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參數(shù)資料
| 型號(hào)： | ELM339 |
| 廠(chǎng)商： | Electronic Theatre Controls, Inc. |
| 英文描述： | INFRARED REMOTE CONTROL |
| 中文描述： | 紅外遙控器 |
| 文件頁(yè)數(shù)： | 4/4頁(yè) |
| 文件大小： | 27K |
| 代理商： | ELM339 |
Example Application
4 of 4
Figure 1. Three Output Remote Control
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
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 V
SS
,
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 4.7K
is 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.
ELM339
ELM339DSA
< http://www.elmelectronics.com/ >560
4.7K
78L05
LED
+12V
0.1μF
1
2
3
4
8
7
6
5
+5V
0.1μF
2.2K
2N3904
1N4001
+12V
12V Relay
2N3904
1N4001
+12V
12V Relay
2.2K
2N3904
1N4001
Output “7”
+12V
12V Relay
Output “5”
Output “3”
40 KHz IR
Receiver
2.2K
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