The **TSSP58038** (and the broader TSSP580 series) is a compact infrared (IR) receiver module designed for sensor applications, proximity sensing, and light barrier systems. Unlike standard IR receivers used for remote controls (which filter out continuous signals), the TSSP series is optimized to detect continuous IR bursts. --- ## 1. Technical Specifications The following table summarizes the key electrical and physical characteristics of the TSSP58038. | Parameter | Specification | | :--- | :--- | | **Carrier Frequency** | 38 kHz (Standard for TSSP58038) | | **Supply Voltage (Vs)** | 2.0 V to 5.5 V | | **Supply Current (Is)** | 0.7 mA (typical) | | **Transmission Distance** | Up to 25 meters | | **Directivity** | Angle of half sensitivity: $\pm$ 45° | | **Output Type** | Active Low (CMOS/TTL compatible) | | **Dimensions** | 5.0 mm x 6.95 mm x 4.8 mm | --- ## 2. Internal Block Diagram Functional Components The TSSP580 series integrates several electronic components into a single three-pin package: 1. **Photodiode:** A high-speed PIN photodiode that converts IR light into an electrical signal. 2. **Preamplifier:** Boosts the weak signal from the photodiode. 3. **Automatic Gain Control (AGC):** Adjusts sensitivity to compensate for ambient light noise. 4. **Band Pass Filter:** Specifically tuned to the carrier frequency (e.g., 38 kHz) to reject interference from sunlight or fluorescent bulbs. 5. **Demodulator:** Converts the high-frequency burst into a simple digital pulse. --- ## 3. Key Electronic Features ### Reflective and Proximity Sensing Unlike the TSOP series (Remote Control receivers), the TSSP580 does not have a "burst length" limitation. It can receive a **continuous carrier signal**. This makes it ideal for: * **Reflective Sensors:** Detecting if an object is in front of the sensor by bouncing IR light off it. * **Light Barriers:** Detecting when an object breaks a continuous beam between an IR LED and the receiver. ### Low Power Consumption The module is designed for battery-operated devices, consuming less than 1mA during operation, making it highly efficient for "always-on" sensing. ### Pin Configuration The device uses a standard 3-pin layout: 1. **OUT:** Data output (connects to MCU). 2. **GND:** Ground. 3. **Vs:** Power Supply. --- ## 4. Basic Application Circuit To ensure stable operation, a simple RC filter is recommended for the power supply to suppress ripples. ```cpp // Schematic Concept: // [Vs] ---- [100 Ohm Resistor] ----+---- [Pin 3: Vs] // | // [4.7uF Capacitor] // | // [GND] ---------------------------+---- [Pin 2: GND] // // [Pin 1: OUT] ------------------------- [MCU Input Pin] ```