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U2044B
Dual Output Flasher
Description
The integrated circuit U2044B is used in relay-controlled automotive flashers. With two output stages, each side of the vehicle is controlled separately. A left and a right direction indicator input with only a small control current makes switch contacts for small loads possible. The separate hazard warning input simplifies the construction of the hazard switch. Lamp outage is indicated by frequency doubling during direction mode. Thanks to the extreme low current consumption the U2044B can be connected to the battery directly.
Features
D Temperature and supply voltage flashing frequency compensated D Very low susceptibility to EMI D Protection according to ISO/TR7637/1 level 4 D Extremly low current consumption < 10 mA (@switches open) D Reverse polarity protection D Three control inputs: left, right and hazard warning D Frequency doubling indicates lamp outage D Two relay driver outputs with high current-carrying capacity and low saturation voltage D Minimum lamp load for flasher operation: w1 W
Ordering Information
Extended Type Number U2044B U2044B-FP Package DIP14 SO14 Remarks
Pin Description
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Symbol OSC SIL SIR SIHW VS CR1 CR2 LD VS GND OR1 VS OR2 OSC Oscillator Start input left Start input right Start input hazard warning VS Control input relay 1 Control input relay 2 Lamp failure detection VS IC ground Output relay 1 VS Output relay 2 Oscillator
Figure 1. Pinning CR1 CR2 6 7 9 8 VS LD
12750
Function
OSC SIL SIR SIHW VS
1 2 3 4 5
14 OSC 13 OR2 12 Vs
U2044B
11 OR1 10 GND
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U2044B
Block Diagram
9 5 + - K1 Contact 1 14 R1 82 kW 1 + - VRef1 + - + - - + VS-6 V 27.5 V 11 13 GND 10 R2 220 W 3 2 4 R3 4.7 kW R6 4.7 kW R10 1.2 kW - + 12 30 VRef2 VS /2 6 R9 47 kW 7 R8 47 kW 2 VS-81 mV RShunt 30 mW 30 30
C1 4.7 mF
8
Hazard warning R4 4.7 kW
Relay 1 2
right
15
R5 1.2 kW
R7 1.2 kW
left 31
12700
Figure 2. Application circuit R2 for protection against continous reversed polarity: 1 Watt
Functional Description
Pin 1 and Pin 14, Oscillator Flashing frequency, f1, is determined by the R1C1 components as follows (see figure 2): f1 [ where R1 1 C1 1.5 Hz Pin 2 and Pin 3, Start input right and left Flashing is disabled as long as the input comparator is tied to GND (pull-down resistor R7 or R5). The high-side flasher switch "left" or "right" changes the comparator status and enables the output stage at Pin 11 or Pin 13. R6 and R4 are protection resistors for the input stage. With an open flasher switch the current consumption is only I t 10 mA. The IC is kept in stand-by mode until there is a voltage drop of V [ 6.9 V at the pull-down resistor. Direction mode can only be activated when the ignition switch is in ON-position as shown in figure 2.
C1 47 mF R1 + 6.8 kW to 180 kW
In the case of a lamp outage, the oscillator frequency is switched to the lamp outage frequency f2 with f2 [ 2.2 f1 . Duty cycle in normal flashing mode: 50% Duty cycle in lamp outage mode (bright phase): 40%
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U2044B
Pin 4, Start input hazard warnig In contrast to the direction switches, the hazard input is a low-side type. The pull-up resistor R10 provides the offstate. R3 is a protection resistor for the input stage. Hazard warning can be activated independent of the ignition switch position. Pin 5, Supply voltage sense This pin supplies the lamp outage comparator at Pin 8 and is externally connected to the battery (Kl 30). Pin 6 and 7, Control input relay 1 and 2 The feedback detects the bright phase and the dark phase and enables the oscillator. Pin 8, Lamp outage detection The lamp current is monitored via an external shunt resistor, RShunt and an internal comparator K1 with its reference voltage of typ. 81 mV (VS = 12 V). The outage of one lamp out of two lamps is detected according to the following calculation: Nominal current of 1 lamp: 21 W / (VS = 12 V): Ilamp = 1.75 A Nominal current of 2 lamps: 2 x 21 W / (VS = 12 V): Ilamp = 3.5 A. The detection threshold is recommended to be set in the middle of the current range: Ioutage [ 2.7 A Thus the shunt resistor is calculated as: RShunt = VT (K1) / Ioutage RShunt = 81 mV/2.7 A = 30 mW. Comparator K1`s reference voltage is matched to the characteristics of filament lamps (see "control signal threshold" in the data part). The combination of shunt resistor and resistance of wire harness prevents Pin 8 from a too high voltage in the case of shorted lamps. Pin 9, Supply voltage This pin supplies the oscillator, the comparators and the logic parts of the IC. Pin 10, GND The integrated circuit is protected against transients according to ISO-TR 7637-3 level 3 via resistor R2 to ground (-31). An integrated protection circuit together with external resistors R2, R3, R4, R6, R8 and R9 limits the current pulses in the IC. The IC is also protected against reversed battery. Pin 11 and 13, Control output relay 1 and 2 The relay control outputs are high-side driver with a low saturation voltage and capable to drive a typical automotive relay with a coil resistance of 60 W. Pin 12, Supply voltage power This pin supplies the relay drivers connected directly to the battery (Kl 30). It is internally clamped by a 27-V Z-diode.
Absolute Maximum Ratings
Reference point ground (terminal 31), with external circuitry. Parameters Supply voltage, 1 min Junction temperature Storage temperature range Ambient temperature range Pins 5, 9, 12 Symbol VS Tj Tstg Tamb Value 24 150 -55 to +150 -40 to +100 Unit V C C C
Thermal Resistance
Parameters Junction ambient DIP14 SO14 Symbol RthJA RthJA Value 90 120 Unit K/W K/W
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U2044B
Electrical Characteristics
Typical values under normal operation in application circuit figure 1, VS (+30) = 12 V. Reference point ground (-31), Tamb = 25C, unless otherwise specified. Parameters Supply voltage range Supply current, switches open Output current for relay driver Saturation voltage RL = 82 W VS = 8 V VS = 12 V Test Conditions / Pins Pins 5, 9, 12 Pins 5, 9, 12 Pins 11, 13 Pins 11, 13 VO RL Pins 11, 13 IO tON VS = 9 V VS = 13.5 V VS = 16 V Pin 8 VS 70.6 85.0 93.0 -6 TK V12 V12 25.0 18 10 27.5 20 30.0 22 +6 60 0.1 10 1.0 1.2 V V W mA ms mV mV mV % mV/K V V Symbol VS IS IO Min. 8 Typ. Max. 18 10 300 Unit V mA mA
Relay coil resistance Relay output, reverse current Start delay (first bright phase) Control signal threshold
Tolerance of control signal threshold Temperature coefficient of control signal threshold Clamping voltage Relay output overvoltage detection (relay disabled)
VS = 9 to 16 V, Pin 8 Tamb = -40 to +100C VS = 13.5 V Pin 8
Tamb = -40 to +100C Tamb = -40 to +100C
Tolerances
tVS = 9 to 18 V, Tamb = -40 to +100C Parameters Frequency determining resistor Frequency determining capacitor Frequency tolerance (normal flashing basic frequency f1 not including the tolerance of the external components R1 and C1) Bright period (basic frequency f1) Bright period (control frequency f2) Frequency increase (lamp failure) Lamp load Test Conditions / Pins Symbol R1 C1 Df1 -5 Min. 6.8 Typ. Max. 510 47 +5 Unit kW mF %
DF1 Df2 f2 PL
47 37
2.15 f1 2.3
53 45
f1
% % Hz W
1
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U2044B
Package Information
Package DIP14
Dimensions in mm
20.0 max 7.77 7.47
4.8 max 6.4 max 0.5 min 3.3 1.64 1.44 0.58 0.48 15.24 14 8 0.36 max 9.8 8.2
2.54
technical drawings according to DIN specifications 13020
1
7
Package SO14
Dimensions in mm
5.2 4.8 8.75 3.7
1.4 0.4 1.27 7.62 14 8 0.25 0.10 0.2 3.8 6.15 5.85
technical drawings according to DIN specifications 13035
14
8
Rev. A4, 03-Apr-01
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U2044B
Ozone Depleting Substances Policy Statement
It is the policy of Atmel Germany 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. Atmel Germany GmbH 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. Atmel Germany GmbH 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 Atmel Wireless & Microcontrollers products for any unintended or unauthorized application, the buyer shall indemnify Atmel Wireless & Microcontrollers 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. Data sheets can also be retrieved from the Internet: http://www.atmel-wm.com
Atmel Germany GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany Telephone: 49 (0)7131 67 2594, Fax number: 49 (0)7131 67 2423
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Rev. A4, 03-Apr-01

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