Features • • • • • • • • Temperature and Voltage Compensated Frequency Warning Indication of Lamp Failure by Means of Frequency Doubling can be Disabled Voltage Dependence of the Car Indicator Lamps Compensated for Lamp Failure Relay Output with High Current Carrying Capacity and Low Saturation Voltage Minimum Lamp Load for Flasher Operation ≥ 1W Load-dump Protection Very Low Susceptibility to EMI Protection According to ISO/TR 7637/1 Level 4 1. Description The design of the U6433B is similar to that of U6043B, both devices have the same excellent EMC (Electro Magnetic Capability) and protection features. The U6433B includes an additional 8-mV comparator and a logical connection with the frequency doubling stage. This combination can be used for a hazard switch which bypasses the external shunt resistor to disable the frequency doubling. This feature is especially important with respect to the US automotive industry. During direction mode the U6433B works like other flashers, that is, frequency doubling in the case of lamp outage. Flasher, 18-mΩ Shunt, Frequency Doubling Disabling U6433B Rev. 4810B–AUTO–10/05 Figure 1-1. Block Diagram 6 2 G5 + K1 - C1 R1 VS - 49 mV + K4 - 4.7 µF VS D1 23 V VS - 8 mV + K5 - 4 G2 VS - 4 V 82 kΩ G4 K2 5 K3 49 a VS - 8 V VS - 6 V 3 7 8 1 Shunt VS R4 470 Ω R3 18 mΩ R2 PL >1 W 2 1.5 kΩ U6433B 4810B–AUTO–10/05 U6433B 2. Pin Configuration Figure 2-1. Pinning SO8 GND 1 8 SI VS 2 7 LD REL 3 6 VS OSC 4 5 OSC U6433B Table 2-1. Pin Description Pin Symbol Function 1 GND 2 VS 3 REL Relay driver 4 OSC Oscillator 5 OSC 6 VS Supply voltage 7 LD Lamp failure detection 8 SI Start input (49a) IC ground Supply voltage Oscillator 3 4810B–AUTO–10/05 3. Functional Description 3.1 Pin 1, GND 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 Pin 2, Supply Voltage, VS – Power 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 Pin 3, Relay Control Output (Driver) The relay control output is a high-side driver with a low saturation voltage and is capable of driving a typical automotive relay with a minimum coil resistance of 60Ω. 3.4 Pins 4 and 5, Oscillator The 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 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: 50% Duty cycle in lamp outage mode: 40% (bright phase) 3.5 Pin 6, Supply Voltage, Sense For accurate monitoring via the shunt resistor, a minimized layer resistance from point VS/shunt to pin 6 is recommended. 3.6 3.6.1 4 Pin 7, Lamp Outage Detection Control Signal Threshold 1 (49-mV Comparator K1) The detection point for lamp failure can be calculated from the control signal threshold, typically 49 mV with VS = 12V. With a measuring resistance of R3 = 18 mΩ, the frequency change-over is reached at a lamp load of 21W + 11.4W. The variation of the control signal threshold supply voltage takes into account the PTC characteristic of filament lamps. U6433B 4810B–AUTO–10/05 U6433B 3.6.2 Control Signal Threshold 2 (8-mV Comparator K4) A voltage drop between 49 mV to 8 mV at R3 shunt resistor lets the flasher work in frequency doubling mode. If the voltage drop decreases to a value below VR3MAX = 8 mV, frequency doubling is disabled. This can be achieved either with a switch which bypasses the shunt resistor (for example, a special hazard warning switch) or with a small lamp load. The arrangement of the supply connections to pins 2 and 6 must ensure that, on the connection PCB, the layer resistance from VS to pin 6 is lower than the resistance to pin 2. Flasher operation starts with a lamp load of PL ≥ 1W. 3.7 Pin 8, Start Input Start condition for flashing: the voltage at pin 8 has to be below the K3 threshold (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 between the thresholds of comparators K2 and K3. 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 1W is required. 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 Supply voltage, pins 2 and 6 Surge forward current tp = 0.1 ms, pins 2 and 6 tp = 300 ms, pins 2 and 6 tp = 300 ms, pin 8 Output current, pin 3 Power dissipation Tamb = 95°C, SO8 Tamb = 60°C, SO8 Symbol Value Unit VS 18 V 1.5 1.0 30.0 A A mA IO 0.3 A Ptot 340 560 mW mW IFSM Tj 150 °C Ambient temperature range Tamb –40 to +105 °C Storage temperature range Tstg –55 to +150 °C Symbol Value Unit RthJA 160 K/W Junction temperature 5. Thermal Resistance Parameters Junction ambient SO8 5 4810B–AUTO–10/05 6. Electrical Characteristics Typical values under normal operation of the application circuit shown in Figure 1-1 on page 2, VS = 12V (pins 2 and 6). Tamb = 25°C, reference point ground (–31), unless otherwise specified. Parameters Test Conditions Supply voltage range Pins 2 and 6 Symbol Min. VS 9 Typ. Max. Unit 16.5 V 8 mA 11 mA Supply current, dark phase Pins 2 and 6 IS 4.5 Supply current, bright phase Pins 2 and 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 Ω 60 10 ton Frequency determining resistor R1 Frequency determining capacitor C1 6.8 ms 510 kΩ 47 µF Frequency tolerance Normal flashing, basic frequency f1 not including the tolerances of the external components R1 and C1 ∆f1 –5 +5 % Bright period Basic frequency f1, VS = 9V to 15V ∆f1 47 53 % Bright period Control frequency f2, VS = 9V to 15V ∆f2 37 45 % Frequency increase Lamp failure, VS = 9V to 15V f2 2.15 × f1 2.3 × f1 Hz Control signal threshold 1 VS = 15V, pin 7 VS = 9V VS = 12V VR3 50 43 47 57 47 51 mV VR3 2 10 mV 5 kΩ Control signal threshold 2 Leakage resistance Lamp load 6 49a to GND Rp PL 1 53 45 49 W U6433B 4810B–AUTO–10/05 U6433B 7. Ordering Information Extended Type Number Package Remarks U6433B-MFPY SO8 Tubed, Pb-free U6433B-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 0.2 3.8 6.15 5.85 3.81 8 5 technical drawings according to DIN specifications 1 4 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 4810B-AUTO-08/05 • • • • Put datasheet in a new template Updated text to new style guide First page: Pb-free logo added Page 7: Ordering Information changed 7 4810B–AUTO–10/05 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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