2.1 Power Sources

The following figure shows the power sources of the MCP2222.

Figure 2-1. MCP2222 Power Sources Block Diagram

The MCP2222 Breakout Board supports three main input power sources:

  1. Power sourced from the mikroBUS™ connector 5V pin.

    • A 3.3V supply derived from the 5V source using the on-board 3.3V regulator

  2. Power sourced from the mikroBUS connector 3V3 pin.

  3. Power sourced from the USB Type-C® connector VBUS pin (typically 5V).

    • A 3.3V supply derived from the 5V source using the on-board 3.3V regulator

To support multiple power sources, the board includes two diode OR gates: One for the 5V supplies and one for the 3.3V supplies. The 5V and 3.3V outputs are connected to the two ends of the voltage-select jumper.

Alternatively, a 5V or 3.3V supply can be fed directly through the VTG pin. In this case, ensure that the voltage-select jumper is not connected.

Note: When 3.3V is directly connected to the VTG pin with no voltage-select jumper installed, the MCP2222 device is powered from the 3.3V supply connected to the VTG pin, while the USB transceiver (VUSB pin) is powered by the on-board 3.3V regulator, which draws power from the USB bus VBUS pin.