User Manual

An external 12V power supply can be connected over the 12VDC barrel
connector (labeled as CN7) or over the 2-pole screw terminal (labeled
2.3.2 12VDC barrel-type connector and screw
terminal
Figure 5: USB power supply table
Figure 6: External power supply table
USB power supply
Input Voltage [V] Output Voltage [V]
3.3
5
3.3 & 5
1.7
1.3
0.7 & 0.7
5.61
6.5
5.81
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
When using a PC as the 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 uses the 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
in that case. Note that when using longer 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
N O T E
N O T E
If the USB host is not equipped with the USB-C connector, a Type A to
Type C USB adapter may be used (included in the package).
12V barrel-type connector and screw terminal should not be used
simultaneously by two different power supplies, as the connectors
are routed in parallel.
When connecting an external power supply over the barrel connector,
make sure that the polarity of the barrel connector is matched with
the 12VDC connector on the development board, according to the
image printed on the front side, above the connector itself.
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:
as TB1). 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
exchanged with another, while its power and operating characteristics can
be decided per application. The development board allows a maximum
current of 2.8A per power rail (3.3V and 5V) when using an external 12V
power supply. The barrel-type connector is useful for connecting wall-
adapters, while the screw terminal is a good choice when there is no
connector installed at the end of the PSU cable.
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:
mikromedia 5 for STM32 CAPACITIVE U S E R M A N U A L