Product Overview
The BL3385-P is a cost-effective embedded Wi-Fi module designed by BroadLink, supporting IEEE 802.11 b/g/n standards and UART communication with other devices. The module integrates a radio transceiver, MAC, baseband, all Wi-Fi protocols, configurations, and network stack. It is suitable for applications such as smart home devices, remote monitoring devices, and medical care instruments. The module features an ARM Cortex-M4 processor running up to 160MHz, with 352KB SRAM and 1MB flash.
Features
- Up to 14 GPIOs
- 4x PWM outputs
- Support IEEE802.11 b/g/n standards
- Support WEP, WPA, and WPA2 encryption
- Support UART, PWM, ADC, GPIO, I2C interfaces
- Working temperature: -10 to +85 °C
- Stamp style SMD for surface mounting production
- Support STA/AP/AP+STA modes
- Support SmartConfig
- Support TLS/SSL protocols
- Support PCB antenna
- 3.3V power supply
- Wi-Fi features: Support 802.11 b/g/n with 20MHz bandwidth, Support station and soft AP, Support Smart Config and AP
- Integrated balun/PA/LNA
- TCP/IP stack optimized for IoT
- Peripherals: 2x UART, 1x I2C, 1x SPI
Applications
- Smart transportation
- Smart home / appliances
- Instruments
- Health care
- Industrial automation
- Intelligent security
- Smart energy
Models
| Model | Antenna Type | Note |
|---|---|---|
| BL3385-P | PCB antenna | Default |
Basic Specifications
Power Consumption
Refer to Table 1 for power consumption data.
| Specifications | Min. | Typ. | Max. | Units |
|---|---|---|---|---|
| VDD1 | 3.3 | 3.6 | V | |
| VIL (input low voltage) | 0 | 0.8 | V | |
| VIH (input high voltage) | 2.0 | 3.6 | V | |
| VOL (output low voltage) | 0.4 | V | ||
| VOH (output high voltage) | 2.4 | 3.6 | V | |
| Io | 10 | mA | ||
| Standby (SP mini) | 80 | 85 | mA | |
| Pulse current @TX (11Mbps, 11b) | 305 | mA | ||
| Pulse current @TX (54Mbps, 11g) | 250 | mA | ||
| Pulse current @TX (65Mbps, 11n) | 225 | mA | ||
| Networking | 305 | mA |
Note: Make sure VDD is not lower than 3.3V.
Working Environment
Refer to Table 2 for working environment data.
| Symbol | Description | Min. | Max. | Units |
|---|---|---|---|---|
| Ts | Storage temperature | -40 | 125 | °C |
| TA | Ambient operating temperature | -10 | 85 | °C |
| Vdd | Supply voltage | 3.3 | 4 | V |
| Vio | Voltage on IO pin | 0 | VDD | V |
| ESD | HBM | 1000 | 2000 | V |
Radio Specifications
Basic Radio Specification
Refer to Table 3 for radio specification.
| Item | Specification |
|---|---|
| Radio range | 2.412 GHz - 2.462 GHz |
| Wireless standards | IEEE 802.11 b/g/n |
| Radio output | 802.11b: 13.83dBm 802.11g: 12.45dBm 802.11n: 12.65dBm BLE: 4.81dBm |
| Antenna type | Internal: PCB antenna External: Not supported |
| Receiving sensitivity | 802.11b: <-89dBm@11Mbps 802.11g: <-76dBm@54Mbps 802.11n: <-73dBm@MCS7 |
| Stack | IPv4, TCP/UDP/FTP/HTTP/HTTPS/TLS/mDNS |
| Data rate (max) | 11M@802.11b, 54M@802.11g, MCS7@802.11n |
| Security | Open/WEP-Open/WPA/WPA2 Encryption algorithm: WEP64/WEP128/TKIP/AES |
| Network types | STA/AP/STA+AP/WIFI Direct |
Radio Performance
IEEE 802.11b
| Item | Specification |
|---|---|
| Modulation Type | DSSS |
| Frequency range | 2412MHz~2462MHz |
| Channel | CH1 to CH11 |
| Data rate | 1, 2, 5.5, 11Mbps |
| TX Characteristics | Min. | Typical | Max. | Unit |
|---|---|---|---|---|
| Power@11Mbps | 13.09 | 13.83 | dBm | |
| Frequency Error | -10 | +10 | ppm | |
| EVM@11Mbps | -15 | dB | ||
| Transmit spectrum mask | Pass |
| RX Characteristics | Min | Typical | Max. | Unit |
|---|---|---|---|---|
| Minimum Input Level Sensitivity (11Mbps, FER8%) | -90 | dBm |
IEEE 802.11g
| Item | Specification |
|---|---|
| Modulation Type | OFDM |
| Frequency range | 2412MHz~2462MHz |
| Channel | CH1 to CH11 |
| Data rate | 6, 9, 12, 18, 24, 36, 48, 54Mbps |
| TX Characteristics | Min. | Typical | Max. | Unit |
|---|---|---|---|---|
| Power@54Mbps | 11.62 | 12.45 | dBm | |
| Frequency Error | -10 | +10 | ppm | |
| EVM@54Mbps | -29 | dB | ||
| Transmit spectrum mask | Pass |
| RX Characteristics | Min. | Typical | Max. | Unit |
|---|---|---|---|---|
| Minimum Input Level Sensitivity (54Mbps) | -77 | dBm |
IEEE 802.11n (20MHz bandwidth)
| Item | Specification |
|---|---|
| Modulation Type | OFDM |
| Frequency range | 2412MHz~2462MHz |
| Channel | CH1 to CH11 |
| Data rate | MCS0/1/2/3/4/5/6/7 |
| TX Characteristics | Min. | Typical | Max. | Unit |
|---|---|---|---|---|
| Power@HT20, MCS7 | 11.82 | 12.65 | dBm | |
| Frequency Error | -10 | +10 | ppm | |
| EVM@HT20, MCS7 | -29 | dB | ||
| Transmit spectrum mask | Pass |
| RX Characteristics | Min. | Typical | Max. | Unit |
|---|---|---|---|---|
| Minimum Input Level Sensitivity (MCS7) | -72 | dBm |
BL3385-P Hardware Information
Footprint Sequence
Figure 1 illustrates the footprint sequence of the BL3385-P module, showing the physical arrangement of pins for surface mounting production.
Footprint Definitions
Table 13 provides the footprint definitions for the BL3385-P module:
| PIN | Function1 | Function2 | Function3 | Function4 | Function5 |
|---|---|---|---|---|---|
| 1 | GND | ||||
| 2 | VDD | ||||
| 3 | RST | ||||
| 4 | GPIO14 | TX0 | |||
| 5 | GPIO13 | RX0 | |||
| 6 | GPIO16 | TX2 | SI-SCL | ||
| 7 | GPIO15 | RX2 | SPI-CS | ||
| 8 | GPIO0 | ||||
| 9 | GPIO17 | PWM0 | PWM5 | PWM6 | |
| 10 | GPIO18 | PWM7 | PWM0 | ||
| 11 | GPIO19 | SPI-MOSI | |||
| 12 | GPIO20 | SPI-MISO | |||
| 13 | VDD | ||||
| 14 | GND |
Notes:
- In default configuration, UART2 (pins 4 and 5) are used for bypass communication, and UART0 (pins 6 and 7) are used for debugging information output and firmware burning. Refer to DC Characteristics for UART output current levels.
- GPIO0 is a hardware function pin; avoid pulling up both pins before powering on.
- If GPIO0 and GPIO13 are pulled up simultaneously, the module enters burning mode after power-on.
PCB Antenna
Figure 2 shows the recommended PCB layout for the BL3385-P's integrated PCB antenna. It is advised to avoid placing any electrical components, wiring, or grounding under the PCB antenna area on the main board, and to leave this area blank on the PCB.
Reference Design
UART Interface Design
For devices with a 3.3V power supply, the device UART port can be directly connected to the module UART port as illustrated in Figure 3 (Circuit diagram 3.3V).
For devices powered by 5V, refer to Figure 4 (Circuit diagram 5V) or design a custom circuit for power conversion. Resistor values can be adjusted based on the actual circuit design.
Power Supply Requirement
If an LDO is used to supply the module with 3.3V, a C1 capacitor of 10uF-22uF is recommended. If a DCDC converter is used, a C1 capacitor of 22uF is recommended.
It is recommended to supply the module with power higher than 400mA to ensure sufficient power and prevent power loss during data transmission.
Revision History
| Date | Version | Updated Content |
|---|---|---|
| June 16, 2021 | 1.0 | Preliminary version |
Copyrights
Use or copying of any part of this manual, including trademarks, models, part numbers, and figures, is prohibited without prior permission.
BroadLink Contact Information
Ms Zhou
Hangzhou Gubei Electronics Technology Co., Ltd.
Address: Room 106, Building 1, No. 611 Jianghong Road, Binjiang District, Hangzhou, P.R.China
Postcode: 310052
Tel: 0571-85071744-8010
Email: bingqi.zhou@broadlink.com.cn
For more information on BroadLink Wi-Fi modules, please visit: www.broadlink.com.cn
FCC/IC Compliance Information
FCC ID: 2ATEV-BL3385-P
IC ID: 25062-BL3385P
CAN ICES-3 (B)/NMB-3(B)
Please note that changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.
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.
This equipment complies with FCC/IC RSS-102 radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with a minimum distance of 20cm between the radiator and your body.
This device complies with Industry Canada licence-exempt 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 présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radioexempts de licence. L'exploitation est autorisée aux deux conditions suivantes : (1) l'appareil ne doit pas produire de brouillage, et (2) l'utilisateur de l'appareil doit accepter tout brouillage radioélectrique subi, même si le brouillage est susceptible d'en compromettre le fonctionnement.
This equipment complies with FCC/IC RSS-102 radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance 20cm between the radiator & your body. ce matériel est conforme aux limites de dose d'exposition aux rayonnements, FCC / CNR-102 énoncée dans un autre environnement. cette equipment devrait être installé et exploité avec distance minimale de 20 entre le radiateur et votre corps.
(1) Operational use conditions
Module has professional users use condition limitations. Host product manufacturer please ensure giving such warning like "Product is limited to professional users use" in your product's instruction.
(2) Antenna used
| Antenna Type | Brand/manufacturer | Model No. | Max. Antenna Gain |
|---|---|---|---|
| PCB | Hangzhou BroadLink Technology Co.,Ltd | / | 2dBi |
(3) Notice to Host Product Manufacturer
Any deviation(s) from the defined parameters of the antenna trace, as described by this instruction, host product manufacturer must notify BroadLink that you wish to change the antenna trace design. In this case, a Class II permissive change application is required to be filed by BroadLink, or you (host manufacturer) can take responsibility through the change in FCC ID and IC ID (new application) procedure followed by a Class II permissive change application.
(4) Labelling Instruction for Host Product Integrator
Please notice that if the FCC and IC 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 FCC ID: 2ATEV-BL3385-P" and "Contains IC: 25062-BL3385P" any similar wording that expresses the same meaning may be used. § 15.19 and RSS-Gen Labelling requirements shall be complied on end user device. Labelling rules for special device, please refer to §2.925, § 15.19 (a)(5) and relevant KDB publications. For E-label, please refer to §2.935.
(5) Installation Notice to Host Product Manufacturer
The OEM integrator is responsible for ensuring that the end-user has no manual instruction to remove or install module. The module is limited to installation in mobile application; a separate approval is required for all other operating configurations, including portable configurations with respect to §2.1093 and different antenna configurations.
(6) Antenna Change Notice to Host manufacturer
If you desire to increase antenna gain and either change antenna type or use same antenna type certified, a Class II permissive change application is required to be filed by BroadLink, or you (host manufacturer) can take responsibility through the change in FCC ID and IC ID (new application) procedure followed by a Class II permissive change application.
(7) FCC other Parts, Part 15B Compliance Requirements for Host product manufacturer
This modular transmitter is only FCC authorized for the specific rule parts listed on the grant. 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. Host manufacturer in any case shall ensure the host product, which is installed and operating with the module, is in compliant with Part 15B requirements. Please note that for a Class B or Class A digital device or peripheral, the instructions furnished in the user manual of the end-user product shall include the statement set out in §15.105 Information to the user or such similar statement and place it in a prominent location in the text of the host product manual.
Original texts as following:
For Class B: 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: --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.
For Class A: Note: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense.
