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PDF ELM622 Data sheet ( Hoja de datos )

Número de pieza ELM622
Descripción Infrared Remote Interpreter
Fabricantes ELM Electronics 
Logotipo ELM Electronics Logotipo



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ELM622
Infrared Remote Interpreter
Description
The ELM622 is an interface circuit for converting
infrared control codes to an eight bit serial format.
This device is well suited to applications that only
require occasional input from humans, or where a
hidden interface is desired.
When connected to a standard infrared receiver
module, the ELM622 continually scans the data
stream for Sony™ television control codes. If
detected, the codes are retransmitted serially, with
hardware handshaking. This data can then be used
directly by logic circuits, or suitably buffered and
transmitted on a standard RS232 connection.
For convenience, some of the control codes are
translated to their ASCII equivalents before
retransmission, allowing direct display of the
common control signals on an ASCII terminal.
Many products that currently rely on a keyboard
for input can benefit from the small size and
simplicity that an ELM622 provides, and several
others are likely to benefit from the at-a-distance
control that this circuit offers.
Applications
• Alternative to keyboard interface
www.DataSheeHt4idUd.ceonmsecurity system control
• Non-contact device control for safety
• Home automation receiver
Features
• Low power CMOS design - typically 1mA at 5V
• RS232 formatted output at 9600 baud
• Hardware handshaking provided
• Signal received output for visual feedback
• Simple interface to standard receiver modules
• Works with universal TV remote transmitters
• Reset output on command
• High current drive outputs - up to 25 mA
Connection Diagram
PDIP and SOIC
(top view)
VDD
Tx
RTS
CTS
1
2
3
4
8 VSS
7 Reset
6 LED
5 IRRx
Block Diagram
IRRx 5
Data
Decoder
Code
Translator
RS232
Encoder
LED 6
99999
Detector
100ms
Pulse
Generator
2 Tx
3 RTS
4 CTS
7 Reset
ELM622DSA
Elm Electronics – Circuits for the Hobbyist
< http://www.elmelectronics.com/ >
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ELM622 pdf
ELM622
Example Application
Figure 1 shows an example circuit using the
ELM622. Keypresses on a television remote control
transmitter are received by this circuit, interpreted, and
retransmitted to a monitoring computer.
The television remote control used is one of the low
cost universal types, set to generate Sony™ codes. This
is often the default power-up mode for most of these
remotes. Output is by way of a simple one transistor
RS232 connection, with no handshaking. The auxiliary
reset output is not used in this case, and power for the
entire circuit is provided by a 5 volt regulated supply.
Operation is straight-forward. When a button on the
remote is pressed, the serial data stream is detected by
the infrared module and passed onto the ELM622 as a
series of negative-going pulses. The data is then
decoded, and if found to contain a Sony™ control code,
is retransmitted. The type of receiver modules required
are commonly available on the market, and are
manufactured by companies such as Sharp™ or
LiteOn™. A 40KHz module is required for a Sony™
infrared remote, although 38KHz ones have been used
successfully.
In operation, ambient light can occasionally cause
an infrared receiver’s bias level to drift towards VSS,
possibly tripping the ELM622’s Schmitt trigger input. As
the receiver output drifts high again, the Schmitt trigger
may not always reset, so that it might appear that there
is carrier present when it is not. This condition is
accounted for within the integrated circuit by
momentarily changing pin 5 to a high level output before
taking any measurements, thus reseting the trigger. The
series resistor must be used on pin 5 to protect both
circuits during this momentary high level pulse. Typically
a value of 4.7Kis sufficient.
The output of the ELM622 is shown coupled to a
monitoring computer through a simple one transistor
buffer circuit. The circuit uses the computer’s idle
transmit line as a source of negative voltage, and
includes a diode for protection from backfeeds. Output
connections are made through a standard DB25 female
modem type connector with the pin numbers as shown.
This is all that is required to receive control codes
from a standard infrared remote control, and to transmit
them to a computer. At the computer, the data can be
displayed using a terminal program, used to control the
computer, or possibly used to control other devices.
Alternatively, the ELM622 could simply be connected
directly to a microcontroller, providing a very low parts
count alternative to the use of keyboards...
+5V
www.DataSheet4U.com
+12V
0.1µF
78L05
+5V
0.1µF
10K
18
27
36
45
40 KHz IR
Receiver
4.7K
2N3906
3
4.7K
7
1N4001
2
DB25F
Connector
560
LED
ELM622DSA
Figure 1. Infrared to RS232 Circuit
Elm Electronics – Circuits for the Hobbyist
< http://www.elmelectronics.com/ >
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