1. Introduction
The HLK-7628NE module from Hi-Link Electronics is a cost-effective and low-power 300M IoT module. It is built around the MediaTek MT7628NN chipset, offering robust processing capabilities and a wide array of interfaces. This module is designed to support Linux and OpenWrt operating systems, enabling custom development for various smart devices and cloud service applications.
It is suitable for secondary development in applications such as gateways, robotics, and other electronic devices requiring WiFi connectivity.
2. Specifications
The HLK-7628NE module offers the following key features and specifications:
- MCU Main Frequency: Up to 580MHz
- Wireless Speed: 300Mbps
- WiFi Standard: IEEE 802.11b/g/n
- Channel Bandwidth: 20/40 MHz
- Operating Modes: Supports AP, STA, and AP+STA mixed mode
- Network Ports: 5 10/100M adaptive Ethernet ports (1 WAN, 4 LAN)
- USB Interface: 1 USB2.0 host interface
- Peripheral Interfaces: SPI, I2C, I2S, PCM, UART, JTAG, GPIO
- IoT Application: Widely used in IoT devices
- Power Management: Built-in powerful PMU (Power Management Unit)
- BSSID Support: Supports 16 Multiple BSSID
- Encryption Methods: WEP64/128, TKIP, AES, WPA, WPA2, WAPI
- Quality of Service: Supports QoS, WMM, WMM-PS
- Operating Systems: Supports Linux 2.6.36 SDK, OpenWrt 14.07
2.1 Detailed Parameters
| Item | Parameter | Remarks |
|---|---|---|
| Model number | HLK-7628N | |
| Main chipset | MT7628NN | |
| Kernel | MIPS24KEc | |
| Main frequency | 580MHz | |
| Memory | DDR2 64MB | Customizable (32MB, 128MB) |
| Flash | 16MB | Customizable (8MB, 32MB) |
| Temperature | Ambient: -40℃ ~ 85℃ | |
| Humidity | Use: 10~95% (non-condensing) Store: 5~95% (non-condensing) | |
| Size | 18.5mm × 35.5mm × 2.5mm | Tolerance ±0.5mm |
Figure 1: Detailed Specifications Table
2.2 Interface Overview
| Interface | Module Interface Availability | Default Firmware Support |
|---|---|---|
| WiFi standard | IEEE 802.11b/g/n | Support |
| Ethernet | 5 10M/100M adaptive | 1WAN, 4LAN |
| UART | 3 channels | 2-way UART with transparent transmission function |
| SDIO | 1 channel | Not support |
| SPI | 1 channel | Not support |
| I2C | 1 channel | Not support |
| I2S | 1 channel | Not support |
| PWM | 1 channel | Not support |
| GPIO | More than 8 channels | Defined function |
Figure 2: Interface Availability and Support
2.3 Module Architecture
The block diagram below illustrates the internal architecture of the HLK-7628N module, highlighting the MT7628NN chipset and its connections to various components and interfaces.
Figure 3: HLK-7628N Module Architecture Diagram
3. Setup and Installation
The HLK-7628NE module is designed for integration into larger systems or for use with a test kit. This section provides guidance for initial setup.
3.1 Module Overview
The module itself is a compact PCB with the MT7628NN chipset, RAM, and Flash memory. It features a metal shield for EMI protection and pin headers for connectivity.
Figure 4: HLK-7628NE Module
The module dimensions are approximately 35.2mm x 18.7mm.
Figure 5: HLK-7628NE Module Dimensions
3.2 Using the Test Kit (if applicable)
For development and testing, the HLK-7628NE module can be used with a dedicated test board. The test kit typically includes the module, a test board, antennas, and a power adapter.
Figure 6: HLK-7628NE Test Kit
To set up the test kit:
- Carefully insert the HLK-7628NE module into the designated slot on the test board. Ensure correct orientation and secure connection.
- Connect the antennas to the IPEX connectors on the test board.
- Connect the power adapter to the test board's power input.
- Connect Ethernet cables to the LAN/WAN ports as required for your network configuration.
- The test board provides access to various interfaces for debugging and development.
Figure 7: Module on Test Board
Figure 8: Module and Patch Panel Connection
4. Operating Instructions
The HLK-7628NE module supports Linux and OpenWrt operating systems, allowing for flexible configuration and application development.
4.1 Software Development
The module comes with an SDK for Linux 2.6.36 and OpenWrt 14.07. Developers can utilize these environments for custom firmware and application development.
- OpenWrt: A popular embedded operating system for routers and embedded devices. It provides a fully writable filesystem with package management.
- Linux SDK: Offers a robust environment for developing custom applications and drivers.
Refer to the official Hi-Link documentation and community resources for detailed programming guides and examples.
4.2 Network Configuration
When used as a router or gateway, the default firmware typically configures one WAN port and four LAN ports. Access the module's web interface (if provided by default firmware) or command-line interface (CLI) via serial console or SSH to configure network settings, WiFi parameters, and other functionalities.
Default IP Address: (Typically 192.168.1.1 or similar, check specific firmware documentation)
Default Login: (Typically root/admin, check specific firmware documentation)
4.3 Video Overview
Watch this video for a visual overview of the HLK-7628NN module, its production process, and packaging.
5. Maintenance
To ensure optimal performance and longevity of your HLK-7628NE module, follow these maintenance guidelines:
- Environmental Conditions: Operate the module within the specified ambient temperature range of -40℃ to 85℃ and humidity range of 10% to 95% (non-condensing). Avoid extreme temperatures and high humidity.
- Power Supply: Ensure a stable and clean power supply (3.3V) to prevent damage to the module.
- Physical Handling: Handle the module with care, especially when inserting or removing it from a test board or custom PCB. Avoid applying excessive force.
- Firmware Updates: Regularly check for firmware updates from Hi-Link or the OpenWrt community to benefit from bug fixes, security patches, and new features. Follow official update procedures carefully.
- Cleaning: Keep the module and its connectors clean and free from dust and debris. Use a soft, dry brush or compressed air for cleaning. Avoid liquid cleaners.
6. Troubleshooting
This section provides basic troubleshooting steps for common issues.
6.1 No Power/Module Not Responding
- Check Power Supply: Verify that the power supply is connected correctly and providing the specified 3.3V.
- Connection: Ensure the module is securely seated in its socket or connected to the development board.
- LED Indicators: Observe any LED indicators on the module or test board. Refer to the specific firmware documentation for LED behavior.
6.2 WiFi Connectivity Issues
- Antenna Connection: Ensure antennas are properly connected to the IPEX connectors.
- Firmware Configuration: Check WiFi settings in the firmware (SSID, password, channel, mode).
- Interference: Minimize interference from other 2.4GHz devices.
6.3 Network Port Issues
- Cable Connection: Verify Ethernet cables are securely connected to the correct LAN/WAN ports.
- Link Lights: Check link/activity LEDs on the Ethernet ports.
- Firmware Configuration: Ensure network interface configurations (IP addresses, DHCP, routing) are correct in the firmware.
6.4 User Tips
- Custom Firmware: For advanced users, exploring custom OpenWrt builds can unlock additional features and optimizations.
- Heat Management: While designed for a wide temperature range, ensure adequate airflow, especially when integrating into compact enclosures, to prevent overheating during heavy loads.
- Documentation: Always refer to the latest official documentation and community forums for the most up-to-date information and support.
7. Warranty and Support
For warranty information, technical support, and further inquiries, please contact Hi-Link Electronics directly or refer to their official website.
Hi-Link Electronics is a high-tech enterprise specializing in R&D, production, and sales of IoT modules, including AC DC/DC DC power modules, WiFi modules, and Human presence radar modules. They also support APP customization.
Contact Information: (Refer to manufacturer's official website for current contact details)
Certifications: CE, FCC, RoHS
