FCC ID: 2AOE2-REX3B21 Zigbee Module

Data Sheet of ZigBee Module REX3B21 V5.0 Copyright The information contained in this document is the proprietary information of Zhejiang Rexense Technology Co., Ltd. (hereinafter referred to as Rexense or the company). All rights reserved. Without the written permission of the company, the content of the document shall not be disclosed to the company's employees, agents, partners or any unauthorized parties in any form without authorization, copying or dissemination of this document is prohibited. Our company shall reserve rights to the legal responsibility again any users violation of copyright protection. Document Change List V1.0.0 V5.0.0 20170401 20190919 Initial version Update to MG21 series chips 1 2 Content 1. Product Introduction .......................................................................................................................... 3 1.1 Introduction ..................................................................................................................................... 3 1.2 Application ....................................................................................................................................... 3 1.3 Main Characteristics ....................................................................................................................... 3 1.4 Product Advantage .......................................................................................................................... 4 1.5 Abbreviations................................................................................................................................... 4 1.6 Related Documents ........................................................................................................................ 5 2. Product Overview .............................................................................................................................. 6 2.1 Overview ......................................................................................................................................... 6 3. Technical Specification ...................................................................................................................... 7 3.1. Electrical Specification ................................................................................................................... 7 3.1.1. Electrical Specification ......................................................................................................... 7 3.1.2. Power Consumption ............................................................................................................ 7 3.1.3. RF Electrical Characteristics ............................................................................................... 8 3.1.4. Processor Characteristics ................................................................................................... 8 3.1.5. Module Interface Characteristics ......................................................................................... 8 3.2. Physical/Ambient Characteristics .................................................................................................. 9 3.3. Pin Configuration ........................................................................................................................... 9 3.4 Antenna Specification.................................................................................................................... 12 3.4.1 On Board PCB Antenna ...................................................................................................... 12 3.4.2 U.FL Antenna Socket .......................................................................................................... 12 3.5. RF Performance ........................................................................................................................... 13 3.6. Soldering Temperature for Module .............................................................................................. 14 3.7. Packing ........................................................................................................................................ 16 4. Ordering Information ....................................................................................................................... 17 5. Contact Us ...................................................................................................................................... 18 3 1. Product Introduction 1.1 Introduction REX3B21 is a low-power ZigBee module with high sensitivity and compact in dimension. Based on EFR32 platform of SiliconLabs, this module conforms to IEEE 802.15.4 specification and ZigBee3.0 protocol standard. It has been widely used in applications of smart home, building automation and industrial monitoring. By utilizing this module, much time and energy will be saved during the development work. 1.2 Application REX3B21 module conforms to IEEE 802.15.4 specification and ZigBee3.0, supports the mesh network which is self-healing and self-assembling, optimizes the network rate and power consumption. This module supports the setting and configuration as below:

Standard ZigBee 3.0 Application of module, included but not limited to:

Smart home Light control Security system Air quality monitoring Smart lock Motorized curtain Air-conditioning, heating and ventilation Scenario automation Building automation and monitoring HVAC monitoring and control Industrial monitoring Wireless meter reading 1.3 Main Characteristics Dimension20.4*14.8*2.5mm Max output power:14dBm Max receiving sensitivity: -102.5dBm(Zigbee) Reliable communication distance: 1000mview of sight distance 15 GPIOs can be configured for various functional interfaces according to application 4 Multiple antenna options Extreme low power consumption Sleep mode<5.0A Receiving mode9.4mA (Zigbee) GPIO External interrupts 12 bytes precision ADC sampling channel USART Hardware flow control TWI interface UART / SPI / I2C interface PWM output 1.4 Product Advantage Small Package fits small devices well. Advanced link budget in the industry Outstanding battery longevity Rich storage resource for various software application Powerful mesh network management ability With development kit easy to use and cost-effective ISM band license free 1.5 Abbreviations ADC GPIO HVAC TWI IEEE ISM JTAG MAC PCB RAM RF Analog-to -Digital Converter General Purpose Input /Output Heating, Ventilating and Air Conditioning Inter-Integrated Circuit Institute of Electrical and Electronics Engineers Industrial, Scientific and Medical radio band standard interface Medium Access Control layer Printed Circuit Board Random Access Memory Radio Frequency Digital interface for debugging of embedded device, also known as IEEE 1149.1 5 RTS/CTS Request to Send/ Clear to Send RX SMA SPI TX Receiver Surface Mount Assembly Serial Peripheral Interface Transmitter UART Universal Asynchronous Receiver/Transmitter ZigBee PRO Wireless networking standards targeted at low-power applications 1.6 Related Documents

[1] ZigBee 3.0 The Open, Global Standard for the Internet of Things December 2, 2014 6 2. Product Overview 2.1 Overview REX3B21 is a compact IOT module, higher sensitivity and lower power. It conforms to IEEE 802.15.4 and ZigBee 3.0 standard protocol. Based on EFR32 platform of SiliconLabs, this module has outstanding RF characteristics, lower power consumption, and powerful processor core. REX3B21 module conforms to the FCC, ISED, CE, and RoHS, which can be applied to various devices in different environments. At the same time, our company also provides a complete set of development and evaluation kits, users can choose kits of different versions for testing and development according to their requirement 7 3. Technical Specification 3.1. Electrical Specification 3.1.1. Electrical Specification Table 3-1. Absolute Maximum Ratings Parameter Module input voltageVCC Pin voltage (except ADC pin) ADC Pin voltage Data of maximum drive current of all I/Os Maximum RF signal receiving density of chips Min 1.71V

-0.3V 0V VDD_PADS+0.3 Max 3.8V 3.3V 50 mA

+14 dBm Note: exceeding the absolute maximum ratings may damage module. In any case, the user shall not violate the absolute maximum ratings listed in the previous table. If there is a violation, it may cause irreparable damage to the module. Table 3-2. Test conditions (unless otherwise agreed), VCC = 3.3V, temperature = 25C Parameter Range 9.4 186 5.0 14

-102.5 Unit mA mA A dBm dBm 3.1.2. Power Consumption Receiving current

@14dBmTransmitting current Sleeping current Transmitting power 99%Receiving sensitivity 3.1.3. RF Electrical Characteristics 8 Table 3-3. RF Electrical Characteristics Parameter Frequency range Quantity of Channels Channel spacing Transmitting power Receiving sensitivity Max transmitting rate Rated Input / Output Impedance 3.1.4. Processor Characteristics Range 2400~2483.5 16 5 14

-102.5 250 50 Unit MHz MHz dBm dBm kbps Table 3-4. Processor Characteristics Parameter Processor core Max operating frequency 3.1.5. Module Interface Characteristics 32bit ARM-M33 80MHz Table 3-5. Module Interface Characteristics Parameter Test Conditions The resolution / conversion time of the analog Half-duplex mode Range 230400 12/4096

>1 3.3 0 - VREF 1000 Unit bps Bits/s M KHz V V V V

-8/ 4 mA

-8/ 4 mA 0 ~ 0.18*VCC 0.82*VCC ~ VCC 32.768 KHz UART Max baud rate channel Analog input impedance Analog reference voltage (VREF) Analog input voltage I2C bus maximum clock frequency GPIO output voltage (logic 0) GPIO output voltage (logic 1) Real-time clock frequency 9 3.2. Physical/Ambient Characteristics Table 3-6. Physical/Ambient Characteristics Parameter Physical size Weight Working temperature Relative working Humidity 3.3. Pin Configuration Value 20.4*14.8*2.5mm

-40C to +85Cdefault

<1g

<95%

Note Figure3-1. Dimensions Figure 3-3. Pin Definition 10 Figure3-2. Footprint Table 3-7. Pin Description No. of No. of QFN32 module pins package pins Pin signal Direction Pin specification 11 PC0 PC1 PA5 PA6 3.3V PD0 GND PD1 PD2 PA4 PA3 PA0 PB1 PC4 PA1 PC5 PA2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 10252627 110 1 2 22 23 32 31 30 21 20 17 15 5 18 6 19 9 110 GND RESET I/O I/O I/O I/O I/O I I I/O I/O I/O I/O I/O I/O I/O IO IO IO I I GPIO GPIO GPIO; TXD GPIO; RXD VCC GPIO GND GPIO GPIO GPIO GPIO GPIO GPIO GPIO GPIO GPIO; SWCLK GPIO; SWDIO GND RESET 12 3.4 Antenna Specification 3.4.1 On Board PCB Antenna REX3B21 has an on board PCB antenna. Notes for using PCB antenna:

Avoid placing module in a metal shell. Keep metal object from the PCB antenna (at least 1cm above, 2.7cm plus recommend). Do not keep module nearby the devices with electromagnetic radiation source, such as transformers. The design of a user's PCB should prevent the modules PCB antenna from the interference of its components, traces and bottom. The basic principles are:

No traces, bottom around the PCB antenna with no other components placed The PCB antenna shall be out of PCB board Do not cover the PCB antenna with metal shell Figure 3-4. PCB Antenna Placement Components, traces, copper allowed No components around, or traces or copper at bottom. Preferred is hollow on top or at bottom of PCB antenna. 3.4.2 U.FL Antenna Socket Figure 3-5. U.FL Antenna socket U.FL Antenna Socket

. 3.5. RF Performance 13 Figure 3-8. Carrier Signal Figure 3-9. Modulation Signal 14 3.6. Soldering Temperature for Module The max temperature for soldering module shall be within 237-245 in 20s. 15 3.7. Packing 16 4. Ordering Information 17 REX 3 B 21 Manufacturer REX=REXENSE Series 3=Zigbee Packaging Type M = Mini P = Full GPIO Pin Core 21 = EFR32MG21 B = On board PCB antenna (This) 18 5. Contact Us Zhejiang Rexense IoT Technology Co., Ltd. Add 6F, Building No.4, No.6 Longzhou Road, Yuhang District,Hangzhou,311100, China Tel+86-571-28081053 Email: intl@rexense.com Webwww.rexense.com 19 This device complies with part 15 of the FCC Rules. Operation is subject to the following two

(1) This device may not cause harmful interference, and

(2) this device must accept any interference received, including interference that may cause FCC Compliance Notice conditions:

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. This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

Reorient or relocate the receiving antenna. Increase the separation between the equipment and receiver. Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. Consult the dealer or an experienced radio/TV technician for help. FCC Radiation Exposure Statement This equipment complies with FCC radiation exposure limits set forth for an uncontrolled This transmitter must not be co-located or operating in conjunction with any other antenna or This equipment should be installed and operated with minimum distance 20cm between the environment . transmitter. radiator& your body. ISEDC RSS warning This device complies with Innovation, Science and Economic Development Canada Compliance licenceexempt RSS standard (s). Operation is subject to the following two conditions: (1) this device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired operation of the device. Le prsent appareil est conforme aux CNR d'Innovation, Sciences et Dveloppement conomique Canada 20 applicables aux appareils radio exempts de licence. L'exploitation est autorise aux deux conditions suivantes:

(1) l'appareil ne doit pas produire de brouillage, et brouillage est susceptible d'en compromettre le fonctionnement. ISEDC Radiation Exposure Statement:

(2) l'utilisateur de l'appareil doit accepter tout brouillage radiolectrique subi, mme si le This equipment complies with ISEDC RF radiation exposure limits set forth for an uncontrolled This transmitter must not be colocated or operating in conjunction with any other antenna or Cet quipement est conforme avec ISEDC les limites d'exposition aux rayonnements dfinies pour environment. transmitter. IC exposition aux radiations:

un contrl environnement. Cet metteur ne doit pas tre colocaliss ou fonctionner en conjonction avec une autre antenne Any changes or modifications not expressly approved by the party responsible for compliance users authority to operate the equipment. Tous les changements ou modifications non expressment approuve par le responsible de la ou metteur. could void the conformit pourrait vider lutilisateur est habilit exploiter lquipemen. If the FCC identification number is not visible when the module is installed inside another device, then the outside of the device into which the module is installed must also display a label referring to the enclosed module. This exterior label can use wording such as the following: Contains Transmitter Module FCC ID: 2AOE2-REX3B21 or Contains FCC ID: 2AOE2-REX3B21 The outside of final products that contains this module device must display a label referring to the enclosed module. This exterior label can use wording such as:

Contains Transmitter Module IC: 22670-REX3B21,or Contains IC: 22670-REX3B21, Any similar wording that expresses the same meaning may be used Instructions d'tiquetage IC: L'extrieur des produits finis contenant ce module doit afficher une tiquette faisant rfrence au module inclus. Cette tiquette extrieure peut utiliser des libells tels que: contient le module metteur IC: 22670-REX3B21ou contient: IC: 22670-REX3B21 , tout libell similaire exprimant le mme sens peut tre utilis 21 Integration instructions for host product manufacturers according to KDB 996369 D03 OEM Manual v01 2.2 List of applicable FCC rules CFR 47 FCC PART 15 SUBPART C has been investigated. It is applicable to the modular. 2.3 Specific operational use conditions This module is stand-alone modular. If the end product will involve the Multiple simultaneously transmitting condition or different operational conditions for a stand-alone modular transmitter in a host, host manufacturer have to consult with module manufacturer for the installation method in end system. 2.4 Limited module procedures Not applicable 2.5 Trace antenna designs Not applicable 2.6 RF exposure considerations To maintain compliance with FCCs RF Exposure guidelines, this equipment should be installed and operated with minimum distance of 20cm from your body. 2.7 Antennas This radio transmitter FCC ID: 2AOE2-REX3B21 has been approved by FederalCommunications 22 Commission to operate with the antenna types listed below, with the maximum permissible gain indicated. Antenna types not included in this list that have a gain greater than the maximum gain indicated for any type listed are strictly prohibited for use with this device. 2.8 Label and compliance information The final end product must be labeled in a visible area with the following " Contains FCCID:2AOE2-REX3B21 2.9 Information on test modes and additional testing requirements Host manufacturer is strongly recommended to confirm compliance with FCC requirements for the transmitter when the module is installed in the host. 2.10 Additional testing, Part 15 Subpart B disclaimer Host manufacturer is responsible for compliance of the host system with module installed with all other applicable requirements for the system such as Part 15 B. ISED Important Note:

In the event that these conditions cannot be met (for example certain laptop configurations or co-location with another transmitter), then the Canada authorization is no longer considered valid 23 and the ISED cannot be used on the final product. In these circumstances, the OEM integrator will be responsible for re-evaluating the end product (including the transmitter) and obtaining a separate Canada authorization. Any company of the host device which install this modular with limit modular approval should perform the test of radiated emission and spurious emission according to RSS-247 and RSSGen requirement, only if the test result comply with RSS-247 and RSS-Gen requirement, then the host can be sold legally. Note Importante :

lgalement. End Product Labeling Dans le cas o ces conditions ne peuvent tre satisfaites (par exemple pour certaines configurations d'ordinateur portable ou de certaines co-localisation avec un autre metteur), l'autorisation du Canada n'est plus considr comme valide et l' ISED ne peut pas tre utilis sur le produit final. Dans ces circonstances, l'intgrateur OEM sera charg de rvaluer le produit final (y compris l'metteur) et l'obtention d'une autorisation distincte au Canada. toute entreprise de l'hte qui installent ce dispositif modulaire avec limite approbation devrait effectuer l'essai des modules et des rayonnements non essentiels des missions rayonnes selon rss-247 et le cnr -

gen, seulement si le rsultat d'essai conforme rss-247 et le cnr - gen, puis l'hte peut tre vendu The final end product must be labeled in a visible area with the following: Contains 24 IC:22670-REX3B21. Plaque signaltique du produit final Le produit final doit tre tiquet dans un endroit visible avec l'inscription suivante: Contient des IC:22670-REX3B21. Manual Information to the End User The OEM integrator has to be aware not to provide information to the end user regarding how to install or remove this RF module in the users manual of the end product which integrates this The end user manual shall include all required regulatory information/warning as show in this module. manual. Manuel d'information l'utilisateur final L'intgrateur OEM doit tre conscient de ne pas fournir des informations l'utilisateur final quant la faon d'installer ou de supprimer ce module RF dans le manuel de l'utilisateur du produit final qui intgre ce module. Le manuel de l'utilisateur final doit inclure toutes les informations rglementaires requises et avertissements comme indiqu dans ce manuel. This radio transmitter [22670-REX3B21] has been approved by Innovation, Scienceand Economic Development Canada to operate with the antenna types listed below, It has an antenna with the maximum antenna gain is 1.78dBi. 25 Antenna types not included in this list that have a gain greater than the maximum gain indicated for any type listed are strictly prohibited for use with this device. Cet metteur radio [22670-REX3B21] a t approuv par Innovation, Science et dveloppement conomique Canada pour fonctionner avec les types dantenne numrs ci-dessous. Il dispose d'une antenne avec une prise le gain maximum d'antenne est de1.78 dBi. Les types d'antennes non inclus dans cette liste qui ont un gain suprieur au gain maximum indiqu pour tout type rpertori sont strictement interdits pour l'utilisation avec cet appareil.

Company Name: Zhejiang Rexense IoT Technology Co., Ltd. Address: 6F, Building 4, No.6 Longzhou Road, Yuhang District, Hangzhou, China Telephone: 0086-571-28081053 FAX:0086-571-28081053 Email: marketing@rexense.com Date: 2022-4-11 ATTESTATION LETTER We, Zhejiang Rexense IoT Technology Co., Ltd. hereby declare that:

Product Name: Zigbee Module Model Number: REX3B21 FCC ID: 2AOE2-REX3B21 The chip (model: EFR32MG21) used in the product support Zigbee, Thread and Bluetooth Low Energy (Bluetooth 5), but Thread and Bluetooth Low Energy (Bluetooth 5) were disabled by software, only Zigbee was activated. Except for the manufacturer, the end user does not have any capability to modify/change the the RF parameters. We acknowledge manufacturers responsibility to provide the radio configurations to ensure compliance with Commissions rules. that is it Signature:

Printed Name/Title: Zhishun Wu/Sales Manager Phone: 0086-571-28081053 Email: marketing@rexense.com

Company Name: Zhejiang Rexense IoT Technology Co., Ltd. ADD: 6F, Building 4, No.6 Longzhou Road,Yuhang District,Hangzhou,China TEL: 0086-571-28081053 FAX: 0086-571-28081053 E-mail: marketing@rexense.com FCC Confidential Authorization Current Date: 2022-4-11 FEDERAL COMMUNICATIONS COMMISSIONS Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Confidentiality Request regarding application for certification of FCC ID:2AOE2-REX3B21 Pursuant to Sections 0.457 and 0.459 of the Commissions Rules, we hereby request confidential treatment of information accompanying this application as outlined below:

Circuit Description --- (Long term) Schematic --- (Long term) Block Diagram --- (Long term) 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, Clients Signature:

Clients Name/Title: Zhishun Wu/Sales Manager QA-FR-171-A

Company Name: Zhejiang Rexense IoT Technology Co., Ltd. ADD: 6F, Building 4, No.6 Longzhou Road,Yuhang District,Hangzhou,China TEL: 0086-571-28081053 FAX: 0086-571-28081053 E-mail: marketing@rexense.com Modular Approval Letter Date: 2022-4-11 FEDERAL COMMUNICATIONS COMMISSIONS Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 We, Zhejiang Rexense IoT Technology Co., Ltd., hereby request Modular Approval for Product: Zigbee Module (Model number: REX3B21, FCC ID: 2AOE2-REX3B21).The EUT meets the requirement for modular approval as detailed in FCC 15.212. the requirements is described below:

1. The modular has RF shielding, please refer to the EUT photo. 2. The modular transmitter has buffered modulation/data inputs, Buffered data inputs stage has been integrated in chip

(Model: EFR32MG21). 3. The Module uses the chip EFR32MG21 with built-in power management components, the module rated power is 3.3V power, Refer to schematics. 4. Comply with the antenna requirements of Section 15.203 and 15.204(c), the modular have a PCB antenna permanently attached to the module, the maximum gain is 1.78dBi. 5. The EUT was tested in a stand-alone configuration, please refer to setup photos exhibit for details. 6. The module labeled with its own FCC ID. 7. Comply with any specific rules or operating requirements that ordinarily apply to a complete transmitter and the manufacturer must provide adequate instructions along with the module to explain any such requirements. The necessary explanation to be complied with this requirement is contained in the user manual, and please refers to the User Manual. 8. The EUT comply with FCC 15.247 (i) & 1.1310 & 2.1091 RF exposure requirements. Clients Signature:

Clients Name/Title: Zhishun Wu/Sales Manager

Company Name: Zhejiang Rexense IoT Technology Co., Ltd. ADD: 6F, Building 4, No.6 Longzhou Road,Yuhang District,Hangzhou,China TEL: 0086-571-28081053 FAX: 0086-571-28081053 E-mail: marketing@rexense.com FCC Authorization Current Date: 2022-4-11 FEDERAL COMMUNICATIONS COMMISSIONS Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Subject: Agent Authorization To whom it may concern:

We Zhejiang Rexense IoT Technology Co., Ltd. CERTIFICATION ICT CO., LTD (DONGGUAN) relating to application for Equipment authorization, including the signing of all documents relating to these matters. All acts carried out by CHINA CERTIFICATION ICT CO., LTD (DONGGUAN) on our behalf shall have the same effect as our own action.

, the undersigned, Hereby authorizes to act on its behalf in all matters CHINA 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, This authorization is valid until further written notice from the applicant. 21 U.S.C. 862. Sincerely Yours, QA-FR-170-B Clients Signature:

Clients Name/Title: Zhishun Wu/Sales Manager