3.1 Power Supply

The RNBD350 Add On Board can be powered using any of the following sources depending on the use case scenario:

  1. The USB supplies power to the RNBD350 Add On Board using a USB Type-C cable connected to the USB Type-C Connector (J7). The module and the peripherals are powered by 3.3V generated from the on-board 3.3V linear regulator.
  2. The RNBD350PE Module and the peripherals are powered by 3.3V at J3, the mikroBUS interface when plugged into a host board.

The power selection between the USB power supply or the 3.3V from the mikroBUS interface is done by mounting a jumper cap JP1 on the power supply selection (J2).

Table 3-2. Jumper Cap JP1 Position to Select Power Supply Using J2 Power Supply Selection Header
3.3V Generated from USB Power Supply3.3V from mikroBUS™ Interface

JP1 on J2-3, J2-2

JP1 on J2-1, J2-2

Figure 3-2. RNBD350 Add On Board Power Supply Block Diagram

To measure the current consumed by the RNBD350PE Module alone, remove resistor (R6) and connect an ammeter across it.