UM1932 Rev 4
13/31
UM1932
Hardware layout and configuration
30
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:
1. Set the jumper in JP2 header in E5V position.
2. Connect an external power source to VIN pin 8 of ARDUINO
®
connector CN6.
3. Check the red LED LD5 is turned on.
4. Connect host PC to USB connector CN1.
The ST890 power switch protects the USB port of the host against current demand
exceeding 600 mA, should a short-circuit occur on the board.
The 32F469IDISCOVERY board can also be supplied from a USB power source not
supporting enumeration, such as a USB charger. In this particular case, the solder bridge
SB16 must be closed. ST-LINK/V2-1 turns the ST890 power switch U4 ON regardless of
enumeration procedure result and passes the power unconditionally to the board.
4.2.3
Measurement of current I
DD
drawn by the STM32F469NI
The jumper JP5 should be closed (default) to supply the STM32F469NI MCU. To measure
the current I
DD
drawn by the microcontroller STM32F469NIH6 only, remove jumper JP5 and
replace it by a multimeter.
4.2.4
Power related jumpers
The power supply is configured by setting the related jumpers JP2, JP5 and solder bridge
SB8
Table 3: Power related jumpers
.
Table 3. Power related jumpers
Jumper,
solder bridge
Description
JP5
JP5 I
DD
is used to measure STM32 current consumption manually by multimeter.
Default setting
: Closed by a jumper
SB8
By default SB8 is closed to power +3V3 from regulator U7.
If the board is powered by the pin 1 of extension connector CN12 or by the pin 4 of
the ARDUINO
®
connector CN6, it is mandatory to open SB8 to avoid reverse
current injection in regulator U7.
(Default setting):
SB8 closed
JP2
JP2 is used to select one of the five possible power supply sources.
To supply the board from the ST-LINK/V2-1 USB connector CN1, JP2 should be set
as shown to the right:
(Default Setting)
