The **TSOP131..P10TR** series represents a family of miniaturized IR receiver modules designed for infrared remote control systems. These components integrate a photo detector and a preamplifier into a single lead frame. --- ### 1. Key Technical Specifications The ".." in the part number typically denotes the carrier frequency (e.g., TSOP13138 corresponds to 38 kHz). | Feature | Specification | | :--- | :--- | | **Supply Voltage ($V_S$)** | 2.5 V to 5.5 V | | **Supply Current ($I_S$)** | 0.35 mA (typical) | | **Carrier Frequency** | 30 kHz to 56 kHz (model dependent) | | **Transmission Distance** | Up to 45 meters | | **Directivity** | $\pm$ 45 degrees (half angle) | | **Package Type** | Belobog (Surface Mount - SMD) | --- ### 2. Internal Block Diagram Functions The internal circuitry is sophisticated, allowing the sensor to distinguish between valid remote signals and ambient noise. * **Photodiode:** Converts infrared light pulses into electrical current. * **Preamplifier:** Amplifies the weak signal from the photodiode. * **Automatic Gain Control (AGC):** Adjusts sensitivity to compensate for ambient light interference (like sunlight or fluorescent bulbs). * **Band Pass Filter:** Only allows signals at the specific carrier frequency (e.g., 38 kHz) to pass through. * **Demodulator:** Removes the carrier frequency, leaving only the data "envelope" as a digital output. --- ### 3. Pin Configuration The TSOP131..P10TR usually follows a standard 3-pin layout for SMD mounting: | Pin Number | Name | Function | | :--- | :--- | :--- | | **1** | **OUT** | Demodulated digital output (Active Low) | | **2** | **GND** | Ground connection | | **3** | **$V_S$** | Positive supply voltage | --- ### 4. Implementation Circuit To ensure stability, a simple RC filter is recommended at the supply pin to prevent power supply ripples from causing false triggers. ```cpp // Typical Arduino hookup logic int irPin = 2; // Connected to Pin 1 (OUT) of TSOP void setup() { pinMode(irPin, INPUT); Serial.begin(9600); } void loop() { int signal = digitalRead(irPin); if (signal == LOW) { // IR Pulse detected Serial.println("IR Signal Received"); } } ``` --- ### 5. Part Number Suffix Breakdown: "P10TR" * **P10:** Refers to the specific mechanical molding or lead bending style (Pin 1 to Pin 3 spacing/orientation). * **TR:** Stands for **Tape and Reel**, indicating the component is packaged for automated pick-and-place assembly machines. ---