FCC ID: 2AF6B-RAK4270H LoRa Module

Specification for RAK4270 LoRa Module WisDuo-LoRa Series Version V1.2 | Apr2020 www.RAKwireless.com Visit our web site for more document. Table of Contents 1. General Overview ................................................................................................... 3 Introduction ................................................................................................................................. 3 Main Features ............................................................................................................................. 3 2. RAK4270 LoRa Module ............................................................................................... 4 Device Overview ........................................................................................................................ 4 Supported LoRaWAN bands ................................................................................................. 4 Block Diagram ............................................................................................................................ 5 Pin Definition & Pin Out .......................................................................................................... 5 Power Consumption ................................................................................................................. 7 Recommended Circuit ............................................................................................................. 7 SWD programming Port ..................................................................... 8 UART ports ............................................................................................... 8 I2C port ................................................................................................ 9 RF port ................................................................................................. 9 VDD power in ............................................................................................... 9 Mechanical Dimensions ......................................................................................................... 10 Recommended Footprint ...................................................................................................... 11 Recommended Reflow Profile ............................................................................................. 12 Customer Support ................................................................................................................ 12 3. Revision History ................................................................................................... 13 4. Document Summary ............................................................................................ 13 2 1. General Overview Introduction The RAK4270 LoRa Module includes a STM32L071 MCU and a SX1262 LoRa chip, which supports 8 spreading factors (SF5 ~ SF12) and signal bandwidth that can be adjusted between 7.8 kHz to 500 kHz. The module complies with the LoRaWAN 1.0.2 protocol, so it can be used for implementing LoRa networks or Lora point to point communications. The module is suitable for various applications that require long range data acquisition and low power consumption, such as:

smart meters, supply chain and logistics tracking, agricultural sensors, smart cities, etc This module is expected to be controlled by an external controller through its UART interface by sending a set of AT commands. These AT commands control not only the state of this module but also set the LoRaWan communication parameters and payloads

(see RAK AT Command Manual). Main Features Industry. LoRa module is suitable for applications in Smart City, Smart Agriculture, Smart Compact form factor: 15 x 15.5 x 2.5 mm (LxWxH). 20 pin stamp pad for PCB SMT board-to-board soldering. I/O ports: UART/I2C/GPIO. AT commands control interface Temperature range: -40C to +85C Supply voltage: 2.0 to 3.6V Frequency Bands 433MHz(EU)/ 470-510MHz(CN)/ 865-867MHz(IN)/ 863870MHz

(EU)/ 500kHz: 903914.2MHz,125kHz:902.3-914.9MHz(US)/915-928MHz(AU)/ 920-

923MHz(KR) / 920- 923MHz(AS) LoRa bandwidth range of 7.8 kHz to 500 kHz, SF5 to SF12, BR=0.018~62.5 kb/s Ultra-low power Consumption: 1.5uA in sleep mode Arm Cortex-M0+ 32-bit RISC core. 128 kbytes flash memory with ECC 3 20 kbytes RAM 6 kbytes of data EEPROM with ECC Compliance with [TBC][add regulations here]

2. RAK4270 LoRa Module Device Overview Figure 1 shows the top view of the RAK4270 LoRa module. The dimensions of the module are 15 x 15.5 x 2.5 mm. Figure 1 | RAK4270 LoRa module Supported LoRaWAN bands The RAK4270 LoRa module supports the high LoRaWAN bands (refer to the Table 1) Frequency (MHz) Module RAK4270(L) RAK4270(H) North America Region Europe China Indian Europe Australia Korea Asia EU433 CN470 IN865 EU868 US915 AU915 KR920 AS923 Table 1 | Operating Frequencies 4 Pin Definition & Pin Out The Figure 3 shows the pinout of the RAK4270 LoRa module. Figure 2 | Pinout 5 The table below shows the pin definition of the RAK4270 LoRa Module. Pin Name I/O Description Alternate functions 1 UART2_RX I This UART port is used USART1_RX, as an AT command port I2C1_SDA 2 UART2_TX O This UART port is used MCO, USART1_TX, as an AT command port I2C1_SCL, I2C3_SMBA

(STM32L071KBU6 PA3)

(STM32L071KBU6 PA2) 3 UART2_DE I/O PA1) GPIO (STM32L071KBU6 4 UART1_TX I/O used as an AT This UART port can be command port and an upgrade port

(STM32L071KBU6 PA9) SPI1_MOSI,EVENTOUT, USART1_RTS_DE, COMP2_OUT TIM21_CH1,TIM2_CH3, USART2_TX,LPUART1_TX, COMP2_OUT,COMP2_INM, ADC_IN2 5 UART1_RX I/O used as an AT command USART2_RX,LPUART1_RX, This UART port can be TIM21_CH2,TIM2_CH4, port and an upgrade port COMP2_INP,ADC_IN3

(STM32L071KBU6 PA10) EVENTOUT,TIM2_CH2,USART2_RT 6 UART1_DE I/O UART(Reserved) TIM21_ETR, General GPIO or S_DE,

(STM32L071KBU6 PA12) USART4_RX,COMP1_INP, ADC_IN1 7 SWDIO I/O SWDIO, LPUART1_RX Programming

(STM32L071KBU6 PA13) 8 SWCLK I/O Programming SWCLK, USART2_TX,

(STM32L071KBU6 PA14) LPUART1_TX 9 I2C_SCL I/O I2C interface USART1_TX,I2C1_SCL,

(STM32L071KBU6 PB6) LPTIM1_ETR,COMP2_INP 10 I2C_SDA I/O I2C interface

(STM32L071KBU6 PB7) 11 GND

Ground 12 RF I/O out by IPEX 13 GND 14 GND

Ground Ground RF port (reserved), default RF USART1_RX,I2C1_SDA, LPTIM1_IN2,USART4_CTS, COMP2_INP,VREF_PVD_IN

15 ANT_SW I/O PA11 leave it un-connect on mainboard 16 PB4 I/O STM32L071KBU6 PB4 USART1_CTS,SPI1_MISO, TIM3_CH1,I2C3_SDA 6 17 PA8 I/O STM32L071KBU6 PA8 18 MCU_NRST I/O MCU reset

(STM32L071KBU6 NRST)

USART1_CK,I2C3_SCL, MCO,EVENTOUT 19 GND 20 VDD

Ground DC3V3 Ground Supply voltage 2.0~3.3V 7 Table 2 | Pin Definitions Power Consumption Frequency Output Power 125kHz: 902.3-914.9MHZ 10.19dBm 500kHz: 903.0-914.2MHZ 11.41dBm Recommended Circuit SWD programming Port In order to upgrade the firmware, the SWD (Serial Wire Debug) interface must be used. A 5 pin JLINK cable has to be connected to the SWD port. These pins are:

3v3, SWDIO, SWCLK, and MCU_NRST. UART ports There are two UART ports on RAK4270 module. UART2 (pin1 and pin2) can be used as the command port, while the UART1 (pin4 and pin5) can be used both as command port and firmware upgrade port. It is recommended to connect the UART2 port to an external MCU and reserve UART1 for debugging and or future firmware upgrade purposes. The serial communication parameters to connect to the UART2 port are: 115200 / 8-

N-1. 8 The RAK4270 exposes a I2C port, in which the SDA line is assigned to the pin9, and SCL line is assigned to pin10. This I2C port allows to control additional slave sensors with the RAK4270 using I2C protocol. The RAK4270 will be the master. If the I2C port is used, then external pull-up resistors mus added to the SDA and SCL lines. The recommended value of the resistors are 10 kOhm. I2C port RF port The RAK4270 module expose two types of RF antenna: IPEX and PAD. The most straightforward way is to use the IPEX antenna port. In such case, you just to connect the antenna to the IPEX connector on the module directly. In the other hand, for specific needs, customers can design a PCB trace antenna, Chip antenna, SMA antenna, or spring type antenna. In the latter case, the customer should use the PAD type antenna port expose by this module. The external antenna should be matched to the 50 Ohm RF transmission line. VDD power in It is recommended to add 4 decoupling capacitors near the module at the entrance of the power supply pin. The recommended values of the capacitor are C1 =10uF, C2=10uF, C3=100nF, C4=100nF. 1 Mechanical Dimensions The Figure 8 shows the mechanical dimension of the RAK4270 LoRa module. Figure 3 | Mechanical Dimensions 10 Recommended Footprint Figure 4 | Recommended PCBfootprint 11 Recommended Reflow Profile Figure 5 | Recommended ReflowProfile Standard conditions for reflow soldering:

Pre-heating Ramp (A) (Initial temperature: 150

): 1~2.5

/sec;

Soaking Time (T2) (150

~180

): 60sec~100sec;

Peak Temperature (G): 230~250

Reflow Time (T3) (>220

): 30~60 sec;

Ramp-up Rate (B): 0~2.5

/ sec;

Ramp-down Rate (C): 1~3

/ sec. Customer Support Please contact us if you need technical support or need more information. Support center:

https://forum.rakwireless.com/

Email us:

info@rakwireless.com 12 3. Revision History Revision Description 1.0 1.1 Initial version First review Date 2020-04-02 2020-04-07 4. Document Summary Prepared by Checked by Approved by Hairui Penn & Vladislav About RAKwireless:

RAKwireless is the pioneer in providing innovative and diverse cellular and LoRa connectivity solutions for IoT edge devices. It's easy and modular design can be used in 13 different IoT applications and accelerate time-to-market. For more information, please visit RAKwireless website at www.rakwireless.com. FCC Warning 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;

(2) This device must accept any interference received, including interference that may cause undesired operation. Any Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. INTEGRATION INSTRUCTIONS 1. This module has been tested and found to comply with the FCC Part15.247 for Modular Approval. 2. 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. This modular should be installed and operated with minimum distance 20 cm between the radiator& your body. 3. The U.FL connector antenna has been approved for the modular. The maximum antenna gain are 2.3dBi (White Antenna)& 2.0dBi (Black Antenna). For situations where the host manufacturer is responsible for an external connector, the integration instructions shall inform the installer that a unique antenna connector must be used on the Part 15 authorized transmitters used in the host product. 4. When the module is installed in the host device, the FCC ID label must be visible through a window on the final device or it must be visible when an access panel, door or cover is easily removed. If not, a second label must be placed on the outside of the final device that contains the following text: Contains FCC ID: 2AF6B-RAK4270H. 5. The Shenzhen Rakwireless Technology Co., Ltd. uses various test mode programs for test set up which operate separate from production firmware. Host integrators should contact Shenzhen Rakwireless Technology Co., Ltd. for assistance with test modes needed for module/host compliance test requirements. 6. The Shenzhen Rakwireless Technology Co., Ltd. modular transmitter is only FCC authorized for the FCC Part15.247 listed on the grant, and that the host product manufacturer is responsible for compliance to any other FCC rules that apply to the host not covered by the modular transmitter grant of certification. If the grantee markets their product as being Part 15 Subpart B compliant (when it also contains unintentional-radiator digital circuity), then the grantee shall provide a notice stating that the final host product still requires Part 15 Subpart B compliance testing with the modular transmitter installed.

Bay Area Compliance Laboratories Corp. (Shenzhen) Project No.: RSZ200709005-RF EXHIBIT A - FCC ID LABEL AND LOCATION FCC ID Label FCC ID Label Location Information The label shown shall be permanently affixed at a conspicuous location on the device and be readily visible to the user at the time purchase (Labeling requirements per 2.925)

Shenzhen Rakwireless Technology Co., Ltd. Address: Room 506, Bldg B, New Compark, Pingshan First Road, Taoyuan Street, XiLi town Nanshan District, Shenzhen, China Email: ye.duiyu@rakwireless.com Tel: +8675586152201 FCC Authorization 2020-08-06 FEDERAL COMMUNICATIONS COMMISSIONS Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Subject: Agent Authorization To whom it may concern:

We (Shenzhen Rakwireless Technology Co., Ltd.), the undersigned, hereby authorize Bay Area Compliance Laboratories Corporation to act on its behalf in all matters relating to application for Equipment authorization, including the signing of all documents relating to these matters. All acts carried out by Bay Area Compliance Laboratory Corporation on our behalf shall have the same effect as our own action. We, the undersigned, hereby certify that we are not subject to a denial of federal benefits, that includes FCC benefits, pursuant to Section 5301 of the Anti-Drug Abuse Act of 1988, 21 U.S.C. 862. This authorization is valid until further written notice from the applicant. Sincerely, Signature:

duiye ye Title: Engineer QA-FR-170-B

Shenzhen Rakwireless Technology Co., Ltd. Address: Room 506, Bldg B, New Compark, Pingshan First Road, Taoyuan Street, XiLi town Nanshan District, Shenzhen, China Email: ye.duiyu@rakwireless.com Tel: +8675586152201 FCC Confidential Authorization 2020-08-06 FEDERAL COMMUNICATIONS COMMISSIONS Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Subject: Confidentiality Request regarding application for certification of FCC ID: 2AF6B-RAK4270H In accordance with Sections 0.457 and 0.459 of the Commissions Rules, (Shenzhen Rakwireless Technology Co., Ltd. ) hereby requests long-term confidential treatment of information accompanying this application as outlined below:

Block Diagram Schematics Operation Description The above materials contain proprietary and confidential information not customarily released to the public. The public disclosure of these materials provides unjustified benefits to its competitors in the market. Sincerely, Signature:

duiye ye Title: Engineer

Shenzhen Rakwireless Technology Co., Ltd. Address: Room 506, Bldg B, New Compark, Pingshan First Road, Taoyuan Street, XiLi town Nanshan District, Shenzhen, China Email: ye.duiyu@rakwireless.com Tel: +8675586152201 Modular Approval Letter Date: 2020-08-31 FEDERAL COMMUNICATIONS COMMISSIONS Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Dear Application Examiner, We, Shenzhen Rakwireless Technology Co., Ltd. is submitting this application for certification of product named as LoRa Module, Model Numbers: RAK4270(H)

(FCC ID: 2AF6B-RAK4270H). It is seeking modular approval. The radio meets the requirements for modular approval as detailed in FCC 15.212. Compliance to each of the requirements is described below:

1. The modular transmitter must have its own RF shielding. Yes, it is fulfilled. The radio portion of the module has its own RF shielding. The shielding is installed at the factory. Please see the EUT photos. 2. The modular transmitter must have buffered modulation/data inputs. Yes, it is fulfilled. The EUT has buffered data inputs to insure compliance with Part 15 requirements under conditions of excessive data rates or over modulation. Please see the Schematics exhibit. 3. The modular transmitter must have its own power supply regulation. Yes, it is fulfilled. The EUT has its own power supply regulation to insure compliance. 4. The modular transmitter must comply with the antenna requirements of Section 15.203 and 15.204(c). Yes. The EUT has a external rod antenna design. 5. The modular transmitter must be tested in a stand-alone configuration. Yes, it is fulfilled. The EUT was tested in a stand-alone configuration. 6. The modular transmitter must be labeled with its own FCC ID number. Yes, it is fulfilled. The module will be labeled with its own FCC ID number. Please see FCC ID label & location exhibit. 7. The modular transmitter must comply with any specific rule or operating requirements applicable to the transmitter and the manufacturer must provide adequate instructions along with the module to explain any such requirements. Yes, it is fulfilled. The necessary explanation to be complied with this requirement is contained in the user manual, and please refer to the User manual. 8. The modular transmitter must comply with any applicable RF exposure requirements. Yes, it is fulfilled. The module will comply with all applicable RF exposure requirements in its intended configuration/integration in a host. Please contact me if you have additional questions. Your attention to this matter is greatly appreciated. Sincerely Yours, Signature:

duiye ye Title: Engineer