SDBC-DK3UG Datasheet, PDF (5/76 Pages) Silicon Laboratories – 4 buttons and 4 LEDs for custom purposes

SDBC-DK3 UG
2. Power Supply
The board has three power options. The user can select between these options by the supply source selector
switch (SW1).
2.1. On Board PSU
The on board PSU supplies 3.3 VDC. In this mode, the board should be powered by a standard 9 V ac or 9–12 V
dc adapter.
2.2. External PSU
In this mode, the board can be powered via the direct dc supply connector by an external PSU. Any supply voltage
can be used in the 3.3–4 V range. Polarity is marked on the PCB.
2.3. Powered by USB Port
In this mode, the board can be powered via the USB connector.
Note: When using the white LED Flash option, it is recommend to use an alternative power supply.
Rev. 0.4
5