The **BL-RX1115** is a high-performance, low-power wireless receiver module typically used in the **2.4 GHz ISM band**. It is frequently integrated into wireless keyboard/mouse combos, remote controls, and custom IoT data transmission systems. --- ### ## 1. Key Specifications Below are the primary technical parameters of the BL-RX1115 module: | Parameter | Specification | | :--- | :--- | | **Operating Voltage** | 1.9V to 3.6V DC | | **Frequency Range** | 2.400 GHz - 2.4835 GHz | | **Modulation Type** | GFSK (Gaussian Frequency Shift Keying) | | **Data Rate** | Up to 2 Mbps | | **Interface** | SPI (Serial Peripheral Interface) or I2C | | **Sensitivity** | -85 dBm to -90 dBm | | **Standby Current** | < 1.0 µA | --- ### ## 2. Core Electronic Components The module is composed of several critical electronic sub-sections: * **Main SoC/IC:** The heart of the module is usually a proprietary CMOS chip that integrates the RF transceiver, a frequency synthesizer, and a baseband modem. * **Crystal Oscillator:** A high-precision crystal (typically 12MHz or 16MHz) provides the reference clock for the RF frequency generation. * **Antenna System:** * Most versions use a **PCB Trace Antenna**, which is etched directly onto the board to save space. * Matching circuits (inductors and capacitors) ensure maximum power transfer and minimal signal reflection (VSWR). * **Passive Components:** SMD resistors and MLCC capacitors are used for power supply decoupling (to reduce noise) and bias settings. --- ### ## 3. Pinout and Connection While specific board layouts may vary, the standard BL-RX1115 pin configuration usually includes: 1. **VDD:** Power Input (3.3V typical). 2. **GND:** Ground. 3. **MOSI/MISO/SCK:** SPI data lines for communication with a microcontroller (MCU). 4. **CSN:** Chip Select (Active Low). 5. **IRQ:** Interrupt Request pin to signal the MCU when data is received. --- ### ## 4. Application Logic The BL-RX1115 operates by listening for GFSK-modulated packets. Once a packet matches the pre-configured address, it de-modulates the signal, verifies the CRC (Cyclic Redundancy Check), and stores the payload in its internal RX FIFO buffer for the host MCU to read via SPI.