Features • • • • • • • • • • 2-kV ESD Protection Two Comparators with Common Reference Tight Threshold Tolerance Threshold Matched to PTC Characteristic of Incandescent Lamps Temperature Compensated NPN Output Interference and Damage-protection According to VDE 0839 EMI Protection Reversal Polarity Protection Load-dump Protection Automotive Lamp-outage Monitor IC 1. Description The monolithic integrated bipolar circuit, U479B, is designed as a monitor for lamp failure in automobiles. The comparator threshold is matched to the PTC characteristic of incandescent lamps. The threshold is tied to V4,6 = VS – VT where VT = 8 mV. U479B If the voltage drop across the shunt resistor, Rsh, exceeds 8 mV, the output is turned off, otherwise, the output is turned on. Without supply voltage or open input pin 8, the output is turned off. A comparator input, which is not used, must be connected to pin 7. Figure 1-1. Schematic and Application Circuit VS VBatt 2 7 Rsh Z2 5 + 4 OUT1 & 0.6 VS Rsh + 8 3 + OUT2 & 6 1 Lamps R1 150 Ω Rev. 4775B–AUTO–09/05 2. Pin Configuration Figure 2-1. Table 2-1. 2 Pinning DIP8/SO8 GND 1 8 INPUT VS 2 7 VREF OUT2 3 6 IN2 1N1 4 5 OUT1 Pin Description Pin Symbol 1 GND 2 VS 3 OUT2 4 IN1 5 OUT1 Function Reference point, ground Supply voltage Output 2 Input 1 Output 1 6 IN2 7 VREF Input 2 Reference voltage 8 INPUT Input switch U479B 4775B–AUTO–09/05 U479B 3. 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. Parameters Pin Symbol Value Unit Supply voltage 2, 7 VS 16.5 V 1 I1 1.5 A Output current 3, 5 I3,5 20 mA Input voltage Reference point pin 7 4, 6 -V4,6 6 V DIP8 SO8 Ptot Ptot 420 360 mW mW DIP8 SO8 Ptot Ptot 690 560 mW mW Ambient temperature range Tamb –40 to +95 °C Storage temperature range Tstg –55 to +125 °C Tj 150 °C Current consumption, t = 2 ms Power dissipation Tamb = 95°C Tamb = 60°C Junction temperature 4. Thermal Resistance Parameters Junction ambient Symbol Value Unit DIP8 RthJA 110 K/W SO8 RthJA 160 K/W 3 4775B–AUTO–09/05 5. Electrical Characteristics VS = 9V to 15V, Tamb = –40 to +95°C, Figure 1-1 on page 1, unless otherwise specified. Parameters Test Conditions Supply voltage Pin Symbol Min. 2, 7 VS 9 20 2 VZ 1 I1 VS = 9V, I3,5 = 10 mA Tamb = 25°C 3, 5 Vsat Control signal threshold Reference point VPin 7 I3,5 = 3 mA VS = 12V VS = 15V 4, 6 Voltage drift V T(15 V) – V T(12 V) ∆V = -------------------------------------------15 V – 12 V Threshold voltage Switch identification Internal Z-diode Z2 Current consumption VS = 12V Output saturation voltage Input currents Delay time Input 1/input 2 Input switch Switch-on, high to low Max. Unit 15 V 6 mA 0.5 V 9.5 10.8 mV mV V 4.5 6.5 7.8 –VT –VT 8 9.3 ∆V 0.45 mV/V 8 V8 0.6 VS V 4, 6 II 100 nA 8 II 5 µA 3, 5 td(on) 6 µs td(off) 30 µs Switch-off, low to high Figure 5-1. Typ. Delay Times V4,6 12.00 11.95 V td(off) td(on) V0 12 6 V 0 10 20 30 40 50 60 µs t 4 U479B 4775B–AUTO–09/05 U479B 6. Ordering Information Extended Type Number Package Remarks U479B-MY DIP8 Pb-free U479B-MFPY SO8 Tubed, Pb-free U479B-MFPG3Y SO8 Taped and reeled, Pb-free 7. Package Information P a c k a g e D IP 8 D im e n s io n s in m m 7 .7 7 7 .4 7 9 .8 9 .5 1 .6 4 1 .4 4 4 .8 m a x 6 .4 m a x 0 .5 m in 0 .5 8 0 .4 8 3 .3 0 .3 6 m a x 9 .8 8 .2 2 .5 4 7 .6 2 8 5 te c h n ic a l d ra w in g s a c c o rd in g to D IN s p e c ific a tio n s 1 4 5 4775B–AUTO–09/05 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 8. Revision History Please note that the following page numbers referred to in this section refer to the specific revision mentioned, not to this document. 6 Revision No. History 4775B-AUTO-09/05 • Put datasheet in a new template • Pb-free logo on page 1 added • Ordering Information on page 5 changed U479B 4775B–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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