U2044B_05 ATMEL | Alldatasheet
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- 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: ≥ 1W Very Low Susceptibility to EMI Protection According to ISO/TR7637/1 Level 4 Extremely Low Current Consumption < 10 µA (with Switches Open) Reverse Polarity Protection Three Control Inputs: Left, Right and Hazard Warning 1. Description The integrated circuit U2044B is used in rel ay-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 extreme low current consumption the U2044B can be directly connected to the battery. Dual Output Flasher U2044B Rev. 4721B–AUTO–09/05
4721B–AUTO–09/05 U2044B Figure 1-1. Block Diagram 27.5 V VRef2 VRef1 VS-81 mV GND 101311 3 2 4 47 k VS /2 47 k RShunt Contact VS-6 V 4.7 µF 82 k 220 Hazard warning 4.7 k 4.7 k R6R4 1.2 k R10 right left 1.2 k 1.2 k Relay 12700 30 m 4.7 k Ω Ω Ω Ω Ω Ω Ω Ω Ω Ω Ω
4721B–AUTO–09/05 U2044B 2. Pin Configuration Figure 2-1. Pinning DIP14/SO14 OSC SIR SIHW OSC OR2 OR1 SIL VS CR1 CR2 GND LD U2044B VS VS Table 2-1. Pin Description Pin Symbol Function
1 OSC Oscillator
2 SIL Start input left
3 SIR Start input right
4 SIHW Start input hazard warning
S
6 CR1 Control input relay 1
7 CR2 Control input relay 2
8 LD Lamp failure detection
S
10 GND IC ground
11 OR1 Output relay 1
12 VS V
S
13 OR2 Output relay 2
14 OSC Oscillator
4721B–AUTO–09/05 U2044B 3. Functional Description
3.1 Oscillator (Pin 1 and 14)
Flashing frequency, f 1, is determined by the R 1C1 components as follows (see Figure 1-1 on page 2): where C 1 ≤ 47 µF R1 = 6.8 kΩ to 180 kΩ 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: 40% (bright phase)
3.2 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. R6 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 ≈ 6.9V at the pull-down resistor. Direction mode can only be activated when the igniti on switch is in the ON-position as shown in Figure 1-1 on page 2.
3.3 Start Input Hazard Warning (Pin 4)
In contrast to the direction switches, the hazard input is a low-side type. The pull-up resistor R 10 provides the off-state. R3 is a protection resistor for the input stage. Hazard warning can be acti- vated independent of the ignition switch position.
3.4 Supply Voltage Sense (Pin 5)
This pin supplies the lamp outage comparator at pin 8 and is externally connected to the battery (Kl 30).
3.5 Control Input Relay 1 and 2 (Pin 6 and 7)
The feedback detects the bright phase and the dark phase and enables the oscillator.
4721B–AUTO–09/05 U2044B
3.6 Lamp Outage Detection (Pin 8)
The lamp current is monitored via an external shunt resistor, R Shunt and an internal comparator, K1, with its reference voltage of typically 81 mV (V S = 12V). The outage of one lamp out of two lamps is detected according to the following calculation: Nominal current of 1 lamp: 21W/(VS = 12V): I lamp = 1.75A Nominal current of 2 lamps: 2 × 21W/(VS = 12V): I lamp = 3.5A We recommend setting the detection threshold in the middle of the current range: Ioutage ≈ 2.7A Thus the shunt resistor is calculated as: R Shunt = VT (K1)/Ioutage RShunt = 81 mV/2.7 A = 30 mΩ Comparator K1’s reference voltage is matched to the characteristics of filament lamps (see sec- tion “Control Signal Threshold”). 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.
3.7 Supply Voltage (Pin 9)
This pin supplies the oscillator, the comparators and the logic parts of the IC.
3.8 GND (Pin 10)
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 R 2, R3, R4, R6, R8 and R9 limits the current pulses in the IC. The IC is also protected against reversed battery.
3.9 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 driv- ing a typical automotive relay with a coil resistance of 60Ω.
3.10 Supply Voltage Power (Pin 12)
This pin supplies the relay drive rs connected directly to the battery (Kl 30). It is internally clamped by a 27-V Z-diode.
4721B–AUTO–09/05 U2044B 4. 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. 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 °C Ambient temperature range T amb –40 to +100 °C Storage temperature range T stg –55 to +150 °C 5. Thermal Resistance Parameters Symbol Value Unit Junction ambient, DIP14 Junction ambient, SO14 R thJA RthJA 120 K/W K/W 6. Electrical Characteristics Typical values under normal operation in application circuit Figure 1-1 on page 2, VS (+30) = 12V. Reference point ground (–31), Tamb = 25°C, unless otherwise specified Parameters Test Condition s 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 = 82Ω VS = 8V VS = 12V 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 Ω Start delay First bright phase t on 10 ms Control signal threshold VS = 9V VS = 13.5V VS = 16V VS VS VS 70.6 85.0 93.0 mV mV mV Tolerance of control signal threshold V S = 9V to 16V, pin 8, Tamb = –140°C to 100°C –6 +6 % Temperature coefficient of control signal threshold VS = 13.5V, pin 8 T K 10 µV/K Clamping voltage T amb = –40°C to 100°C V 12 25.0 27.5 30.0 V Relay output overvoltage detection (relay disabled) Tamb = –40°C to 100°C V 12 18 20 22 V
4721B–AUTO–09/05 U2044B 9. Package Information 7. Tolerances Typical values under normal operation in application circuit Figure 1-1 on page 2, VS (+30) = 12V. Reference point ground (–31), Tamb = 25°C, unless otherwise specified Parameters Test Conditions Symbol Min. Typ. Max. Unit Frequency determining resistor R 1 6.8 510 k Ω Frequency determining capacitor C 1 47 µF Frequency tolerance Normal flashing, basic frequency f1 not including the tolerance of the external components R 1 and C1 ∆f1 –5 +5 % Bright period Basic frequency f1 ∆f1 47 53 % Control frequency f2 ∆f2 37 45 % Frequency increase Lamp failure f 2 2.15 × f1 2.3 × f1 Hz Lamp load PL 1W 8. Ordering Information Extended Type Number Package Remarks U2044B-MY DIP14 Tubed, Pb-free U2044B-MFPY SO14 Tubed, Pb-free U2044B-MFPG3Y SO14 Taped and reeled, Pb-free 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
4721B–AUTO–09/05 U2044B 10. Revision History 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 Please note that the following page numbers referred to in this section refer to the specific revision mentioned, not to this document. Revision No. History 4721B-AUTO-09/05
- Put datasheet in a new template
- Pb-free logo on page 1 added
- New heading rows in Table “Absolute Maximum Rating” on page 6 added
- Ordering Information on page 7 changed
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