TSOP75238TT

Optical Sensors - Photo Detectors - Remote ReceiverTSOP75238TT Application Field and Working Principle: TSOP75238TT is an advanced version of the popular TSOP75238 series of infrared photo-detectors, which are used in a wide variety of consumer electronics applications. It is a digital optical detector designed for the reception of coded infrared signals from remote control devices, such as television, set-top box, and radio. This article will discuss the application field and working principle of TSOP75238TT. Application Field: TSOP75238TT is widely used in consumer electronic products, from controlling TV receivers to controlling household appliances. Its applications include consumer remote controls, TV set-top box remote controls, home video game consoles, car audio systems, keyless entry systems, security alarm systems, and many other remote control applications. Working Principle: TSOP75238TT consists of an infrared-sensitive photodiode whose output is connected to a transimpedance amplifier. When the device is exposed to an infrared signal from a remote control, the photodiode absorbs the infrared energy and generates a very small current. The transimpedance amplifier converts this current into a voltage which is then sampled by the internal logic. If the signal is a valid remote control code, the logic output is asserted and the data is decoded and read out.The TSOP75238TT is designed to operate at a wavelength of 940nm, which is the wavelength used for most consumer infrared remote control devices. The sensing element contains a small filtering capacitor which ensures that only signals at the 940nm wavelength will be detected, thus providing better immunity against false triggering from other sources of infrared such as sunlight. The device has a very wide detection angle, up to 90 degrees, and is designed to provide superior immunity to ambient light and EMI noise. To ensure maximum sensing performance, a special shielding is used to reduce the effect of external light or EMI noise. The TSOP75238TT also features a built-in power-on reset circuit which ensures that the output is in a low state when the device is powered up. This feature allows the device to be used in multiple-sensor applications, where only one output is high at any given time. In summary, the TSOP75238TT is a versatile, digital photo-detector suitable for a wide variety of consumer products. It provides superior immunity from ambient light and EMI noise, and its wide detection angle and power-on reset circuit make it suitable for use in multiple-sensor applications.