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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 Figure 3.
External Power Supply
Input Voltage [V]
Output Voltage [V]
MIN
MAX
10.6
14
3.3 & 5
Figure 3: External Power supply table
When connecting an external power supply over a barrel connector,
N O T E
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
remotely programmed and debugged over the WiFi network, the EasyaAVR PRO v8
development board allows complete autonomy, allowing it to be used in some very
specific situations: hazardous enviroment, agricultural application and etc.
N O T E
It is advised to disable the battery charging circuitry if there is no battery
connected to the EasyAVR PRO v8 development board. This can be done
using CODEGRIP Suite. For more information, please consult the CODEGRIP
manual on the following link:
The battery connector used on the development board is a 2.5mm pitch XH
connector. It allows a range of Li-Po and Li-Ion batteries to be used. The
development board offers battery charging functionality from both the USB
connector, and the external power supply. The battery charging circuitry of
the PSU module manages the battery charging process, allowing the optimal
charging conditions and longer battery life. Charging process is indicated by
a CHARGER LED indicator. The battery charging current can be configured by
Max Current [A]
Max Power [W]
3.3
2.8
9.24
5
2.8
14
2.8 & 2.8
23.24
www.mikroe.com/manual/codegrip
using the CODEGRIP Suite, which offers a choice between 100mA and 500mA
when the USB power supply is used, or between 100mA and 200mA, when
the external 12V power supply is used. In the case when the EasyAVR PRO
v8 development board is powered down, the charging current will be set to
500mA by default (200mA with the external power supply).
If both the external 12V power supply and the USB cable are connected to the
development board, the battery will be charged from the external 12V power
supply, thus minimizing the USB power consumption.
Maximum power ratings at fully charged battery, along with the allowed input
voltage range when the battery power supply is used, are given in the table
Figure 4.
Battery Power Supply
Input Voltage [V]
Output Voltage [V]
3.3
MIN
MAX
5
3.5
4.2
3.3 & 5
Figure 4: Battery Power Supply table
Using USB hubs, long USB cables, and low-quality USB cables, may
cause a significant USB voltage drop, which can obstruct the battery
charging process.
Power redundancy and uninterrupted
power supply (UPS)
The PSU module supports power supply redundancy: it will automatically
switch to the most appropriate power source if one of the connected power
sources fails or becomes disconnected. The power supply redundancy also
allows for an uninterrupted operation (e.g. UPS functionality, the battery will
still provide power if the USB cable is removed, without resetting the MCU
during the transition period).
Max Current [A]
Max Power [W]
1.6
5.28
1.2
6
0.7 & 0.7
5.81
E a s y A V R P R O v 8 M a n u a l
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