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 Installation Model Standard Support Bands Antenna Note B1/B2/B3/B4/B5/B12/B66/B71/B85 External option
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SMD 3GPP Rel-13 AI-NB25 Sichuan AI-Link Technology Co.,Ltd. Add : Anzhou,Industrial Park,Mianyang,Sichuan Fax : +86-0816-2438701 Web site : http://www.changhong.com FAE Tel : +86-0816-2438701 AI-NB25 NB-IoT Module Feedback of customers 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 Sichuan AI-Link Technology Co.,Ltd. page 2 of 20 AI-NB25 NB-IoT Module Record of Modification No Date of modification Main content of modification Reason of modification Serial number of modification 2018-11-26 Initial release 2018-12-16 2019-01-10 2019-01-17 2019-03-19 2019-04-17 2019-04-22 Adding Band 66 in support band list Adding Antenna &
RF reference design Adding Antenna design indicators Changing label to laser marking on shiled cover Adding 3GPPS RF standard to RF specification Adding FCC certification announcement 1 2 3 4 5 6 7 Confirm Nicky.li Nicky.li Nicky.li Nicky.li Nicky.li Nicky.li Nicky.li Sichuan AI-Link Technology Co.,Ltd. page 3 of 20 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 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 232dBm Current consumed 5uA MAX (PSM model) Temperature range
-40C ~ 85C 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 Sichuan AI-Link Technology Co.,Ltd. page 4 of 20 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 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 Sichuan AI-Link Technology Co.,Ltd. page 5 of 20 AI-NB25 NB-IoT Module 2.2 Pin Definition Pin No Pin Name 1 2 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 30 31 32 33 34 GND RF_ANT GND RESERVED RESERVED RESET RESERVED AUX_TXD AUX_RXD RESERVED GND RESERVED RESERVED RESERVED RESERVED VDD_EXT GND RESERVED RESERVED RESERVED ADC RESERVED HST_RXD HST_TXD GND LED RESERVED GND VBAT VBAT GND RTC_ENIG Power Key RESERVED Type I/O I O I I I O O I I I I Describe Comments Ground Module antenna interface, RF output 50 ohm characteristic impedance Ground Reserved Reserved Module reset pin, active low, staging time greater than 100ms Reserved Auxiliary serial port, sending data Auxiliary serial port, receive data Reserved Ground Reserved Reserved Reserved Reserved Reserved Ground Reserved Reserved Reserved Analog-to-digital conversion Reserved Major serial port, receive data, used for AT command and data transmission. Major serial port, sending data, used for AT command and data transmission Ground Network indicator LED Reserved Ground Module power supply, 2.4V ~ 3.63V, Typical voltage 3.3V Module power supply, 2.4V ~ 3.63V, Typical voltage 3.3V Ground Input GPIO port for extended RTC Interrupt Module boot Power Key, drop-down effective Reserved Sichuan AI-Link Technology Co.,Ltd. page 6 of 20 AI-NB25 NB-IoT Module 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 RESERVED GND VSIM SIM_RST SIM_DIO SIM_CLK SIM_GND GND RESERVED RESERVED RESERVED GND RESERVED RESERVED RESERVED RESERVED RESERVED GND 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 Reserved Ground Reserved Reserved Reserved Reserved Reserved Ground Reserved Reserved 3. Antenna Interface The pin 2 is the RF antenna pad. The RF interface has an impedance of 50. 3.1 Pin Definition of the RF_ANT Pin Definition of the RF_ANT table Name GND RF_ANT GND Pin 1 2 3 Description Ground RF antenna pad Ground 3.2 RF Reference Design A reference design for RF is shown as below Sichuan AI-Link Technology Co.,Ltd. page 7 of 20 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 50. It is recommended to use coplanar waveguide line. The characteristic impedance of coplanar waveguide line could been affected by many factors, such as dielectric constant, distance between signal layer and reference ground(H), line width(W), clearance between line and ground(S), copper foil thicknesses(T). The relative relationship between those parameters could be obtained through software like CITS25, shown as follows. Fig. 2 Coplanar Waveguide Line Structure (Software Calculation) The reference ground would be different for different host PCB. It should set the top layer As RF trace and set layer2 or bottom layer as reference ground for four-layer or two-layer PCB, as shown in following figure. Fig. 3 PCB strack recommend Sichuan AI-Link Technology Co.,Ltd. page 8 of 20 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, -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 3.5 Antenna Design Indicators Antenna Efficiency :
Antenna efficiency is the ratio of the input power to the radiated or received power of an antenna. The radiated power of an antenna is always lower than the input power due to the following antenna losses: return loss, material loss, and coupling loss. The efficiency of an antenna relates to its electrical dimensions. The following antenna efficiency (free space) is recommended for AI-NB25 module to ensure high radio performance of the module:
Efficiency of the antenna: 40% (below 960 MHz); 50% (over 1710 MHz) S11 (VSWR) :
S11 indicates the degree to which the input impedance of an antenna matches the reference impedance (50 ). S11 shows the resonance feature and impedance bandwidth of an antenna. Voltage standing wave ratio (VSWR) is another expression of S11. S11 is less important than the efficiency, and S11 has weak correlation to wireless performance. The following S11 value is recommended for the antenna of AI-NB25 module:
S11 of the primary antenna: 6 dB Isolation Sichuan AI-Link Technology Co.,Ltd. page 9 of 20 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. Isolation recommended between the primary antenna and the other antenna: 15 dB Polarization The polarization of an antenna is the orientation of the electric field vector that rotates with time in the direction of maximum radiation. The linear polarization is recommended for the antenna of AI-NB25 module. Gain and Directivity The radiation pattern of an antenna represents the field strength of the radiated. Gain, as another important parameter of antennas, correlates closely to the directivity. The gain of an antenna takes both the directivity and the efficiency of the antenna into account. Gain of the primary/diversity antenna recommended for module 2.5 dBi 4. Work Mode The AI-NB25 module integrates baseband, RF and other units. The following sections briefly describe each function 4.1 Boot up with module When the VBAT power supply input reaches the minimum operating voltage, the external RESET input keeps high level, and the module will start automatically. 4.2 Shut down with module When the VBAT power supply is disconnected, the module will be closed. 4.3 Voltage DC supply The input of the module's power supply uses DC voltage source, and it needs to meet the instantaneous peak current of 0.5A at the time of transmitting pulse. The voltage drop, noise and interference in input voltage will directly affect the performance of the module. To eliminate these interference, ESR low 100uF tantalum capacitors, 100nF, 100pF and 33pF combinations are recommended. Filter capacitor as close as possible to the module. The use of voltage regulator and TVS tube is recommended for module power supply entrance. Sichuan AI-Link Technology Co.,Ltd. page 10 of 20 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 Pin Name 37 VSIM Describe SIM Power Voltage output Voltage current 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 Sichuan AI-Link Technology Co.,Ltd. page 11 of 20 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 PSM mode Idle mode Active TX Active RX Min Typical Max Unit Condition 1 330 15 5 uA mA mA mA Sleep idle@2.56S TX 23dBm RX 5.3 Environmental conditions The ambient temperature of the module must be within the specified range, otherwise it will not guarantee stable performance and normal operation. Temperature range working temp Storage temp Min
-40
-40 Typical 25 25 Max 85 125 Unit 6. Radio Characteristics 6.1 Test Environmental and Diagram Fig. 6 Test structure diagram 6.2 NB-IoT Radio characteristics Sichuan AI-Link Technology Co.,Ltd. page 12 of 20 AI-NB25 NB-IoT Module Frequency characteristics Support Bands B1 B2 B3 B4 B5 B8 B12 B66 B71 B85 Rx frequency 2110-2170 MHz 1930-1990 MHz 1805-1880 MHz 2110-2155MHz 869-894 MHz 925-960 MHz 729-746 MHz 2110-2180 MHz 617-652 MHz 728-746 MHz Tx frequency 1920-1980 MHz 1850-1910 MHz 1710-1785 MHz 1710-1785 MHz 824-849 MHz 880-915 MHz 699 -716MHz 1710-1780MHz 663-698 MHz 698-716 MHz TX power Support Bands Tx power Offset B1 B2 B4 B5 B8 B12 B66 B71 B85 23 23 23 23 23 23 23 23 23 2 2 2 2 2 2 2 2 2 Sensitivity Support Bands Sensitivity Unit B1 B2 B3 B4 B5 B8 B12 B66 B71 B85
-113
-113
-113
-113
-113
-113
-113
-113
-113
-113 dBm dBm dBm dBm dBm dBm dBm dBm dBm dBm Sichuan AI-Link Technology Co.,Ltd. page 13 of 20 AI-NB25 NB-IoT Module 7. Mechanical Properties 7.1 Mechanical dimension drawing Fig. 7 Top viewunitmm Fig. 8 Bottom viewunitmm Sichuan AI-Link Technology Co.,Ltd. page 14 of 20 AI-NB25 NB-IoT Module 7.2 Footprint recommended Fig. 9 Dimensionunitmm 7.3 Products Picture View Fig. 10 Top view Fig. 11 Bottom view Sichuan AI-Link Technology Co.,Ltd. page 15 of 20 AI-NB25 NB-IoT Module 8. Reel Packing Template 8.1 Reel direction 8.2 Packing diagram Sichuan AI-Link Technology Co.,Ltd. page 16 of 20 AI-NB25 NB-IoT Module 8.3Label template Module QA Model AI-NB25
(RoHS) Qty XXX Number Inner Box label Module QA Model AI-NB25
(RoHS) Qty XXXX Weight /
Kg Box No 2 0 0 0 0 1 Outer Box label Sichuan AI-Link Technology Co.,Ltd. page 17 of 20 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. Cooling zone: temperature: 217 C ~170 C, slope at 3~5 C /S The solder is tin silver copper alloy lead-free solder / Sn&Ag&Cu Lead-free solder (SAC305). Note: The product can withstand the limit temperature of 255 degrees and 5 seconds. In order to ensure the product quality, the reflux curve should seek a balance between PCB and components without damaging the quality of solder joints, and should be carried out within the above curve range. Sichuan AI-Link Technology Co.,Ltd. page 18 of 20 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. The antenna installation and operating configurations of this transmitter, including any applicable source-based time- averaging duty factor, antenna gain and cable loss must satisfy MPE categorical Exclusion Requirements of 2.1091. 2. The EUT is a module; maintain at least a 20 cm separation between the EUT and the users body. And must not transmit simultaneously with any other antenna or transmitter. 3. A label with the following statements must be attached to the host end product:
This device contains FCC ID: 2AOKI-AI-NB25 4. To comply with FCC regulations limiting both maximum RF output power and human exposure to RF radiation, maximum antenna gain (including cable loss) must not exceed:
LTE(NB-IOT) B2/B4/B12/B66/B71 <0.95dBi 5. This module must not transmit simultaneously with any other antenna or transmitter. 6. The host end product must include a user manual that clearly defines operating requirements and conditions that must be observed to ensure compliance with current FCC RF exposure guidelines. For portable devices, in addition to the conditions 3 through 6 described above, a separate approval is required to satisfy the SAR requirements of FCC Part 2.1093 If the device is used for other equipment, separate approval is required for all other operating configurations, including portable configurations with respect to 2.1093 and different antenna configurations. For this device, OEM integrators must be provided with labeling instructions of finished products. Please refer to Products Picture View FCC ID, Page 15/20 last two paragraphs:
A certified module has the option to use a permanently affixed label, or an electronic label. For a permanently affixed label, the module must be labelled with an FCC ID - (see 2.2 Page 15/20 above). The OEM manual must provide clear instructions explaining to the OEM the labelling requirements, options and OEM user manual instructions that are required (see next paragraph). For a host using a certified module with a standard fixed label, if (1) the moduless FCC ID is not visible when installed in the host, or (2) if the host is marketed so that end users do not have straight forward commonly used methods for access to remove the module so that the FCC ID of the module is visible;
then an additional permanent label referring to the enclosed module:Contains Transmitter Module FCC ID:2AOKI-AI-NB25 or Contains FCC ID: 2AOKI-AI-NB25 must be used. The host OEM user manual must also contain clear instructions on how end users can find and/or access the module and the FCC ID. The final host / module combination may also need to be evaluated against the FCC Part 15B criteria for unintentional radiators in order to be properly authorized for operation as a Part 15 digital device. Sichuan AI-Link Technology Co.,Ltd. page 19 of 20 AI-NB25 NB-IoT Module The users 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. In cases where the manual is provided only in a form other than paper, such as on a computer disk or over the Internet, the information required by this section may be included in the manual in that alternative form, provided the user can reasonably be expected to have the capability to access information in that form. This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions:
(1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. Changes or modifications not expressly approved by the manufacturer could void the users authority to operate the equipment. To ensure compliance with all non-transmitter functions the host manufacturer is responsible for ensuring compliance with the module(s) installed and fully operational. For example, if a host was previously authorized as an unintentional radiator under the Declaration of Conformity procedure without a transmitter certified module and a module is added, the host manufacturer is responsible for ensuring thatafter the module is installed and operational the host continues to be compliant with the Part 15B unintentional radiator requirements. Sichuan AI-Link Technology Co.,Ltd. page 20 of 20