2016-2023 Microchip Technology Inc. DS50002489G-page 5
RN4870/71
FIGURE 1-1: PIN DIAGRAM – RN4870U
26 28 — — P3_5 D I/O
A I/p
GPIO; default: Input; pulled high,
LED1; provides indication whether the module is
on/off.
27 29 — — P0_7 D I/O GPIO; default: Input; pulled high,
Configured to the LOW_BATTERY_INDICATOR pin
by default.
28 30 9 12 P0_2 D I/O AD2,
LED0: Provides indication whether the module is in
On/Off mode.
29 31 17 2 GND Power Ground reference.
— 32 — — GND Power Ground reference.
30 — 1 — BT_RF A I/O External antenna connection (50 Ohms). Only for
RN4870U and RN4871U. No connection for RN4871.
— 33 — — GND Power Ground reference.
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
TP-2 TP-2 CLDO_O
TP-1 VCC_PA
TP-3 VCC_RF
TP-1
TP-3
GND
GND
VBAT
P2_2
VDD_IO
VDD_IO
ULPC_O
P2_3
BK_O
P2_7/TX_IND
P1_1
P1_2
P1_3
P0_0/CTS
P1_0
P3_6/RTS
P2_0/MODE
P2_4
NC
RST_N
P0_2/LED
P0_7
P3_5
P3_4
P3_3
P3_2
P3_1
UART_TX
UART_RX
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
301
BT_RF
2
30
1
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