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AD22001 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer AD22001
Beschreibung 5-Channel Monolithic Comparator for Lamp Monitoring
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 8 Seiten
AD22001 Datasheet, Funktion
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






AD22001 Datasheet, Funktion
AD22001
resistance track. Bends in the track make the effective L/W more
difficult to calculate, however, certain common cases have been
evaluated.
To calculate the resistance of a track of width W with a 180°
bend at radius W/2 resulting in a spacing W, add a resistance
equivalent to 2.96 squares to account for the bend. Solving the
resistance equation for L/W,
L/W = R/ρS = 10.769 m/0.25 m/sq,
or L/W = 43 squares.
Subtracting out the bend, the remainder is 40.04 squares.
Converting this to linear dimensions gives 4.004" at W = 0.1".
Assuming equal linear sections, the contacts and the bends
should be made at spacings of 3.412"/4 = 0.853", as shown in
Figure 6.
FROM SWITCH
0.853"
0.1" 0.05"
0.1"
0.1"
AD22001
(Not to Scale)
4
5
2.002"
0.1"
0.1" 0.05"
0.1"
AD22001
(Not to Scale)
4
5
TO LAMP
2.002"
Figure 5. PCB Track Shunt Resistor with One 180° Bend
As shown in Figure 5, the contacts are made to the resistor
section of the track at 2.002" from the bend. The bend has a
uniform width of W, which is 0.1" in this case, and a radius of
W/2. As a result, the aspect ratio of the straight sections plus the
bend total 2.96 squares + (2.002" + 2.002")/0.1" or 43 squares.
The straight sections need not be of equal length, so long as
They have the proper total, and the shorter one is longer than
about 3W. A shorter resistor can be made by using more bends
and reducing the linear portion. For example, with three bends
the total length of four linear sections would be:
(43 squares – 3 ϫ 2.96 squares/Bend)W
or (43 – 8.88) ϫ 0.1"= 3.412".
TO LAMP
0.853"
Figure 6. PCB Track Shunt Resistor with Two 180° Bends
A 90° bend with an inside radius of W/2 and a smooth width of
W adds 0.341 squares to the aspect ratio as shown in Figure 7.
Note that the linear measurements are differently made at the
90° and the 180° bend.
Other styles of bend can be used with minor variation in total
resistance, however, we do not recommend the use of sharp
inside corners on high current conductors in general and shunt
resistors in particular. Sharp inside corners result in very high
local current density and poor resistance repeatability.
L1
W
W
W
2
L2
Figure 7. PCB Track Shunt Resistor with 90° Bend
–6– REV. A

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