The **BL-R4536** is a high-performance, low-power Wi-Fi module based on the **Realtek RTL8188EUS** (or sometimes RTL8188ETV) chipset. It is widely used in set-top boxes, IP cameras, and smart home appliances due to its small form factor and USB 2.0 interface. --- ## 1. Core Technical Specifications The module operates on the 2.4GHz ISM frequency band and adheres to international wireless networking standards. | Feature | Specification | | :--- | :--- | | **Chipset** | Realtek RTL8188EUS | | **Interface** | USB 2.0 (High Speed) | | **Wireless Standard** | IEEE 802.11b/g/n | | **Frequency Range** | 2.400GHz ~ 2.4835GHz | | **Data Rate** | Up to 150Mbps (1T1R) | | **Operating Voltage** | 3.3V ±0.2V | | **Antenna Type** | External (via I-PEX connector or solder pad) | --- ## 2. Pin Configuration (Electronic Pins) The BL-R4536 typically utilizes a 4-pin or 6-pin layout for power and data transmission. 1. **VDD (3.3V):** Main power supply input. 2. **USB_D-:** USB differential data line (Negative). 3. **USB_D+:** USB differential data line (Positive). 4. **GND:** Ground. 5. **CHIP_EN / RST (Optional):** Chip enable or Reset pin to control power states. 6. **WPS / LED (Optional):** Status indicator output or configuration trigger. --- ## 3. Key Electronic Characteristics ### Power Consumption The module is designed for efficiency, often used in battery-operated or energy-sensitive devices. * **Transmit Mode:** ~130mA to 150mA. * **Receive Mode:** ~90mA to 110mA. * **Deep Sleep:** < 10mA. ### RF Output Power * **802.11b:** 17dBm ±1.5dBm. * **802.11g:** 14dBm ±1.5dBm. * **802.11n:** 13dBm ±1.5dBm (HT20/HT40). --- ## 4. Hardware Integration Requirements To ensure stable electronic performance, the following design considerations are required: * **Decoupling Capacitors:** A 10uF and a 0.1uF capacitor should be placed as close to the VDD pin as possible to filter noise. * **Impedance Control:** The USB data lines ($D+$ and $D-$) should be routed as a differential pair with **90Ω differential impedance**. * **RF Trace:** The path to the antenna must maintain a **50Ω characteristic impedance** to prevent signal reflection and loss. ---