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Analog Devices - 5-Channel Monolithic Comparator for Lamp Monitoring

Numéro de référence AD22001
Description 5-Channel Monolithic Comparator for Lamp Monitoring
Fabricant Analog Devices 
Logo Analog Devices 





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AD22001 fiche technique
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

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