RTC Backup Battery & Charge Circuit
-
1mAh
backup battery for the RTC for certain MicroMod
Processor Boards . Receives charge voltage from
3.3V
.
microSD Slot
- Insert a µSD card formatted to FAT32(?) here to log your data.
Power Control Circuit
The Data Logging Carrier Board features two
3.3V/600mA
voltage regulators that have their Enable pins tied to
I/O pins on an attached MicroMod Processor Board. This allows control of the regulators' output with a few lines of
code making it extremely simple to control and conserve power in battery-powered applications. The
G1-3V3
line
is controlled by G1 on the MicroMod Processor and the
G2-3.3V
circuit is (as you may suspect) is controlled by G2
on the MicroMod Processor. The
G1-3.3V
power circuit is tied to several pins highlighted in the below photo for
extra flexibility powering external devices. The
G2-3V3
output is tied to the
3.3V
pin on the Qwiic connector as well
as a dedicated PTH pin labeled G2-3V3.
Battery Charging Circuit
The board also has a MCP73831 Single-Cell Lithium-Ion/Lithium-Polymer Charge IC so you can charge an
attached single-cell LiPo battery. The charge IC receives power primarily from USB and can source up to 450mA
to charge an attached battery.
