Power Supply; External Power Supply Input; Table 7. Power Sources Capability - ST STM32L5 Nucleo-144 board User Manual

6.4

Power supply

6.4.1

External power supply input

The Nucleo board is designed to be powered by several DC power supply. It is possible to configure the Nucleo
board to use any of the following sources for the power supply:
• 5V_STLK from ST-LINK USB connector CN1
• VIN (7 to 12 V) from ARDUINO
• 5V_EXT from ST morpho connector CN11
• 5V_USB_C from USB Type-C
• 5V_CHGR from ST-LINK USB connector CN1
• 3V3 on 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 limitation from ST-LINK USB connector (USB Type Micro-B connector of ST-LINK/
V2-1). In this case, the JP6 jumper must be on pin [1-2] to select the 5V_STLK power source on the JP6
silkscreen. This is the default setting. If the USB enumeration succeeds, the 5V_STLK power is enabled, by
asserting the PWR_ENn signal (from STM32F103CBT6). This pin is connected to a power switch TPS2041C,
which powers the board. This power switch also features a 500 mA current limitation, to protect the PC in case of
an on-board short-circuit.
UM2581 - Rev 2
®
-included Zio connector CN8 or ST morpho connector CN11
™
connector CN15
®
-included Zio connector CN8 or ST morpho connector CN11
Table 7. 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 7.
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
Used when ST-LINK part of PCB is not used or
removed. SB3 must be OFF to protect LDO U6.
UM2581
Power supply
Limitation
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