Features • • • • • • • • Interval Pause: 4s to 20s After-wiping Time: 2s to 20s 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 1. 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. 2. Functional Description As a convenience feature of the windshield wiper, intermittent and wipe/wash operation functions 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 4774C–AUTO–10/07 Figure 2-1. 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 2 A B C D E F 1 2 3 4 GND INT Ct Rt U642B 4774C–AUTO–10/07 U642B 3. Pin Configuration Figure 3-1. Pinning GND 1 8 VS INT 2 7 OUT CT 3 6 PARK RT 4 5 WASH U642B Table 3-1. Pin Description Pin Symbol Function 1 GND 2 INT Interval switch 3 CT Timing capacitor C2 4 RT After-wiping time resistance 5 WASH Wipe/wash switch 6 PARK Park switch for wiper motor 7 OUT Relay control output 8 VS Ground Supply voltage terminal 15 3 4774C–AUTO–10/07 4. Circuit Description 4.1 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 C2 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 2-1 on page 2) 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 2V. Interval pause can be adjusted between 4s to 20s 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. 4.2 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 6.5V, 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 2.2V. 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. 4.3 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 2V, 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 2V. The wipe/wash function is not interrupted when the interval switch S2 is activated. The interval function begins after the WIWA function has elapsed. 4 U642B 4774C–AUTO–10/07 U642B Figure 4-1. Application Circuit with Interval and Wipe/Wash Operation 10 kΩ 7 8 Relay 47 µF 10V R6 10 kΩ R5 6 5 3 4 U642B C1 1 2 2.7 kΩ R2 C2 R1 22 µF R4 510Ω Rtime = 130 KΩ R3 S1 S2 10 kΩ WIWA Park switch M M S3 31 Wiper motor Interval switch 15 Water pump 5 4774C–AUTO–10/07 5. 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 = 60s, 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 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 Power dissipation Tamb = 90°C 6. Thermal Resistance Parameters Junction ambient 6 U642B 4774C–AUTO–10/07 U642B 7. Electrical Characteristics VBatt = 12V, Tamb = 25°C, reference point is pin 8 (see Figure 4-1 on page 5) unless otherwise specified. Parameters Test Conditions Pin Supply voltage Supply current 8 Z-diode limitation Symbol Min. VBatt 9 Typ. Max. Unit 16.5 V I8 10 mA V1 7.6 V I1 –50 mA VBatt 35 V Overvoltage Threshold current Threshold voltage Relay Control Output Saturation voltage 7 I7 = 100 mA I7 = 200 mA Leakage current Park Switch Internal pull-up resistance I6 = –10 mA I6 = 10 mA I7 100 µA R6 50 kΩ V6 –3.3 V V6 V6 –0.8 7.6 V V R3 100 Ω V2 –0.8 7.6 V V5 –1.4/ –5.4 V V –0.8 7.6 V 3 Input Ct Internal resistance Interval Input R2 = 2.7 to 30 kΩ Protection diode I2 = –10 mA I2 = 30 mA/10 ms WASH Input R5 = 10 kΩ 2 5 Switching threshold/ Hysteresis Protection diode I5 = –10 mA I5 = 10 mA Switching Characteristics R4 = 47 kΩ to 300 kΩ, I4 = –150 µA Interval time R3 = 0 kΩ R3 = 10 kΩ t2 Prewash delay After-wipe-time V 6 R6 = 10 kΩ Switching threshold voltage Protection diode –1.0 –1.5 V7 3.6 10.8 5 t5 4.4 13.2 100 tdel R4 = 130 kΩ 4 12 4.75 5.25 s ms 5.75 s 7 4774C–AUTO–10/07 8. Diagrams Figure 8-1. Interval Pause = f (T); Ct = 22 µF 12 Interval Pause (s) Rint = 10 kΩ 10 Rint = 5 kΩ 8 6 Rint = 0 4 2 0 -40 -20 0 20 40 60 80 100 Temperature (˚C) Figure 8-2. After-wiping Time = f (T); Ct = 22 µF; VBatt = 8V Afterwiping Time (s) 12 Rtime = 300 kΩ 10 8 VBatt = 8V 6 Rtime = 130 kΩ 4 Rtime = 51 kΩ 2 0 -40 -20 0 20 40 60 80 100 Temperature (˚C) Figure 8-3. 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) 8 U642B 4774C–AUTO–10/07 U642B Figure 8-4. After-wiping Time = f (T); Ct = 22 µF; VBatt = 16V Afterwiping Time (s) 12 Rtime = 300 kΩ 10 8 VBatt = 16V Rtime = 130 kΩ 6 4 Rtime = 51 kΩ 2 0 -40 -20 0 20 40 60 80 100 Temperature (˚C) 9 4774C–AUTO–10/07 9. Ordering Information Extended Type Number Package U642B-MY Remarks DIP8 Pb-free U642B-MFPY SO8 Tubed, Pb-free U642B-MFPG3Y SO8 Taped and reeled 10. Package Information 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 10 U642B 4774C–AUTO–10/07 U642B 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 11. 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. 4774C-AUTO-09/07 4774B-AUTO-09/05 History • • • • • Put datasheet in a new template Pb-free logo on page 1 deleted Figure 8-1 “Interval Pause = f (T); Ct = 22 µF” on page 8 changed Figure 8-2 “After-wiping Time = f (T); Ct = 22 µF; VBatt = 8V” on page 8 changed Figure 8-4 “After-wiping Time = f (T); Ct = 22 µF; VBatt = 16V” on page 9 changed • Put datasheet in a new template • Pb-free logo on page 1 added • Ordering Information on page 10 changed 11 4774C–AUTO–10/07 Headquarters International Atmel Corporation 2325 Orchard Parkway San Jose, CA 95131 USA Tel: 1(408) 441-0311 Fax: 1(408) 487-2600 Atmel Asia Room 1219 Chinachem Golden Plaza 77 Mody Road Tsimshatsui East Kowloon Hong Kong Tel: (852) 2721-9778 Fax: (852) 2722-1369 Atmel Europe Le Krebs 8, Rue Jean-Pierre Timbaud BP 309 78054 Saint-Quentin-en-Yvelines Cedex France Tel: (33) 1-30-60-70-00 Fax: (33) 1-30-60-71-11 Atmel 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 Technical Support [email protected] Sales Contact www.atmel.com/contacts Product Contact Web Site www.atmel.com Literature Requests www.atmel.com/literature Disclaimer: The information in this document is provided in connection with Atmel products. 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