M 5 2 2 3 3 D E M O
S E P T E M B E R 2 5 , 2 0 0 6
11
Terminal Block
The BATT terminal block is a 3.5mm, screw-type terminal block connected directly to the VDD
voltage rail. This allows the use of 2 AA batteries to supply power to the board. Exercise cau-
tion when using this input since input protection is not applied. This input requires a regulated
+3.3V voltage source.
Figure 3: BATT Terminal Block
Accepts wire size 28AWG – 16AWG
Applied voltage must be +3.3V.
- BATT
+
Connector J1
See the schematic for details on using this connection to supply power to the board or source
power from the board. This input requires a reg3.3V voltage source.
CAUTION:
Do not over drive either the J1 or BATT inputs as damage to the board may result.
VDD LED
The VDD LED indicates the state of power applied to the development board. The VDD LED
is located on the output of the OFF/ON switch. This LED will light when the board is energized
regardless of power input source.
POWER SWITCH
The OFF/ON switch connects and disconnects all input sources to the upper voltage rail. In
the OFF position, the board is unpowered and no voltage is present. In the ON position, the
input voltage source is connected to the upper voltage rail.
Figure 4: OFF/ON Switch
OFF/ON
CONFIGURATION
OFF - Input power source disconnected from upper voltage rail
OFF/ON
ON - Input power source connected to upper voltage rail
