5.1 Changing Operating Voltage on the ATtiny817 Xplained Mini
The ATtiny817 Xplained Mini has a default VCC of 5V. Many extension kits require 3.3V; in order to enable the boards to communicate effectively, they need to operate at the same voltage. It is possible to change the operating voltage on the Xplained Mini with only a few steps. Figure 5-1 shows the schematic for the power supply circuitry on the Xplained Mini. By removing the 0Ω resistor R100, and making the 3.3V connection outlined in Figure 5-2, the operating voltage will be changed from 5V to 3.3V.
