Справочник Пользователя для Digi 90000797_A
. . . . .
A B O U T T H E D E V E L O P M E N T B O A R D
Power supply
www.digiembedded.com
21
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
P o w e r s u p p l y
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
The required input voltage range is 9–30V
DC
.
Input power jack,
J3
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:
jack is labeled J3 on the development board. This figure schematically represents
the power jack’s polarity:
Input power
supply
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.
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
3.3V regulator. This is accomplished by simply connecting the USB
Ground
9-30VDC +/- 5%