The **BL-R453T** is a highly integrated, low-cost Wireless Local Area Network (WLAN) module. It is primarily designed to provide Wi-Fi connectivity to devices via a USB interface. Below is a breakdown of its electronic components, specifications, and architecture. --- ### 1. Core Architecture The module is based on the **Realtek RTL8188FTV** chipset. This is a single-chip solution that combines a MAC (Media Access Control), a 1T1R (1 Transmit, 1 Receive) baseband, and an RF transceiver. | Component | Description | | :--- | :--- | | **Main Chipset** | Realtek RTL8188FTV | | **Interface** | USB 2.0 (High Speed) | | **Antenna** | External via Pin or Printed PCB Antenna | | **Frequency Band** | 2.412GHz ~ 2.484GHz | --- ### 2. Key Electronic Specifications The BL-R453T operates on the IEEE 802.11b/g/n standards. Its electronic performance is defined by the following parameters: * **Operating Voltage:** 3.3V DC (±0.2V). * **Throughput:** Up to 150Mbps (using 802.11n 40MHz bandwidth). * **Modulation Techniques:** * 802.11b: CCK, DQPSK, DBPSK. * 802.11g/n: 64-QAM, 16-QAM, QPSK, BPSK. * **Power Consumption:** Typically ranges from 120mA (standby) to 190mA (active transmission). --- ### 3. Pin Configuration (Hardware Interface) The module usually features a small form factor (approx. 12.3mm x 13mm) with a specific pinout for integration onto a carrier board. | Pin Number | Name | Type | Description | | :--- | :--- | :--- | :--- | | 1 | **GND** | Power | Ground connection | | 2 | **USB_D-** | I/O | USB Differential Data Negative | | 3 | **USB_D+** | I/O | USB Differential Data Positive | | 4 | **3.3V** | Power | Main Power Supply | | 5 | **CHIP_EN** | Input | Module Enable (High: On / Low: Off) | --- ### 4. RF Characteristics To maintain signal integrity, the module includes several passive electronic components (capacitors and inductors) for impedance matching. * **Transmit Power:** < 18dBm (802.11b) / < 15dBm (802.11n). * **Receiver Sensitivity:** -88dBm (1Mbps) to -70dBm (MCS7). * **Impedance:** The RF output is matched to **50 Ohms**. --- ### 5. Common Applications Due to its low power consumption and USB interface, it is commonly found in: 1. **OTT Boxes:** Android TV boxes and streaming sticks. 2. **IP Cameras:** Providing wireless uplinks for security video. 3. **Smart Appliances:** Refrigerators or washing machines requiring IoT connectivity. 4. **Portable Devices:** Handheld terminals or tablets.