ncv33161 ON Semiconductor, ncv33161 Datasheet - Page 10

• Manufacturer Part Number: ncv33161
• Description: Universal Voltage Monitors
• Manufacturer: ON Semiconductor

The above figure shows the MC34161 configured as a positive voltage window detector. This is accomplished by connecting channel 1 as an undervoltage detector,
and channel 2 as an overvoltage detector. When the input voltage V
falls within the window, V
With the dashed line output connection, the LED will turn `ON' when the input voltage V
For known resistor values, the voltage trip points are:
The above figure shows the MC34161 configured as a negative voltage window detector. When the input voltage -V
and V
ground and falling below V
For known resistor values, the voltage trip points are:
Input V
Output
Voltage
Pins 5, 6
Input -V
Output
Voltage
Pins 5, 6
V
V
1
2
V
V
V
V
+ (V
+ V
1
2
3
4
4
, the LED will turn `ON'. As the input voltage falls within the window, -V
+
+
+
+
S
S
R
R
(R
(R
th1
th1
CH1
CH2
CH1
1
1
CH2
1
1
(V
(V
R
* V
) R
) R
R
GND
GND
th2
2
th2
GND
GND
V
1
V
) R
R
CC
R
V
V
V
V
) R
CC
H1
V
V
V
V
* V
* V
2
2
2
4
3
2
1
3
1
2
3
4
)(V
)(V
R
) R
)
3
3
2
`ON'
ref
H2
th1
th1
`ON'
R
) 1
R
S
)
3
1
* V
3
* V
* V
3
increasing from ground and exceeding V
) V
R
) R
, the LED will turn `OFF'. With the dashed line output connection, the LED will turn `ON' when the input voltage -V
3
V
ref
ref
H1
Hys2
th2
2
)
)
) 1
* V
) V
LED `OFF'
LED `OFF'
) V
V
Hys1
ref
th2
th1
)
V
V
* V
) V
3
4
V
+ (V
+ V
Hys1
H2
th1
V
Hys2
Figure 21. Negative Voltage Window Detector
Figure 20. Positive Voltage Window Detector
th2
* V
th2
MC34161, MC33161, NCV33161
LED `ON'
* V
LED `ON'
R
H1
2
R
) R
H2
1
)
3
R
) 1
2
R
`OFF'
) R
2
`OFF'
S
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1
, or V
falls out of the window established by V
3
) 1
S
decreasing from the peak towards ground and falling below V
S
LED `ON'
LED `ON'
increasing from ground and exceeding V
10
S
is within the window.
For a specific trip voltage, the required resistor ratio is:
R
R
R
For a specific trip voltage, the required resistor ratio is:
R
R
R
R
R
R
R
3
2
1
-V
R
R
R
R
3
2
1
V
2
1
2
1
2
2
1
1
S
S
R
R
R
R
+
+
) R
) R
) R
) R
1
1
3
3
V
V
V
V
1
3
3
2
2
3
1
4
2
1
7
2
3
1
7
2
3
(V
(V
x V
x V
and V
+
+
+
+
th2
th1
+
+
+
+
V
V
V
V
V
V
V
V
th2
th2
th1
th1
* V
* V
4
1
2
3
4
1.27V
1.27V
1.27V
1.27V
+
-
, the LED will turn `ON'. As the input voltage
+
-
+
+
-
-
* V
* V
* V
) V
S
th2
th1
2
* V
* V
* V
* V
, or -V
falls out of the window established by V
H2
H1
* 1
th2
th2
th1
H1
)
)
ref
H2
ref
H1
* 1
Reference
* V
Reference
) V
S
+
+
* V
* V
+
+
4
4
2.54V
decreasing from the peak towards
2.54V
2.8V
0.6V
th1
2.8V
0.6V
H2
+
-
+
-
+
-
+
-
ref
ref
8
8
V
V
R
R
R
R
CC
CC
3
1
3
1
3
+
+
, the LED will turn `OFF'.
S
V
V
V
is within the window.
3
4
2
(V
(V
V
x V
1
1
2
(V
* V
* V
th2
6
5
6
5
th1
th1
th2
* V
)
) V
H2
)
H1
1
)