UM2206 Rev 3
19/55
UM2206
Hardware layout and configuration
54
powers the board. This power switch also features a current limitation to protect the PC in
case of a short-circuit on board (more than 750 mA).
The STM32 Nucleo-64-P board and its shield can be powered from the ST-LINK USB
connector CN1, but only ST-LINK circuit is powered before USB enumeration, because the
host PC only provides 100 mA to the board at that time. During the USB enumeration,
STM32 Nucleo-64-P board requires 500 mA of current to the host PC. If the host is able to
provide the required power, the enumeration ends by a “SetConfiguration” command and
then, the power transistor ST890 is switched ON, the green LED LD3 is turned ON, thus the
STM32 Nucleo-64-P board and its shield request no more than 500 mA current. If the host
is not able to provide the required current, the enumeration fails. Therefore the power switch
ST890 stays OFF and the MCU part including the extension board is not powered. As a
consequence the green LED LD3 stays turned OFF. In this case it is mandatory to use an
external power supply.
USB power: 5V_STL configuration: jumper JP5[1-2] should be connected as showed in
Figure 10
.
Figure 10. JP5[1-2]: 5V_STL power source
VIN (5V_VIN
) is the 7-12 V DC power from Arduino CN8 pin 8 named V
IN
on Arduino
connector silkscreen or from ST morpho connector CN5 pin 24. In this case JP5 jumper
PWR connector:
JP5 [1-2] ON
USB_STLINK: CN1
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