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MC33161 Schematic ( PDF Datasheet ) - Motorola Semiconductors

Teilenummer MC33161
Beschreibung UNIVERSAL VOLTAGE MONITORS
Hersteller Motorola Semiconductors
Logo Motorola Semiconductors Logo 




Gesamt 16 Seiten
MC33161 Datasheet, Funktion
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.
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 Positve 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
Order this document by MC34161/D
MC34161
MC33161
UNIVERSAL VOLTAGE
MONITORS
SEMICONDUCTOR
TECHNICAL DATA
8
1
P SUFFIX
PLASTIC PACKAGE
CASE 626
8
1
D SUFFIX
PLASTIC PACKAGE
CASE 751
(SO–8)
Simplified Block Diagram
(Positive Voltage Window Detector Application)
VCC
8
1 2.54V
Reference
VS 7
2
+
++
2.8V
+–
1.27V
3
+
++
0.6V
+–
1.27V
6
5
4
MOTOROLA ANALOG IC DEVICE DATA
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
Device
MC34161D
MC34161P
Operating
Temperature Range
TA = 0° to +70°C
Package
SO–8
Plastic DIP
MC33161D
MC33161P
TA = –40° to +85°C
SO–8
Plastic DIP
© Motorola, Inc. 1998
Rev 1.1
1






MC33161 Datasheet, Funktion
MC34161 MC33161
FUNCTIONAL DESCRIPTION
Introduction
To be competitive in today’s electronic equipment market,
new circuits must be designed to increase system reliability
with minimal incremental cost. The circuit designer can take a
significant step toward attaining these goals by implementing
economical circuitry that continuously monitors critical circuit
voltages and provides a fault signal in the event of an
out–of–tolerance condition. The MC34161, MC33161 series
are universal voltage monitors intended for use in a wide
variety of voltage sensing applications. The main objectives
of this series was to configure a device that can be used in as
many voltage sensing applications as possible while
minimizing cost. The flexibility objective is achieved by the
utilization of a unique Mode Select input that is used in
conjunction with traditional circuit building blocks. The cost
objective is achieved by processing the device on a standard
Bipolar Analog flow, and by limiting the package to eight pins.
The device consists of two comparator channels each with
hysteresis, a mode select input for channel programming, a
pinned out reference, and two open collector outputs. Each
comparator channel can be configured as either inverting or
noninverting by the Mode Select input. This allows a single
device to perform over, under, and window detection of
positive and negative voltages. A detailed description of each
section of the device is given below with the representative
block diagram shown in Figure 13.
Input Comparators
The input comparators of each channel are identical, each
having an upper threshold voltage of 1.27 V ±2.0% with 25
mV of hysteresis. The hysteresis is provided to enhance
output switching by preventing oscillations as the comparator
thresholds are crossed. The comparators have an input bias
current of 60 nA at their threshold which approximates a
21.2 Mresistor to ground. This high impedance minimizes
loading of the external voltage divider for well defined trip
points. For all positive voltage sensing applications, both
comparator channels are fully functional at a VCC of 2.0 V. In
order to provide enhanced device ruggedness for hostile
industrial environments, additional circuitry was designed
into the inputs to prevent device latch–up as well as to
suppress electrostatic discharges (ESD).
Reference
The 2.54 V reference is pinned out to provide a means for
the input comparators to sense negative voltages, as well as
a means to program the Mode Select input for window
detection applications. The reference is capable of sourcing
in excess of 2.0 mA output current and has built–in short
circuit protection. The output voltage has a guaranteed
tolerance of ±2.4% at room temperature.
The 2.54 V reference is derived by gaining up the internal
1.27 V reference by a factor of two. With a power supply
voltage of 4.0 V, the 2.54 V reference is in full regulation,
allowing the device to accurately sense negative voltages.
Mode Select Circuit
The key feature that allows this device to be flexible is the
Mode Select input. This input allows the user to program
each of the channels for various types of voltage sensing
applications. Figure 14 shows that the Mode Select input has
three defined states. These states determine whether
Channel 1 and/or Channel 2 operate in the inverting or
noninverting mode. The Mode Select thresholds are shown in
Figure 5. The input circuitry forms a tristate switch with
thresholds at 0.63 V and Vref + 0.23 V. The mode select input
current is 10 µA when connected to the reference output, and
42 µA when connected to a VCC of 5.0 V, refer to Figure 6.
Output Stage
The output stage uses a positive feedback base boost
circuit for enhanced sink saturation, while maintaining a
relatively low device standby current. Figure 10 shows that
the sink saturation voltage is about 0.2 V at 8.0 mA over
temperature. By combining the low output saturation
characteristics with low voltage comparator operation, this
device is capable of sensing positive voltages at a VCC of
1.0 V. These characteristics are important in undervoltage
sensing applications where the output must stay in a low
state as VCC approaches ground. Figure 4 shows the Output
Voltage versus Supply Voltage in an undervoltage sensing
application. Note that as VCC drops below the programmed
4.5 V trip point, the output stays in a well defined active low
state until VCC drops below 1.0 V.
APPLICATIONS
The following circuit figures illustrate the flexibility of this
device. Included are voltage sensing applications for over,
under, and window detectors, as well as three unique
configurations. Many of the voltage detection circuits are
shown with the open collector outputs of each channel
connected together driving a light emitting diode (LED). This
‘ORed’ connection is shown for ease of explanation and it is
only required for window detection applications. Note that
many of the voltage detection circuits are shown with a
dashed line output connection. This connection gives the
inverse function of the solid line connection. For example, the
solid line output connection of Figure 15 has the LED ‘ON’
when input voltage VS is above trip voltage V2, for
overvoltage detection. The dashed line output connection
has the LED ‘ON’ when VS is below trip voltage V2, for
undervoltage detection.
6 MOTOROLA ANALOG IC DEVICE DATA

6 Page









MC33161 pdf, datenblatt
MC34161 MC33161
Figure 25. Automatic AC Line Voltage Selector
Input
92 Vac to
276 Vac
T
3.0A
MR506
1N
4742
10k
3W
8
2.54V
1 Reference
10k
100k
7
+
2+
1.27V
1.6M
+
47
+
3+
+
10
1.27V
++
2.8V
++
0.6V
4
+
MAC
228A6FP
220
250V
B+
75k
10k + 220
250V
1.2k
75k
RTN
6
5
The above circuit shows the MC34161 configured as an automatic line voltage selector. The IC controls the triac, enabling the circuit to function
as a fullwave voltage doubler or a fullwave bridge. Channel 1 senses the negative half cycles of the AC line voltage. If the line voltage is less
than150 V, the circuit will switch from bridge mode to voltage doubling mode after a preset time delay. The delay is controlled by the 100 kresistor
and the 10 µF capacitor. If the line voltage is greater than 150 V, the circuit will immediately return to fullwave bridge mode.
12 MOTOROLA ANALOG IC DEVICE DATA

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