Figure 2.
X-NUCLEO-OUT08A1 expansion board: digital interface components
The four Arduino
®
UNO R3 connectors:
•
allow expansion board communication with the
development board accessing STM32
peripheral and GPIO resources;
•
provide digital supply voltage between the
expansion board, in either direction.
Normally, the
development board supplies the expansion board by 3v3 or 5v0 (JP5 pins 1-2
closed) generated by the USB. You can select the preferred voltage on the expansion board via SW2 (3v3 by
closing pins 1-2; 5v0 by closing pins 2-3).
Alternatively, it is possible to supply the
development board by the expansion board. In this case,
an external supply voltage (7-12 V) should be connected to CN2 connector (not mounted by default) on the
expansion board and the ground loop should be closed by mounting D2 (that enables reverse polarity protection)
or by closing J3 (without reverse polarity).
To supply the V
IN
voltage rail is necessary to:
•
close jumper JP5 between pins 2 and 3 and open jumper JP1 on the
•
open jumper JP5 between pins 1 and 2 and close jumper JP5 between pins 3 and 4 on the
1.1.2
Power section
The power section involves the power supply voltage (CN1, pin 1 V
CC
, pin 2 GND), load connection (between
CN1 pin 3 and CN1 pin 2) and electromagnetic compatibility (EMC) protection (U2).
UM2715
Overview
UM2715
-
Rev 1
page 3/15
