NJU7181
– 8 –
Scenario 3:
Trigger Signal detected (Case 1)
– Output will be or maintain high when either an input signal or trigger signal is detected. The
delay circuit will only be activated when both signals is not present. Output is set to Low state when
a delay time passes. Output is set to High state when either an input signal or trigger signal is detected
again.
Power
LOW
LOW
High
Power On
Delay TIme : T
delay
Case 1: Trigger signal present (Afteroutput LOW)
Trigger
Trigger detected
Signal Detected
High due to triggger
Audio Signal Input
DC Output
(NJU7181)
Delay TIme : T
delay
LOW
Scenario 4:
Trigger Signal detected (Case 2)
– Output will be or maintain high when either an input signal or trigger signal is detected. When
hold time is shorter than a delay time, output maintains High state (Counter RESET). NJU7181 will then
hold the output level for a delay time which can be adjusted by the Capacitor value @ pin 5.
Power
LOW
High
Power On
Hold Time
Case 2: Trigger signal present (Duringoutput HIGH)
Trigger
Trigger detected
Signal Detected
When hold time is shorter than T
delay
,
DC_Output maintains High state.
(Counter RESET)
Audio Signal Input
DC Output
(NJU7181)
DelayTIme : T
delay
LOW
