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MC33161 Schematic ( PDF Datasheet ) - ON Semiconductor

Teilenummer MC33161
Beschreibung (MC33161 / MC34161) Universal Voltage Monitors
Hersteller ON Semiconductor
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Gesamt 18 Seiten
MC33161 Datasheet, Funktion
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MC34161, MC33161,
NCV33161
Universal Voltage Monitors
The MC34161/MC33161 are universal voltage monitors intended
for use in a wide variety of voltage sensing applications. These devices
offer the circuit designer an economical solution for positive and
negative voltage detection. The circuit consists of two comparator
channels each with hysteresis, a unique Mode Select Input for channel
programming, a pinned out 2.54 V reference, and two open collector
outputs capable of sinking in excess of 10 mA. Each comparator
channel can be configured as either inverting or noninverting by the
Mode Select Input. This allows over, under, and window detection of
positive and negative voltages. The minimum supply voltage needed
for these devices to be fully functional is 2.0 V for positive voltage
sensing and 4.0 V for negative voltage sensing.
Applications include direct monitoring of positive and negative
voltages used in appliance, automotive, consumer, and industrial
equipment.
Features
Unique Mode Select Input Allows Channel Programming
Over, Under, and Window Voltage Detection
Positive and Negative Voltage Detection
Fully Functional at 2.0 V for Positive Voltage Sensing and 4.0 V
for Negative Voltage Sensing
Pinned Out 2.54 V Reference with Current Limit Protection
Low Standby Current
Open Collector Outputs for Enhanced Device Flexibility
NCV Prefix for Automotive and Other Applications Requiring Site
and Control Changes
Pb−Free Packages are Available
VCC
8
1 2.54V
Reference
VS 7
2
+
++
2.8V
+−
1.27V
3
+
++
0.6V
+−
1.27V
6
5
4 This device contains
141 transistors.
Figure 1. Simplified Block Diagram
(Positive Voltage Window Detector Application)
© Semiconductor Components Industries, LLC, 2006
June, 2006 − Rev. 9
1
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MARKING
DIAGRAMS
PDIP−8
P SUFFIX
CASE 626
8
MC3x161P
AWL
YYWWG
11
8
SOIC−8
3x161
D SUFFIX
ALYW
CASE 751
1
G
1
8
Micro8t
x161
DM SUFFIX
AYW G
CASE 846A
G
1
1
x = 3 or 4
A = Assembly Location
WL, L = Wafer Lot
YY, Y = Year
WW, W = Work Week
G or G = Pb−Free Package
(Note: Microdot may be in either location)
PIN CONNECTIONS
Vref 1
Input 1 2
Input 2 3
GND 4
8 VCC
7 Mode Select
6 Output 1
5 Output 2
(TOP VIEW)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 15 of this data sheet.
Publication Order Number:
MC34161/D






MC33161 Datasheet, Funktion
MC34161, MC33161, NCV33161
Vref
1
Mode Select
7
Input 1
2+
+
1.27V
Input 2
3+
+
1.27V
VCC
8
2.54V
Reference
++
2.8V
Channel 1
Output 1
6
++
0.6V
Channel 2
Output 2
5
GND 4
Figure 14. MC34161 Representative Block Diagram
Mode Select
Pin 7
GND
Vref
VCC (>2.0 V)
Input 1
Pin 2
0
1
0
1
0
1
Output 1
Pin 6
0
1
0
1
1
0
Input 2
Pin 3
0
1
0
1
0
1
Output 2
Pin 5
0
1
1
0
1
0
Comments
Channels 1 & 2: Noninverting
Channel 1: Noninverting
Channel 2: Inverting
Channels 1 & 2: Inverting
Figure 15. Truth Table
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MC33161 pdf, datenblatt
MC34161, MC33161, NCV33161
Input VS
V2
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 ǓV1 + (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
Output
Voltage
Pin 5
GND
VCC
GND
Output
Voltage
Pin 6
VCC
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 ǓV1 + (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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