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ELM339 데이터시트 PDF




ELM에서 제조한 전자 부품 ELM339은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


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부품번호 ELM339 기능
기능 INFRARED REMOTE CONTROL
제조업체 ELM
로고 ELM 로고


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ELM339 데이터시트, 핀배열, 회로
ELM339
Infrared Remote Control
Description
The ELM339 is a complete remote control
decoder in an 8 pin package. With the addition of a
standard infrared receiver module, three individual
outputs can be simultaneously controlled using a
television remote control transmitter.
This circuit responds to Sony™ television control
codes, chosen because most universal remotes
default to them when initially powered up. The
ELM339 continuously monitors the stream of data
from an infrared receiver module looking for these
Sony type remote control codes. If an appropriate
three digit code is detected, the selected output
either turns on, turns off, or switches its state.
One of the outputs can be configured to provide
a 250msec pulse output, if desired. This could be
useful for interfacing to devices that expect a
momentary input, such as garage door controls,
alarm test buttons, and some appliances.
Applications
• Basic home automation systems
• Remote smoke alarm test initiator
• Garage door controller
• Lamp controller
Features
• Low power CMOS design - typically 1mA at 5V
• Three separate outputs
• Pulse output for momentary controls
• Signal received output for visual feedback
• Easy interface to standard receiver modules
• Works with universal TV remote transmitters
• High current drive outputs - up to 25 mA
Connection Diagram
PDIP and SOIC
(top view)
VDD
Out5
Out7
Pulse7
1
2
3
4
8 VSS
7 Out3
6 LED
5 IRRx
Block Diagram
IRRx 5
Data
Decoder
LED 6
Output
Driver
Output
Driver
Output
Driver
7 Out3
2 Out5
3 Out7
Pulse7 4
ELM339DSA
Elm Electronics – Circuits for the Hobbyist
< http://www.elmelectronics.com/ >
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ELM339 pdf, 반도체, 판매, 대치품
ELM339
Example Application
Figure 1 shows a typical control circuit that uses the
ELM339. Relays are driven by each of the outputs,
providing isolation, and current carrying capability.
Transistor buffers are used to interface the circuit to the
12V relays.
All three of the outputs are used in the latching
mode, in this case. Converting Out7 (pin 3) to pulse
mode is easily accomplished by connecting pin 4 to 5V
rather than circuit common as shown. No other circuit
changes would be required.
Circuit operation is straight-forward. A serial data
stream is detected by the infrared module and passed
onto the ELM339 as a series of negative-going pulses.
The data is then decoded, and if found to contain the
correct Sony™ control code sequence, the state of the
selected output will be altered. The receiver modules
required are commonly available on the market, and are
manufactured by companies such as Sharp™ or
1N4001
+12V
12V Relay
Output “7”
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 ELM339’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.
Power supplies for this application are standard.
Regulated 5V is provided for the logic circuits, while
unregulated 12V is used for the relay coils.
1N4001
+12V
12V Relay
Output “5”
2.2K
2N3904
+12V
0.1µF
78L05
+5V
0.1µF
40 KHz IR
Receiver
2N3904
2.2K
1N4001
+12V
12V Relay
Output “3”
18
27
36
45
4.7K
2.2K
2N3904
560
LED
ELM339DSA
Figure 1. Three Output Remote Control
Elm Electronics – Circuits for the Hobbyist
< http://www.elmelectronics.com/ >
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