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ABOUT THE DEVELOPMENT BOARD
Power supply
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Power supply
The development board provides a 3.3V
DC
switching power supply. Either a bench
power supply or an AC wall adapter supplies input power to the development board.
The required input voltage range is 9–30V
DC
.
Input power jack,
J3
The input power jack, J3, is a barrel connector that accepts 9-30 VDC. The power
jack is labeled J3 on the development board. This figure schematically represents
the power jack’s polarity:
Input power
supply
The output current of this regulator is limited to 2.4 amps and the Digi Connect Wi-
Wave module draws no more than .750 amps. Using these values as a guideline, and
using an 80% efficiency for the switching regulator, the input power supply should
be rated to provide at least 3 watts of power.
Important:
The development board can use USB power as the power source for the
3.3V regulator. This is accomplished by simply connecting the USB
Ground 9-30VDC +/- 5%