Datasheet

RN4870/71
DS50002489D-page 4  2016-2019 Microchip Technology Inc.
— — 13 6 P1_6 D Configurable pin. Refer to Section 1.2 “Module
Configuration” for details. When connected to host
MCU, set the pin connected to pin P1_6 in either high
impedance or drive pin low during firmware start-up
(approximately 22 msec).
— — 14 5 P1_7 D Configurable pin. Refer to Section 1.2 “Module
Configuration” for details.
9 11 15 15 P2_7 D O/p UART_TX_IND output pin. Provides indication if
RN4870 is transmitting to host MCU over UART.
Pulled low before UART TX begins and pulled high
after UART TX is over.
10 12 — — P1_1 D I/O
A I/p
GPIO; default: Input; pulled-high
AD9
Configured as the BLEDK_STATUS1_IND pin by
default
11 13 2 3 P1_2 D I/O
A I/p
GPIO; default: Input; pulled-high
AD10; I
2
C SCL pin
12 14 3 4 P1_3 D I/O GPIO; default: Input; pulled-high
AD11; I
2
C SDA pin
13 15 8 11 P0_0 D I/O GPIO; default: Input; pulled-high
AD0
Configured as the UART_CTS pin by default
14 16 — — P1_0 D I/O GPIO; default: Input; pulled-high
AD8
Configured as the BLEDK_STATUS2_IND pin by
default
15 17 6 9 P3_6 D I/O GPIO; default: Input; pulled-high
(only for RN4870)
Configured as the UART_RTS pin by default
16 18 16 16 P2_0 D I/p System configuration input;
1: Application mode
0: Test mode/Flash update/EEPROM configuration
Default: Input; pulled-high
17 19 — — P2_4 D I/O GPIO; default: Input; pulled-high
18 20 — — NC — No Connection
19 21 7 10 RST_N D I/p Module Reset; active-low; Internally pulled-high
20 22 5 7 UART_RX D I/p UART Data input
21 23 4 8 UART_TX D O/p UART Data output
22 24 — — P3_1 D I/O GPIO; default: Input; pulled-high
Configured as RSSI_IND pin by default; SPI NCS
Bus
23 25 — — P3_2 D I/p GPIO; default: Input; pulled-high
Configured as the LINK_DROP pin by default; SPI
MISO pin
24 26 — — P3_3 D I/p GPIO; default: Input; pulled-high
Configured as the UART RX Indication pin by default;
SPI MOSI pin
25 27 — — P3_4 D I/p GPIO; default: Input; pulled-high
Configured as the PAIRING_KEY pin by default; SPI
SCLK pin
TABLE 1-2: PIN DESCRIPTION (CONTINUED)
RN4870U RN4870 RN4871U RN4871 Name Type Description