ELM622
Infrared Remote Interpreter
Description
Features
The ELM622 is an interface circuit for converting
• Low power CMOS design - typically 1mA at 5V
• RS232 formatted output at 9600 baud
• Hardware handshaking provided
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.
• Signal received output for visual feedback
• Simple interface to standard receiver modules
• Works with universal TV remote transmitters
• Reset output on command
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.
• High current drive outputs - up to 25 mA
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.
Connection Diagram
PDIP and SOIC
(top view)
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.
1
2
3
4
8
7
6
5
VDD
Tx
VSS
Reset
LED
IRRx
Applications
RTS
CTS
• Alternative to keyboard interface
• Hidden security system control
• Non-contact device control for safety
• Home automation receiver
Block Diagram
Data
Decoder
Code
Translator
RS232
Encoder
5
IRRx
2
Tx
3
4
RTS
CTS
6
LED
100ms
Pulse
Generator
99999
Detector
7
Reset
ELM622DSA
Elm Electronics – Circuits for the Hobbyist
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