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Automotive Lamp Outage Monitor
U2480B
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 inter-
connected, 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
account
D Input voltage range up to 23 V independent of supply
D 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
GND
Output
stage
Oscillator
Pilot lamp
VStab
OSC
VS
13945
TELEFUNKEN Semiconductors
Rev. A1, 22-Oct-97
1 (8)

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U2480B
Detailed Block Diagram
16
22 V
15
22 V
17
22 V
3
Ref
2 K2
E1
20
Ref
19
E1 K3
21
E2
5
Ref
4 K4
E1
27
Ref
26 K5
E1
1
Ref
28 K6
E1
23
Ref
22
E1 K7
24
E2
7
Ref
8 K8
E1
9
K1
+
+
Ith
Voltage drift
of comparator
threshold
Ith = f (VS)
Power-
on
reset
Forward and return counter
T = 1.2 s
Start High at
forward counter end
Start
return
High at
counter zero
Stabilized
voltage
Vstab= 5.5 V
Oscillator
Divider
Clock 1 Clock 2
Tosc x2 Tosc x20
T1 T2
Set Out
Reset
23 V
7V
7V
T2 T1
Reset
Latch for indicator
and stop lamps
Set Out
+
Forward and return counter
T = 1.2 s
Start High at
forward counter end
Start
return
High at
counter zero
+
25 V
+
Latched at
signal ”low”
Figure 1. Block diagram
10
VS
13
Vstab
8
Osc
14
Vout
11
BL
12
SP
13910
2 (8) TELEFUNKEN Semiconductors
Rev. A1, 22-Oct-97

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Pin Description
REFK6 1
28 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
BL 11
19 E1K3
18 NC
SP 12
17 E2K1
Vstab 13
16 REFK1
Vout 14
15 E1K1
13373
Figure 2. Pin configuration
U2480B
Pin Symbol
Function
1 REFK6 Reference for threshold voltage
single comparator K6
2 E1K2 Input 1; single comparator K2
3 REFK2 Reference for threshold voltage;
double comparator K5
4 E1K4 Input 1; single comparator K4
5 REFK4 Reference for threshold voltage;
double comparator K4
6 E1K8 Input 1; single comparator K8
7 REFK8 Reference for threshold voltage;
triple comparator K8
8 OSC Oscillator input
9 GND Ground
10 VS Supply voltage
11 BL Input window comparator for
direction indicator
12 SP Programming pin for memory
function
13 Vstab Stabilized voltage
14 Vout Output for tell-tale lamp
15 E1K1 Input 1; double comparator K1
16 REFK1 Reference for threshold voltage;
double comparator K1
17 E2K1 Input 2; double comparator K1
18 NC Not connected
19 E1K3 Input 1; double comparator K3
20 REFK3 Reference for threshold voltage
double comparator 3
21 E2K3 Input 2; double comparator K2
22 E1K7 Reference for threshold voltage;
double comparator K7
23 REFK7 Reference for threshold voltage
double comparator 7
24 E2K7 Input 2; double comparator K7
25 NC Not connected
26 E1K5 Input 1; single comparator K5
27 REFK5 Reference for threshold voltage
single comparator 5
28 E1K6 Input 1; single comparator K6
TELEFUNKEN Semiconductors
Rev. A1, 22-Oct-97
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U2480B
Functional Description
Comparators
The voltage threshold of all internal comparators has a
typical value of Vth = 10 mV.
wA voltage drop accross the shunt of Vsh Vth means no
fault in the lamp circuit and the output is disabled.
vIn the event of a voltage drop Vsh Vth, the output sup-
plies the current IO, and the pilot lamp is activated by the
external transistor.
vThe output is reliably disabled for a voltage at the refer-
ence pin of the comparators of VminRef 1/3 VS
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.
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).
Time Delay
"A fault is indicated only if it is present for td = 1.2 0.2 s.
wIf an OK pulse 100 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.
wA periodic fault signal (period of less than 1 s) is indicated
only if the mark-to-space ratio is 10/1, whereby the
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.
Storage
A failure in the break light circuit which is present for
longer than td is stored.
vA 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.
w vA 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.
wA voltage of VBL 0.7 VS at the input BL does not cause
a fault signal.
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.
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
4 (8) TELEFUNKEN Semiconductors
Rev. A1, 22-Oct-97

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U2480B
Parameters
Storage temperature range
Junction temperature
Thermal Resistance
Thermal resistance
Parameters
SDIP 28
Symbol
Tstg
Tj
Symbol
RthJA
Value
–55 to +125
150
Value
75
Unit
°C
°C
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
Comparator output current
Comparator thresholds
Vthx = VREFKx – VExKx
x = Pin–No.
Minimum comparator input
voltage
Output Vout
Output current
Output saturation voltage
Protection
Voltage of Zener diodes
Oscillator
Oscillator frequency
Test Conditions / Pins Symbol
VBatt = 12 V, Vout = low
IS
VS
VBatt = 12 V
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
IK2
IK4
IK8
IK11,IK12
IK31,IK32
IK71,IK72
IK5
IK6
IO6
IO2
IO4
IO8
IO1
IO3
IO7
IO5
VBatt = 12 V
VBatt = 15 V
Vthx
Vthx
VminRef
VS = 12 V
Vsat = VS – Vout
Iout = –10 mA
Pin 14
I14
Vsat
all REFKx and ExKx. pins
Pin VS
Pin BL
Pin Vstab and OSC
WRosc = 82 k ,
Pin 8
Cosc = 10 nF,
VZ1
VZ2,
VZBL
VZ3
fosc
Min.
3.5
5.0
6.3
Typ.
25
–10
10.0
11.4
0.33 VS
–10.0
22
23
25
7
1.67
Max.
6
5.2
15.0
16.5
1.5
Unit
mA
V
mA
mA
mV
mV
V
mA
V
V
V
V
V
kHz
TELEFUNKEN Semiconductors
Rev. A1, 22-Oct-97
5 (8)