Datasheet

 2016-2019 Microchip Technology Inc. DS50002489D-page 13
RN4870/71
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 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.
FIGURE 3-1: POWER SCHEME
System Configurator
System Configurator
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_IND
pin and connect to ground.
Note 1: Ensure VDD_IO and MCU V
DD voltages are compatible
2: Control and Indication ports are configurable
3: 10 µF (X5R) and 330 ohm resistor are required for RN487x
4: BK_IN connects to VBAT for RN4871U
5: To implement low-power operation, enable the UART_RX_IND
pin and connect to ground.
RN4870/71/70U
RN4871U
Reset IC
Reset
System Configurator
System Configurator
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_IND
pin and connect to ground.
Note 1: Ensure VDD_IO and MCU V
DD voltages are compatible
2: Control and Indication ports are configurable
3: 10 µF (X5R) and 330 ohm resistor are required for RN487x
4: BK_IN connects to VBAT for RN4871U
5: To implement low-power operation, enable the UART_RX_IND
pin and connect to ground.
RN4870/71/70U
RN4871U
Reset IC
Reset
Reset IC
Reset