The **TF552B** (often identified as the **TF552B-TA3**) is a high-sensitivity, high-speed infrared (IR) receiver module commonly used for remote control systems. It is part of a family of miniaturized receivers that integrate a photodiode and a preamplifier into a single component. --- ### 1. Key Internal Components The TF552B is not just a sensor; it is an Integrated Circuit (IC) that contains several sub-components to process light signals into digital data: | Component | Function | | :--- | :--- | | **Photodiode** | Converts infrared light (typically 950nm) into an electrical current. | | **Preamplifier** | Boosts the weak signal from the photodiode. | | **Automatic Gain Control (AGC)** | Adjusts sensitivity to compensate for ambient light noise. | | **Band Pass Filter** | Filters out all frequencies except the carrier frequency (38kHz). | | **Demodulator** | Strips the carrier wave to output the original digital pulse. | --- ### 2. Technical Specifications The "552" series generally operates at a specific carrier frequency, which is critical for matching with a remote control transmitter. | Parameter | Typical Value | | :--- | :--- | | **Carrier Frequency** | 38.0 kHz | | **Supply Voltage (Vcc)** | 2.5V to 5.5V | | **Supply Current** | ~0.35 mA (Low power consumption) | | **Peak Sensitivity Wavelength** | 950 nm | | **Transmission Distance** | Up to 45 meters (depending on conditions) | | **Output Type** | Active Low (Logic 0 when IR is detected) | --- ### 3. Pin Configuration The device typically features three pins. Looking at the front (the side with the sensor lens), the pinout is generally as follows: 1. **OUT:** The demodulated output signal (connects to a microcontroller). 2. **GND:** Ground (0V). 3. **Vcc:** Power supply (Positive). --- ### 4. Implementation Circuit To use the TF552B in an electronic circuit, it is recommended to add a simple RC filter to the power line to suppress power supply noise, which can cause false triggers. ```cpp // Basic Arduino Connection Example // Pin 1 (OUT) -> Digital Pin 2 // Pin 2 (GND) -> GND // Pin 3 (Vcc) -> 5V (with 100 ohm resistor and 4.7uF capacitor) int irPin = 2; void setup() { pinMode(irPin, INPUT); Serial.begin(9600); } void loop() { if (digitalRead(irPin) == LOW) { Serial.println("IR Signal Detected!"); } } ``` --- ### 5. Common Applications * **Consumer Electronics:** TV, DVD players, and Air Conditioning units. * **Robotics:** Obstacle detection or remote command reception. * **Industrial:** Light barriers and counters.