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: ≥ 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 Dual Output Flasher 1. 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. U2044B 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. 4721C–AUTO–02/08 Figure 1-1. Block Diagram 30 9 5 30 RShunt V S-81 mV + - C1 4.7 µF 30 mΩ 8 K1 Contact 1 2 + - 14 R1 82 kΩ R9 6 V Ref1 47 kΩ + - 1 R8 7 + + 47 kΩ V S /2 V Ref2 + V S-6V 27.5V 11 13 GND 12 10 3 2 R2 220Ω Relay 1 2 R4 R10 R3 4.7 kΩ Hazard warning 4.7 kΩ 30 4 1.2 kΩ R6 4.7 kΩ right 15 R5 1.2 kΩ R7 left 1.2 kΩ 31 12700 2 U2044B 4721C–AUTO–02/08 U2044B 2. Pin Configuration Figure 2-1. Pinning SO14 OSC 1 14 OSC SIL 2 13 OR2 SIR SIHW 4 VS 5 Table 2-1. 12 VS 3 U2044B 11 OR1 10 GND CR1 6 9 VS CR2 7 8 LD Pin Description Pin Symbol Function 1 OSC Oscillator 2 SIL Start input left 3 SIR Start input right 4 SIHW 5 VS 6 CR1 Control input relay 1 7 CR2 Control input relay 2 8 LD Lamp failure detection 9 VS VS 10 GND IC ground 11 OR1 Output relay 1 12 VS 13 OR2 Output relay 2 14 OSC Oscillator Start input hazard warning VS VS 3 4721C–AUTO–02/08 3. Functional Description 3.1 Oscillator (Pin 1 and 14) Flashing frequency, f1, is determined by the R1C1 components as follows (see Figure 1-1 on page 2): 1 f 1 ≈ ------------------------------------- Hz R 1 × C 1 × 1.5 where C1 ≤ 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: Duty cycle in lamp outage mode: 3.2 50% 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. 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 ignition 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 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. 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. 4 U2044B 4721C–AUTO–02/08 U2044B 3.6 Lamp Outage Detection (Pin 8) The lamp current is monitored via an external shunt resistor, RShunt and an internal comparator, K1, with its reference voltage of typically 81 mV (VS = 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): Nominal current of 2 lamps: 2 × 21W/(VS = 12V): Ilamp = 1.75A Ilamp = 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: RShunt = 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 section “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 R2, 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 driving a typical automotive relay with a coil resistance of 60Ω. 3.10 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. 5 4721C–AUTO–02/08 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 Supply voltage, 1 min, pins 5, 9 and 12 Value Unit VS 24 V °C Tj 150 Ambient temperature range Tamb –40 to +100 °C Storage temperature range Tstg –55 to +150 °C Symbol Value Unit RthJA 120 K/W Junction temperature 5. Thermal Resistance Parameters Junction ambient, SO14 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 Conditions Symbol Min. 8 Typ. Max. Unit Supply voltage range Pins 5, 9, 12 VS 18 V Supply current, switches open Pins 5, 9, 12 IS 10 µA Output current for relay driver Pins 11, 13 IO 300 mA Saturation voltage RL = 82Ω VS = 8V VS = 12V VO 1.0 1.2 V V Relay output reverse current Pin 11, 13 IO 0.1 mA Relay coil resistance RL Ω 60 10 ms Start delay First bright phase ton Control signal threshold VS = 9V VS = 13.5V VS = 16V VS VS VS Tolerance of control signal threshold VS = 9V to 16V, pin 8, Tamb = –140°C to 100°C Temperature coefficient of control signal threshold VS = 13.5V, pin 8 TK Clamping voltage Tamb = –40°C to 100°C V12 25.0 27.5 30.0 V Relay output overvoltage detection (relay disabled) Tamb = –40°C to 100°C V12 18 20 22 V 6 70.6 85.0 93.0 –6 mV mV mV +6 10 % µV/K U2044B 4721C–AUTO–02/08 U2044B 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 Frequency determining resistor Frequency determining capacitor Frequency tolerance Bright period Frequency increase Symbol Min. R1 6.8 Typ. C1 Max. Unit 510 kΩ 47 µF Normal flashing, basic frequency f1 not including the tolerance of the external components R1 and C1 ∆f1 –5 +5 % Basic frequency f1 ∆f1 47 53 % Control frequency f2 ∆f2 37 45 % f2 2.15 × f1 2.3 × f1 Hz PL 1 Lamp failure Lamp load W 8. Ordering Information Extended Type Number Package Remarks U2044B-MFPY SO14 Tubed, Pb-free U2044B-MFPG3Y SO14 Taped and reeled, Pb-free 9. Package Information Package SO14 5.2 4.8 Dimensions in mm 8.75 3.7 1.4 0.25 0.10 0.4 1.27 6.15 5.85 7.62 14 0.2 3.8 8 technical drawings according to DIN specifications 1 7 7 4721C–AUTO–02/08 10. Revision History Please note that the following page numbers referred to in this section refer to the specific revision mentioned, not to this document. 8 Revision No. History 4721C-AUTO-02/08 • • • • • • Put datasheet in the newest template Pb-free logo on page 1 deleted Figure title Figure 2-1 on page 3 renamed Section 5 “Thermal Resistance” on page 6 changed Section 8 “Ordering Information” on page 7 changed Section 9 “Package Information” on page 7 changed 4721B-AUTO-09/05 • • • • Put datasheet in the newest 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 U2044B 4721C–AUTO–02/08 Headquarters International Atmel Corporation 2325 Orchard Parkway San Jose, CA 95131 USA Tel: 1(408) 441-0311 Fax: 1(408) 487-2600 Atmel Asia Room 1219 Chinachem Golden Plaza 77 Mody Road Tsimshatsui East Kowloon Hong Kong Tel: (852) 2721-9778 Fax: (852) 2722-1369 Atmel Europe Le Krebs 8, Rue Jean-Pierre Timbaud BP 309 78054 Saint-Quentin-en-Yvelines Cedex France Tel: (33) 1-30-60-70-00 Fax: (33) 1-30-60-71-11 Atmel Japan 9F, Tonetsu Shinkawa Bldg. 1-24-8 Shinkawa Chuo-ku, Tokyo 104-0033 Japan Tel: (81) 3-3523-3551 Fax: (81) 3-3523-7581 Technical Support [email protected] Sales Contact www.atmel.com/contacts Product Contact Web Site www.atmel.com Literature Requests www.atmel.com/literature Disclaimer: The information in this document is provided in connection with Atmel products. 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