– 93 –
Approx.
420μs.
5V
Fig. 4-1
[Typical communication waveform]
Approx. 400 ms.
Enlarged reception waveform
Fig. 4-2
4. Remote control reception circuit
・An infrared signal from the remote control unit is converted to an electrical signal by the remote
control light-receiving unit (IC821) and is received by the microcomputer. Data is transmitted as
digital data 0 and 1 by changing the interval of the basic pulses at about 420μs.
ⅠC821
VOUT
GND
VDD
C821
R822
C822
ZD821
R821
Q821
12V
0V
R640 R823
C632
Remote control
reception input
Microcomputer
IC601
Remote control
light-receiving unit
Remote control reception input
(pin ^6 of microcomputer)
Beep (reception tone)
66
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