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AD22001 Datenblatt(PDF) 3 Page - Analog Devices

Teilenummer AD22001
Bauteilbeschribung  5-Channel Monolithic Comparator for Lamp Monitoring
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Hersteller  AD [Analog Devices]
Direct Link  http://www.analog.com
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AD22001
REV. A
–3–
SWITCH &
VOLTAGE LIMITER
INTERNAL
POWER SUPPLY
POWER
SUPPLY
OUTPUT
SIGNAL
OUT
GND
2
1
CAR
BATTERY
FUSE
SWITCH
COPPER
SHUNT
LIGHT
BULB
CE
–IN
+IN
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).
+V
S
V
INCE
V
INF
I
INB
V
INDIFF
I
INB
IN
FUSE
I
INC
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.
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
Temperature
Package
Model
Range
Option*
AD22001N –40
°C to +125°C N-20
*N = Plastic DIP Package.
CONNECTION DIAGRAM
1
2
3
4
5
6
7
8
9
10
11
20
19
18
17
16
15
14
12
13
TOP VIEW
(Not to Scale)
AD22001N
CE
–IN 1
+IN 1
FUSE 1 + 2
OUT 1 + 2
+IN 2
–IN 2
+IN 3
GND
FUSE 5
OUT 5
+IN 5
–IN 5
+IN 4
–IN 4
OUT 3 + 4
OUT (3
× 4)
–IN 3
POWER OUT
+V
S
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.


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