AD22001 AD | Alldatasheet
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SWITCH & LIMITER CHANNEL 1 CHANNEL 2 CHANNEL 3 10 13 CHANNEL 4 CHANNEL 5 CHIP ENABLE GND +IN1 –IN1 –IN2 +IN2 –IN3 +IN3 –IN4 +IN4 –IN5 +IN5 POWER OUT OUT 1 & 2 OUT 3 & 4 OUT (3 × 4) OUT 5 AD22001 INFUSE 1 & 2 INFUSE 5 +VS 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. a 5-Channel Monolithic Comparator for Lamp Monitoring AD22001* Tel: 617/329-4700 Fax: 617/326-8703
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 8C) Temperature and Supply Voltage Compensated Powered Directly from Car Battery: Protection Included for Transient, Reverse Supply, Load Dump Operating Temperature Range: –40 8C to +125 8C
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. FUSE +V BATT SWITCH COPPER SHUNT RESISTOR LAMP SIGNAL CONDITIONING AND SIGNAL PROCESSING OUTPUT Figure 1. Typical Application Circuit for a Single Channel Lamp Monitor
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 Comparator Threshold Voltage 1 1.5 1.75 2.0 mV VINCM Common-Mode Threshold Voltage 1 5 V Power Supply Sensitivity of V INDIFF 2 9 V ≤ VS ≤ 16 V 50 % Temperature Compensation of V INDIFF 3 3770 ppm/ °C IINB Input Bias Current 10 µA IINC Constant Current Source 4 30 60 µA SINGLE-ENDED INPUTS (Fuse Monitoring: Pins 6, 19) VINF Fuse Input Threshold Voltage 5 4 V CHIP ENABLE CONTROL INPUT (Pin 1) VINCE Chip Enable, Input High 9 V VINCD Chip Disable (Stop Operation) 6 6 V OUTPUTS (Pins 7, 12, 13, 18) VOUTL Output Voltage, Low Load = 500 µA 0.6 V Indicates No Fault in Lamp Circuit VOUTH Output Voltage, High 9 V ≤ VS ≤ VSSDH VOUTPS–2.5 V OUTPS V Indicates Fault in Lamp Circuit Load = 50 µA POWER SUPPLY (Pin 2: +V S, Pin 20: GND) VS Supply Voltage 93 0 V IS Quiescent Supply Current Pin 1 High 1 3 5 mA VOUTH: No Load Pin 1 Low 100 µA POWER SUPPLY OUTPUT (Pin 3) VOUTPS Power Supply Output Voltage 10 V < V S < 14.5 V VS–0.5 VS–0.3 VS V IOUTPS ≤ 1 mA Max Output Voltage 16 18 V IOUTPS Power Supply Output Current 7 2m A OPERATING SHUTDOWN (Safety Features) VSSDH Operation Shutdown at High 30 33 36 V Power Supply Voltages 8 VSSDL Operation Shutdown at Low 79 V Power Supply Voltage 9 TEMPERATURE RANGE TA Operating Temperature Range –40 +125 °C PACKAGE Plastic DIP (N-20) 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, V INDIFF, will change as well. Power supply sensitivity of 50% means that when the power supply voltage V S increases by 10%, the threshold voltage V INDIFF 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 V OUTPS 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. REV. A–2– AD22001–SPECIFICATIONS(TA = +228C, VS = +13.5 V unless otherwise noted)
REV. A –3– SWITCH & VOLTAGE LIMITER INTERNAL POWER SUPPLY POWER SUPPLY OUTPUT SIGNAL OUT GND 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). +VS VINCE VINF IINB VINDIFF IINB INFUSE IINC Figure 2. Typical Block Diagram of One Channel and changes in lamp current due to power supply variations. nations of functions that are performed for each channel. features according to their place in the array. maximum rating conditions for extended periods may affect device reliability.
ORDERING INFORMATION
Model Range Option* AD22001N –40 °C to +125°C N-20 *N = Plastic DIP Package. CONNECTION DIAGRAM 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 +VS 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.
(registered as a one or high). functions as a test of both fuses. are switched on (whether the lamp circuit draws current or not). a one or high level otherwise.
5 Brake Light I, III
I Hot Lamp Test: Lamp is functional. Test performed while lamp is switched on. II Cold Lamp Test: Lamp is functional. Test performed while lamp is switched off. III Fuse is in place and functional. neously. This can be used as an implicit fuse test. Figure 3. AD22001 Connection Diagram normally connects between the fuse and brake-light switch. lamp circuit is powered, but the circuit fails to draw current.
value shunts made using normal copper tracks on PC cards. Figure 4. Application Suggestion AD22001 will be inactive and Power Out will go low. for the duration of the overvoltage. temperature sensitive threshold in the AD22001. a given value R by noting R = ρSL/W, so that L = RW/ ρS. convenient allowing a 2 °C gradient from the resistor to the IC. currents which are allowed by the fuse which supplies the track. manufacturer, or the MIL table. nominally draws 325 mA, and is on a circuit fused for 10A.
Figure 8. Current-Carrying Capacities and Sizes of Etched Copper Conductors for Various Temperature Rises Above
REV. A–8– OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 20-Pin Plastic DIP (N) Package 11 0 1.060 (26.92) 0.925 (23.50) 0.280 (7.11) 0.240 (6.10) PIN 1 SEATING PLANE 0.022 (0.558) 0.014 (0.356) 0.210 (5.33) MAX 0.150 (3.81) MIN 0.070 (1.77) 0.045 (1.15) 0.100 (2.54) BSC 0.200 (5.05) 0.125 (3.1) 0.015 (0.38) MIN 0.325 (8.25) 0.300 (7.62) 0.015 (0.381) 0.008 (0.203) 15° C1533–21–4/91PRINTED IN U.S.A.