3.1.2 Switching-Based Power Supply
The simple capacitive power supply does not provide enough current for the MSP430F6638 to drive RF transceivers. Therefore, a switching-based power supply is required. An additional power supply module on the board provides 3.3-V dc from the ac mains of 110-V or 220-V ac. The internal circuitry for this module is not provided with this application report.