资料介绍
Infrared light, commonly referred to as “IR”, is a com-
mon, easy-to-use, low power and low-cost media to
transmit information. Among the few “wireless” commu-
nication choices, IR has the significant advantage of
compatibility with hundreds of millions of electronic
devices with IR ports (i.e., laptop PCs, PDAs).
The vast majority of IR-capable devices are compatible
with a set of standards established by the Infrared Data
Association, or IrDA
®
. These standards include guide-
lines for implementing the IR Physical Layer (IrDA
Serial Infrared Physical Layer specification), ensuring
that IR communication can be established through free
space between two dissimilar devices.
This document describes the fundamentals of the
infrared physical layer, the IrDA standard and selecting
the proper discrete emitter and photodiode
components for circuit implementation.M AN243
Fundamentals of the Infrared Physical Layer
To understand the steradian, we will first consider the
Author: Paul Barna
radian. The radian is defined as the angle ‘a’ that
Microchip Technology Inc.
Steve Schlanger produces an arc ‘S’ that is equal in length to the radius
‘R’ and is equal to 360/2π degrees (~ 57° 17’ 46.6”).
Aegis Technologies LLC
The arc is created by
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