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TEMIC
TEMIC


U2480B

Automotive Lamp Outage Monitor



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U2480B pdf
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 pdf
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



Part Number U2480B
Description Automotive Lamp Outage Monitor
Maker TEMIC - TEMIC
Total Page 8 Pages
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