RN4870 Datasheet, PDF (11/48 Pages) Microchip Technology – Bluetooth 4.2 Low Energy Module

3.0 INTERFACE PINS
Figure 3-1 shows the power scheme using a 3.3V
low-dropout regulator to the RN487x and a host MCU.
This scheme ensures that the same voltage is used for
both the module and the MCU.
FIGURE 3-1:
POWER SCHEME
RN4870/71
Figure 3-1 also shows the basic UART connections to
the host MCU.
Figure 3-2 shows the recommended connections for
running the RN4870/71 on coin cell battery.
RN4870/71/70U
System Configurator
Note 1:
2:
3:
Ensure VDD_IO and MCU VDD voltages are compatible
Control and Indication ports are configurable
To implement low-power operation, enable the UART_RX_IND
pin and connect to ground.
RN4871U
System Configurator
Note 1:
2:
3:
4:
5:
Ensure VDD_IO and MCU VDD voltages are compatible
Control and Indication ports are configurable
10 µF (X5R) and 330 ohm resistor are required for RN487x
BK_IN connects to VBAT for RN4871U
To implement low-power operation, enable the UART_RX_IND
pin and connect to ground.
 2016 Microchip Technology Inc.
DS50002489A-page 11