1.1.1
Digital section
The digital section is associated with the STM32 interface and the digital supply voltage to and from the
expansion board.
Figure 2.
X-NUCLEO-OUT15A1 expansion board: digital interface section
The dotted green line indicates the whole digital interface section. The pink rectangles identify the Arduino
®
UNO R3
connectors.
The four Arduino
®
UNO R3 connectors:
•
allow the expansion board to communicate with the
development board microcontroller
accessing the STM32 peripheral and GPIO resources;
•
provide the digital supply voltage between the
expansion board, in either direction.
Normally, the
development board supplies the expansion board by a 3v3 or 5v0 generated by the
USB. You can select the preferred voltage on the expansion board via SW3 (3v3 closing pins 1-2; 5v0 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 the CN2 connector (not mounted by default) on the
expansion board and the ground loop should be closed by mounting D2 (enabling the reverse polarity protection)
or by closing J2 (without reverse polarity).
To supply the VIN voltage rail, it is necessary to:
•
close the JP5 jumper between pins 2 and 3 and open the JP1 jumper on the
•
open the JP5 jumper between pins 1 and 2 and close the JP5 jumper between pins 3 and 4 on the
.
UM3036
Overview
UM3036
-
Rev 1
page 3/20
