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U2480B
Automotive Lamp Outage Monitor
Description
The IC U2480B is designed for individual monitoring of 11 lamps in automobiles. Three double comparators and five single comparators, which can be optionally interconnected, permit realization of many monitoring variants. An integrated latch is available to memorize the outage of indicator or brake lamps.
Features
D 10 mV comparator thresholds D Temperature compensated D Voltage characteristic of the lamps is taken into D D
account Input voltage range up to 23 V independent of supply Typical input currents 25 mA, so that protective resistors can be connected in series
D Internal protection measures for pulses
according to ISO TR 7637/1
D ESD according to MIL-SID-883 C test method 3015.7
- Human body model: 4 kV - Machine model: 200 V EMI protection (TEM cell up to 100 V/m)
Ordering Information
Extended Type Number U2480B Package SDIP28 Remarks
Block Diagram
VBatt
3 double comparators
5 single comparators
Stabili- zation
VStab
Logic / Timing
Latch
Output stage
Oscillator
OSC VS
GND
Pilot lamp VStab
13945
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U2480B
Detailed Block Diagram
16 22 V 15 22 V 17 22 V + - Poweron reset Ith Oscillator 7V Divider Clock 1 Tosc x2 T1 Ref E1 Ref E1 E2 Ref E1 Ref E1 K3 K2 Forward and return counter T = 1.2 s Start forward Start return K4 14 K5 T2 T1 Reset Latch for indicator and stop lamps Out Set + - Vout High at counter end High at counter zero Set Out Clock 2 Tosc x20 T2 + - K1 Voltage drift of comparator threshold Ith = f (VS) 10 23 V Stabilized voltage Vstab = 5.5 V 13 7V 8 Osc Vstab VS
3 2 20 19 21 5 4 27 26
Reset
1 28 23 22 24 7 8
Ref E1 Ref E1 E2 Ref E1
K6
K7 Forward and return counter T = 1.2 s K8 Start forward Start return High at counter end High at counter zero
+ - 25 V
11
BL
12 Latched at signal "low" + -
SP
9
13910
Figure 1. Block diagram
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U2480B
Pin Description
REFK6 1 28 E1K6 Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Vout 14
13373
Symbol REFK6 E1K2 REFK2 E1K4 REFK4 E1K8 REFK8 OSC GND VS BL SP Vstab Vout E1K1 REFK1 E2K1 NC E1K3 REFK3 E2K3 E1K7 REFK7 E2K7 NC E1K5 REFK5 E1K6
E1K2
2
27
REFK5
RefK2
3
26
E1K5
E1K4
4
25
NC
REFK4
5
24
E2K7
E1K8
6
23
REFK7
REFK8
7
22
E1K7
OSC
8
21
E2K3
GND
9
20
REFK3
VS
10
19
E1K3
BL
11
18
NC
SP
12
17
E2K1
Vstab
13
16
REFK1
Function Reference for threshold voltage single comparator K6 Input 1; single comparator K2 Reference for threshold voltage; double comparator K5 Input 1; single comparator K4 Reference for threshold voltage; double comparator K4 Input 1; single comparator K8 Reference for threshold voltage; triple comparator K8 Oscillator input Ground Supply voltage Input window comparator for direction indicator Programming pin for memory function Stabilized voltage Output for tell-tale lamp Input 1; double comparator K1 Reference for threshold voltage; double comparator K1 Input 2; double comparator K1 Not connected Input 1; double comparator K3 Reference for threshold voltage double comparator 3 Input 2; double comparator K2 Reference for threshold voltage; double comparator K7 Reference for threshold voltage double comparator 7 Input 2; double comparator K7 Not connected Input 1; single comparator K5 Reference for threshold voltage single comparator 5 Input 1; single comparator K6
15
E1K1
Figure 2. Pin configuration
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U2480B
Functional Description
Comparators
The voltage threshold of all internal comparators has a typical value of Vth = 10 mV. A voltage drop accross the shunt of Vsh th means no fault in the lamp circuit and the output is disabled. In the event of a voltage drop Vsh th, the output supplies the current IO, and the pilot lamp is activated by the external transistor. The output is reliably disabled for a voltage at the reference pin of the comparators of VminRef 1/3 VS pulse time corresponds to an item of fault information. The time delay until the fault is indicated exceeds the time td = 1.2 s in this case.
wV
Storage
A failure in the break light circuit which is present for longer than td is stored. A voltage of VBL 0.15 VS which is present at the input BL for longer than td leads to fault indication with storage. This allows the possibility of additional flashing monitoring. A voltage of VBL 0.2 VS and of VBL 0.65 VS which is present at the input BL for longer than td leads to fault indication without storage. It is thus possible to extend the scope of monitoring beyond 11 lamps by means of additional comparators ICs. A voltage of VBL a fault signal.
vV
v
v
The typical values of the input currents are 25 mA and are equally large at the switch-over instant, thus making it possible to connect protective resistors in series. The internal threshold is independent of the value of the protective resistor as long as all resistors of a comparator have the same value.
w
v
Fuse Monitoring
It is possible to monitor the fuses of the lamp circuits by means of an EXCLUSIVE OR function between K1 and K3 and between K5 and K6. If the Ref pin of K1 (orK5) is low and the Ref pin of K2 (or K6) is simultaneously high, or vice versa, a fault is indicated. Simultaneous failure of both fuses is not detected. A fuse is faulty if the input voltage at the pin Ref falls below the voltage VminRef (1/3 VS).
w 0.7 V
S at the input BL does not cause
The turn indicator and the brake light memory is maintained by VS (terminal 15)
Power-on Reset
When VBatt (terminal 15) is applied to Pin VS, a brief signal is produced which generates the power-on reset. As a result, the turn indicator, the brake light memory and the counters are reset.
Outputs
A fault signal at the comparators K1 to K8 or at the comparator Pin BL enables the output so that current IO can flow. The output blocking voltage (VS - Vout) is typically 1 V.
Time Delay
A fault is indicated only if it is present for td = 1.2"0.2 s. If an OK pulsew100 ms occurs during this time, time counting is reset to "0". An OK pulse is generated if the comparators K1 to K8 and the input BL do not signal a fault. A periodic fault signal (period of less than 1 s) is indicated only if the mark-to-space ratio isw10/1, whereby the
Threshold Testing without Time Delay td
To connect the input comparators directly to the output pin, a voltage of 6 V at Pin OSC is necessary (omit ROSC and COSC).
Absolute Maximum Ratings
Parameters Supply voltage Pulse current (2 ms) Short circuit current (reversed battery) Output current Ambient temperature range Symbol VS, VBatt IS ISC Iout Tamb Value 16.5 1.1 170 -12 -40 to +100 Unit V A mA mA C
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U2480B
Parameters Storage temperature range Junction temperature Symbol Tstg Tj Value -55 to +125 150 Unit C C
Thermal Resistance
Parameters Thermal resistance SDIP 28 Symbol RthJA Value 75 Unit K/W
Electrical Characteristics
VBatt (Kl. 15) = 10 to 15 V, Tamb = -40 to +95_C, supply series resistors and input protection resistors connected (see figure 1 "Block diagram" and figure 3 "Basic application schematic") unless otherwise specified. Parameters Supply Supply current Power on reset (POR) Comparators Comparator input current during switch over Test Conditions / Pins VBatt = 12 V, Vout = low Symbol IS VS IK2 IK4 IK8 IK11,IK12 IK31,IK32 IK71,IK72 IK5 IK6 IO6 IO2 IO4 IO8 IO1 IO3 IO7 IO5 Vthx Vthx VminRef Pin 14 VS = 12 V Vsat = VS - Vout Iout = -10 mA all REFKx and ExKx. pins Pin VS Pin BL Pin Vstab and OSC Pin 8 Rosc = 82 kW, Cosc = 10 nF, I14 Vsat -10.0 1.5 mA V 5.0 6.3 Min. Typ. Max. 6 5.2 Unit mA V
3.5
VBatt = 12 V
Comparator output current
VBatt = 12 V
Pin 2 Pin 4 Pin 6 Pins 15, 16 Pins 19, 21 Pins 22, 24 Pin 26 Pin 28 Pin 1 Pin 3 Pin 5 Pin 7 Pin 15 Pin 20 Pin 23 Pin 27
25
mA
-10
mA
Comparator thresholds Vthx = VREFKx - VExKx
x = Pin-No.
VBatt = 12 V VBatt = 15 V
10.0 11.4
0.33 VS
15.0 16.5
Minimum comparator input voltage Output Vout Output current Output saturation voltage Protection Voltage of Zener diodes
mV mV V
VZ1 VZ2, VZBL VZ3
22 23 25 7
V V V V
Oscillator Oscillator frequency
fosc
1.67
kHz 5 (8)
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U2480B
Parameters Delay time Debounce time tdb Flashing frequency recognition Fault indication with storage Fault indication without storage No fault indication Input current VBL = low Programming pin Latch ON Latch OFF Input current VSP = 0 V Input current VSP = 12 V Pin BL VBL VBL VBL IBL Pin SP VSP VSP ISP ISP
0.35 VS 0.45 VS -6.0 0.2 VS 0.7 VS 0.15 VS 0.6 VS
Test Conditions / Pins
Symbol td
Min. 1.1 115
Typ. 1.2 125
Max. 1.3 135
Unit s ms V V V
-3.0
mA
V V
300
mA mA
Package Information
Package SDIP28
Dimensions in mm
27.5 27.1 10.26 10.06 4.8 4.2 0.9 3.3 0.53 0.43 23.114 1.778 0.35 0.25 12.2 11.0 8.7 8.5
1
technical drawings according to DIN specifications 13044
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U2480B
2 k 2 k
1 28
*)
2 k
2 27
VBatt *) Dipped headlight (2x 55 W) 2 k
2 k
3 26
4
25 NC
2 k
5 24
*) Stop light (3x 21 W) *) *) VBatt
1 k
6 23
2 k
7 22
U2480B
8 21
2 k 1 k *) *) *) Park light additional park light (6x 4 W) VBatt
Cosc Kl 31 Failure without storage Failure with storage BL Indicator control SP Open: Store "on" Rosc
9 20
2 k
10 19 NC 11 18
2 k
12 17
2 k *) *) *)
1 k
13 16
2 k Charge control
14 15
Marker light
2 k
2 k 2 k
1 28
*)
Reversing light (2x 21 W) VBatt
2 k
2 27
2 k 2 k
3 26
VBatt *) Headlight additional headlight (2x 55 W)
*) *)
1 k 2 k
4 25 NC
2 k
5 24
Fog lamp (2x 55 W) *) *) VBatt
2 k Fog tail lamp VBatt *) 2 k
7 22 6 23
2 k 2 k
U2480B
8 21 9 20
2 k *) *)
2 k
10 19 NC 11 18
VBatt High: Store "off"
2 k
12 17
License plate and side lamps (4x 4 W) *) *)
1 k
13 16
VBatt
2 k
14 15
13911
*) Shunt
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U2480B
Ozone Depleting Substances Policy Statement
It is the policy of TEMIC TELEFUNKEN microelectronic GmbH to 1. Meet all present and future national and international statutory requirements. 2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems with respect to their impact on the health and safety of our employees and the public, as well as their impact on the environment. It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as ozone depleting substances ( ODSs). The Montreal Protocol ( 1987) and its London Amendments ( 1990) intend to severely restrict the use of ODSs and forbid their use within the next ten years. Various national and international initiatives are pressing for an earlier ban on these substances. TEMIC TELEFUNKEN microelectronic GmbH semiconductor division has been able to use its policy of continuous improvements to eliminate the use of ODSs listed in the following documents. 1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively 2 . Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental Protection Agency ( EPA) in the USA 3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C ( transitional substances ) respectively. TEMIC can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain such substances.
We reserve the right to make changes to improve technical design and may do so without further notice. Parameters can vary in different applications. All operating parameters must be validated for each customer application by the customer. Should the buyer use TEMIC products for any unintended or unauthorized application, the buyer shall indemnify TEMIC against all claims, costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death associated with such unintended or unauthorized use. TEMIC TELEFUNKEN microelectronic GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany Telephone: 49 ( 0 ) 7131 67 2831, Fax number: 49 ( 0 ) 7131 67 2423
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TELEFUNKEN Semiconductors Rev. A1, 22-Oct-97

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