Drivers and firmware upgrade
The STLINK-V3E requires drivers to be installed on Windows
®
. It embeds a firmware that needs to be updated
from time to time in order to benefit from new functionalities and bug corrections. Refer to technical note Overview
of ST-LINK derivatives (TN1235) for details.
6.4 Power supply
The STM32H745I-DISCO and STM32H750B-DK Discovery kits are designed to be powered from a 5 V DC power
source. Either of the following five 5 V DC power inputs can be used, upon appropriate board configuration:
• Micro-B USB receptacle CN14 of STLINK-V3E without enumeration: up to 500 mA can be supplied to the
board (JP8 jumper setting on CHGR position on the silkscreen).
• 7 to 12 V DC power from CN3 pin8: named VIN on the silkscreen, extension connectors for ARDUINO
®
Uno
shields or daughterboard (JP8 jumper setting on E5V on the silkscreen).
• 48 V DC power from RJ45 connector CN1 (Ethernet):
In this case, the on-board module PoE (Power over Ethernet) generates the 5 V supply voltage with up to
600 mA. This module is a powered device complying with IEEE 802.3af, class 1 / 2 standard. The external
power supply must be fully IEEE 802.3af compliant (JP8 jumper setting on POE5V on the silkscreen).
• Micro-AB USB receptacle CN13 of the USB OTG_FS interface: marked USB OTG FS on the board (JP8
jumper setting on USBFS on the silkscreen), and supplying up to 500 mA to the board.
• Micro-B USB receptacle CN15 of the USB power: marked USB PWR on the board (JP8 jumper setting on
USBPWR on the silkscreen), and supplying up to 500 mA to the board.
• Micro-B USB receptacle CN14 of STLINK-V3E with enumeration: with enumeration feature (see Supplying
the board through the STLINK-V3E USB port), up to 500 mA can be supplied to the board (JP8 jumper
setting on STLK on the silkscreen).
The LD4 green LED turns ON when the voltage on the power line marked as +5 V is present. All the supply
voltage lines required for the operation of the STM32H745I-DISCO/STM32H750B-DK components are derived
from this +5 V line.
Supplying the board through the STLINK-V3E USB port
To power the STM32H745I-DISCO and STM32H750B-DK in this way, the USB host (a PC) gets connected to the
Micro-B USB receptacle of the board via a USB cable. The connection event starts the USB enumeration
procedure. In its initial phase, the host USB port current supply capability is limited to 100 mA. This is sufficient
since only the STLINK-V3E part of the STM32H745I-DISCO/STM32H750B-DK draws power at that time: the U24
STMPS2151 power switch is set to the OFF position, which isolates the rest of the board from the power source.
In the next phase of the enumeration procedure, the host PC informs the STLINK-V3E that it is able to supply
current up to 300 mA. If the answer is positive, the STLINK-V3E sets the U24 STMPS2151 switch to the ON
position to supply power to the rest of the board. Otherwise, CN3 pin8 (VIN) or CN15 can be used to supply the
board instead.
Should a short-circuit occur on the board, the STMPS2151 power switch protects the USB port of the host PC
against a current demand exceeding 500 mA, In such an event, the LD4 LED lights up.
The STM32H745I-DISCO and STM32H750B-DK boards can also be supplied from a USB power source that
does not support enumeration, such as a USB charger. In this particular case, JP6 jumper must be ON with a
jumper hat as shown in Table 4. Power-supply related jumper and solder bridge settings. STLINK-V3E bypasses
STMPS2151 power regardless of the enumeration procedure result and passes the power unconditionally to the
board.
The LD4 green LED turns ON whenever the whole board is powered.
Using STLINK-V3E along with powering through external power
It can happen that the board requires a supply current higher than 300 mA. It consequently cannot be supplied
from host PC connected to STLINK-V3E USB port for debugging or programming the STM32H745XIH6 or
STM32H750XBH6 microcontroller. In such a case, the board can be supplied through CN3 pin8 (marked VIN on
the board) or by CN15.
To do this, it is important to power the board before connecting it with the host PC, which requires the following
sequence to be respected:
UM2488
Power supply
UM2488 - Rev 4
page 11/55
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