Features
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Lamp Outage Indication for Car and Trailer
Temperature and Supply Voltage Compensated Flashing Frequency
Relay Driver Output with High Current Carrying Capacity and Low Saturation Voltage
Minimum Lamp Load for Flasher Operation > 10W
1. Description
The bipolar integrated circuit ATA2069 is designed for the use in relay-operated auto-
motive flasher modules and makes it possible to detect the outage of flasher bulbs on
the vehicle itself and also on a trailer.
Vehicles with a trailer hook are equipped with additional pilot lamps in the dashboard.
ATA2069 is off (i.e., the relay is deactivated) as long as the flasher switch (at contact
+49a) is open. As soon as this switch is closed, the IC starts reliably with the bright
phase.
There are two thresholds integrated: one threshold is defined to be 21 + 10W and is
designed for the lamp outage detection of 1 of 2 lamps. If the current is below this
threshold, the IC switches to frequency doubling, just like the standard flashers (e.g.
U2043B).
The other threshold is defined to be 42 + 10W and is designed for the outage detec-
tion of 1 of 3 lamps; if this happens, the additional trailer pilot lamp is switched off, but
there is no frequency doubling. 50 ms after the start of the bright phase, the compara-
tor measures the voltage drop at the shunt and latches this value for the rest of the
bright phase. The output of this pilot lamp (pin 8) is short-circuit protected against
GND. In case of a short circuit the external transistor is switched off after 52 ms for the
rest of the current flasher cycle, but it is enabled again for the next cycle.
Flasher with
Trailer Control
ATA2069
4917C–AUTO–10/07
3. Absolute Maximum Ratings
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating
only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this
specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Parameters
Supply voltage
Junction temperature
Ambient temperature range
Storage temperature range
Thermal resistance junction
ambient DIP8
Thermal resistance junction
ambient SO8
Pin
2
Symbol
V
S
T
J
T
amb
T
stg
R
thjc
R
thjc
Value
16.5
150
–40 to +95
–55 to +150
110
160
Unit
V
°C
°C
°C
K/W
K/W
4. Electrical Characteristics
Parameters
Supply voltage range
Relay output current
Relay saturation voltage
Relay leakage current
Values for T = 25°C
Start delay
Delay time for output OPL
Switch off delay time output OPL
in case of short circuit
Voltage threshold for short circuit
detection at output OPL
Output current at OPL
Saturation voltage at OPL
Control signal threshold K1 for
outage detection without trailer
operation
Control signal threshold K4 for
outage detection with trailer
operation
Frequency tolerance
Bright period
Bright period
Frequency increase
Leakage increase
Lamp load
Basic frequency
Frequency doubling
Lamp outage
49a to GND
V
S
= 9V
V
S
= 13V
V
S
= 15V
V
S
= 9V
V
S
= 13V
V
S
= 15V
OPL
OPL
OPL
OPL
OPL
t
on
t
Del
t
Del
V
th
I
O
V
SATO
Vk1
47.5
54.2
58
96
109
115
–5
47
37
2.15
×
f
50
57
61
98
111
118
45
1.5
36
10
10
55
2.4
44
25
300
52.2
59.9
64.1
100
113
120
+5
53
45
2.3
×
f
5
10
ms
ms
ms
% of Us
mA
mV
mV
mV
mV
mV
mV
mV
%
%
%
Hz
kΩ
W
I = 130 mA
I = 250 mA
Test Conditions
Pin
2
3
3
3
Symbol
V
S
(+49a)
I
Rel
V
Rel
I
Relr
Min.
Typ.
9 to 15
300
1
1.5
100
Max.
Unit
V
mA
V
V
µA
Vk4
Delta f1
Delta f1
Delta f2
f2
RI
PL
4
ATA2069
4917C–AUTO–10/07
Embedded System
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