Power Supply And Power Selection; External Power Supply Input; Table 6. Power Supply Capabilities - ST STM32 User Manual

6.4

Power supply and power selection

6.4.1

External power supply input

Several DC power sources can power the STM32 Nucleo-64 board. It is possible to supply the STM32 Nucleo-64
board with any of the following sources:
• STLK: 5 V from the STLINK-V2EC USB Type-C
• VIN: 7 to 12 V from the ARDUINO
• 5V_EXT: External 5 V power from ST morpho connector
• 5V_USB: 5 V from the USB Type-C
• 3V3 from the ARDUINO
Note: If the VIN, 5V_EXT, or 3V3 DC power source is used to power a Nucleo board, this power must comply with the
EN-62368-1: 2014/A11:2017 standard and must be safe with extralow voltage (SELV) with limited power
capability.
The power supply capabilities are shown in
Input power
STLK
VIN
5V_EXT
5V_USB
3V3
VDD
STLK is a 5 V DC power with limitations from the STLINK-V2EC USB connector (CN1). In this case, the 5V
jumper selection (JP1) must be on [1-2] to select the STLK power source on the JP1 silkscreen. This is the default
setting. If the USB enumeration succeeds, the STLK power is enabled, by asserting the T_PWR_EN signal
coming from STLINK-V2EC. This pin is connected to a 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 board, detected with a current
higher than 750 mA.
UM3353 - Rev 1
®
or ST morpho connector, with 5 V adaptation from LDO
®
connector
®
or ST morpho connector
Table
Table 6. Power supply capabilities
Connector
Voltage range
pins
CN1
4.75 to 5.5 V
JP1[1-2]
CN6 pin 8
CN7 pin 24 7 to 12 V
JP1[3-4]
CN7 pin 6
4.75 to 5.5 V
JP1[5-6]
CN13
4.75 to 5.5 V
JP1[7-8]
CN6 pin 4
3.0 to 3.6 V
CN7 pin 16
JP5 pin 1 1.71 to 3.6 V
®
connector
6.
Maximum
current
The maximum current depends on the presence or
absence of the USB enumeration:
500 mA
• 100 mA without enumeration
• 500 mA with enumeration
From 7 to 12 V only and input current capability is
linked to input voltage:
800 mA
• 800 mA input current when VIN = 7 V
• 450 mA input current when 7 V < VIN < 9 V
• 250 mA input current when 9 V < VIN < 12 V
The maximum current depends on the power source.
1 A 1 A maximum is recommended for this Nucleo-64
board.
The maximum current depends on the presence or
500 mA
absence of the USB enumeration.
The maximum current depends on the 3V3 source.
3V3 can be used when the STLINK-V2EC part of the
-
PCB is not used. SB2 might be OFF to protect LDO
(U9).
It is possible to power only the MCU power supply
pins by applying a voltage source on JP5 pin 1. In
this case, only the MCU is powered. External
-
functions like debugging, LED, or expansion
connectors are not powered. This option can be
used for the MCU power consumption measurement.
UM3353
Hardware layout and configuration
Limitation
page 12/31