📄 菲利普rc5红外遥控协议.mht
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Date: Tue, 26 Oct 2004 09:18:04 +0800
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<META=20
content=3D"pic16f84 i2c rc5 JVC panasonic daewoo sony infrared remote =
protocol code"=20
name=3Dkeywords>
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<TR>
<TD width=3D607 height=3D50><FONT size=3D5><B><FONT =
color=3D#333333>Phillips RC5=20
infrared remote protocol =
page</FONT></B></FONT></TD></TR></TBODY></TABLE>
<TABLE cellSpacing=3D3 cellPadding=3D0 width=3D640 border=3D0>
<TBODY>
<TR>
<TD width=3D634><FONT size=3D2>Most audio and video systems are =
equipped with=20
an infrared remote control.</FONT></TD></TR>
<TR>
<TD width=3D634><FONT size=3D2>A common used standard protocol for =
infrared=20
data communication is the RC5 code, originally</FONT></TD></TR>
<TR>
<TD width=3D634><FONT size=3D2>developed by Phillips. This code has =
an=20
instruction set of 2048 different instructions and is divided into =
32=20
address</FONT></TD></TR>
<TR>
<TD width=3D634><FONT size=3D2>of each 64 instructions. Every kind =
of=20
equipment use his own address,</FONT></TD></TR>
<TR>
<TD width=3D634><FONT size=3D2>so this makes it possible to change =
the volume=20
of the TV without change the volume of the hifi.</FONT></TD></TR>
<TR>
<TD width=3D634><FONT size=3D2>The transmitted code is a dataword =
wich=20
consists of 14 bits and is defined as:</FONT></TD></TR>
<TR>
<TD width=3D634><FONT size=3D2></FONT></TD></TR>
<TR>
<TD width=3D634><FONT size=3D2>2 startbits for the automatic gain =
control in=20
the infrared receiver.</FONT> </TD></TR>
<TR>
<TD width=3D634><FONT size=3D2>1 toggle bit (change everytime when a =
new=20
button is pressed on the ir transmitter)</FONT></TD></TR>
<TR>
<TD width=3D634><FONT size=3D2>5 address bits for the=20
systemaddress</FONT></TD></TR>
<TR>
<TD width=3D634><FONT size=3D2>6 instructionbits for the pressed=20
key</FONT></TD></TR>
<TR>
<TD width=3D634> </TD></TR>
<TR>
<TD width=3D634><FONT size=3D2><IMG height=3D291=20
src=3D"http://users.pandora.be/davshomepage/diagrams/rc5dia.JPG"=20
width=3D445></FONT></TD></TR>
<TR>
<TD width=3D634> </TD></TR>
<TR>
<TD width=3D634><FONT size=3D2>The RC5 code uses the bifase =
modulation technic=20
which means that every bit consists of 2 parts which are never the =
same.</FONT></TD></TR>
<TR>
<TD width=3D634><FONT size=3D2>So a bit is always a high/low or a =
low/high=20
transisition. By the RC5 code a 1 is a low high =
transisition</FONT></TD></TR>
<TR>
<TD width=3D634><FONT size=3D2>and a 0 is high low transisition. For =
all the=20
bits the most significant bit is transmitted =
first.</FONT></TD></TR>
<TR>
<TD width=3D634><FONT size=3D2>Remember also that the outputsignal =
of the=20
integrated receivers is inverted: </FONT></TD></TR>
<TR>
<TD width=3D634><FONT size=3D2>Detecting an IR signal the output of =
the=20
integrated receiver will be 0V.</FONT></TD></TR>
<TR>
<TD width=3D634><FONT size=3D2>The duration time of each bit is =
equal to 1,778=20
ms, and the total time of a full rc5 code is 24,778 =
ms.</FONT></TD></TR>
<TR>
<TD width=3D634><FONT size=3D2>The space between two transmitted =
codes is 50=20
bit times or 88,889ms.</FONT></TD></TR>
<TR>
<TD width=3D634><FONT size=3D2>To improve noise rejection the pulses =
are=20
modulated at a carrier frequence</FONT></TD></TR>
<TR>
<TD width=3D634><FONT size=3D2>The carrier frequency of the rc5 code =
is 36 kHz=20
so take always a receiver with a response </FONT></TD></TR>
<TR>
<TD width=3D634><FONT size=3D2>frequency of 36 kHz. =
</FONT></TD></TR>
<TR>
<TD width=3D634><FONT size=3D2>There are plenty of Detectors for =
receiving the=20
bitstream of an IR remote control but the best </FONT></TD></TR>
<TR>
<TD width=3D634><FONT size=3D2>I ever used is the TSOP1836 of =
VISHAY. (<A=20
=
href=3D"http://users.pandora.be/davshomepage/datasheets/tsop1836.pdf"=20
target=3D_blank>Datasheet</A> available on my =
site).</FONT></TD></TR>
<TR>
<TD width=3D634><FONT size=3D2>The TSOP1836 is a 3 pin device that =
receives=20
the infrared bursts and gives out the demodulated bitstream at the =
output.</FONT></TD></TR>
<TR>
<TD width=3D634 height=3D11><A=20
href=3D"http://users.pandora.be/davshomepage/index.htm" =
target=3D_parent><FONT=20
size=3D2>Back to =
homepage</FONT></A></TD></TR></TBODY></TABLE></BODY></HTML>
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