB_STLK position.
7.5.2 UCPD description
USB Type-C® introduces the USB Power Delivery feature. The B-U585I-IOT02A board supports the Sink and
Source modes.
In addition to the DP/DM I/Os directly connected to the USB Type-C® connector, some I/Os are also
used for UCPD configuration: Configuration channel (CCx), VBUS-SENSE, IBUS_SENSE, I2C interface, and
UCPD_FAULT (FLT) feature.
To protect B-U585I-IOT02A from USB overvoltage, a PPS‑compliant USB Type-C® port protection is used, the
TCPP03-M20 IC‑compliant with IEC6100-4-2 level 4.
Configuration channel I/Os
These UCPD_CCx signals are connected to the associated CCx line of the USB Type-C® connector through the
ST TCPP03-M20 USB port protection. These lines are used for the configuration channel lines (CCx) to select the
USB Type-C® current mode.
VBUS fault detection
This UCPD_FLT signal is provided by the ST USB Type-C® port protection. It is used as fault reporting to MCU
after a bad VBUS level detection. By design, the B-U585I-IOT02A VBUS protection is set to 6 V maximum with the
RSENSE.
An I2C bus drives the TCPP03-M20. The base I2C-bus address is 0x68 (0b 0110.100x).
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USB Type-C® FS port
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