Installation Instructions

AI-NB25
NB-IoT Module
Sichuan AI-Link Technology Co.,Ltd. page 11 of 20
4.4 Voltage Output
The power management unit of the module provides digital stable power output and provides
power for peripheral low-power devices. The output voltage and the maximum current of the pin
are as follows.
Pin Item
Pin Name
Describe
Voltage output
Voltage current
37
VSIM
SIM Power
1.8V /3.0V
150mA
4.5 Serial Port
The module contains two sets of serial interfaces for AT command transceiver, data transmission,
firmware upgrade and debugging. The major serial port can be used for AT command communication
and data transmission. The baud rate is 115 200 bps. It can also burn and upgrade firmware through
Flash tool. The baud rate of firmware upgrade is 115 200 bps.
4.6 Working Status
Active: Modules are active; all functions are available and data can be sent and received;
Modules can switch to Idle mode or PSM mode in this mode.
Idle: The module is in a shallow sleep state, the network remains connected and can receive
paging messages; in this mode, the module can switch to Active mode or PSM mode.
PSM: The module only works with RTC and is in the non-connected state of the network.
It no longer receives paging messages; however, the module needs to wake up after
RTC or external interruption
4.7 PSM mode (Power save consumption)
The maximum consumption of modules under PSM is less than 5uA. The main purpose of PSM
is to reduce module power consumption and extend battery power supply time. The following figure
shows the power consumption of modules in different modes.
Fig. 5 power consumption diagram