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UM2469
7.3.2
ST-LINK/V2-1 firmware upgrade
The ST-LINK/V2-1 embeds a firmware upgrade mechanism for in-situ upgrade through the
USB port. As the firmware may evolve during the life time of the ST-LINK/V2-1 product (for
example a new functionality, bug fixes, support for new microcontroller families), it is
recommended to visit the
board and periodically, to stay up-to-date with the latest firmware version.
7.4
Power supply
The STM32F7308-DK board is designed to be powered from a 5 V DC power source. It is
possible to configure the STM32F7308-DK board to use any of the sources described in the
following
CN8 configuration
USB_STLINK
Note:
The Discovery board must be powered by a power supply unit or by an auxiliary equipment
complying with the standard EN-60950-1: 2006+A11/2009, and must be Safety Extra Low
Voltage (SELV) with limited power capability.
7.4.1
Supplying the board through the ST-LINK USB port (default setting)
To power the STM32F7308-DK board in this way the USB host (PC) gets connected with
the ST-LINK USB port through a USB Type-A to Micro-B cable.
5 V DC power is provided by V
LINK/V2-1 (USB 5 V power source on silkscreen "ST-LINK", see
enumeration succeeds (as explained below), the ST-LINK 5 V link power is enabled by
asserting the PWR_ENn signal. This pin is connected to U1, a power switch ST890, which
powers the board. This power switch also features a current limitation to protect the PC in
case of a short-circuit on the board (current demand exceeding 700 mA).
The STM32F7308-DK board can be powered from the ST-LINK USB connector CN1
(STLINK), but only the STM32F103CBT6 (U2) is powered before USB enumeration,
because the host PC only provides 100 mA to the board at that time. During the USB
enumeration, the STM32F7308-DK board asks for the 500 mA power to the host PC. Two
events can happen:
•
If the host is able to provide the required power, the enumeration finishes by a
"SetConfiguration" command and then, the power transistor ST890 is switched ON, the
red LED LD2 is turned ON, thus the STM32F7308-DK board consumes maximum
500 mA current, but no more.
www.st.com
Table
2.
Table 2. STM32F7308-DK board power configuration
ST-LINK
E5V
E5V
USB_HS
USB_FS
website before starting to use the STM32F7308-DK
Power connector
CN1
CN1
CN3
CN12
CN19
CN18
from the USB type Micro-B connector (CN1) of ST-
BUS
UM2469 Rev 1
Hardware layout and configuration
Voltage
7 V-12 V => 5 V
Figure
8). If the USB
5 V
5 V
5 V
5 V
5 V
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