3.1 Power Supply

The RNWF02 Add On Board can be powered using any of the following sources, depending on the use case scenario, but the default supply is from the host PC using a USB Type-C® cable:

  1. USB Type-C supply – Jumper (JP200) is connected between J201-1 and J201-2.
    • The USB supplies 5V to Low-Dropout (LDO) MCP1727 (U200) to generate 3.3V supply for the VDD supply pin of RNWF02PC module.
  2. Host board 3.3V supply – Jumper (JP200) is connected between J201-3 and J201-2.
    • The host board supplies 3.3V power through the mikroBUS header to the VDD supply pin of the RNWF02PC module.
  3. (Optional) Host board 5V supply – There is a provision to supply 5V from the host board with rework (populate R244 and depopulate R243). Do not mount jumper (JP200) on J201 when the host board 5V supply is used.
    • The host board provides 5V supply through the mikroBUS header to the LDO regulator (MCP1727) (U200) to generate 3.3V supply for VDD supply pin of the RNWF02PC module.
Note: The VDDIO is shorted with the VDD supply of the RNWF02PC module.
Table 3-2. Jumper JP200 Position on J201 Header for the Power Supply Selection
3.3V Generated from USB Power Supply (Default)3.3V from mikroBUS Interface
JP200 on J201-1 and J201-2JP200 on J201-3 and J201-2

The following figure illustrates the power supply sources used to power the RNWF02 Add On Board.

Figure 3-2. Power Supply Block Diagram
Note:
  • Remove the supply selection jumper (JP200) present on the supply selection header (J201), then connect an ammeter between J201-2 and J201-3 for external supply current measurement.
  • Remove the supply selection jumper (JP200) present on the supply selection header (J201), then connect an ammeter between J201-2 and J201-1 for USB Type-C supply current measurement.