## Understanding the TSOP931..P10TR Series The **TSOP931..P10TR** is a series of miniaturized infrared (IR) receiver modules designed for remote control systems. These components integrate a photodiode, preamplifier, and signal conditioning circuitry into a single SMD (Surface Mount Device) package. ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Component Type** | IR Receiver Modules for Remote Control | | **Supply Voltage ($V_S$)** | 2.0 V to 3.6 V | | **Supply Current ($I_S$)** | 0.35 mA (typical) | | **Transmission Distance** | Up to 40 meters | | **Carrier Frequency** | 30 kHz to 56 kHz (depends on specific model) | | **Directivity** | $\pm$ 45 degrees | | **Package Style** | Heimdall (SMD) | --- ### 2. Internal Functional Blocks The device is not just a sensor; it is an Integrated Circuit (IC) that performs several steps to ensure the signal is "clean" for a microcontroller: 1. **Photodetector:** Converts IR light pulses into electrical current. 2. **Preamplifier:** Boosts the weak signal from the photodiode. 3. **Automatic Gain Control (AGC):** Adjusts sensitivity to compensate for ambient light or distance. 4. **Band Pass Filter:** Only allows frequencies near the carrier frequency (e.g., 38kHz) to pass, blocking sunlight and CFL bulb interference. 5. **Demodulator:** Removes the carrier wave and outputs the data signal (TTL/CMOS compatible). --- ### 3. Pin Configuration and Application Most TSOP931 series modules utilize a standard 3-pin interface for easy integration into electronic circuits. | Pin Number | Name | Function | | :--- | :--- | :--- | | **1** | **OUT** | Demodulated data output (Active Low) | | **2** | **GND** | Ground connection | | **3** | **$V_S$** | Supply voltage input | #### Typical Application Circuit ```c // Schematic representation [3.3V] --- [Resistor 100Ω] --- Pin 3 (Vs) | [Capacitor 0.1μF] --- [GND] | [Microcontroller GPIO] <------- Pin 1 (OUT) | [GND] ------------------------- Pin 2 (GND) ``` --- ### 4. Significant Advantages * **Low Power Consumption:** Ideal for battery-operated devices. * **High Immunity:** Specifically designed to suppress noise from fluorescent lamps and Wi-Fi signals. * **Small Footprint:** The "P10TR" indicates a specific SMD tape and reel packaging, suitable for automated pick-and-place assembly.