Power Supply; Power Supply Sources; Supplying The Board Through St-Link/V2-1 Usb Port - STMicroelectronics STM32F469I-DISCO User Manual

UM1932
functionality and performance. The firmware may evolve during the life span of
STM32F469I-DISCO to include new functionality, fix bugs or support new target
microcontroller families. It is therefore recommended to keep ST-LINK/V2-1 firmware up to
date. The latest version is available at
that allows flashing its dedicated MCU via the USB interface on the hosting board, here
STM32F469I-DISCO. The whole process is controlled from a Windows
available at www.st.com.
4.2

Power supply

4.2.1

Power supply sources

The STM32F469I-DISCO board is designed to be powered by the following sources:
•
5 V DC from the ST-LINK/V2-1 USB connector CN1 with 500 mA current limitation.
Power mechanism of the board supplied by the USB ST-LINK/V2-1 is explained below
(Section 4.2.2: Supplying the board through ST-LINK/V2-1 USB
jumper JP2 must be closed by placing a jumper in location called STLK on the
silkscreen of the board. Jumper JP5 must be closed.The red LED LD5 lights up to
confirm the presence of +5 V voltage.
•
5 V DC from the user USB FS connector CN13. Pins 5 and 6 of jumper JP2 must be
closed by placing a jumper in location called USB on the silkscreen of the board.
Jumper JP5 must be closed. The red LED LD5 lights up to confirm the presence of
+5 V voltage.
•
6 V to 9 V DC from VIN pin of ARDUINO
must be limited to 9 V to keep the temperature of the regulator U10 within its thermal
safe area. Pins 1 and 2 of jumper JP2 must be closed by placing a jumper in location
called E5V on the silkscreen of the board. Jumper JP5 must be closed. The red LED
LD5 lights up to confirm the presence of +5 V voltage.
In case VIN, +5V is used to power the 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.
4.2.2

Supplying the board through ST-LINK/V2-1 USB port

To power the STM32F469I-DISCO board in this way, the USB host (a PC) gets connected
with the STM32F469I-DISCO board via a USB cable to the ST-LINK/V2-1 connector.
In the first step, only the ST-LINK part U3 is powered by the PC. In fact, before USB
enumeration, the host PC provides only 100 mA to the board at that time. The STM32F469I-
DISCO board requests a 500 mA power to the host PC. If the host is able to provide the
required power, the enumeration finishes by a "SetConfiguration" command and then, the
power switch ST890 U4 is switched ON, the red LED LD5 is turned ON, thus the board can
consume no more than 500 mA. If the host is not able to provide such requested current, the
enumeration fails. Therefore the ST890 U4 remains OFF and the board is not powered. As
a consequence, the red LED LD5 remains turned OFF. In this case, it is mandatory to use
another power supply source.
www.st.com. ST-LINK/V2-1 supports a mechanism
®
compatible connector CN6. The voltage
UM1932 Rev 3
Hardware layout and configuration
®
PC application also
port). Pins 3 and 4 of
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