The **BL-R313P** is a compact, high-performance Wireless Network Interface Card (NIC) module, commonly used in embedded systems, IPCs (Industrial PCs), and smart home appliances. It is manufactured by Bilian (B-Link) and is based on the **Realtek RTL8188EUS** chipset. --- ### 1. Key Technical Specifications The following table outlines the core electronic and operational characteristics of the module: | Feature | Specification | | :--- | :--- | | **Chipset** | Realtek RTL8188EUS | | **Interface** | USB 2.0 (High Speed) | | **Wireless Standards** | IEEE 802.11b/g/n | | **Frequency Range** | 2.4GHz ~ 2.4835GHz | | **Data Rate** | Up to 150Mbps (1T1R) | | **Operating Voltage** | 3.3V ±0.2V | | **Antenna Type** | External (Requires connection via IPEX or Solder Pad) | | **Modulation** | OFDM/CCK/16-QAM/64-QAM | --- ### 2. Physical and Electrical Layout The BL-R313P is designed as a **Stamp Hole (Castellated)** module, allowing it to be soldered directly onto a carrier PCB without additional connectors. #### Main Components: * **Realtek RTL8188EUS Chip:** The brain of the module, handling the MAC, Baseband, and Radio. * **Crystal Oscillator:** Usually 40MHz, providing the clock signal for the wireless circuitry. * **RF Front-End:** Includes matching circuits to ensure 50Ω impedance for the antenna output. * **LDO / Power Management:** On-board regulation to manage the 3.3V input. --- ### 3. Pinout Description The module typically features a 4-pin to 6-pin interface for basic operation: 1. **VDD (3.3V):** Power supply input. 2. **USB_D-:** USB data negative signal. 3. **USB_D+:** USB data positive signal. 4. **GND:** Ground. 5. **RF_OUT:** Antenna output pin (if not using a dedicated connector). 6. **CHIP_EN:** Enable pin (High = Active, Low = Power Down). --- ### 4. Typical Applications Because of its small form factor and USB interface, it is frequently integrated into: * **OTT Boxes:** Android TV boxes and IPTV systems. * **IP Cameras:** Providing Wi-Fi connectivity for security footage. * **Printers:** Enabling wireless printing capabilities. * **Single Board Computers (SBCs):** Adding Wi-Fi to boards that lack integrated radios. --- ### 5. Implementation Requirements ```c /* Software Consideration: Driver Support */ // The RTL8188EUS chipset is widely supported. // For Linux-based systems, the '8188eu' or 'r8188eu' kernel module is required. // For Windows/Android, specific Realtek vendor drivers must be compiled/installed. ```