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Circuit Descriptions
When power is supplied to MICOM, reset circuit
initializes RAM and other parts on MICOM to
initialize all programs. Reset voltage maintains “low”
for hundreds of µsec comparing to MICOM Vcc
voltage when power is input. It also maintains
“high”(5V) during normal operation. But, when Vcc
drops to 3.4V-3.7V, reset port becomes “low”.
Port
Vcc
Reset
Voltage
5V
5V
1) If door is open, door S/W contact is closed. Then MICOM receives “low” signal and detects
door open then, Relay control circuit receives “HIGH” signal and turn Lamp on.
2) If door is closed, door S/W contact is open. Then MICOM receives “high” signal and detects
door close then, Relay control circuit receives “LOW” signal and turn Lamp off.
DOOR
F
R
Door Conditions
CLOSE
OPEN
CLOSE
OPEN
Door S/W Contact
OPEN
CLOSE
OPEN
CLOSE
MICOM
PIN NO
# 39
# 40
Micom Input Voltage
“HIGH”
“LOW”
“HIGH”
“LOW”
9-3)Reset Circuit
9-4) Door S/W Circuit
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