User Manual

F u s i o n f o r S T M 3 2 v 8 M a n u a l
P A G E 9
P O W E R S U P P L Y
Right under the POWER LED, there is a CHARGE LED, indicating the charging status for
the Li-Po or Li-Ion single cell battery, if connected. A complete battery power supply
section, including the battery charger circuit, is explained in the respective chapter
of this manual.
Below the POWER capacitive button, there is a RESET (6) capacitive button which is
not entirely power-related, but it has a similar function: it is routed to the MCU reset
pin. Pressing this button will trigger a reset of the host MCU.
Power/debug, USB-C connector
The development board can be powered over the USB-C connector, labeled as POWER/
DEBUG (2). This connector provides power from the USB host, USB power bank, or
USB wall adapter. When powered over the USB connector, the available power will
depend on the source capabilities.
Maximum power ratings, along with the allowed input voltage range in the case when
the USB power supply is used, are given in the table below:
Power 12VDC, external power supply
An external 12V power supply can be connected over the DC barrel connector, labeled
as POWER 12VDC (4). When using an external power supply, it is possible to obtain
an optimal amount of power, since one external power supply unit can be easily
switched for another, while its power and operating characteristics can be decided
per application. The development board allows maximum current of 3A per power rail,
when using an external 12V power supply.
The development board will be able to maintain its operating voltages within the
specified limits, as long as the voltage of the external power supply stays within the
range stated below, in the table. Having in mind all the additional peripherals that
can be connected to the development board, as well as their power consumption, the
external power supply should be considered as a primary power source, especially for
the most power demanding applications.
Maximum power ratings, along with the allowed input voltage range in the case when
the external power supply is used, are given in the table below:
N O T E
Figure 2: USB Power supply table
When using PC as a power source, the maximum power can be obtained if the host PC
supports the USB 3.2 interface, and is equipped with USB-C connectors. If the host PC
has a USB 2.0 interface, it will be able to provide the least power, since only up to 500
mA (2.5W at 5V) is available from the host in that case.
Note that when using long USB cables or USB cables of low quality, the voltage may
drop outside the rated operating voltage range, causing unpredictable behavior of the
development board.
N O T E If the host PC is not equipped with the USB-C connector, a Type A to Type C USB
adapter may be used.
Figure 3: External Power supply table
When connecting an external power supply over a barrel connector, make sure
that the polarity of the barrel connector is matched with its counterpart on
the development board, according to the image printed next to the male DC
connector.
Battery power supply
When powered by a single-cell Li-Po or Li-Ion battery, the development board offers
an option to be operated remotely. Combined with the fact that the board can be
USB Power Supply
Input Voltage [V] Output Voltage [V]
3.3
5
3.3 & 5
1.8
1.4
0.8 & 0.8
6.6
7.5
7.5
Max Current [A] Max Power [W]
MIN
4.4 5.5
MAX
External Power Supply
Input Voltage [V] Output Voltage [V]
3.3
5
3.3 & 5
2.8
2.8
2.8 & 2.8
9.24
14
23.24
Max Current [A] Max Power [W]
MIN
10.6 14
MAX