Power Supply
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Power supply from lithium battery
Figure 5-2 Power supply (bottom view)
•
Power supply via USB connection: Power the board by connecting the board to the PC with a USB cable with
current passing through the on-board LDO. The LDO output voltage ranges from 1.8 V to 3.3 V; default: 3.3 V.
•
Power supply from external sources: Power the board by external sources (5 V) with current passing through
the on-board LDO. The default LDO output voltage is 3.3 V.
•
Power supply from lithium battery: Power the board by lithium batteries.
You can switch
S6
, to select the power supply mode (from lithium battery or the 3.3 V power output by the
on-board LDO). Reverse voltage protection is provided for power supply via USB connection and from external
sources through a pair of diodes (D100 and D105).
