U642B-M

Features • • • • • • • • Interval Pause: 4 to 20 s After-wiping Time: 2 to 20 s Wiper Motor's Park Switch Wipe/Wash Mode Priority One External Capacitor Determines All Time Sequences Relay Driver with Z-diode Interference Protection According to VDE 0839 or ISO/TR 7637/1 Load-dump Protected Description The U642B is a bi-polar integrated circuit designed for the wiper application in the automotive market. It includes wipe, wash and internal mode. Functional Description As a convenience feature of the windshield wiper, intermittent and wipe/wash operation fuctions are implemented in most of the automobiles. The U642B is a cost-effective solution for an accurate timing function control. Wipe/wash mode has priority over interval mode. Interval pause and after-wiping time can be set to fixed values by using resistors in a broad time range. Added value can be provided with an individual, continuous adjustment of the interval pause by a potentiometer which may be built into the stalk. For proper operation, it is mandatory to feed the signal of the wiper motor's park switch into U642B. Interval- and Wipe/Wash Wiper Control IC U642B Figure 1. Block Diagram VS PARK OUT 8 7 WASH 6 5 VRef VRef Park switch comparator Load-dump comparator Input comparator VRef Logic Wipe/wash comparator VRef Interval comparator A B C D E F 1 2 3 4 GND INT Ct Rt Rev. 4774A–AUTO–11/03 Pin Configuration Figure 2. Pinning GND 1 8 VS INT 2 7 OUT CT 3 6 PARK RT 4 5 WASH U642B Pin Description 2 Pin Symbol Function 1 GND 2 INT Interval switch 3 CT Timing capacitor C2 4 RT After-wiping time resistance 5 WASH 6 PARK Park switch for wiper motor 7 OUT Relay control output 8 VS Ground Wipe/wash switch Supply voltage terminal 15 U642B 4774A–AUTO–11/03 U642B Circuit Description Interval Function, Pin 2 By closing the interval switch, S2, to supply voltage, VBatt, the relay is activated. The internal current source (pin 3) which holds the capacitor C 2 in a charged state is switched-off. As soon as there is a positive potential at the park switch (S1), the current source F (see Figure 1 on page 1) charges the capacitor C2 very quickly. After the wiper operation is finished, S1 is again at ground potential, the relay is in the off position - interval pause begins - the capacitor C2 is discharged through the current source C, till the voltage at pin 3 is below the threshold of 2 V. Interval pause can be adjusted between 4 s to 20 s with the help of potentiometer R3. Now the relay switches on and the next interval cycle begins. Opening of switch S2 causes the current source A to discharge C2 immediately and current sources C and F are switched-off. Wipe/Wash (WIWA) Operation, Pin 5 By closing the WIWA switch, S3, to supply voltage, VBatt, the water pump starts spraying water on the windshield. During this function, the current source A is switched-off which keeps the capacitor C2 in a discharged state. Now the capacitor is charged through the current sources D and F. If (after a time interval of approximately 100 ms) the voltage at the capacitor is greater than 6.5 V, the relay is turned on as long as the switch WIWA is closed. The after-wiping time begins when the switch is open, the sources D and F are switched off and the source E is activated. Source E discharges the capacitor until the voltage is less than 2.2 V. The relay is off and the wiper-motor is supplied via the park switch until the park position is reached. The after-wiping time is determined by the current source E which can be regulated with the external resistor RTime. When the after-wiping time has elapsed, the source A discharges the capacitor. The relay switch is independent of the park switch S1. Interval and WIWA Functions The interval function is interrupted immediately when the wipe/wash mode is activated. The current source A discharges the capacitor to a value of 2 V, afterwards, the normal wash function starts. Interval wiping starts immediately when the after-wipe time is over. The switching delays are slightly shorter, because the capacitor is already charged to a value of 2 V. The wipe/wash function is not interrupted when the interval switch S2 is activated. The interval function begins after the WIWA function has elapsed. 3 4774A–AUTO–11/03 Figure 3. Application Circuit with Interval and Wipe/Wash Operation 10 kΩ 7 8 Relay 47 µF 10 V R6 10 kΩ R5 6 5 3 4 U642B C1 1 2 2.7 kΩ R2 C2 R1 22 µF R4 510 Ω Rtime = 130 KΩ R3 S1 S2 10 kΩ WIWA Park switch M M S3 31 Wiper motor 4 Interval switch 15 Water pump U642B 4774A–AUTO–11/03 U642B 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 t = 60 s, terminal 15 8 VBatt 28 V Supply current t = 2 ms t = 200 ms 8 I8 I8 1.5 150 A mA Relay control output current (DC) t = 200 ms 7 I7 I7 200 1.2 mA A I6 I5 I2 50 50 50 mA Power dissipation Tamb = 90°C Ptot 500 mW Storage temperature range Tstg -55 to +125 °C Ambient temperature range Tamb -40 to +85 °C Symbol Value Unit DIP8 RthJA 120 K/W SO8 RthJA 160 K/W Pulse Current (Control Inputs) t = 200 ms 6 5 2 Park switch, S1 Wipe/Wash switch, S3 Interval switch, S2 Thermal Resistance Parameters Junction ambient 5 4774A–AUTO–11/03 Electrical Characteristics VBatt = 12 V, Tamb = 25°C, reference point is pin 8 (see Figure 3 on page 4) unless otherwise specified. Parameters Test Conditions Pin Supply voltage Symbol Min. VBatt 9 Typ. Max. 16.5 Unit V I8 10 mA V1 7.6 V Threshold current I1 -50 mA Threshold voltage VBatt 35 V Supply current 8 Z-diode limitation Overvoltage Relay Control Output Saturation voltage 7 I7 = 100 mA I7 = 200 mA 100 µA R6 = 10 kW R6 50 kW V6 -3.3 V I6 = -10 mA I6 = 10 mA V6 V6 -0.8 7.6 V V R3 100 W V2 -0.8 7.6 V V5 -1.4/ -5.4 V V -0.8 7.6 V Park Switch 6 Switching threshold voltage Protection diode 3 Input Ct Internal resistance Interval Input R2 = 2.7 to 30 kW Protection diode I2 = -10 mA I2 = 30 mA/10 ms WASH Input R5 = 10 kW 2 5 Switching threshold/ Hysteresis Protection diode I5 = -10 mA I5 = 10 mA Switching Characteristics R4 = 47 kW to 300 kW, I4 = -150 µA Interval time R3 = 0 kW R3 = 10 kW t2 Prewash delay After-wipe-time 6 V I7 Leakage current Internal pull-up resistance -1.0 -1.5 V7 3.6 10.8 5 t5 4.4 13.2 100 tdel R4 = 130 kW 4 12 4.75 5.25 s ms 5.75 s U642B 4774A–AUTO–11/03 U642B Diagrams Figure 4. Interval Pause = f (T); Ct = 22 µF 12 Interval Pause (s) Rint = 0 10 Rint = 5 kΩ 8 6 Rint = 10 kΩ 4 2 0 -40 -20 0 20 40 60 80 100 Temperature (°C) Figure 5. After-wiping Time = f (T); Ct = 22 µF; VBatt = 8 V Afterwiping Time (s) 12 Rtime = 51 kΩ 10 8 VBatt = 8 V 6 Rtime = 130 kΩ 4 Rtime = 300 kΩ 2 0 -40 -20 0 20 40 60 80 100 Temperature (°C) Figure 6. Interval Pause = f (RINT); Ct = 22 µF 16 Interval Pause (s) 14 12 10 8 6 4 2 0 0 2 4 6 8 10 12 14 16 18 20 Interval Resistor (kΩ) 7 4774A–AUTO–11/03 Figure 7. After-wiping Time = f (T); Ct = 22 µF; VBatt = 16 V Afterwiping Time (s) 12 Rtime = 51 kΩ 10 8 VBatt = 16 V Rtime = 130 kΩ 6 4 Rtime = 300 kΩ 2 0 -40 -20 0 20 40 60 80 100 Temperature (°C) 8 U642B 4774A–AUTO–11/03 U642B Ordering Information Extended Type Number Package Remarks U642B DIP8 – U642B-FP SO8 – Package Information Package DIP8 Dimensions in mm 7.77 7.47 9.8 9.5 1.64 1.44 4.8 max 6.4 max 0.5 min 3.3 0.58 0.48 0.36 max 9.8 8.2 2.54 7.62 8 5 technical drawings according to DIN specifications 1 4 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 9 4774A–AUTO–11/03 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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