Hardware layout and configuration
UM1932
12/31
UM1932 Rev 4
LINK/V2-1 functionality and performance. The firmware may evolve during the life span of
32F469IDISCOVERY 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
www.st.com.
ST-LINK/V2-1 supports a mechanism
that allows programming its dedicated MCU via the USB interface on the hosting board,
here 32F469IDISCOVERY. The whole process is controlled from a Windows
®
PC
application also available at
www.st.com
.
4.2 Power
supply
4.2.1
Power supply sources
The 32F469IDISCOVERY 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 port
). Pins 3 and 4 of
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
®
compatible connector CN6. The voltage
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 32F469IDISCOVERY board in this way, the USB host (a PC) gets connected
with the 32F469IDISCOVERY 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
32F469IDISCOVERY 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.
