MC33161 查看數據表（PDF） - ON Semiconductor
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MC33161 Datasheet PDF : 18 Pages
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MC34161, MC33161, NCV33161
V2
Input VS
V1
GND
Output VCC
Voltage
Pins 5, 6 GND
VHys
Osc ‘ON’
VS
R2
R1
VCC
8
2.54V
1
Reference
7
+
2+ −
1.27V
+
3+ −
1.27V
−
++
2.8V
−
++
0.6V
4
RA
Piezo
6
5
CT
RB
The above figure shows the MC34161 configured as an overvoltage detector with an audio alarm. Channel 1 monitors input voltage VS while channel 2 is connected
as a simple RC oscillator. As the input voltage increases from ground, the output of channel 1 allows the oscillator to turn ‘ON’ when VS exceeds V2.
For known resistor values, the voltage trip points are:
ǒ Ǔ ǒ Ǔ V1 + (Vth * VH)
R2
R1
)
1
V2 + Vth
R2
R1
)
1
For a specific trip voltage, the required resistor ratio is:
R2
R1
+
Vth
V1
*
VH
*
1
R2
R1
+
V2
Vth
*
1
Figure 24. Overvoltage Detector with Audio Alarm
Input VS
V2
V1
GND
Output VCC
Voltage
Pin 5 GND
Output VCC
Voltage
Pin 6 GND
VHys
tDLY
Reset LED ‘ON’
VS
R2
R1
VCC
8
2.54V
1
Reference
7
+
2+ −
1.27V
+
3+ −
1.27V
−
++
2.8V
−
++
0.6V
4
R3
6
RDLY
5
CDLY
The above figure shows the MC34161 configured as a microprocessor reset with a time delay. Channel 2 monitors input voltage VS while channel 1 performs the
time delay function. As the input voltage decreases towards ground, the output of channel 2 quickly discharges CDLY when VS falls below V1. As the input voltage
increases from ground, the output of channel 2 allows RDLY to charge CDLY when VS exceeds V2.
For known resistor values, the voltage trip points are:
ǒ Ǔ ǒ Ǔ V1 + (Vth * VH)
R2
R1
)
1
V2 + Vth
R2
R1
)
1
For a specific trip voltage, the required resistor ratio is:
R2
R1
+
Vth
V1
*
VH
*
1
R2
R1
+
V2
Vth
*
1
For known RDLY CDLY values, the reset time delay is:
tDLY = RDLYCDLY In
1
Vth
1 − VCC
Figure 25. Microprocessor Reset with Time Delay
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