2ATCD-BC214Bluetooth module

BC214 BLE5.3 Bluetooth Module Specification Book Version information version Date Author Description V1.0 Apr 20,2024 Rong wang Create the document V1.1 Jul 15,2024 Xiaofei Zhou Add module package description I BC214 contents Important announcement ........................................ 1 1.Descriptions ................................................ 2 1.1、 Image of the module .................................... 2 1.2、Function Description .................................... 2 1.3、Basic parameter ........................................ 2 2、Hardware application ........................................ 3 3、Size ..................................................... 3 4、 Pin definition ............................................. 3 5、Module MOQ and packaging information ......................... 4 6、Sales and technical support information .......................... 5 Page 1 BC214 Important announcement Copyright notice Copyright: Guangdong Bestcore Internet of Things Technology Co. , Ltd. The contents and attachments contained in this document are copyrighted by Guangdong Bestcore Internet of Things Technology Co. , Ltd. , protected by Chinese law and Copyright Law in applicable international laws and regulations. No person shall reproduce, disseminate, distribute, alter or otherwise use in any way any part or all of this information without the written authorization of Bestcore. Violators will be held accountable in accordance with the law. no warranty Bestcore does not make any statement or warranty, express or implied, on the content of the information, and shall not be liable for any indirect, special or consequential loss in respect of the merchantability and fitness for a particular purpose. Confidentiality This document is a confidential document and the recipient understands that the document is confidential. This document shall not be used for any purpose other than that for which it is intended and shall not be disclosed to any third party. Disclaimer Bestcore shall not be liable for any property or personal injury caused by the user's improper operation. Ask the customer to develop and use the product according to the technical documentation requirements. The company reserves the right to make any changes to the document without prior notice. Page 2 BC214 1.Descriptions 1.1、 Image of the module Fig. 1: Image of BC214 1.2、Function Description BC214 is a low-power Blutooth 5.3 integrated module, based on the 32-bit proprietary MCU with FPU, which can support master-slave switching. It includes full function Bluetooth 5.3. It Can develop a variety of applications based on 32-bit proprietary MCU with FPU This module has rich peripherals, such as UART, GPIO, ADC, PWM, and so on. BC214 has many features, such as easy to develop, BLE connection stability. 1.3、Basic parameter 1.3.1、Bluetooth 5.3 Support 125Kbps/500Kbps/1Mbps/2Mbps/ Receiving sensitivity：-92dBm RX sensitivity @ 1Mbps GFSK -89dBm RX sensitivity @ 2Mbps GFSK Supports 1Mbps and 2Mbps data transfer rates Transmit power：Max:+10dBm 1.3.2、MCU core 32-bit proprietary MCU with FPU Highest frequency: 24MHz RX mode: 8.38mA @3.3V TX mode: 18.24mA @3.3V 0dBm 1uA in Hibernation mode 3.0uA in sleep mode @RC32K Page 3 BC214 2、Hardware application Table 2.1 Recommended operating conditions 3、Size Fig 3.1 Package size chart（The overall maximum thickness of the module is 3mm） Please find the corresponding business interface to provide the package information of the corresponding backplane of the module. 4、Pin definition Rating Min Typ Max Unit Remarks Operating temperature -40 20 85 °C VDD 2.1 3.3 4.8 V Operating current - 10 - mA VDD： 3.3V Page 4 BC214 Fig 4.1 Pin Diagram Table 4.1 Description of pin definition Notice: The red mark is the programming pin. When designing, it is recommended to reserve a burning point. 5、Module MOQ and packaging information Number Name definition Description 1 GND GND negative electrode of module power 2 VDD VDD Positive electrode of module power （3.3V） 3 NC NC NC 4 P09 P09 GPIO TX Connect to the RX of external MCU 5 P10 P10 GPIO RX Connect to the TX of external MCU 6 P14 P14 GPIO Wake Up Connect to external MCU 7 GND GND negative electrode of module power 8 GND GND negative electrode of module power Name MOQ(PCS) Packing BC214 1600 tray Page 5 BC214 6、Sales and technical support information If you need to consult or purchase this product, please call Bestcore during office hours. Office hours: Monday to Friday morning: 08:30-12:00, afternoon: 13:30-18:00 Address： Room605-609, Area B, Huachuangda Qianhai Maker Innovation Base, 38 District, Baoan District, Shenzhen Phone Num：0755-23201496 Room 1011, 10F, ShuMao Building, 6 Xiangxing Road, Torch Development District ,Zhongshan Phone Num： 0760-85288175 7、FCC Statement 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 party responsible for compliance could void the user’s authority to operate the equipment. NOTE: 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…

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Krell Precision(YangZhou)Co.,Ltd. Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 USA Date: April 23, 2026 Ref: Attestation Statements Part 2.911(d)(5)(i) Filing FCC ID: 2ATCD-BC214 Krell Precision(YangZhou)Co.,Ltd.(“the applicant”) certifies that the equipment for which authorization is sought is not “covered” equipment prohibited from receiving an equipment authorization pursuant to section 2.903 of the FCC rules. Krell Precision(YangZhou)Co.,Ltd.(“the applicant”) certifies that the equipment for which authorization is sought does not include cybersecurity or anti-virus software produced or provided by Kaspersky Lab, Inc. or any of its successors and assignees, including equipment with integrated Kaspersky Lab, Inc. (or any of its successors and assignees) cybersecurity or anti-virus software pursuant to DA-24-886 and KDB 986446 D01 Covered Equipment Guidance section B(2a). Device is inherently compliant based on hardware limitations or software controls. or A Software Bill of Materials (SBOM) is provided to the TCB for review, and The end-user or third parties cannot install additional software on this device. Sincerely, Jack Lai Krell Precision(YangZhou)Co.,Ltd. Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 USA Date: April 23, 2026 Ref: Attestation Statements Part 2.911(d)(5)(ii) Filing FCC ID: 2ATCD-BC214 Krell Precision(YangZhou)Co.,Ltd. (“the applicant”) certifies that, as of the date of the filing of the application, the applicant is not identified on the Covered List (as a specifically named entity or any of its subsidiaries or affiliates) as an entity producing “covered” equipment. Sincerely, Jack Lai

Krell Precision(YangZhou)Co.,Ltd. * the applicant must designate a contact located in the United States for purposes of acting as the applicant’s agent for service of process, regardless of whether the applicant is a domestic or foreign entity. An applicant located in the United States may designate itself as the agent for service of process. U.S. Agent Designation for Service of Process - Certification Attestation Letter April 21, 2026 Equipment Authorization Division Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 ATTN.: Reviewing Engineer FCC ID: 2ATCD-BC214 Per section 2.911(d)(7) of the FCC rules, Krell Precision(YangZhou)Co.,Ltd. (“the applicant”) certifies that the equipment for which authorization is sought is designated to the following U.S. Designated agent* for service of process: Company Name: EMCTEK Physical U.S. Company Address: 11788 Big Canyon Lane San Diego, CA 92131 United States Agent name: Fang Liu Phone Number: 8584019073 Agent Email Address: [email protected] FRN: 0037012671 The above contact person accepts the obligation for service of process. The applicant accepts to maintain an agent for no less than one year after the grantee has terminated all marketing and importation or the conclusion of any Commission-related proceeding involving the equipment. Applicant Signed: Designated Agent Signed: (Required, if different to Applicant): Signed: Signed: Printed name: Jack Lai Printed name: Fang Liu Title: CEO Title: Manager Company Name: Krell Precision(YangZhou)Co.,Ltd. Company Name: EMCTEK Date: April 17, 2026 Date: April 21, 2026 FRN Code: 0028467751 FRN Code: 0037012671

Rev 11/20/07 Krell Precision(YangZhou)Co.,Ltd. Federal Communications Commission Authorization and Evaluation Division Date: April 23, 2026 Confidentiality Request regarding application for certification of FCC ID: 2ATCD-BC214 Pursuant to Sections 0.457 and 0.459 of the Commission’s Rules, we hereby request permanently confidential treatment of information accompanying this application as outlined below: Exhibit Type File Name Block Diagram Block Diagram.pdf Schematics Schematics_Part.pdf Operational Description Operational Description.pdf The above materials contain trade secrets and proprietary information not customarily released to the public. The public disclosure of these materials may be harmful to the applicant and provide unjustified benefits to its competitors. The applicant understands that pursuant to Section 0.457 of the Rules, disclosure of this application and all accompanying documentation will not be made before the date of the Grant for this application. Sincerely, Signature: Name: Jack Lai Phone: 0514-87961819 Fax: 0514-87961819 Email: Jack_lai@krellprecision

Krell Precision(YangZhou)Co.,Ltd. FCC ID: 2ATCD-BC214 MODULAR APPROVAL LETTER Modular Approval Requirement Yes/No Comments (i) 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. Yes Refer to the external photographs (ii) The modular transmitter must have buffered modulation/data inputs (if such inputs are provided) to ensure that the module will comply with part 15 requirements under conditions of excessive data rates or over-modulation. Yes All input to the modules are buffered through microprocessor inputs (iii) The modular transmitter must have its own power supply regulation. Yes Internal power regulators refer to the block diagram (iv) 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. Yes Refer to the product photo (v) The modular transmitter must be tested in a stand-alone configuration Yes The EUT was tested in a standalone configuration via a debug device. Refer to the test setup photo (vi) The modular transmitter must be equipped with either a permanently affixed label or must be capable of electronically displaying its FCC identification number. Yes Refer to the label location (vii) The modular transmitter must comply with any specific rules or operating requirements that Yes Refer to the user manual Krell Precision(YangZhou)Co.,Ltd. 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. (viii) The modular transmitter must comply with any applicable RF exposure requirements in its final configuration. Yes Refer to the RF exposure statement for more details Company name: Krell Precision(YangZhou)Co.,Ltd. Contact person (print name& signature): Jack Lai Date: 2026.4.22

Krell Precision(YangZhou)Co.,Ltd. Equipment Autorisation Division Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 Date: April 23, 2026 FCC ID: 2ATCD-BC214 To Whom It May Concern: We, the undersigned, hereby authorize _Totti Zhao_ _ at _CTC Laboratories, Inc. on our behalf, to apply to the Federal Communications Commission on our equipment. Any and all acts carried out by _ Totti Zhao _ on our behalf shall have the same effect as acts of our own. This is to advise that we are in full compliance with the Anti- Drug Abuse Act. We, the applicant, are not subject to a denial of federal benefits pursuant to Section 5301 of the Anti-Drug Act of 1988, 21 USC853a, and no party to the application is subject to a denial of federal benefits pursuant to that section. Regards, Signature: Name: Jack Lai Phone: 0514-87961819 Fax: 0514-87961819 Email: Jack_lai@krellprecision

CTC Laboratories, Inc. Room 107, 108, 207, 208, 303 of Building A, Room 101 of Building B, No.7, Lanqing 1st Road, Luhu Community, Guanhu Subdistrict, Longhua District, Shenzhen, Guangdong, China Tel: +86-755-27521059 Fax: +86-755-27521011 http://www.sz-ctc.org.cn Page 1 of 2 Internal Photographs Page 2 of 2 Antenna

CTC Laboratories, Inc. Room 107, 108, 207, 208, 303 of Building A, Room 101 of Building B, No.7, Lanqing 1st Road, Luhu Community, Guanhu Subdistrict, Longhua District, Shenzhen, Guangdong, China Tel: +86-755- 27521059 Fax: +86-755- 27521011 Http://www.sz-ctc.org.cn Page 1 of 1 Label & Label Location

CTC Laboratories, Inc. Room 107, 108, 207, 208, 303 of Building A, Room 101 of Building B, No.7, Lanqing 1st Road, Luhu Community, Guanhu Subdistrict, Longhua District, Shenzhen, Guangdong, China Tel: +86-755-27521059 Fax: +86-755-27521011 http://www.sz-ctc.org.cn Page 1 of 2 Internal Photographs Page 2 of 2 Antenna

Page 1 of 2 Report No.: CTC2026194102 CTC Laboratories, Inc. Room 107, 108, 207, 208, 303 of Building A, Room 101 of Building B, No.7, Lanqing 1st Road, Luhu Community, Guanhu Subdistrict, Longhua District, Shenzhen, Guangdong, China Tel.: (86)755-27521059 Fax: (86)755-27521011 Http://www.sz-ctc.org.cn TRF No：CTC-TR-066_A3 Master TRF：Dated 2026-01-01 Maximum Permissible Exposure Evaluation FCC ID: 2ATCD-BC214 According to FCC 1.1310: The criteria listed in the following table shall be used to evaluate the environment impact of human exposure to radio frequency (RF) Radiation as specified in §1.1307(b). EUT Specification Product Name: Bluetooth module Trade Mark: / Model/Type Reference: BC214 Listed Model(s): / Model Differences: / Frequency Band (Operating) BLE: 2402MHz ~ 2480MHz Device Category Portable (<5mm separation) Mobile (>20cm separation) Fixed (>20cm separation) Others ___ Exposure Classification Occupational/Controlled exposure (S=5mW/cm2) General Population/Uncontrolled exposure (S=1mW/cm2) Antenna Diversity Single antenna Multiple antennas Tx diversity Rx diversity Tx/Rx diversity Antenna Gain (Max) BLE: -2.30dBi Evaluation Applied MPE Evaluation SAR Evaluation Page 2 of 2 Report No.: CTC2026194102 CTC Laboratories, Inc. Room 107, 108, 207, 208, 303 of Building A, Room 101 of Building B, No.7, Lanqing 1st Road, Luhu Community, Guanhu Subdistrict, Longhua District, Shenzhen, Guangdong, China Tel.: (86)755-27521059 Fax: (86)755-27521011 Http://www.sz-ctc.org.cn TRF No：CTC-TR-066_A3 Master TRF：Dated 2026-01-01 Limits for Maximum Permissible Exposure (MPE) Frequency Range (MHz) Electric Field Strength (V/m) Magnetic Field Strength (A/m) Power Density (mW/cm 2 ) Averaging Time (minutes) (A) Limits for Occupational/Controlled Exposure 300-1500 -- -- F/300 <6 1500-100000 -- -- 5 <6 (B) Limits for General Population/Uncontrolled Exposure 300-1500 -- -- F/1500 <30 1500-100000 -- -- 1 <30 Calculation Method Friis transmission formula: Pd=(P out *G)/(4*Pi*R 2 ) Where: Pd= Power density in mW/cm 2 P out = output power to antenna in mW G= gain of antenna in linear scale Pi= 3.1416 R= distance between observation point and center of the radiator in cm Pd limit of MPE is 1mW/cm 2 . If we know the maximum gain of the antenna and total power input to the antenna, through the calculation, we will know the distance where the MPE limit is reached. Measurement Result Mode Frequency (MHz) Antenna Gain (dBi) Maximum Power (dBm) Max. Tune Up Power (dBm) Power Density at 20cm (mW/cm 2 ) Limit (mW/cm 2 ) BLE 2440 -2.30 4.41 5 0.0004 1 Note: 1. Calculate in the worst-case mode. 2. Max. Tune Up Power is declared by manufacturer, and used to calculate. 3. For a more detailed features description, please refer to the RF Test Report. **********************THE END**********************

CTC Laboratories, Inc. $CNAS$ CTC Laboratories, Inc. Room 107, 108, 207, 208, 303 of Building A, Room 101 of Building B, No.7, Lanqing 1st Road, Luhu Community, Guanhu Subdistrict, Longhua District, Shenzhen, Guangdong, China Tel.: (86)755-27521059 Fax: (86)755-27521011 Http://www.sz-ctc.org.cn TRF No：CTC-TR-058_A3 Master TRF：Dated 2026-01-01 TEST REPORT Report No. .................................... : CTC2026194101 FCC ID ........................................... : 2ATCD-BC214 Applicant ...................................... : Krell Precision(YangZhou)Co.,Ltd. Address .......................................... : NO.28 XingYang Road,Development Area, Yangzhou City Manufacturer..................................: Krell Precision(YangZhou)Co.,Ltd. Address..........................................: NO.28 XingYang Road,Development Area, Yangzhou City Product Name .............................. : Bluetooth module Trade Mark .................................... : / Model/Type reference .................... : BC214 Listed Model(s) .............................. : / Standard ....................................... : FCC CFR Title 47 Part 15 Subpart C Section 15.247 Test Report Form No ..................... : CTC-TR-058_A3 Master TRF .................................... : Dated 2026-01-01 Date of receipt of test sample........: Apr. 14, 2026 Date of testing..............................: Apr. 14, 2026 ~ Apr. 15, 2026 Date of issue................................: Apr. 23, 2026 Result............................................: PASS Compiled by: (Printed name+signature) Alicia Liu Supervised by: (Printed name+signature) Eric Zhang Approved by: (Printed name+signature) Totti Zhao This test report may be duplicated completely for legal use with the approval of the applicant. It should not be reproduced except in full, without the written approval of our laboratory. The client should not use it to claim product endorsement by CTC. The Test Result in the report only apply to the tested sample. The test report shall be invalid without all the signatures of testing engineers, reviewer and approver. Any objections must be raised to CTC within 15 days since the date when the report is received. It will not be taken into consideration beyond this limit. Page 2 of 41 Report No.: CTC2026194101 CTC Laboratories, Inc. Room 107, 108, 207, 208, 303 of Building A, Room 101 of Building B, No.7, Lanqing 1st Road, Luhu Community, Guanhu Subdistrict, Longhua District, Shenzhen, Guangdong, China Tel.: (86)755-27521059 Fax: (86)755-27521011 Http://www.sz-ctc.org.cn TRF No：CTC-TR-058_A3 Master TRF：Dated 2026-01-01 Table of Contents Page 1. TEST SUMMARY ....................................................................................................................................................... 3 1.1. TEST STANDARDS .......................................................................................................................................................... 3 1.2. REPORT VERSION ......................................................................................................................................................... 3 1.3. TEST DESCRIPTION ........................................................................................................................................................ 3 1.4. TEST FACILITY .............................................................................................................................................................. 4 1.5. MEASUREMENT UNCERTAINTY ........................................................................................................................................ 5 1.6. ENVIRONMENTAL CONDITIONS ........................................................................................................................................ 5 2. GENERAL INFORMATION .......................................................................................................................................... 6 2.1. CLIENT INFORMATION ................................................................................................................................................... 6 2.2. GENERAL DESCRIPTION OF EUT ...................................................................................................................................... 6 2.3. ACCESSORY EQUIPMENT INFORMATION ............................................................................................................................ 7 2.4. OPERATION STATE ........................................................................................................................................................ 8 2.5. MEASUREMENT INSTRUMENTS LIST ................................................................................................................................. 9 3. TEST ITEM AND RESULTS ........................................................................................................................................ 11 3.1. CONDUCTED EMISSION................................................................................................................................................ 11 3.2. RADIATED EMISSION ................................................................................................................................................... 14 3.3. BAND EDGE EMISSIONS (RADIATED) .............................................................................................................................. 22 3.4. BAND EDGE AND SPURIOUS EMISSIONS (CONDUCTED) ...................................................................................................... 27 3.5. DTS BANDWIDTH ....................................................................................................................................................... 32 3.6. PEAK OUTPUT POWER ......................................................................................…

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Module Bluetooth Antenna Specification 1.Antenna Description Product Name：LE ANT B Model：L EANT B Trade Name： BestCore HW Version： / SW Version： / Frequency Ban：2400MHz-2500MHz Manufacturer： Guangdong BestCore Internet of Things Technology Co., Ltd. 2.Antenna picture on the PCB borad Table 1. Antenna Performance Test Frequency(MHz) Gain(dBi) Efficiency(%) 2400 -2.30929.66% 2420 -2.77725.74% 2440 -3.72620.97% 2460 -3.34923.27% 2480 -3.43222.06% 2500 -3.14723.13% 3.Gain resule plot 4.Efficiency result plot 2D Radiation pattern Phi=0°&Phi=90°_2400MHz Phi=0°&Phi=90°_2460MHz Phi=0°&Phi=90°_2500MHz 3D Radiation pattern 2400MHz 2460MHz 2500MHz

CTC Laboratories, Inc. Room 107, 108, 207, 208, 303 of Building A, Room 101 of Building B, No.7, Lanqing 1st Road, Luhu Community, Guanhu Subdistrict, Longhua District, Shenzhen, Guangdong, China Tel: +86-755-27521059 Fax: +86-755-27521011 http://www.sz-ctc.org.cn Page 1 of 2 Radiated Measurement 30-1000MHz Above 1GHz Page 2 of 2 Conducted Emission Measurement Above 1GHz