Installation Instructions

AI-NB25
NB-IoT Module
Sichuan AI-Link Technology Co.,Ltd. page 6 of 20
2.2 Pin Definition
Pin No
Pin Name
Type
Describe
Comments
1
GND
Ground
2
RF_ANT
I/O
Module antenna interface, RF output
50 ohm characteristic impedance
3
GND
Ground
4
RESERVED
Reserved
5
RESERVED
Reserved
6
RESET
I
Module reset pin, active low,
staging time greater than 100ms
7
RESERVED
Reserved
8
AUX_TXD
O
Auxiliary serial port, sending data
9
AUX_RXD
I
Auxiliary serial port, receive data
10
RESERVED
Reserved
11
GND
Ground
12
RESERVED
Reserved
13
RESERVED
Reserved
14
RESERVED
Reserved
15
RESERVED
Reserved
16
VDD_EXT
Reserved
17
GND
Ground
18
RESERVED
Reserved
19
RESERVED
Reserved
20
RESERVED
Reserved
21
ADC
I
Analog-to-digital conversion
22
RESERVED
Reserved
23
HST_RXD
I
Major serial port, receive data, used for AT
command and data transmission.
24
HST_TXD
O
Major serial port, sending data, used for AT
command and data transmission
25
GND
Ground
26
LED
O
Network indicator LED
27
RESERVED
Reserved
28
GND
Ground
29
VBAT
I
Module power supply, 2.4V ~ 3.63V,
Typical voltage 3.3V
30
VBAT
I
Module power supply, 2.4V ~ 3.63V,
Typical voltage 3.3V
31
GND
Ground
32
RTC_ENIG
I
Input GPIO port for extended RTC Interrupt
33
Power Key
I
Module boot Power Key, drop-down effective
34
RESERVED
Reserved