2.3 Power Supply

Figure 2-5. Power Selection

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 PC using Type-C USB cable:

  1. Type-C USB supply – Jumper (JP200) is connected in between J201-1 and J201-2 to supply using Type-C USB cable.
    • The USB supplies 5V to Low-Dropout (LDO) MCP1727 (U200) , to generate 3.3V supply for VDD supply pin of RNWF02 Module.
    • VDD supply derives VDDIO supply to the RNWF02 Module.
  2. Host board 3.3V supply – Jumper (JP200) is connected in between J201-3 and J201-2 to supply using Host board 3.3V supply.
    • The host board supplies 3.3V power through mikroBus header to VDD supply pin of the RNWF02 Module.
    • VDD supply derives the VDDIO supply to the RNWF02 Module.
  3. (Optional) Host board 5V supply – There is provision to supply 5V from Host board with rework (populate R244 and depopulate R243). Do not mount jumper (JP200) on J201 when host board 5V supply is used.
    • The Host board provides 5V supply through mikroBus header to LDO regulator (MCP1727) ((U200)) to generate 3.3V supply for VDD supply pin of the RNWF02 Module.
    • VDD supply derives the VDDIO supply to the RNWF02 Module.
Mounting the jumper JP200 on J201 for Power selection between USB power supply or the 3.3V from the mikroBUS interface.
Table 2-3. Power Selection
3.3V Generated from USB Power Supply 3.3V from mikroBUS Interface
JP200 on J201-1 and J201-2 JP200 on J201-3 andJ201-2

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

Figure 2-6.  Power Supply Block Diagram
Note: The maximum available current from the USB (J200) is limited to 500 mA.