Sichuan AI Link Technology AI NB25 User Manual

AI-NB25

NB-IoT Module

Features：

➢ Support Band

B1/B3/B5/B8
B2/B4/B12/B66/B71/B85

➢ Chip Solution

MT2625DA/MT2625DP

➢ Size& Dimension

18.7 mm x 16.0mm x 2.5mm

Model Overview

Sichuan AI-Link Technology Co.,Ltd.

Add : Anzhou,Industrial Park,Mianyang,Sichuan
Fax : [phone]
Web site : http://www.changhong.com
FAE Tel : [phone]

Model

Installation

Standard

Support Bands

Antenna

Note

AI-NB25

SMD

3GPP Rel-13

B1/B2/B3/B4/B5/B12/B66/B71/B85

External option

/

AI-NB25

NB-IoT Module

Sichuan AI-Link Technology Co.,Ltd. page 2 of 20

Feedback of customer’s Confirmation

We accept the specification after Confirmed

Customer name

Customer signature

Confirmation Date

Please feed back this paper and first page after your signature by the address, thanks!

ADD： Anzhou,Industrial Park,Mianyang,Sichuan

Factory： Sichuan AI-Link Technology Co.,Ltd.

Approved

Checked

Designed

Product

NB-IoT Module

Model

AI - NB25

Date

2019- 04-17

AI-NB25

NB-IoT Module

Sichuan AI-Link Technology Co.,Ltd. page 3 of 20

Record of Modification

No

Date of

modification

Main content of modification

Reason of

modification

Serial number of

modification

Confirm

1

2018-11-26

Initial release

Nicky.li

2

2018-12-16

Adding Band 66 in
support band list

Nicky.li

3

2019-01-10

Adding Antenna &
RF reference design

Nicky.li

4

2019-01-17

Adding Antenna
design indicators

Nicky.li

5

2019-03-19

Changing label to laser
marking on shiled cover

Nicky.li

6

2019-04-17

Adding 3GPPS RF standard
to RF specification

Nicky.li

7

2019-04-22

Adding FCC certification
announcement

Nicky.li

AI-NB25

NB-IoT Module

Sichuan AI-Link Technology Co.,Ltd. page 4 of 20

1. Overview

AI-NB25 is an NB-IoT module that communicates with the infrastructure of mobile network operators
through the 3GPP Rel-13 radio protocol. The core communication chip is the first NB-IoT chipset
developed by MTK. It has embedded 2MB Flash and 2MB RAM. It integrates MCU, PMU, Flash, RAM, DSP,
RF and other units. It has the characteristics of high integration and low cost.

AI-NB25 module integrates RF power amplifier PA, crystal, LDO, DC-DC, reserves eSIM card, and
reserves UART, ADC, SIM, RESET and GPIO interfaces to expand various applications. Some interfaces can
be reused to facilitate customer secondary product development.

AI-NB25 module supports work in bands B1, B2,B3,B4,B5,B12,B66,B71 and B85 . It can provide data
transmission, short message and other services, and also supports the 3GPP Rel-13 standard.

AI-NB25 module is an SMD type module with size only 18.7mm x 16.0mm x 2.5mm. There are total
54 pins. It can be embedded in various product applications through welding pad. The product size is
small and itsperipheral interface is rich.Compared with similar products, the advantage is obvious.

AI-NB25 module is the basic module for data wide communication in the field of Internet of Things. It
can provide stable and extensive communication. The application scenario is more extensive, so long as
the coverage of NB-IoT signals can support communication services.

1.1 Fundamental Performance

Projects

Information

Voltage Input

VBAT power supply voltage range: 2.1V ~ 3.63V,
typical supply voltage 3.3V

Bands

Support B1\B2\B3\B4\B5\B8\B12\B66\B71\B85

RF Power

23±2dBm

Current consumed

5uA MAX (PSM model)

Temperature range

-40°C ~ 85°C

SMS / Voice

Support SMS

SIM cards

Support only 1 set external SIM card

Antenna interface

50ohm RF impedance ( Support only 1 set external antenna)

Size

18.7mm x16.0mm x2.5mm

AI-NB25

NB-IoT Module

Sichuan AI-Link Technology Co.,Ltd. page 5 of 20

1.2 Main functions of products

◆ It supports NB-IoT B1\B2\B4\B3\B5\B8\B12\B66\B71\B85 band, provides digital transmission services,

and supports 3GPP Rel-13 standard

◆ Supports only 1 set external SIM card

◆ Supports 3 groups UARTs

◆ Supports 1 sets SPI of chip

◆ GPIO supports 32 sets of GPIOs.

◆ Supports 1 sets of ADC interfaces

◆ NB-IoT power supply 3.3V (typical value)

◆ Radio frequency antenna interface, 50 ohm standard interface

2. Application interface

The AI-NB25 module has 54 patch pins. The following sections briefly describe the

functions of each pin interface of the module.

2.1 Pin Distribution

Fig. 1 Diagram of pin distribution

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