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 Model Installation Standard Support Bands Antenna Note AI-NB25 SMD 3GPP Rel-13 B1/B2/B3/B4/B5/B12/B66/B71/B85 External option / Sichuan AI-Link Technology Co.,Ltd. Add : Anzhou,Industrial Park,Mianyang,Sichuan Fax : +86-0816-2438701 Web site : http://www.changhong.
AI-NB25 NB-IoT Module 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 Sichuan AI-Link Technology Co.,Ltd.
AI-NB25 NB-IoT Module Record of Modification No Date of modification 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.
AI-NB25 NB-IoT Module 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 NB-IoT Module 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 2. ◆ 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.
AI-NB25 NB-IoT Module 2.2 Pin Definition Pin No 1 Pin Name GND Type RF_ANT 3 GND 4 5 RESERVED RESERVED 6 RESET 7 8 9 10 11 12 13 14 15 16 17 18 RESERVED AUX_TXD AUX_RXD RESERVED GND RESERVED RESERVED RESERVED RESERVED VDD_EXT GND RESERVED 19 RESERVED Reserved 20 21 22 RESERVED ADC RESERVED I 23 HST_RXD I 24 HST_TXD O 25 GND Reserved Analog-to-digital conversion Reserved Major serial port, receive data, used for AT command and data transmission.
AI-NB25 NB-IoT Module 35 36 37 38 39 40 41 42 43 44 45 46 RESERVED GND VSIM SIM_RST SIM_DIO SIM_CLK SIM_GND GND RESERVED RESERVED RESERVED GND 47 48 RESERVED RESERVED Reserved Reserved 49 50 51 52 53 54 RESERVED RESERVED RESERVED GND RESERVED RESERVED Reserved Reserved Reserved Ground Reserved Reserved O O I/O O Reserved Ground Power supply voltage for external SIM card Reset external SIM card External SIM card data External SIM card clock Ground for External SIM card Ground Reserved Reserved Rese
AI-NB25 NB-IoT Module 3.3 RF Reference Design The RF trace in host PCB connected to the module RF antenna pad should be coplanar waveguide line microstrip line, whose characteristic impedance should be set to 50Ω. It is recommended to use coplanar waveguide line.
AI-NB25 NB-IoT Module 3.4 Antenna Reference Design AI-NB25 module provide an RF antenna (pin2) pad for antenna connection. There are two grounding Pads just as(pin1 & pin3 )on the both sides of the antenna pad in order to give a better grounding. Besides, π-type match circuit is suggested to be used to adjust the balanced of Antenna RF performance, and it is better to keep match circuit close to RF_ANT port of the module. Fig. 4 Antenna matching circuit diagram 3.
AI-NB25 NB-IoT Module For a wireless device with multiple antennas, the power of different antennas is coupled with each other. Antenna isolation is used to measure the power coupling. The power radiated by an antenna might be received by an adjacent antenna, which decreases the antenna radiation Efficiency and affects the running of other devices. To avoid this problem, evaluate the antenna isolation as sufficiently as possible at the early stage of antenna design.
AI-NB25 NB-IoT Module 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 37 Pin Name VSIM Describe Voltage output Voltage current 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.
AI-NB25 NB-IoT Module 5. Electrical Characteristics 5.1 Voltage Supply VBAT power supply must be specified, otherwise the module will be shut down, damaged and so on Pin 29 30 Pin name VBAT VBAT Min 2.1 2.1 Typical 3.3 3.3 Max 3.63 3.63 Unit V V 5.2 Current Supply Item Min Typical PSM mode Idle mode Active TX Active RX Max Unit Condition 5 uA mA mA mA Sleep idle@2.56S TX 23dBm RX 1 330 15 5.
AI-NB25 NB-IoT Module Frequency characteristics Support Bands B1 Rx frequency 2110-2170 MHz Tx frequency 1920-1980 MHz B2 1930-1990 MHz 1850-1910 MHz B3 1805-1880 MHz 1710-1785 MHz B4 2110-2155MHz 1710-1785 MHz B5 869-894 MHz 824-849 MHz B8 925-960 MHz 880-915 MHz B12 729-746 MHz 699 -716MHz B66 2110-2180 MHz 1710-1780MHz B71 617-652 MHz 663-698 MHz B85 728-746 MHz 698-716 MHz Tx power Offset 23 23 23 23 23 23 23 23 23 ±2 ±2 ±2 ±2 ±2 ±2 ±2 ±2 ±2 TX power Support Bands B1 B
AI-NB25 NB-IoT Module 7. Mechanical Properties 7.1 Mechanical dimension drawing Fig. 7 Fig. 8 Sichuan AI-Link Technology Co.,Ltd.
AI-NB25 NB-IoT Module 7.2 Footprint recommended Fig. 9 Dimension（unit：mm） 7.3 Products Picture View Fig. 10 Top view Sichuan AI-Link Technology Co.,Ltd. Fig.
AI-NB25 NB-IoT Module 8. Reel Packing Template 8.1 Reel direction： 8.2 Packing diagram Sichuan AI-Link Technology Co.,Ltd.
AI-NB25 NB-IoT Module 8.3：Label template Module QA AI-NB25 Model： Qty： (RoHS) XXX Number： Inner Box label Module QA Model： Qty： Weight： AI-NB25 (RoHS) XXXX /件 Kg Box No： 2 0 0 0 0 1 Outer Box label Sichuan AI-Link Technology Co.,Ltd.
AI-NB25 NB-IoT Module 9. Soldering Reflow Recommendation Heating zone: temperature: <150 C, time: 60~90 seconds, the slope is controlled at 1~3 C /S. Preheating constant temperature zone: temperature: 150 ~ 200 c, time: 60-120 seconds, the slope is between 0.3-0.8. Reflow soldering area: the peak temperature is 235 C ~250 C (recommended peak temperature is less than 245 C), and the time is 30-70 seconds.
AI-NB25 NB-IoT Module 10. FCC Certification Announcement According to the definition of mobile and fixed device as described in Part 2.1091(b), this device is a mobile device. And the following conditions must be met: 1. This Modular Approval is limited to OEM installation for mobile and fixed applications only.
AI-NB25 NB-IoT Module The user’s manual or instruction manual for an intentional or unintentional radiator shall caution the user that changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.
