TSOP75238WTR

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Optical sensors play an important role in detection and communication. One of the most common applications of optical sensors is Photo Detectors, which convert light signals into voltage signals or electrical signals. Remote Receiver is a type of Photo Detector, by combining the infrared light-emitting diode and the infrared photodiode to receive or transmit infrared signals, allowing two or more electronic devices to communicate with each other with infrared signal. And TSOP75238WTR is one of the remote receivers.

TSOP75238WTR

TSOP75238WTR is a kind of remote receiver with integrated antenna, designed for general remote control systems in automobiles, home appliances and consumer electronic goods. It is a single channel, push-pull output remote control sensor IC, and can be operated with a variety of infra-red modulation codes. The device has a valid sensing range of up to 10 meters. The sensory cell in TSOP75238WTR consists of a PIN photodiode and an integrated pre-amplifier which forms a transimpedance amplifier. The dominant feature of the device is its small size and low power consumption. The device is housed in a 3 pin package of only 5-in-2 mm and is designed to drive directly the base of a power transistor.

Application Field

Optical sensors have various applications in the world today, from detecting obstacles and measuring distances, to sensing hazardous gases in the air. TSOP75238WTR is a special optical sensor, which finds the most applications in remote control system, from automobiles, home appliances to consumer electronic goods.

Generally, TSOP75238WTR optical sensor is used in an environmental-monitoring system in the car, which uses infrared remote control to monitor and detect the external environment. The sensing system uses an infrared light-emitting diode (LED) as a light source, and a photodiode that converts the assumed light signals into electrical signals. The input signals are transmitted to the microcontroller for further analysis.

Working Principle

TSOP75238WTR is a remote receiver with integrated antenna, and it is integrated with the photodiode receiver. It receives and amplifies infrared signals and converts them to an electrical signal, which encodes the information. When receiving an infrared signal from the remote control, the infrared light-emitting diode shoots infrared light into the environment, and the pin photodiode inside the TSOP75238WTR sensor collects that information in the form of light. This infrared light then becomes infrared energy to be converted and amplified. The energy is then converted into electric signals which are further processed by the microcontroller and used to drive the required components.

The TSOP75238WTR sensor is designed to detect infrared radiation with specific modulation frequency, between 36-44 KHz, which is transmitted by the remote control. When the device senses the particular modulation frequency, the output pin of the IC goes high and when it doesn’t, the output pin goes low. The output of the IC is connected to the microcontroller, which analyzes the information collected from the sensor and depending on the values obtained, decides the necessary action to be taken.

Conclusion

TRSOP75238WTR is a kind of optical sensor, which falls into the category Photo Detectors – Remote Receiver, and is often used to detect and receive infrared light signals for remote control systems. Compared with other optical sensors, TSOP75238WTR sensor has a valid sensing range up to 10 meters, and requires only low power consumption and small size for operation. And this sensor finds its applications in Automobiles, Home Appliances, and consumer electronics. When it receives an infrared signal from the remote control, the infrared light-emitting diode shoots infrared light, which is picked up by the pin photodiode, and then amplified and converted into electric signals. The output of the IC is then connected to the microcontroller to finally process the signals for various tasks.

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