Power Supply And Power Selection; External Power Supply Input; Table 8. Power Sources Capability - ST STM32U5 User Manual

6.4

Power supply and power selection

6.4.1

External power supply input

The Nucleo board is designed to be powered by several DC power supplies. It is possible to configure the Nucleo
board to use any of the following sources for the power supply:
• 5V_STLK from CN1 STLINK-V3E USB connector
• VIN (7 to 12 V) from CN8 ARDUINO
• 5V_EXT from CN11 ST morpho connector
• 5V_USB_C from CN15 USB Type-C
• 5V_CHGR from CN1 STLINK-V3E USB connector
• 3V3 from CN8 ARDUINO
If VIN, 5V_EXT, or 3V3 is used to power a Nucleo-144 board, this power source must comply with the standard
EN‑60950‑1: 2006+A11/2009 and must be safety extra‑low voltage (SELV) with limited power capability.
The power supply capabilities are summarized in
Input Power name
5V_STLK
VIN / 5V_VIN
5V_EXT
5V_USB_C
5V_CHGR
3V3
5V_STLK is a DC power with the limitation from the STLINK-V3E USB connector (USB Type Micro-B connector
of STLINK-V3E). In this case, the JP6 jumper must be on pin [1-2] to select the 5V_STLK power source.
This is the default setting. If the USB enumeration succeeds, the 5V_STLK power is enabled, by asserting the
T_PWR_EN signal from U6 STLINK-V3E MCU. This pin is connected to the U2 power switch, which powers
the board. This power switch also features a 500 mA current limitation, to protect the PC in case of an onboard
short-circuit.
The STM32U5 Nucleo-144 board with its shield can be powered from the CN1 STLINK-V3E USB connector, but
only the STLINK-V3E circuit has the power before USB enumeration because the host PC only provides 100mA
to the board at that time. During the USB enumeration, the Nucleo board asks for a 500mA power to the host PC.
• If the host can provide the required power, the enumeration finishes by a SetConfiguration command
and then, the U2 power switch is switched ON, the Green LED LD5 is turned ON, thus the Nucleo board with
its shield can consume 500mA current, but no more.
UM2861 - Rev 2
®
-included Zio connector or CN11 ST morpho connector
®
connector
®
-included Zio connector or CN11 ST morpho connector
Table 8. Power sources capability
Connector pins Voltage range
CN1 pin 1
4.75 to 5.25 V
JP6 [1-2]
CN8 pin 15
7 to 12 V
CN11 pin 24
JP6 [3-4]
CN11 pin 6
4.75 to 5.25 V
JP6 [5-6]
CN15
4.75 to 5.25 V
JP6 [7-8]
CN1 pin 1
4.75 to 5.25 V
JP6 [9-10]
CN8 pin 7
CN11 pin 16 3.0 to 3.6 V
JP5 pin 2
Table 8.
Max.
current
Maximum current depending on the presence or
absence of USB enumeration:
500 mA
• 100 mA without enumeration
• 500 mA with enumeration OK
From 7 to 12 V only and input current capability is
linked to input voltage:
• 800 mA input current when VIN = 7 V
800 mA
• 450 mA input current when 7 V < VIN < 9 V
• 250 mA input current when 9 V < VIN < 12 V
500 mA Maximum current depending on the power source
Maximum current depending on the USB host used
1 A
to power the Nucleo
Maximum current depending on the USB wall
500 mA
charger used to power the Nucleo
Maximum current depending on the 3V3 source.
-
Used when the ST-LINK part of PCB is not used or
removed. SB1 must be OFF to protect LDO U6.
UM2861
Power supply and power selection
Limitation
page 17/49