RPM973-H11E2A Sensors, Transducers

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Obsolete
Data Rate:	4Mbs (FIR)
Voltage - Supply:	2.4V ~ 3.6V
Idle Current, Typ @ 25°C:	1mA
Link Range, Low Power:	--
Orientation:	Side View
Operating Temperature:	-25°C ~ 85°C
Size:	6.80mm x 2.44mm x 1.70mm
Standards:	IrDA 1.4
Shutdown:	--

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Introduction

Infrared Data Association (IrDA) transceivers, such as the RPM973-H11E2A, are integrated circuits that are used to transmit and receive infrared signals between two systems. Such transmissions are typically employed in short-to-medium range applications, with the majority of usage taking place within the wireless consumer electronics space. The IrDA protocol is designed to limit inter-system interference, and provide fast and reliable transfer speeds over short distances. In this article, we will discuss the application fields and working principles of the RPM973-H11E2A infrared transceiver module.

Application Fields

The RPM973-H11E2A is often used in various consumer electronics and home automation applications. It provides reliable wireless communication between two systems while also limiting interference from other nearby systems. Due to its low power consumption and low cost, it is a popular choice for remote control devices, such as television remotes, and proximity sensors, such as those used in motion-activated lighting. In addition, it is often used in garage door openers, security systems, and other applications that require reliable high-speed communications over short distances. Furthermore, the innate small form-factor of the module makes it suitable for embedded applications, where circuit board space is at a premium.

Working Principles

The RPM973-H11E2A is an Infrared Data Association (IrDA) transceiver module, meaning it is specifically designed for point-to-point communications between two devices, using infrared light as the signal medium. The operating principles of such modules are similar to those of other RF-based transceivers, such as Bluetooth or Wi-Fi. The module is able to detect and transmit infrared signals in the roughly 940nm wavelength range. It is capable of transmission speeds up to 3Mbps with tristate encoding, meaning data is encoded so it can be read regardless of the orientation of the receiving system. Furthermore, the module takes advantage of a collision detection protocol, allowing multiple systems to communicate over one frequency without interference.

When operating, the module requires two separate components. The first is a light-emitting diode (LED), which emits the light required for communication. This LED is powered by a constant current source, such as the one built into the module, and typically requires a voltage between 2.7 and 3.5V. The second component is a light-sensitive transistor (LST) which receives the incoming infrared signals and sends them to the module\'s I/O pins. The transistor is biased to the same voltage as the LED, ensuring the module is able to detect incoming signals without interference. Finally, the transmission speed is determined in part by the LED\'s frequency range. By rapidly cycling the LED on and off at different frequencies, the speed of the transmission increases. The module also features a temperature compensation circuit, allowing the module to work properly even in rapid temperature changes, such as those found in automotive applications.Conclusion

The RPM973-H11E2A is an infrared (IrDA) transceiver module designed to provide reliable wireless communications between two systems over short to medium distances. The module utilizes a light-emitting diode (LED) and light-sensitive transistor (LST) to detect and transmit infrared signals in the 940nm wavelength range and is capable of transmission speeds up to 3Mbps. Because of its low power consumption, small form-factor, and collision detection protocol, the module is a popular choice for remote control applications, proximity sensors, and embedded projects.

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