Features • Temperature and Voltage Compensated Frequency • Warning Indication of Lamp Failure by Means of Frequency Doubling only in Direction • • • • • • • Mode Voltage Dependence of the Car Indicator Lamps also Compensated for Lamp Failure Relay Output with High Current-carrying Capacity and Low Saturation Voltage Load-dump Protection Minimum Lamp Load for Flasher Operation ≥ 1W Low Susceptibility to EMI Extremely Low Standby Current of 10 µA Protection According to ISO/TR 7637/1 Level 4 with External Capacitor (C2) 1. Description Low-power Flasher IC with 18-mΩ Shunt The U6432B is an advanced automotive flasher IC which provides low standby current. Its basic function is equal to Atmel’s flasher IC U6043B but low current consumption and frequency doubling disabling make outstanding differences. U6432B 4725C–AUTO–10/06 2. Block Diagram Figure 2-1. Car Flasher Application 6 VS 2 G5 + K3 V S-57 mV - G3 10 µF 4.7 µF K2 + R1 C2 T1 C1 VS D1 21 V 4 K1 + 6.2 V - D2 V S-57 mV - 82 kΩ G4 G2 G1 5 T2 V S-6 V 49 a 3 7 8 1 Shunt VS R2 1.2 kΩ PL >1 W 2 R6 R3 18 mΩ 470 Ω R4 5.1 kΩ U6432B 4725C–AUTO–10/06 U6432B 3. Pin Configuration Figure 3-1. Pinning GND 1 8 SI VS 2 7 LD U6432B Table 3-1. REL 3 6 VS OSC 4 5 OSC Pin Description Pin Symbol Function 1 GND IC ground 2 VS 3 REL Supply voltage Relay driver 4 OSC Oscillator 5 OSC Oscillator 6 VS Supply voltage 7 LD Lamp failure detection 8 SI Start input (49a) 3 4725C–AUTO–10/06 4. Functional Description 4.1 Pin 1, GND The U6432B is protected against damage in case of battery reversal via resistor R 4 to ground (–31). An integrated protection circuit together with external resistances R2 and R4 limits the current pulses in the IC. 4.2 Pin 2, Supply Voltage, VS Power The arrangement of the supply connections to pin 2 (and 6) 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. 4.3 Pin 3, Relay Control Output (Driver) The relay control output is a high-side driver with a low saturation voltage. It is capable of driving a typical automotive relay with a minimum coil resistance of 60Ω. 4.4 Pins 4 and 5, Oscillator The flashing frequency, f1, is determined by the R1C1 components as given by the formula below (see Figure 2-1 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 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) 4.5 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. 4.6 4.6.1 4 Pin 7 Control Signal Threshold (49-mV Comparator) 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. U6432B 4725C–AUTO–10/06 U6432B 4.6.2 Control Signal Threshold 2 (15-mV Comparator) A voltage drop at the shunt resistor R3 between 49 mV and 15 mV lets the flasher work in frequency doubling mode. If the voltage drop decreases to a value below VR3MAX = 15 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. Flasher operation starts with a lamp load of PL ≥ 1W. 4.7 Pin 8, Start Input Start condition for flashing: • Voltage at pin 8 (see Figure 2-1 on page 2) • V8 ≤VS – (VBE(T1) + VZ(D2)) Condition for standby: The resistor R2 between VS and pin 8 provides an extremely low standby current (IS ≤10 µA). The leakage current depends on the pull-up resistor R2 according to the following formula: ILeak ≈ (VBE(T1) + VZ(D2)) / R2 5. Application Hint In order to achieve a high-level immunity against “electrical interference by conduction and coupling” according to ISO/TR 7637/1 test level 4, an electrolytic capacitor C2 = 10 µF (25V) between pin 1 and 2 – mounted close to the IC – is highly recommended. 5 4725C–AUTO–10/06 6. 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 Pins 2 and 6 VS 18 V tP = 0.1 ms tP = 300 ms tP = 300 ms Pins 2 and 6 Pins 2 and 6 Pin 8 IFSM IFSM IFSM 1.5 1.0 30 A A mA Output current Pin 3 IO 0.3 A SO8 SO8 Ptot Ptot 340 560 mW mW TJ 150 °C Ambient temperature range Tamb –40 to +105 °C Storage temperature range Tstg –55 to +150 °C Supply voltage Surge Forward Current Power Dissipation Tamb = 95°C Tamb = 60°C Junction temperature 7. Electrical Characteristics Tamb = 25° C; typical values under normal operation in application circuit Figure 2-1 on page 2, VS = 12V (pins 2 and 6); reference point ground (–31), unless otherwise specified. Parameters Test Conditions Supply voltage range Pins 2 and 6 Symbol Min. VS 9 Supply current, dark phase Pins 2 and 6 IS Supply current, stand-by Pins 2 and 6 IS Supply current, bright phase Pins 2 and 6 IS Relay output, saturation voltage IO = 150 mA VS = 9V, pin 3 Relay output reverse current Pin 3 Relay coil resistance Start delay 4.5 Max. Unit 16.5 V 8 mA 10 µA 11 mA VO 1.0 V IO 0.1 mA RL First bright phase Typ. 7.0 Ω 60 ton Frequency determining resistor R1 Frequency determining capacitor C1 10 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 VS = 9V VS = 12V, Pin 7 VR3 50 43 47 57 47 51 mV 15 mV Control signal threshold 2 VR3 Lamp load PL 6 1 53 45 49 W U6432B 4725C–AUTO–10/06 U6432B 8. Ordering Information Extended Type Number Package Remarks U6432B-MFPY SO8 Tubed, Pb-free U6432B-MFPG3Y SO8 Taped and reeled, Pb-free 9. Package Information Package: SO 8 Dimensions in mm 5±0.2 4.9±0.1 0.1+0.15 1.4 0.2 3.7±0.1 0.4 1.27 3.8±0.1 6±0.2 3.81 8 5 technical drawings according to DIN specifications 1 4 Drawing-No.: 6.541-5031.01-4 Issue: 1; 15.08.06 7 4725C–AUTO–10/06 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 4725C-AUTO-10/06 • Put datasheet in a new template • Pb-free logo on page 1 deleted • Section 7 “Electrical Characteristics” on page 6 changed 4725B-AUTO-08/05 • • • • Put datasheet in a new template Updated text to new style guide First page: Pb-free logo added Page 6: Ordering Information changed U6432B 4725C–AUTO–10/06 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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