U2044B

U2044B ATMEL | Alldatasheet

Document overview

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Technical content

Features

• Temperature and Supply Voltage Compensated Flashing Frequency  Frequency Doubling Indicates Lamp Outage  Two Relay Driver Outputs with High Current-carrying Capacity and Low Saturation Voltage  Minimum Lamp Load for Flasher Operation: /g179 1 W  Very Low Susceptibility to EMI  Protection According to ISO/TR7637/1 Level 4  Extremly Low Current Consumption < 10 µA (with Switches Open)  Reverse Polarity Protection  Three Control Inputs: Left, Right and Hazard Warning

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 direc- tion 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 extreme low current consumption the U2044B can be directly connected to the battery. Dual Output Flasher U2044B Rev. 4721A–AUTO–05/03

2 U2044B

Figure 1. Block Diagram

Figure 2. Pinning DIP14/SO14

2 SIL Start input left

3 SIR Start input right

4 SIHW Start input hazard warning

6 CR1 Control input relay 1

7 CR2 Control input relay 2

8 LD Lamp failure detection

10 GND IC ground

11 OR1 Output relay 1

12 VS V

13 OR2 Output relay 2

14 OSC Oscillator

4 U2044B

4721A–AUTO–05/03 Functional Description Oscillator (Pin 1 and 14) Flashing frequency, f1, is determined by the R1C1 components as follows (see Figure 1): where C 1 /g163 47 µF R1 = 6.8 k/g87 to 180 k/g87 In the case of a lamp outage, the oscillator frequency is switched to the lamp outage fre- quency f 2 with f2 /g187 2.2 /g180/g32f1. Duty cycle in normal flashing mode: 50% Duty cycle in lamp outage mode: 40% (bright phase) Start Input Right and Left (Pin 2 and 3) 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. R 6 and R4 are protection resistors for the input stage. With an open flasher switch the current consumption is only I < 10 µA. The IC is kept in stand-by mode until there is a voltage drop of V /g187 6.9 V at the pull-down resistor. Direction mode can only be activated when the ignition switch is in the ON-position as shown in Figure 1. Start Input Hazard Warning (Pin 4) In contrast to the direction switches, the hazard input is a low-side type. The pull-up resistor R10 provides the off-state. R3 is a protection resistor for the input stage. Hazard warning can be activated independent of the ignition switch position. Supply Voltage Sense (Pin 5) This pin supplies the lamp outage comparator at pin 8 and is externally connected to the battery (Kl 30). Control Input Relay 1 and 2 (Pin 6 and 7) The feedback detects the bright phase and the dark phase and enables the oscillator. Lamp Outage Detection (Pin 8) The lamp current is monitored via an external shunt resistor, RShunt and an internal com- parator, K1, with its reference voltage of typically 81 mV (V S = 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): I lamp = 1.75 A Nominal current of 2 lamps: 2 /g180 21 W / (VS = 12 V): I lamp = 3.5 A We recommend setting the detection threshhold in the middle of the current range: Ioutage /g187 2.7 A Thus the shunt resistor is calculated as: R Shunt = VT (K1)/Ioutage RShunt = 81 mV/2.7 A = 30 m/g87 Comparator K1's reference voltage is matched to the characteristics of filament lamps (see section “Control Signal Threshold”).

4721A–AUTO–05/03 The combination of the shunt resistor and the resistance of the wire harness prevents pin 8 from a too high voltage in the case of shorted lamps. Supply Voltage (Pin 9) This pin supplies the oscillator, the comparators and the logic parts of the IC. GND (Pin 10) The integrated circuit is protected against transients according to ISO-TR 7637-3 level 3 via resistor R 2 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 pro- tected against reversed battery. Control Output Relay 1 and 2 (Pin 11 and 13) The relay control outputs are high-side drivers with a low saturation voltage and capable of driving a typical automotive relay with a coil resistance of 60 /g87. Supply Voltage Power (Pin 12) 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 pin 1 Parameters Symbol Value Unit Supply voltage, 1 min, pins 5, 9 and 12 V S 24 V Junction temperature T j 150 /g176C Ambient temperature range T amb -40 to +100 /g176C Storage temperature range T stg -55 to +150 /g176C Thermal Resistance Parameters Symbol Value Unit Junction ambient, DIP14 Junction ambient, SO14 RthJA RthJA 120 K/W K/W

Electrical Characteristics

Typical values under normal operation in application circuit Figure 1, VS (+30) = 12 V. Reference point ground (-31), Tamb = 25/g176C, unless otherwise specified Parameters Test Conditions Symbol Min. Typ. Max. Unit Supply voltage range Pins 5, 9, 12 V S 81 8 V Supply current, switches open Pins 5, 9, 12 I S 10 µA Output current for relay driver Pins 11, 13 I O 300 mA Saturation voltage RL = 82 /g87 VS = 8 V VS = 12 V VO 1.0 1.2 V V Relay output reverse current Pin 11, 13 I O 0.1 mA Relay coil resistance R L 60 /g87 Start delay First bright phase t on 10 ms

6 U2044B

4721A–AUTO–05/03 Control signal threshold VS = 9 V VS = 13.5 V VS = 16 V VS VS VS 70.6 85.0 93.0 mV mV mV Tolerance of control signal threshold VS = 9 V to 16 V, pin 8, Tamb = -140/g176C to 100/g176C -6 +6 % Temperature coefficient of control signal threshold VS = 13.5 V , pin 8 T K 10 µV/K Clamping voltage T amb = -40/g176C to 100/g176C V12 25.0 27.5 30.0 V Relay output overvoltage detection (relay disabled) Tamb = -40/g176C to 100/g176C V12 18 20 22 V Electrical Characteristics (Continued) Typical values under normal operation in application circuit Figure 1, VS (+30) = 12 V. Reference point ground (-31), Tamb = 25/g176C, unless otherwise specified Parameters Test Conditions Symbol Min. Typ. Max. Unit Tolerances Typical values under normal operation in application circuit Figure 1, VS (+30) = 12 V. Reference point ground (-31), Tamb = 25/g176C, unless otherwise specified Parameters Test Conditions Symbol Min. Typ. Max. Unit Frequency determining resistor R 1 6.8 510 k /g87 Frequency determining capacitor C 1 47 µF Frequency tolerance Normal flashing, basic frequency f1 not including the tolerance of the external components R1 and C1 /g68f1 -5 +5 % Bright period Basic frequency f1 /g68f1 47 53 % Control frequency f2 /g68f2 37 45 % Frequency increase Lamp failure f 2 2.15 /g180/g32 2.3 /g180/g32 Hz Lamp load PL 1W

4721A–AUTO–05/03

Package Information

Ordering Information

Extended Type Number Package Remarks U2044B DIP14 – U2044B-FP SO14 – technical drawings according to DIN specifications 4.8 max Dimensions in mm 20.0 max 1.64 1.44 3.30.5 min 0.58 0.48 2.54 15.24 14 8 7.77 7.47 6.4 max 0.36 max 9.8 8.2 technical drawings according to DIN specifications Dimensions in mm 0.25 0.10 8.75 0.4 1.27 7.62 1.4 5.2 4.8 3.7 3.8 6.15 5.85 0.2 14 8

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