WiFi Module BL3353-P Product Manual v1.1

Features

• Support IEEE802.11 b/g/n standards
• Support WEP, WPA and WPA2 encryption
• Support UART/PWM/ADC/GPIO/I2C interfaces
• Support STA/AP/AP+STA modes
• Support SmartConfig
• Support TLS/SSL/mDNS protocols
• Support PCB antenna
• 3.3V power supply
• Dimensions (17.7±0.2) mm * (30±0.2) mm * (3.6±0.2) mm (with shielding case)

1. Overview

BL3353-P is an embedded Wi-Fi module designed by BroadLink, which supports 802.11 b/g/n standards and UART communication with other devices. The module integrates radio transceiver, MAC, baseband, all Wi-Fi protocols, configurations and network stack. It can be widely used in applications like smart home devices, remote monitoring devices and medical care instruments.

The module integrates an ARM Cortex-M4 processor speed up to 125MHz and 256KB SRAM with external 1MB flash.

1.1 Basic Specification

1.1.1 WLAN Parameter

Security

Encryption standard: Open/WEP-Open/WPA/WPA2

Encryption algorithm: WEP64/WEP128/TKIP/AES

Network types

STA/AP/STA+AP/WIFI Direct

1.1.2 Absolute Maximum Ratings

1.1.3 DC Voltage and Current

1.1.4 IEEE802.11b mode

TX Characteristics

RX Characteristics

1.1.5 IEEE802.11g mode

TX Characteristics

RX Characteristics

1.1.6 IEEE802.11n 20MHz bandwidth mode

TX Characteristics

RX Characteristics

1.1.7 IEEE802.11n 40MHz bandwidth mode

TX Characteristics

RX Characteristics

1.2 Hardware

1.2.1 Mechanical Dimensions

Diagram showing the physical dimensions of the WiFi Module BL3353-P. The overall dimensions are approximately 17.70 mm in length, 16.30 mm in width, and 30.00 mm in height. Key features include a 0.80 mm pitch for pins, a 1.20 mm width for the module body, and a 0.50 mm spacing between pins.

1.2.2 Pin Definitions

A diagram illustrating the pin layout of the WiFi Module BL3353-P. It shows 14 pins arranged in two rows. A table details each pin's number, interface type (e.g., GND, VDD, NRST, TX0, SPI_MOSI, GPIOA23, RX0, TX2, GPIOA30, I2C0_SDA, RX2, GPIO29, I2C_SCL, GPIO19, SPI_CS, I2C0_SCL, GPIOA22, SPI_MISO, GPIOA5, GPIOA14, SWD_CLK, GPIOA15, SWD_DATA, VDD, GND), description (e.g., Ground, 3.3V Power, HW reset, UART0 TX, SPI interface, Support PWM0), and type (POWER, I, O, I/O).

Note:

• In default, UARTO is used for bypass communication and UART2 is used for output of debugging information. Please refer to the description in DC Characteristics for UART output current level.
• RESET is hardware reset pin and will be effective with VIL. Configuration information will be remained after module reset. The module is already designed with RC reset upon power-on.
• TX and RX in UARTO are used for communication with external MCU powered by 3V. Please refer to the description in 3.3. DC Characteristics for UART output current level.

1.2.3 PCB Antenna

A visual representation of the PCB antenna integrated into the WiFi Module BL3353-P, showing its placement and design on the circuit board. Accompanying text states the antenna gain is approximately 1.2dB. A simulated radiation pattern diagram shows the antenna's signal strength distribution in 3D space, with color gradients indicating gain levels.

The following precautions should be considered during designing with PCB antenna:

• Do not place any electrical components or grounding in antenna area on main board and it's better to leave this area blank on PCB.
• It is recommended to not place any electrical components within 30mm range of module antenna and not design any circuit or bond copper on main board under this area.
• Do not use the module inside any metal case or containers with metal painting.
• Keep the antenna of Wi-Fi module next to the edge of main board during design of PCB to ensure better performance of antenna, as illustrated below.

1.3 Reference Design

1.3.1 UART Interface Design

A schematic illustrating the UART interface connection between the WiFi Module and a Mainboard MCU for devices powered by 3.3V. It shows the TX pin of the module connecting to the RXD pin of the MCU, and the RX pin of the module connecting to the TXD pin of the MCU. A 3.3V power supply and GND connection are also depicted, along with a C1 capacitor.

If your device is powered by 5V, you can refer to the circuit shown in the figure below or design your own circuit for power conversion. The value of resistor can be adjusted according to actual circuit design.

Circuit diagrams demonstrating voltage level shifting for UART communication between devices operating at 5V and the 3.3V WiFi module. Two configurations are shown: one for Device TX level shift (5V to 3.3V) and another for WiFi TX level shift (3.3V to 5V), utilizing transistors and resistors.

1.3.2 Power Supply Requirement

• If an LDO is used to supply the module with 3.3V power, C1 capacitor can be considered to be used with 10u-22u; If a DCDC is used to supply 3.3V power, C1 capacitor can be considered to be used with 22uF.
• It is recommended to supply the module with power higher than 400mA to ensure enough power supply to the module and avoid power down during data.
• The module is designed with 2x 3.3V pins. You can power the module with either pin or both pins.

1.4 Other

Integration instructions for host product manufacturers according to KDB 996369 D03 OEM Manual v01.

2. List of applicable FCC rules

FCC Part 15.247

2.3 Specific operational use conditions

Product is a Single-modular transmitter policies independent of any host. Not applicable.

2.4 Limited module procedures

Product is a Single-modular transmitter. It is not a limited module. Not applicable.

2.5 Trace antenna designs

Product with a PCB antenna. Not applicable.

2.6 RF exposure considerations

20 cm from a person's body.

2.7 Antennas

Product with a PCB antenna. Not applicable.

2.8 Label and compliance information

Remind end customers to add "Contain FCC ID: 2ATEV-BL3353-P".

2.9 Information on test modes and additional testing requirements

Product is a Single-modular transmitter. Test stand alone. Not applicable.

2.10 Additional testing, Part 15 Subpart B disclaimer

Part 15B required for the entire device even though module is 15C certified.

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, and
2. This device must accept any interference received, including interference that may cause undesired operation.

NOTE 1: Any changes or modifications to this unit not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.

French Summary: L'appareil est conforme aux CNR d'Innovation, Sciences et Développement économique Canada. L'exploitation est autorisée aux deux conditions suivantes: 1. L'appareil ne doit pas produire de brouillage; 2. L'appareil doit accepter tout brouillage radioélectrique subi, même si le brouillage est susceptible d'en compromettre le fonctionnement.

FCC Radiation Exposure Statement

This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. End users must follow the specific operating instructions for satisfying RF exposure compliance.

Note 1: This module is certified to comply with RF exposure requirements under mobile or fixed conditions and is to be installed only in mobile or fixed applications. A mobile device is defined as a transmitting device designed for use in other than fixed locations, typically maintaining a separation distance of at least 20 cm between the transmitter's radiating structure(s) and the body of the user or nearby persons. Devices used by consumers or workers that can be easily relocated, such as wireless devices associated with a personal computer, are considered mobile devices if they meet the 20 cm separation requirement. A fixed device is physically secured at one location and not easily moved.

Note 2: Modifications to the module will void the Grant of Certification. This module is limited to OEM installation only and must not be sold to end-users. End-users should not have manual instructions to remove or install the device; only software or operating procedures should be placed in the end-user operating manual of final products. Additional testing and certification may be necessary when multiple modules are used.

Note 3: The module may be operated only with the antenna with which it is authorized. Any antenna of the same type and equal or less directional gain than the authorized antenna may be marketed with and used with this intentional radiator.

Note 4: To ensure compliance with all non-transmitter functions, the host manufacturer is responsible for ensuring compliance with the installed and fully operational module(s). For example, if a host was previously authorized as an unintentional radiator under the Supplier's Declaration of Conformity procedure without a transmitter certified module and a module is added, the host manufacturer is responsible for ensuring that after the module is installed and operational, the host continues to be compliant with the Part 15B unintentional radiator requirements. Hangzhou BroadLink Technology Co., Ltd. shall provide guidance to the host manufacturer for compliance with the Part 15B requirements.

Note 5: The FCC ID label on the final system must be labeled with "Contains FCC ID: 2ATEV-BL3353-P" or "Contains transmitter module FCC ID: 2ATEV-BL3353-P".

IC Radiation Exposure Statement: This device and its antenna(s) must not be co-located with any other transmitters except in accordance with IC multi-transmitter product procedures. This equipment complies with IC RSS-102 radiation exposure limits for an uncontrolled environment. This equipment should be installed and operated with a minimum distance of 20cm between the radiator and your body.

French Summary: Cet appareil et son antenne (s) ne doit pas être co-localisés ou fonctionnement en association avec une autre antenne ou transmetteur. Cet équipement est conforme aux limites d'exposition aux rayonnements IC établies pour un environnement non contrôlé. Cet équipement doit être installé et utilisé avec un minimum de 20cm de distance entre la source de rayonnement et votre corps.

This module is limited to OEM installation only and must not be sold to end-users. End-user has no manual instructions to remove or install the device; only software or operating procedure shall be placed in the end-user operating manual of final products. Additional testing and certification may be necessary when multiple modules are used.

Any changes or modifications not expressly approved by the manufacturer could void the user's authority to operate this equipment.

The final end product must be labeled in a visible area with the following "Contains IC: 25062-BL3353P".