IRDA PHY

Hii sir, I Wants to get the Information About the physical Layer of the Infrared Data Communication ?

IrDA was established in 1993 to set and support hardware and software standards which create infraredcommunications links. The Association's charter is tocreate an interoperable, low-cost, low-power, halfduplex, serial data interconnection standard that supports a walk-up, point-to-point user model that isadaptable to a wide range of applications and devices.


Technology

Infrared (IR) communications is based on technologywhich is similar to the remote control devices such asTV and entertainment remote controls used in most
homes today. IR offers a convenient, inexpensive andreliable way to connect computer and peripheraldevices without the use of cables. IrDA connectivity is


IRDA Transmission

The simplest way of optical interfacing in the SIRmode is shown in figure 1. For pulse shaping andrecovery, the Vishay Semiconductors device
TOIM4232 is recommended. The front end including
transmitter and receiver should be realized for example by the integrated transceiver module TFDU4100r other devices of the 4000 series. The TFDU4100can also be directly connected to Super I/Os.


Specification :

In SIR mode, the data is represented by optical pulsesbetween 1.6 μs and 3/16 of the bit length of theRS232 data pulse in SIR mode. Pulse-length reduction is also applied in the higher frequency modes.The limits of the standards are shown in tables 1 and
3. The optical radiant intensity and detector sensitivityare adjusted to guarantee a point-to-point transmission in a cone of r 15q over a distance of at least 1 m.
The radiant intensity and the sensitivity of the frontend can be increased to ensure a transmission over 3 m (see figure 3). Data from the optical interfacestandard are documented in tables 2 to 4.




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