## Overview of the TSOP34536 The **TSOP34536** is a miniaturized IR receiver module designed for infrared remote control systems. It belongs to the Vishay TSOP34x series, which is widely recognized for its high sensitivity and ability to suppress ambient noise (such as sunlight or fluorescent lighting). --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Carrier Frequency** | 36 kHz | | **Supply Voltage ($V_S$)** | 2.5 V to 5.5 V | | **Supply Current ($I_S$)** | 0.35 mA (typical) | | **Transmission Distance** | Up to 45 meters | | **Output Type** | Active Low | | **Operating Temperature** | -25°C to +85°C | --- ### 2. Internal Components & Block Diagram The TSOP34536 is not just a sensor; it is an integrated circuit (IC) that contains several stages to process IR signals: 1. **Photodetector:** A high-speed PIN diode that converts IR light pulses into electrical current. 2. **Preamplifier:** Boosts the weak signal from the photodiode. 3. **Automatic Gain Control (AGC):** Dynamically adjusts the sensitivity to filter out constant light sources (noise) while focusing on pulsed signals. 4. **Band Pass Filter:** Specifically tuned to **36 kHz** to ensure only the intended remote control carrier frequency is processed. 5. **Demodulator:** Removes the 36 kHz carrier and outputs a clean digital square wave corresponding to the remote's data code. --- ### 3. Pin Configuration The device typically comes in a 3-pin lead frame package: | Pin Number | Symbol | Function | | :--- | :--- | :--- | | 1 | **OUT** | Data Output (Connects to MCU) | | 2 | **GND** | Ground | | 3 | **$V_S$** | Power Supply | --- ### 4. Application Circuit (Best Practices) To ensure stable operation, a simple RC filter is recommended at the supply pin to eliminate power supply ripples. ```text V_S (2.5V - 5.5V) | [R1: 100Ω] | +-------+-------+ (Pin 3: Vs) | | [C1] [TSOP] (Pin 1: OUT) ---> To Microcontroller 4.7uF | | | GND-----+-------+ (Pin 2: GND) ``` ### 5. Features and Advantages * **High Immunity:** Specifically designed to ignore optical noise from CFL lamps and sunlight. * **Compatibility:** Supports most common IR protocols like RC5, RC6, and Panasonic. * **Low Power:** Very low current consumption makes it ideal for battery-powered devices. ---