Features • • • • Temperature and Voltage Compensated Frequency Warning Indication of Lamp Failure by Means of Frequency Doubling Minimum Lamp Load for Flasher Operation ≥ 10W Relay Output with High Current Carrying Capacity and Low Saturation Voltage • Low Susceptibility to EMI Flasher, 30 mΩ Shunt, Pilot Lamp to GND or VBatt 1. Description The integrated circuit U2043B is used in relay-controlled automotive flashers where a high EMC level is required. A lamp outage is indicated by frequency doubling during hazard mode as well as direction mode. The pilot lamp can be connected either to VBatt or GND. Figure 1-1. U2043B Block Diagram +VS + 49 6 2 R3 Shunt C1 Measuring comparator 4 K 1 V 6-81 mV 30 m Ω 7 Pilot lamp 3 Pulse generator R1 Relay 3.8 k Ω 8 5 5W 49 a 3.3 k Ω K 3 V 6-5 V 49 a-Comparator R2 23 V 1 IC Ground R1 100 Ω GND - 31 5 W 21 W 21 W 21 W Indicator lamps Pilot lamps 21 W 5 W Rev. 4720B–AUTO–09/05 2. Pin Configuration Figure 2-1. Pinning DIP8/SO8 GND 1 8 SI VS 2 7 LD REL 3 6 VS OSC 4 5 OSC U2043B Table 2-1. 2 Pin Description Pin Symbol Function 1 GND IC ground 2 VS 3 REL Supply voltage VS Relay driver 4 OSC C1 Oscillator 5 OSC R1 Oscillator 6 VS Supply voltage VS 7 LD Lamp failure detection 8 SI Start input (49a) U2043B 4720B–AUTO–09/05 U2043B 3. Functional Description 3.1 GND (Pin 1) The integrated circuit is protected against damage via resistor R4 to ground (–31) in the case of battery reversal. An integrated protection circuit together with external resistances R2 and R4 limits the current pulses in the IC. 3.2 Supply Voltage, VS Power (Pin 2) The arrangement of the supply connections to pin 2 must be so as to ensure that, on the connection printed circuit board (PCB), the resistance of VS to pin 6 is lower than that to pin 2. 3.3 Relay Control Output (Driver, Pin 3) The relay control output is a high-side driver with a low saturation voltage and capable of driving a typical automotive relay with a minimum coil resistance of 60Ω. 3.4 Oscillator (Pin 4 and 5) Flashing frequency, f1, is determined by the R1C1 components as follows (see Figure 1-1 on page 1): 1 f 1 = ------------------------------------- Hz R 1 × C 1 × 1.5 where C1 ≤ 47 µF R1 = 6.8 kΩ to 510 kΩ In the case of a lamp outage (see pin 7) 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: 3.5 50% 40% (bright phase) Supply Voltage, Sense (Pin 6) For accurate monitoring via the shunt resistor, a minimized layer resistance from point VS/shunt to pin 6 is recommended. 3 4720B–AUTO–09/05 3.6 Lamp Outage Detection (Pin 7) The lamp current is monitored via an external shunt resistor R3 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): Ilamp = 1.75A Nominal current of 2 lamps: 2 × 21W/(VS = 12V): 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: R3 = VT (K1)/Ioutage R3 = 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 7 from a too high voltage in the case of shorted lamps. 3.7 Start Input (Pin 8) Start condition for flashing: The voltage at pin 8 has to be less than VS – 5V (flasher switch closed). Humidity and dirt may decrease the resistance between 49a and GND. If this leakage resistance is > 5 kΩ the IC is still kept in its off-condition. In this case the voltage at pin 8 is greater than VS – 5V. During the bright phase the voltage at pin 8 is above the K2 threshold, during the dark phase it is below the K3 threshold. For proper start conditions a minimum lamp wattage of 10W is required. 4 U2043B 4720B–AUTO–09/05 U2043B 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 VS 16.5 V Surge forward current tp = 0.1 ms tp = 2 ms tp = 2 ms IFSM IFSM IFSM 1.5 1.0 50 A A mA Output current, pin 3 IO 0.3 A Tamb = 95°C, DIP8 SO8 Ptot Ptot 420 340 mW mW Tamb = 60°C, DIP8 SO8 Ptot Ptot 690 560 mW mW Tj 150 °C Ambient temperature range Tamb –40 to +95 °C Storage temperature range Tstg –55 to +150 °C Symbol Value Unit RthJA RthJA 110 160 K/W K/W Supply voltage, pins 2 and pin 6 Power Dissipation Junction temperature 5. Thermal Resistance Parameters Junction ambient, DIP8 Junction ambient, SO8 5 4720B–AUTO–09/05 6. Electrical Characteristics Typical values under normal operation in application circuit Figure 1-1 on page 1, VS (+49, pin 2 and pin 6) = 12V. Reference point ground (–31), Tamb = 25°C, unless otherwise specified Parameters Test Conditions Symbol Min. Typ. Supply voltage range Pins 2, 6 VS(+49) 9 to 15 Max. Unit 8 mA 11 mA V Supply current Dark phase or stand-by, pins 2, 6 IS 4.5 Supply current Bright phase, pins 2, 6 IS 7.0 Relay output Saturation voltage IO = 150 mA, VS = 9V (pin 3) VO 1.0 V Relay output reverse current Pin 3 IO 0.1 mA Relay coil resistance Start delay RL First bright phase ton Frequency determining resistor R1 Frequency determining capacitor C1 Frequency tolerance Bright period 6.8 ms kΩ 47 µF ∆f1 –5 +5 % Basic frequency f1 ∆f1 47 53 % Control frequency f2 ∆f2 37 45 % Lamp outage f2 2.15 × f1 Control signal threshold VS = 15V (pin 7) VS = 9V VS = 12V VR3 VR3 VR3 85 66 76 Leakage resistance 49a to GND Rp 6 10 510 Normal flashing, basic frequency f1 not including the tolerance of the external components R1 and C1 Frequency increase Lamp load Ω 60 PL 10 2.3 × f1 Hz 91 71 81 97 76 87 mV mV mV 2 5 kΩ W U2043B 4720B–AUTO–09/05 U2043B 7. Ordering Information Extended Type Number Package U2043B-MY Remarks DIP8 Tubed, Pb-free U2043B-MFPY SO8 Tubed, Pb-free U2043B-MFPG3Y SO8 Taped and reeled, Pb-free 8. Package Information Package SO8 Dimensions in mm 5.2 4.8 5.00 4.85 3.7 1.4 0.25 0.10 0.4 1.27 6.15 5.85 3.81 8 0.2 3.8 5 technical drawings according to DIN specifications 1 4 7 4720B–AUTO–09/05 Package: DIP8 Dimensions in mm 9.8 max. 7.62±0.15 9.6±0.1 0.3 B A 2.5 3.6±0.1 4.2±0.3 6.7 1.8 1.2±0.3 0.53±0.05 2.54 nom. 0.4 A 6.3±0.1 0.36 max. 3 x 2.54 = 7.62 nom. B 8.75±0.8 1.54 0.65 8 5 technical drawings according to DIN specifications 1 4 Drawing-No.: 6.543-5040.01-4 Issue: 1; 16.01.02 8 U2043B 4720B–AUTO–09/05 U2043B 9. Revision History 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 4720B-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 5 added Ordering Information on page 7 changed 9 4720B–AUTO–09/05 Atmel Corporation 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 487-2600 Regional Headquarters Europe Atmel Sarl Route des Arsenaux 41 Case Postale 80 CH-1705 Fribourg Switzerland Tel: (41) 26-426-5555 Fax: (41) 26-426-5500 Asia Room 1219 Chinachem Golden Plaza 77 Mody Road Tsimshatsui East Kowloon Hong Kong Tel: (852) 2721-9778 Fax: (852) 2722-1369 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 Atmel Operations Memory 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 436-4314 RF/Automotive Theresienstrasse 2 Postfach 3535 74025 Heilbronn, Germany Tel: (49) 71-31-67-0 Fax: (49) 71-31-67-2340 Microcontrollers 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 436-4314 La Chantrerie BP 70602 44306 Nantes Cedex 3, France Tel: (33) 2-40-18-18-18 Fax: (33) 2-40-18-19-60 ASIC/ASSP/Smart Cards 1150 East Cheyenne Mtn. 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