2AFZZMHCWB4P-IB2.4 GHz Wi-Fi+BLE Dual-mode Module

Xiaomi Smart WIFI Module Rev 1.1 CMIIT ID: XXXXXXXXXXXXX Xiaomi Communications Co., Ltd. iot.mi.com Xiaomi Communications Co., Ltd. 4 / 14 1 Product description 1.1 Solution overview MHCWB4P-IB is an embedded high-performance WIFI + BLE module, using Realtek XMC1R chip platform solution.MHCWB4P-IB is an integrated U.FL seat, which needs to be equipped with IPEX Antenna for using. The two modules are mainly applicable to many IoT applications such as smart home appliances, home automation, and industrial Internet. 1.2 System hardware advantages The module supports a variety of interfaces, and integrates 2MB Flash internally, which is suitable for connecting sensors, starters and other connections, reducing external component requirements and PCB size. Multiple GPIO interfaces are pulled out of the module for users to connect to the motherboard. We support module function customization service, as well as factory parameter preset settings, and have a comprehensive software development platform and testing tools; The module has passed various related certification tests. table 1-1. MHCWB4P-IB basic parameters module MHCWB4P-IB IC XMC1R Antenna IPEX Mechanical Dimensions （unit：mm） 18*25*3.1 Xiaomi Communications Co., Ltd. 5 / 14 table 1-2.MHCWB4P-B&MHCWB4P-IB Parameters Table category parameter Description Wireless parameter Standard certification Wi-Fi protocol 802.11 b/g/n Frequency Range 2.412 GHz ~ 2.462GHz Hardware parameter Data interface UART/HSPI/I2C/I2S GPIO/PWM Operating Voltage 2.7V ~ 3.6V Operating current average：80 mA Supply current min：500 mA Operating temperature -40°C ~ 85°C Storage temperature -40°C ~ 85°C External interface - Software parameter Wireless network mode Station/SoftAP/SoftAP+Station Security Mechanism WPA/WPA2 Encryption type WEP/TKIP/AES Firmware upgrade Local serial programming / OTA upgrade / host download & programming Software development Support for custom’s server Provide SDK required for secondary development Network protocol IPv4，TCP/UDP/HTTP/FTP User configuration AT+Instruction Set, Cloud server, Android/iOS app 2 Pin descriptions The pin distribution of the chip module MHCWB4P-IB is shown in Figure 2-1 Xiaomi Communications Co., Ltd. 6 / 14 figure 2-1. MHCWB4P-IB pin distribution MHCWB4P-IB has a total of 18 pins. See Table 2-1 for pin definitions. table 2-1. MHCWB4P-IB pin definition Number Pin name Description 1 VDD Power The maximum output current of the external power supply is recommended to be 500 mA and above. 2 CHIP-EN Module enable 3 GPIO2 I/O 4 GPIO4 I/O 5 GPIO13 I/O Communication RX 6 GPIO14 I/O Communication TX 7 GIPO17 I/O 8 GPIO18 I/O 9 GND Ground 10 GPIO19 I/O Xiaomi Communications Co., Ltd. 7 / 14 11 GPIO15 I/O Debug RX 12 GPIO16 I/O Debug TX 13 GPIO20 I/O 14 GPIO23 I/O 15 GPIO3 I/O 16 GPIO1 I/O 17 GPIO0 I/O 18 GND Ground Note: When GPIO0 is powered on, do not pull it high, otherwise it will enter download mode. Module startup configuration table: 3 Electrical parameters Note: Unless otherwise specified, the test conditions are: VDD = 3.3V, temperature is 25 °C. 3.1 Electrical characteristics table 3-1. Electrical parameters Parameter Symbol Minimum Typical Maximum Units Xiaomi Communications Co., Ltd. Storage temperature - -40 Normal temperature 85 °C Operating temperature - -40 20 85 °C - -40 20 105 °C Welding temperature (welding condition: IPC / JEDEC J-STD-020) - - - 260 °C Supply voltage VDD 2.7 3.3 3.6 V Input-Low Voltage V IL -0.3 - 0.25 VDD V Input-High Voltage V IH 0.75 VDD - VDD + 0.3 V Output-Low Voltage V OL - - 0.1 VDD V Output-High Voltage V OH 0.8 VDD - - V Xiaomi Communications Co., Ltd. 10 / 14 3.3 Reflow temperature curve Figure 3-1. MHCWB4P-IB Reflow temperature curve Soldering instructions: In double-sided SMT, after the T-side (top side) components are reflowed for the first time, the circuit board needs to be flipped and reflow soldered on the other side. In the second reflow, the already soldered T-side components will be fixed by the surface tension of the solder paste to prevent the components from dropping under the effect of gravity. The design of the mother board and the yin and yang board are over-furnaceed (furnace temperature 240-260°C) and verified that there is no defect. To ensure its stability, it is recommended to dispense. Xiaomi Communications Co., Ltd. 11 / 14 4 Peripheral design schematic Figure 4-1. MHCWB4P-IB module reference design 5 Mechanical Dimension Chart Xiaomi Communications Co., Ltd. 12 / 14 Figure 5-1.MHCWB4P-IB mechanical dimension chart 6 U.FL Mechanical Dimension Figure 6-1.MHCWB4P-IB U.FL mechanical dimension Xiaomi Communications Co., Ltd. 13 / 14 7 MSL level / Storage conditions MSL level: Level 3-less than or equal to 30°C/ 60% RH 168 hours workshop life. Storage conditions: The products should be handled carefully during transportation, and they should not be squeezed against each other to avoid being impacted and strongly vibrated. The storage environment should be kept dry and ventilated. The ambient temperature should be between 5°C and 35°C. It should not be stored with items that can generate corrosive gases. 8 Delivery Checklist Complete packaging Evaluation tool (SPI / UART / JTAG interface) The software supports customer integration and performance test certification. Unit test / Qualification report Product specifications Complete and clear identification, such as production serial number, MAC, etc. Agency certification report 9 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…

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Company: Xiaomi Communications Co., Ltd. Add: #019, 9th Floor, Building 6, 33 Xi'erqi Middle Road, Haidian District,Beijing,100085,China Tel: 010 6060 6666 Fax: 010 6060 6666 FCC Authorization Date: 2020-03-04 FEDERAL COMMUNICATIONS COMMISSION Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Subject: Agent Authorization To whom it may concern: We, Xiaomi Communications Co., Ltd. , the undersigned, Hereby authorizes 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 Laboratories Corp. 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 Yours, Signature: Printed Name: Xiaogang Jiao QA-FR-170-B

Company Name: Xiaomi Communicatio ns Co., Ltd. Add: #019, 9th Floor, Building 6, 33 Xi'erqi Middle Road, Haidian District,Beijing,100085,China Tel: 01 0 6060 6666 Fax: 010 6060 6666 E-mail: [email protected] FCC Confidential Authorization Date: 2020-03-04 FEDERAL COMMUNICATIONS COMMISSIONS Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Subject: Confidentiality Request regarding application for certification of FCC ID: 2AFZZMHCWB4P- IB To: whom it may concern, In accordance with Sections 0.457 and 0.459 of the Commission’s Rules, Xiaomi Communications Co., Ltd. hereby requests long-term confidential treatment of inform ation 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 Yours, Signature: Printed Name: Xiaogang Jiao

Modular Approval Letter 2020-04-28 Applicant：Xiaomi Communications Co.,Ltd. Application Address：#019, 9th Floor, Building 6, 33Xi′erqi Middle Road, Haidian District, Beijing,China E-mail：[email protected] Product Name: 2.4Ghz WIFI+BLE dual-mode module Model Name: MHCWB4P-IB F CC ID: 2AFZZMHCWB4P-IB Section 15.212 Modular Transmitters Request for Modular Approval Request for Limited Modular Approval SingleModularApprovalRequirements: Item Requirements EUT Conditions Comply( Y/N) 1 The radio elements of the modular transmitter must have their own shielding. The physical crystal and tuning capacitors may be located external to the shielded radio elements. Refer to external photos. This module has shield cover. Y 2 The modular transmitter must have buffered modulation/data inputs (if such inputs are provided) to ensure that the module will comply with part 15.247 requirements under conditions of excessive data rates or over-modulation. All inputs to the modules are buffered through logic or microprocessor inputs. Refer to Schematics. Y 3 The modular transmitter must have its own power supply regulation. The Module uses the chip ESP32-D0WD-V3 with built-in power management components, the module rated power is 3.0-3.6V power. Refer to schematics. Y Item Requirements EUT Conditions Comply( Y/N) 4 The modular transmitter must comply with the antenna and transmission system requirements of §15.203, §15.204(b) and §15.204(c). The antenna must either be permanently attached or employ a “unique” antenna coupler (at all connections between the module and the antenna, including the cable). The “professional installation” provision of §15.203 is not applicable to modules but can apply to limited modular approvals under paragraph (b) of this section. The modular transmitter has a IPEX antenna arrangement for 2.4G Wi-Fi/Bluetooth. Refer to internal photo. Y 5 The modular transmitter must be tested in a stand-alone configuration, i.e., the module must not be inside another device during testing for compliance with part §15.247 requirements. Unless the transmitter module will be battery powered, it must comply with the AC line conducted requirements found in §15.207. AC or DC power lines and data input/output lines connected to the module must not contain ferrites, unless they will be marketed with the module (see §15.27(a)). The length of these lines shall be the length typical of actual use or, if that length is unknown, at least 10 centimeters to insure that there is no coupling between the case of the module and supporting equipment. Any accessories, peripherals, or support equipment connected to the module during testing shall be unmodified and commercially available (see §15.31(i)). The modular transmitter is connected to the controlled board when testing. Please refer to setup photo. Y Item Requirements EUT Conditions Comply( Y/N) 6 If using a permanently affixed label, the modular transmitter must be labeled with its own FCC identification number, and, if the FCC identification number is not visible when the module is i nstalled inside another device, then the outside of the device into which the module is i nstalled 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: 2AFZZMHCWB4P-IB Any similar wording that expresses the same meaning may be used. The Grantee may either provide such a label, an example of which must be included in the application for equipment authorization, or, must provide adequate instructions along with the module which explain this requirement. In the latter case, a copy of these instructions must be included in the application for equipment authorization. Refer to the label. Y 7 The modular transmitter must 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. A copy of these instructions must be included in the application for equipment authorization. Refer to manual. Y Item Requirements EUT Conditions Comply( Y/N) 8 The modular transmitter must comply with any applicable RF exposure requirements in its final configuration. The EUT meets RF exposure evaluation §2.1091.If the device built into a host as a portable usage, the additional RF exposure evaluation may be required as specified by §2.1093 Y Contact Name/Title: Xiaogang Jiao E-mail:[email protected] Application Address: #019, 9th Floor, Building 6, 33Xi′erqi Middle Road, Haidian District, Beijing,China

Bay Area Compliance Laboratories Corp. (Linkou Laboratory) Report No.: RLK200226002-00 Page 1 of 2 External Photographs (Brand: / Model: MHCWB4P-IB) EUT Bay Area Compliance Laboratories Corp. (Linkou Laboratory) Report No.: RLK200226002-00 Page 2 of 2 Antenna Antenna

Bay Area Compliance Laboratories Corp. (Linkou Laboratory) Report No.: RLK200226002-00 Page 1 of 1 Internal Photographs (Brand: / Model: MHCWB4P-IB) Dismantling RF IC

Bay Area Compliance Laboratories Corp.(Linkou Laboratory) Report No.: RLK200226002-00A Page 11 of 50 4 FCC§15.247(i), §1.1307, § 2.1091 – Maximum Permissible Exposure (MPE) 4.1 Applicable Standard According to subpart 15.247(i)and subpart §1.1310, systems operating under the provisions of this section shall be operated in a manner that ensures that the public is not exposed to radio frequency energy level in excess of the Commission’s guidelines. Limits for Maximum Permissible Exposure (MPE) (§1.1310, §2.1091) (B) Limits for General Population/Uncontrolled Exposure Frequency Range (MHz) Electric Field Strength (V/m) Magnetic Field Strength (A/m) Power Density (mW/cm 2 ) Averaging Time (minutes) 0.3–1.34 614 1.63 *(100) 30 1.34–30 824/f 2.19/f *(180/f²) 30 30–300 27.5 0.073 0.2 30 300–1500 / / f/1500 30 1500–100,000 / / 1.0 30 f = frequency in MHz; * = Plane-wave equivalent power density; According to §1.1310 and §2.1091 RF exposure is calculated. Calculated Formulary: Predication of MPE limit at a given distance S = PG/4R² = power density (in appropriate units, e.g. mW/cm 2 ); P = power input to the antenna (in appropriate units, e.g., mW); G = power gain of the antenna in the direction of interest relative to an isotropic radiator, the power gain factor, is normally numeric gain; R = distance to the center of radiation of the antenna (appropriate units, e.g., cm); For simultaneously transmit system, the calculated power density should comply with: 4.2 RF Exposure Evaluation Result MPE Evaluation: Mode Frequency Range (MHz) Antenna Gain Target Power Evaluation Distance (cm) Power Density (mW/cm 2 ) MPE Limit (mW/cm 2 ) (dBi) (numeric) (dBm) (mW) Wi-Fi 2.4G 2412-2462 3.01 1.9999 26.50 446.6836 20 0.1778 1.0 BLE 2402-2480 3.01 1.9999 7.00 5.0119 20 0.0020 1.0 Note: Wi-Fi and BT can’t simultaneously. Result: MPE evaluation of single and simultaneous transmission meet the requirement of standard.

FCC Part 15.247 TEST REPORT For Xiaomi Communications Co.,Ltd. #019, 9th Floor, Building 6, 33 Xi'erqi Middle Road, Haidian District, Beijing, 100085, China FCC ID: 2AFZZMHCWB4P-IB Report Type Original Report Product Name: 2.4Ghz WIFI+BLE dual-mode module Model Name: MHCWB4P-IB Report Number : RLK200226002-00A Report Date : 2020/03/23 Reviewed By : Zeus Chen Prepared By: Bay Area Compliance Laboratories Corp.(Linkou Laboratory) No. 6, Wende 2Rd., Guishan Dist., Taoyuan City 33382, Taiwan (R.O.C.) Tel: +886 (3)3961072; Fax: +886 (3) 3961027 www.bacl.com.tw Note: This test report is prepared for the customer shown above and for the device described herein. It may not be duplicated or used in part without prior written consent from Bay Area Compliance Laboratories Corp. (Linkou Laboratory) Bay Area Compliance Laboratories Corp.(Linkou Laboratory) Report No.: RLK200226002-00A Page 2 of 50 Revision History Revision Report Number Issue Date Description 1.0 RLK200226002-00A 2020/03/23 Original Report Bay Area Compliance Laboratories Corp.(Linkou Laboratory) Report No.: RLK200226002-00A Page 3 of 50 TABLE OF CONTENTS 1 GENERAL INFORMATION ....................................................................................................................................... 5 1.1 PRODUCT DESCRIPTION FOR EQUIPMENT UNDER TEST (EUT) ...................................................................................... 5 1.2 OPERATION CONDITION OF EUT ............................................................................................................................ 5 1.3 OBJECTIVE AND TEST METHODOLOGY ..................................................................................................................... 6 1.4 MEASUREMENT UNCERTAINTY .............................................................................................................................. 6 1.5 ENVIRONMENTAL CONDITIONS AND TEST DATE ........................................................................................................ 6 1.6 TEST FACILITY ..................................................................................................................................................... 6 2 SYSTEM TEST CONFIGURATION ............................................................................................................................. 7 2.1 TEST CHANNELS AND DESCRIPTION OF WORST TEST CONFIGURATION ........................................................................... 7 2.2 SUPPORT EQUIPMENT LIST AND EXTERNAL CABLE LIST ............................................................................................... 8 2.3 BLOCK DIAGRAM OF TEST SETUP ........................................................................................................................... 8 2.4 DUTY CYCLE ....................................................................................................................................................... 9 3 SUMMARY OF TEST RESULTS ............................................................................................................................... 10 4 FCC§15.247(I), §1.1307, § 2.1091 – MAXIMUM PERMISSIBLE EXPOSURE (MPE) .............................................. 11 4.1 APPLICABLE STANDARD ...................................................................................................................................... 11 4.2 RF EXPOSURE EVALUATION RESULT ...................................................................................................................... 11 5 FCC §15.203 - ANTENNA REQUIREMENTS ........................................................................................................... 12 5.1 APPLICABLE STANDARD ...................................................................................................................................... 12 5.2 ANTENNA LIST AND DETAILS ............................................................................................................................... 12 6 FCC §15.207 - AC LINE CONDUCTED EMISSIONS ................................................................................................. 13 6.1 APPLICABLE STANDARD ...................................................................................................................................... 13 6.2 EUT SETUP AND TEST PROCEDURE ....................................................................................................................... 13 6.3 TEST EQUIPMENT LIST AND DETAILS ..................................................................................................................... 14 6.4 TEST RESULT .................................................................................................................................................... 15 7 FCC §15.209, §15.205, §15.247(D) – SPURIOUS EMISSIONS ............................................................................... 16 7.1 APPLICABLE STANDARD ...................................................................................................................................... 16 7.2 EUT SETUP AND TEST PROCEDURE ....................................................................................................................... 18 7.3 TEST EQUIPMENT LIST AND DETAILS ..................................................................................................................... 19 7.4 TEST RESULT .................................................................................................................................................... 20 8 FCC §15.247(A)(2) – 6 DB EMISSION BANDWIDTH ............................................................................................. 33 8.1 APPLICABLE STANDARD ...................................................................................................................................... 33 8.2 TEST PROCEDURE ..............................................…

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Bay Area Compliance Laboratories Corp.(Linkou Laboratory) Report No.: RLK200226002-00 Page 1 of 3 EUT Setup Photographs Conduction Bay Area Compliance Laboratories Corp.(Linkou Laboratory) Report No.: RLK200226002-00 Page 2 of 3 Radiated Emission (Below 1 GHz) Bay Area Compliance Laboratories Corp.(Linkou Laboratory) Report No.: RLK200226002-00 Page 3 of 3 Radiated Emission (Above 1 GHz)