User Manual

P A G E 14
mikromedia 5 for STM32 CAPACITIVE U S E R M A N U A L
POWER SUPPLY
When powered by a single-cell Li-Po/Li-Ion battery, mikromedia 5 offers an
option to be operated remotely. This allows complete autonomy, allowing
it to be used in some very specific situations: hazardous environments,
agricultural applications, etc.
The battery connector is a standard 2.5mm pitch XH connector. It allows
a range of single-cell Li-Po and Li-Ion batteries to be used. The PSU of
mikromedia 5 offers the battery charging functionality, from both the USB
connector and the 12VDC/external power supply. The battery charging
circuitry of the PSU manages the battery charging process, allowing the
optimal charging conditions and longer battery life. The charging process
is indicated by BATT LED indicator, located on the front of mikromedia 5.
The PSU module also includes the battery charger circuit. Depending on the
operational status of the mikromedia 5 development board, the charging
current can be either set to 100mA or 500mA. When the development
board is powered OFF, the charger IC will allocate all available power for the
battery charging purpose. This results in faster charging, with the charging
current set to approximately 500mA. While powered ON, the available
charging current will be set to approximately 100 mA, reducing the overall
power consumption to a reasonable level.
2.3.3 Li-Po/Li-Ion XH battery connector
Maximum power ratings along with the allowed input voltage range when
the battery power supply is used, are given in the table below:
Figure 7: Battery power supply table
Battery power supply
Input Voltage [V] Output Voltage [V]
3.3
5
3.3 & 5
1.3
1.1
0.6 & 0.6
4.29
5.5
4.98
Max Current [A] Max Power [W]
MIN
3.5 4.2
MAX
N O T E Using low-quality USB hubs, and too long or low-quality USB cables,
may cause a significant USB voltage drop, which can obstruct the
battery charging process.