MC33161 Просмотр технического описания (PDF) - Motorola => Freescale
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MC33161 Datasheet PDF : 16 Pages
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MC34161 MC33161
Figure 23. Overvoltage Detector with Audio Alarm
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.
+ * ǒ ) Ǔ + ǒ ) Ǔ For known resistor values, the voltage trip points are:
V1
(Vth
VH)
R2
R1
1 V2
Vth
R2
R1
1
For a specific trip voltage, the required resistor ratio is:
+ * * + * R2
R1
V1
Vth VH
1
R2
R1
V2
Vth
1
Input VS
V2
V1
Gnd
Output VCC
Voltage
Pin 5
Gnd
Output VCC
Voltage
Pin 6
Gnd
Figure 24. Microprocessor Reset with Time Delay
VCC
8
VHys
tDLY
Reset LED ‘ON’
VS
R2
R1
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.
+ * ǒ ) Ǔ + ǒ ) Ǔ For known resistor values, the voltage trip points are:
V1
(Vth
VH)
R2
R1
1
V2
Vth
R2
R1
1
For a specific trip voltage, the required resistor ratio is:
+ * * + * R2
R1
V1
Vth VH
1
R2
R1
V2
Vth
1
For known RDLY CDLY values, the reset time delay is:
tDLY = RDLYCDLY In
1
1
–
Vth
VCC
MOTOROLA ANALOG IC DEVICE DATA
11
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