Microchip Technology RN4870 - Page 4

RN4870/71
DS50002489G-page 4  2016-2023 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
Legend: Pin Type Abbreviations: A = Analog D = Digital I/O = Input/Output I/p = Input O/p = Output
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