The **TSOP22..WE1** series belongs to a family of miniaturized IR receiver modules designed for infrared remote control systems. These components integrate a photodiode and a preamplifier into a single lead frame, encapsulated in an epoxy package that acts as an IR filter. --- ### 1. Key Internal Components The "WE1" suffix typically refers to a specific lead-bend configuration (often a surface-mount or winged lead style), but the internal electronics remain consistent across the series: | Component | Function | | :--- | :--- | | **Photodiode** | Converts IR light signals into electrical current. | | **Preamplifier** | Boosts the weak signal from the photodiode. | | **AGC (Automatic Gain Control)** | Adjusts sensitivity to suppress noise from ambient light (fluorescent lamps, etc.). | | **Band Pass Filter** | Blocks all frequencies except the specific carrier frequency (e.g., 38kHz). | | **Demodulator** | Strips the carrier wave to output the original binary data signal. | --- ### 2. Technical Specifications The TSOP22 series is known for its low power consumption and high immunity against ambient light interference. | Parameter | Typical Value | | :--- | :--- | | **Operating Voltage** | 2.5 V to 5.5 V | | **Supply Current** | 0.7 mA | | **Carrier Frequency** | 30 kHz to 56 kHz (depends on the model number) | | **Transmission Distance** | Up to 45 meters | | **Directivity** | Half angle $\phi = \pm 45^\circ$ | --- ### 3. Pinout Configuration Most TSOP22 modules use a standard 3-pin interface. While you should always check the specific datasheet for the "WE1" mechanical drawing, the logical pins are: 1. **OUT:** Data output (Active Low; remains HIGH when no signal is detected). 2. **GND:** Ground connection. 3. **V_s:** Power supply (2.5V - 5.5V). --- ### 4. Circuit Implementation To ensure stable operation, a basic RC filter is recommended at the supply voltage pin to prevent noise from the power line affecting the sensitive preamplifier. ```c // Typical Connection Diagram // [IR Receiver] [Microcontroller] // Pin 1 (OUT) ---> Digital Input (e.g., GPIO 2) // Pin 2 (GND) ---> GND // Pin 3 (Vs) ---> VCC (with 100 Ohm resistor + 4.7uF Cap) ``` --- ### 5. Part Number Breakdown * **TSOP:** Vishay IR Receiver family. * **22:** Refers to the specific internal IC design (Generation 2). * **[Frequency]:** (e.g., TSOP2238) The last two digits indicate the carrier frequency in kHz. * **WE1:** Mechanical package variation (Winged/Bent leads for specific PCB mounting).