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Analog Devices Semiconductor Electronic Components Datasheet

AD22001 Datasheet

5-Channel Monolithic Comparator for Lamp Monitoring

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AD22001 pdf
a
5-Channel Monolithic Comparator
for Lamp Monitoring
FEATURES
Continuous Status Checks of Five Bulbs
Lamp Status Check in “ON” and “OFF” States
Status Checks of Two In-Line Fuses
Very Low Voltage Drop at Sensor Shunt Resistor
(Comparator Threshold 1.75 mV at 22؇C)
Temperature and Supply Voltage Compensated
Powered Directly from Car Battery: Protection
Included for Transient, Reverse Supply, Load Dump
Operating Temperature Range: –40؇C to +125؇C
15 V CMOS Compatible Digital Output Signals
Voltage Limited Power Supply Output for 15 V CMOS
Logic ICs
GENERAL DESCRIPTION
The AD22001 is a monolithic, five-channel comparator circuit
for monitoring the functionality of lamps in automotive
applications.
The IC tests the series circuit leading to the lamp to determine
if the circuit is intact and a functional lamp is in the socket. The
AD22001 continuously checks the functionality of up to five
bulbs in either their “on” or “off” state, and also tests for the
presence of an in-line fuse in two of the series circuits.
Digital outputs indicate the status of each channel. Additionally,
the AD22001 provides a voltage limited power supply output to
supply 15 V CMOS circuits that may interface to the AD22001.
AD22001*
FUNCTIONAL BLOCK DIAGRAM
+VS 2
CHIP 1
ENABLE
GND 20
–IN1 4
+IN1 5
INFUSE1 & 2 6
–IN2 9
+IN2 8
–IN3 11
+IN3 10
–IN4 14
+IN4 15
–IN5 16
+IN5 17
INFUSE5 19
SWITCH &
LIMITER
AD22001
CHANNEL 1
3
POWER
OUT
7 OUT 1 & 2
CHANNEL 2
CHANNEL 3
13
12
OUT 3 & 4
OUT (3 × 4)
CHANNEL 4
CHANNEL 5
18
OUT 5
+V BATT
FUSE
SWITCH
COPPER
SHUNT
RESISTOR
OUTPUT
LAMP
SIGNAL CONDITIONING
AND SIGNAL PROCESSING
Figure 1. Typical Application Circuit for a Single Channel Lamp Monitor
REV. A
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703



Analog Devices Semiconductor Electronic Components Datasheet

AD22001 Datasheet

5-Channel Monolithic Comparator for Lamp Monitoring

No Preview Available !

AD22001 pdf
AD22001–SPECIFICATIONS (TA = +22؇C, VS = +13.5 V unless otherwise noted)
Parameter
Test Conditions Min
Typ Max Units
DIFFERENTIAL INPUTS (Voltage Drop from Shunt Resistor: Pins 4 & 5, 8 & 9, 10 & 11, 14 & 15, 16 & 17)
VINDIFF
VINCM
Comparator Threshold Voltage1
Common-Mode Threshold Voltage1
Power Supply Sensitivity of VINDIFF2
Temperature Compensation of VINDIFF3
9 V VS 16 V
1.5
5
1.75
50
3770
IINB Input Bias Current
IINC Constant Current Source4
10
30 60
SINGLE-ENDED INPUTS (Fuse Monitoring: Pins 6, 19)
VINF Fuse Input Threshold Voltage5
CHIP ENABLE CONTROL INPUT (Pin 1)
VINCE
VINCD
Chip Enable, Input High
Chip Disable (Stop Operation)6
9
OUTPUTS (Pins 7, 12, 13, 18)
VOUTL
Output Voltage, Low
Indicates No Fault in Lamp Circuit
VOUTH
Output Voltage, High
Indicates Fault in Lamp Circuit
Load = 500 µA
9 V VS VSSDH
Load = 50 µA
VOUTPS–2.5
2.0 mV
V
%
ppm/°C
µA
µA
4V
V
6V
0.6 V
VOUTPS V
POWER SUPPLY (Pin 2: +VS, Pin 20: GND)
VS Supply Voltage
IS Quiescent Supply Current
VOUTH: No Load
POWER SUPPLY OUTPUT (Pin 3)
VOUTPS
Power Supply Output Voltage
IOUTPS
Max Output Voltage
Power Supply Output Current7
OPERATING SHUTDOWN (Safety Features)
VSSDH
Operation Shutdown at High
Power Supply Voltages8
VSSDL
Operation Shutdown at Low
Power Supply Voltage9
Pin 1 High
Pin 1 Low
9
1
10 V < VS < 14.5 V VS–0.5
IOUTPS 1 mA
2
30
7
3
100
VS–0.3
16
33
30 V
5 mA
µA
VS V
18 V
mA
36 V
9V
TEMPERATURE RANGE
TA Operating Temperature Range
PACKAGE
Plastic DIP (N-20)
–40 +125 °C
AD22001N
NOTES
1In the presence of a common-mode voltage greater than 5 V, if the shunt voltage applied to the comparator does not exceed the threshold (i.e., the bulb is switched
on but does not draw current), then the device will indicate a failure.
2At VS = 13.5 V, the differential input threshold voltage is typically 1.75 mV. With an increase of V S, the threshold voltage, VINDIFF, will change as well.
Power supply sensitivity of 50% means that when the power supply voltage V S increases by 10%, the threshold voltage VINDIFF will be increased by half of this per-
centage value: 5%.
3This is the temperature coefficient to compensate for any temperature influence on the external copper PCB track shunt resistors. 3770 ppm/ °C is equal to 6.6 µV/°C.
4This current source is used to test the lamp when it is switched off (cold lamp test).
5If the voltage at the input from the fuse (Pin 6 or 19) does not exceed the threshold voltage, then the output will indicate a failure.
6When the Chip Enable is open-circuited, the chip is disabled.
7Shorting VOUTPS to ground will cause the device to stop operating for that period. However, the device will not suffer any damage.
8At this voltage, or above, the internal power supply and the power output V OUTPS will be shut off.
9Below the minimum voltage, the circuit will shut down. Above the maximum, the circuit will be on if enabled.
All min and max specifications are guaranteed, although only those marked in boldface are tested on all production units at final test.
Specifications subject to change without notice.
–2– REV. A



Analog Devices Semiconductor Electronic Components Datasheet

AD22001 Datasheet

5-Channel Monolithic Comparator for Lamp Monitoring

No Preview Available !

AD22001 pdf
AD22001
ABSOLUTE MAXIMUM RATINGS*
Forward Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . +36 V
Reversed Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . –34 V
Forward Transient (40 ms) . . . . . . . . . . . . . . . . . . . . . . +60 V
Reverse Transient (40 ms) . . . . . . . . . . . . . . . . . . . . . . . –40 V
Voltage on Any Input Pin Relative to GND . . . –34 V to +36 V
Power Dissipation (VS = 13.5 V) . . . . . . . . . . . . . . . . 300 mW
Operating Temperature (Ambient) . . . . . . . –40°C to +125°C
Storage Temperature . . . . . . . . . . . . . . . . . . –65°C to +150°C
*Stresses above those listed under “Absolute Maximum Ratings” may cause
permanent damage to the device. This is a stress rating only, the functional
operation of the device at these or any other conditions above those indicated in the
operational sections of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
ORDERING INFORMATION
Model
Temperature Package
Range
Option*
AD22001N –40°C to +125°C N-20
*N = Plastic DIP Package.
CONNECTION DIAGRAM
CE 1
+VS
POWER OUT
2
3
–IN 1 4
+IN 1 5
FUSE 1 + 2 6
AD22001N
TOP VIEW
(Not to Scale)
OUT 1 + 2 7
+IN 2 8
–IN 2 9
+IN 3 10
20 GND
19 FUSE 5
18 OUT 5
17 +IN 5
16 –IN 5
15 +IN 4
14 –IN 4
13 OUT 3 + 4
12 OUT (3 × 4)
11 –IN 3
PRODUCT DESCRIPTION
The AD22001’s five comparators each monitor the voltage
across a current sensing shunt resistor which is part of a lamp
circuit. Each comparator has a small threshold voltage, nomi-
nally 1.75 mV. The output of the comparator will change state
as the voltage developed across the shunt (by the lamp current)
crosses the threshold level. Because the threshold voltage is very
small, copper tracks on the PC board can be used as shunt resis-
tors with low power dissipation.
CAR
BATTERY
+VS
CE VINCE
FUSE
IN FUSE
VINF
SWITCH
–IN IINB
COPPER
SHUNT
VINDIFF
+IN
LIGHT
BULB
IINB
SWITCH &
VOLTAGE LIMITER
INTERNAL
POWER SUPPLY
POWER
SUPPLY
OUTPUT
1
2
IINC
SIGNAL
OUT
GND
NOTES
1. TEMPERATURE COMPENSATION FOR COPPER SHUNT RESISTOR
AND SUPPLY VOLTAGE COMPENSATION.
2. CURRENT SOURCE FOR COLD BULB CHECKING
(AVAILABLE IN CHANNELS 1, 2, 3 AND 4).
Figure 2. Typical Block Diagram of One Channel and
Power Supply Control
The AD22001 has internal linear signal processing that compen-
sates the comparator threshold voltage as the resistance of the
copper shunt resistor changes with varying temperature. The
comparator thresholds are also adjusted to compensate for
changes in lamp current due to power supply variations.
The AD22001 was designed for a common automotive lamp
monitoring application. The connection diagram (Figure 3) and
the application suggestion (Figure 4) show the different combi-
nations of functions that are performed for each channel.
FUNCTIONAL DESCRIPTION
The AD22001 consists of fine sensitive comparators with
built-in offset plus biasing and support for comprehensive lamp
circuit monitoring. The comparators are arrayed as a single and
two groups of two (as shown in Figure 3) arranged to meet a
variety of requirements. Two or more AD22001s can be
combined. The comparators are basically similar with additional
features according to their place in the array.
Hot Lamp Test
Each comparator has a differential input with built-in threshold
of 1.75 mV, under nominal operating conditions. The compara-
tors are intended to monitor the voltage developed across a low
resistance shunt by a lamp current. The comparators are active
whenever they are connected to the battery circuit. They indi-
cate normal or okay (the series circuit to the lamp is intact)
when the threshold voltage of 1.75 mV is exceeded. This occurs
when the +input is driven negative with respect to the –input by
a voltage greater than the threshold. They also indicate normal
if they are not activated by common-mode battery voltage,
whether the threshold voltage is exceeded or not. They indicate
a fault if the common-mode is applied but the threshold is not
exceeded.
REV. A
–3–




Part Number AD22001
Description 5-Channel Monolithic Comparator for Lamp Monitoring
Maker Analog Devices
Total Page 8 Pages
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