TEMIC U2480B

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 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
D
D
D Internal protection measures for pulses
according to ISO TR 7637/1
D ESD according to MIL-SID-883 C test method 3015.7
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
– 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
OSC
Oscillator
VS
GND
13945
Pilot lamp
VStab
TELEFUNKEN Semiconductors
Rev. A1, 22-Oct-97
1 (8)
U2480B
Detailed Block Diagram
16
K1
22 V
15
22 V
+
–
22 V
+
–
10
Voltage drift
of comparator
threshold
Ith = f (VS)
VS
23 V
Stabilized
voltage
Vstab = 5.5 V
13
17
Poweron
reset
Vstab
7V
8
Oscillator
Osc
7V
Divider
Ith
3
2
20
19
21
5
4
27
26
1
28
23
22
24
7
8
9
Clock 1
Tosc x2
Clock 2
Tosc x20
T1
Ref
E1
K2
Forward and return counter
T = 1.2 s
Ref
E1
K3
E2
Ref
E1
Ref
E1
Ref
E1
T2
Start
forward
High at
counter end
Set
Start
return
High at
counter zero
Reset
Out
K4
14
K5
T2
Vout
T1
Reset
Latch for indicator
and stop lamps
Out
Set
K6
+
–
Ref
E1
K7
Ref
E1
+
–
Forward and return counter
T = 1.2 s
E2
K8
Start
forward
High at
counter end
25 V
Start
return
High at
counter zero
+
–
11
12
Latched at
signal ”low”
BL
SP
13910
Figure 1. Block diagram
2 (8)
TELEFUNKEN Semiconductors
Rev. A1, 22-Oct-97
U2480B
Pin Description
REFK6
E1K2
RefK2
E1K4
1
28
27
2
26
3
25
4
E1K6
REFK5
E1K5
NC
Pin
1
Symbol
REFK6
2
3
E1K2
REFK2
4
5
E1K4
REFK4
6
7
E1K8
REFK8
OSC
GND
VS
BL
REFK4
5
24
E2K7
8
9
10
11
E1K8
6
23
REFK7
12
SP
REFK8
7
22
E1K7
OSC
8
21
E2K3
13
14
15
16
Vstab
Vout
E1K1
REFK1
17
18
19
20
E2K1
NC
E1K3
REFK3
9
20
REFK3
VS
10
19
E1K3
21
22
E2K3
E1K7
BL
11
18
NC
23
REFK7
SP
12
17
E2K1
Vstab
13
16
REFK1
24
25
26
27
E2K7
NC
E1K5
REFK5
28
E1K6
GND
Vout
14
15
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
E1K1
13373
Figure 2. Pin configuration
TELEFUNKEN Semiconductors
Rev. A1, 22-Oct-97
3 (8)
U2480B
Functional Description
Comparators
The voltage threshold of all internal comparators has a
typical value of Vth = 10 mV.
w
A voltage drop accross the shunt of Vsh Vth means no
fault in the lamp circuit and the output is disabled.
v
In the event of a voltage drop Vsh Vth, 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
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.
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.
v
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.
w
v
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.
w 0.7 V
S at the input BL does not cause
Fuse Monitoring
A voltage of VBL
a fault signal.
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.
The turn indicator and the brake light memory is
maintained by VS (terminal 15)
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.
If 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.
w
A periodic fault signal (period of less than 1 s) is indicated
only if the mark-to-space ratio is 10/1, whereby the
w
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
4 (8)
Symbol
VS, VBatt
IS
ISC
Iout
Tamb
Value
16.5
1.1
170
–12
–40 to +100
Unit
V
A
mA
mA
°C
TELEFUNKEN Semiconductors
Rev. A1, 22-Oct-97
U2480B
Parameters
Storage temperature range
Junction temperature
Symbol
Tstg
Tj
Value
–55 to +125
150
Unit
°C
°C
Symbol
RthJA
Value
75
Unit
K/W
Thermal Resistance
Parameters
Thermal resistance
SDIP 28
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
VBatt = 12 V, Vout = low
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
VBatt = 12 V
VBatt = 15 V
Symbol
Min.
IS
VS
3.5
IK2
IK4
IK8
IK11,IK12
IK31,IK32
IK71,IK72
IK5
IK6
IO6
IO2
IO4
IO8
IO1
IO3
IO7
IO5
Vthx
Vthx
VminRef
5.0
6.3
Typ.
Max.
Unit
6
5.2
mA
V
25
mA
–10
mA
10.0
11.4
15.0
16.5
0.33 VS
mV
mV
V
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,
TELEFUNKEN Semiconductors
Rev. A1, 22-Oct-97
I14
Vsat
–10.0
VZ1
VZ2,
VZBL
VZ3
22
23
25
7
V
V
V
V
fosc
1.67
kHz
1.5
mA
V
5 (8)
U2480B
Parameters
Delay time
Test Conditions / Pins
Symbol
Min.
Typ.
Max.
Unit
td
1.1
1.2
1.3
s
tdb
115
125
135
ms
0.15 VS
V
0.6 VS
V
Debounce time
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
0.2 VS
VBL
IBL
0.7 VS
V
mA
–3.0
Pin SP
VSP
VSP
ISP
ISP
0.35 VS
0.45 VS
–6.0
300
V
V
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
8.7
8.5
0.35
0.25
0.53
0.43
23.114
1
6 (8)
12.2
11.0
1.778
technical drawings
according to DIN
specifications
13044
TELEFUNKEN Semiconductors
Rev. A1, 22-Oct-97
U2480B
2 kΩ
2 kΩ
1
28
2
27
*)
2 kΩ
VBatt
*)
Dipped headlight
(2x 55 W)
2 kΩ
3
26
4
25 NC
5
24
2 kΩ
*)
2 kΩ
1 kΩ
6
2 kΩ
*)
22
U2480B
2 kΩ
8
21
9
20
10
19
Cosc
1 kΩ
Failure without storage
2 kΩ
Failure with storage
*)
*)
*)
NC
BL
18
11
Indicator control
SP
VBatt
23
7
Kl 31
Stop light
(3x 21 W)
*)
2 kΩ
2 kΩ
12
17
13
16
14
15
Open: Store ”on”
Rosc
*)
1 kΩ
VBatt
*)
2 kΩ
Charge control
Park light
additional
park light
(6x 4 W)
*)
Marker
light
2 kΩ
2 kΩ
2 kΩ
1
28
2
27
2 kΩ
Reversing light
(2x 21 W)
*)
VBatt
*)
*)
VBatt
2 kΩ
1 kΩ
2 kΩ
3
26
4
25 NC
5
24
*)
2 kΩ
2 kΩ
2 kΩ
Fog tail lamp
*)
VBatt
2 kΩ
6
23
7
22
2 kΩ
2 kΩ
U2480B
Headlight
additional
headlight
(2x 55 W)
Fog lamp
(2x 55 W)
*)
VBatt
*)
2 kΩ
8
21
9
20
10
19
*)
2 kΩ
*)
License
plate and
side lamps
(4x 4 W)
NC
VBatt
11
18
12
17
13
16
14
15
2 kΩ
High:
Store ”off”
1 kΩ
2 kΩ
*)
VBatt
*)
*) Shunt
13911
TELEFUNKEN Semiconductors
Rev. A1, 22-Oct-97
7 (8)
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
8 (8)
TELEFUNKEN Semiconductors
Rev. A1, 22-Oct-97