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U2482B Datasheet Preview

U2482B Datasheet

(U2481B / U2482B) Automotive Lamp Outage Monitor

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TELEFUNKEN Semiconductors
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Automotive Lamp Outage Monitor
U2481B/ U2482B
Description
The U2481B and the U2482B multicomparator circuits
are designed to monitor automotive illumination by
sensing the voltage drop across shunt resistors. Provided
with extremely low comparator thresholds, these ICs can
be used together as a chip set to build an entire lamp
monitor system. Single operation of both circuits is also
possible.
As a special feature for brake lamp monitoring, the
U2481B contains a latch stage connected to one of its
triple comparators.
With
– 4 single comparators
– 1 double comparator and
– 2 triple comparators
each of the integrated circuits monitors up to 12 lamps
and up to 6 fuses.
All comparator stages are combined together to control
the common output stage.
Features
D Extremely low comparator thresholds of typically
3.5 mV
D Internal compensation for copper shunts
D Internal compensation for voltage-dependent
bulb characteristic
D Comparator input voltage may exceed supply voltage
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)
Benefits
D Extremely low threshold voltage gives low voltage
drop via shunt resistor. Power dissipation of the lamp
monitor module is minimized
D Perfect EMC in conjunction with an appropriate
pc board layout
Applications
Both ICs can be used in any kind of vehicle with a 12 V
supply. It is sufficient to insert small resistors into the
lamp wiring and to provide the dashboard instrument
cluster with a pilot lamp. These ICs increase the safety
and add comfort features.
Rev. A1: 21.08.1995
Preliminary Information
1 (11)



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U2482B Datasheet Preview

U2482B Datasheet

(U2481B / U2482B) Automotive Lamp Outage Monitor

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U2482B pdf
U2481B/ U2482B
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Block Diagram
28 Ref
REFK1
27
IN1K1
E1
K1 13 mV
+
IT
IT
REFK2
IN1K2
1
2
Ref K2 13 mV
E1
TELEFUNKEN Semiconductors
VB
20
VB
Voltage drift
of comparator
threshold
IT = f (VB)
Power
on
Reset
VS Stabilized
voltage
Vstab = 5.2 V
POR
IT
Divider
Oscillator
Clock 1 Clock 2
2-TOsc 20-TOsc
Cl1 Cl2
19
VS
15 OSC
REFK3
IN1K3
IN2K3
IN3K3
7
6
8
9
26
INFK3
REFK4
IN1K4
24
25
INFK5 16
REFK5
IN1K5
IN2K5
INF
4
3
5
VB
23
Ref K3 3.5 mV
E1
E2
E3
Ref K4 3.5 mV
E1
Ref K5 3.5 mV
E1
E2
+
REFK7
IN1K7
IN2K7
IN3K7
11
10
12
13
Ref K7 3.5 mV
E1
E2
E3
Up down counter
Cl2 T = 1.2 s
Start High at
Set
VS
forward counter end
Out
Start High at
return counter zero
Reset
Cl1
14
OUT
Out Reset
Latch for
stoplamps
Set
POR
K6 Ref
3.5 mV E1
17
INFK6
22
REFK6
21
IN1K6
Up down counter
Cl2 T = 1.2 s
Start High at
forward counter end
Start High at
return counter zero
Cl1
VS
* Connection to
GND only for
U2482B (latch
disabled
18
*
GND
94 8833
Figure 1.
2 (11)
Preliminary Information
Rev. A1: 21.08.1995


Part Number U2482B
Description (U2481B / U2482B) Automotive Lamp Outage Monitor
Maker Temic
Total Page 11 Pages
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U2482B pdf




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