5.4 Interface Pins

The following illustrates the power scheme using a 3.3V low-dropout regulator to the RNBD451 module and a host MCU. This scheme ensures using the same voltage for both the module and the MCU.

Figure 5-2. Power Scheme
Note:
  1. Ensure VDD_IO and MCU VDD voltages are compatible.
  2. Control and indication ports are configurable.
  3. To implement low-power operation, enable the UART RX indication pin, connect to host MCU and control.
  4. These connectivities are optional and needed only when there is a need for UART flow control.