•
If the host is able to provide the required power, the enumeration finishes by a “SetConfiguration” command
and then, the power switch STMPS2151STR is switched ON, the green LED LD3 (5V_PWR) is turned ON,
thus Nucleo board and its shield on it can consume 500 mA at the maximum.
•
If the host is not able to provide the requested current, the enumeration fails. Therefore, the
STMPS2151STR power switch (U4) remains OFF and the MCU part including the extension board is not
powered. As a consequence, the green LED LD5 remains turned OFF. In this case, it is mandatory to use an
external power supply.
Caution:
If the maximum current consumption of the STM32G4 Nucleo-64 board and its shield boards exceeds 300 mA, it
is mandatory to power the STM32G4 Nucleo-64 board with an external power supply connected to E5V, VIN or
3.3 V.
External power supply input from VIN (7 V - 12 V, 800 mA max)
When the STM32G4 Nucleo-64 board is power-supplied by VIN (refer to
configuration must be the following: jumper JP2 on pins 3-4 “5V_VIN”.
The STM32G4 Nucleo-64 board and its shield boards can be powered in three different ways from an external
power supply, depending on the voltage used. The three cases are summarized in
Table 6.
External power sources: VIN (7 V - 12 V)
Input power
name
Connector
pins
Voltage range
Maximum
current
Limitation
VIN
CN6 pin 8
CN7 pin 24
7 V to 12 V
800 mA
From 7 V to 12 V only and input current capability is
linked to input voltage:
•
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
UM2505
Power supply
UM2505
-
Rev 2
page 16/43
