### Overview of the TSSP570..H Series The **TSSP570..H** is a member of the infrared (IR) sensor module family manufactured by **Vishay Semiconductors**. Unlike standard IR receivers used for remote controls (which look for specific data protocols), the TSSP series is designed for **object detection, proximity sensing, and light barrier applications**. --- ### Key Technical Specifications | Feature | Description | | :--- | :--- | | **Function** | IR Receiver for Proximity and Light Barrier | | **Carrier Frequency** | 38 kHz or 56 kHz (depending on specific model) | | **Supply Voltage ($V_S$)** | 2.5 V to 5.5 V | | **Supply Current ($I_S$)** | Typ. 0.7 mA | | **Transmission Distance** | Up to 8 meters (using TSAL6200 emitter) | | **Output Type** | Active Low (CMOS/TTL compatible) | | **Package Style** | Surface Mount (SMD) / Belobog Package | --- ### Internal Block Diagram Components The "H" in the part number indicates a specific package style (Side View or Top View orientation depending on the sub-variant). Internally, the part contains: 1. **Photo Diode:** Converts incoming IR light into electrical signals. 2. **Preamplifier:** Boosts the weak signal from the diode. 3. **Automatic Gain Control (AGC):** Adjusts sensitivity to filter out 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 burst of IR pulses into a simple logic HIGH or LOW signal. --- ### Pin Configuration The device typically features 4 pins (though 3 are functional): | Pin Number | Name | Function | | :--- | :--- | :--- | | 1 | **OUT** | Data Output (Connects to Microcontroller) | | 2 | **GND** | Ground | | 3 | **$V_S$** | Power Supply (2.5V - 5.5V) | | 4 | **NC** | Not Connected (Physical support only) | --- ### Typical Application Circuit To ensure stable operation, a simple RC filter is recommended for the power supply line to filter out ripples. ```cpp // Example: Basic logic for proximity detection using an Arduino int sensorPin = 2; // Connected to OUT of TSSP570 void setup() { pinMode(sensorPin, INPUT); Serial.begin(9600); } void loop() { int val = digitalRead(sensorPin); if (val == LOW) { Serial.println("Object Detected!"); } delay(100); } ``` --- ### Distinctive Features of the "H" Series * **High Sensitivity:** Optimized for detecting reflected light from surfaces. * **Fixed Gain:** Unlike TV remote receivers that have variable gain to adapt to distance, the TSSP570 has a more consistent threshold, making it better for measuring if an object is within a fixed range. * **Robustness:** High immunity against DC light (sunlight) and optical noise. ---