Microchip Technology RN4870-I/RM128, Manual, Page: 7 / 55

RN4870/71
DS50002489E-page 4 2016-2021 Microchip Technology Inc.
13 6 P1_6 D Configurable pin. Refer to Section
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
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