U642B ATMEL | Alldatasheet
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- 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 opera- tion 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 val- ues 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
4774C–AUTO–10/07 U642B Figure 2-1. Block Diagram Wipe/wash comparator Interval comparator Load-dump comparator Input comparator Park switch comparator 87 6 5 412 3 ABC DEF Logic VS OUT PARK WASH RtGND INT VRef VRef VRef VRef Ct
4774C–AUTO–10/07 U642B 3. Pin Configuration Figure 3-1. Pinning VS OUT WASH GND INT RT CT U642B PARK Table 3-1. Pin Description Pin Symbol Function
1 GND Ground
2 INT Interval switch
3 CT Timing capacitor C
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 Supply voltage terminal 15
4774C–AUTO–10/07 U642B 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 cur- rent 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 2-1 on page 2) charges the capacitor C 2 very quickly. After the wiper operation is finished, S 1 is again at ground potential, the relay is in the off position - interval pause begins - the capacitor C 2 is dis- charged through the curren t source C, till the voltage at pi n 3 is below the threshold of 2V. Interval pause can be adjusted between 4s to 20s with the help of potentiometer R 3. Now the relay switches on and the next interval cycle begins. Opening of switch S 2 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, S 3, to supply voltage, V Batt, 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 R Time . When the after-wiping time has elapsed, the source A dis- charges 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 cur- rent source A discharges the capacitor to a value of 2V, afterwards, the normal wash function starts. Interval wiping starts immediately when the afte r-wipe time is over. T he 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 S 2 is activated. The interval function begins after the WIWA function has elapsed.
4774C–AUTO–10/07 U642B Figure 4-1. Application Circuit with Interval and Wipe/Wash Operation 1 2 6 58 7 3 4 10 kΩ R6 47 µF 10V 22 µF Rtime = 130 KΩ510Ω 10 kΩ MM Relay Park switch Wiper motor Interval switch Water pump WIWA U642B 2.7 kΩ 10 kΩR5
4774C–AUTO–10/07 U642B 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 V Batt 28 V Supply current t = 2 ms t = 200 ms 8I 8 1.5 150 A mA Relay control output current (DC) t = 200 ms 7 I7 200 1.2 mA A Pulse Current (Control Inputs) t = 200 ms Park switch, S1 Wipe/Wash switch, S3 Interval switch, S2 mA Power dissipation Tamb = 90°C P tot 500 mW Storage temperature range T stg –55 to +125 °C Ambient temperature range T amb –40 to +85 °C 6. Thermal Resistance Parameters Symbol Value Unit Junction ambient DIP8 R thJA 120 K/W SO8 R thJA 160 K/W
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 Symbol Min. Typ. Max. Unit Supply voltage V Batt 91 6 . 5 V Supply current I 8 10 mA Z-diode limitation V 1 7.6 V Overvoltage Threshold current I1 –50 mA Threshold voltage V Batt 35 V Relay Control Output 7 Saturation voltage I7 = 100 mA I7 = 200 mA V7 –1.0 –1.5 V Leakage current I 7 100 µA Park Switch 6 Internal pull-up resistance R 6 = 10 kΩ R6 50 k Ω Switching threshold voltage V 6 –3.3 V Protection diode I6 = –10 mA I6 = 10 mA –0.8 7.6 V V Input Ct 3 Internal resistance R 3 100 Ω Interval Input R2 = 2.7 to 30 kΩ 2 Protection diode I2 = –10 mA I2 = 30 mA/10 ms V2 –0.8 7.6 V WASH Input R5 = 10 kΩ 5 Switching threshold/ Hysteresis V5 –1.4/ –5.4 V Protection diode I5 = –10 mA I5 = 10 mA V –0.8 7.6 V Switching Characteristics R4 = 47 kΩ to 300 kΩ, I4 = –150 µA Interval time R3 = 0 kΩ R3 = 10 kΩ t2 3.6 10.8 4.4 13.2 s Prewash delay t del 100 ms After-wipe-time R 4 = 130 kΩ 5t 5 4.75 5.25 5.75 s
4774C–AUTO–10/07 U642B Figure 8-4. After-wiping Time = f (T); Ct = 22 µF; VBatt = 16V -40 -20 0 20 40 60 80 100 Temperature (˚C) Afterwiping Time (s) Rtime = 130 kΩ Rtime = 51 kΩ Rtime = 300 kΩ VBatt = 16V
4774C–AUTO–10/07 U642B 10. Package Information 9. Ordering Information Extended Type Number Package Remarks U642B-MY DIP8 Pb-free U642B-MFPY SO8 Tubed, Pb-free U642B-MFPG3Y SO8 Taped and reeled Dimensions in mm specifications according to DIN technical drawings 9.8 max. 2.54 nom. 0.3 0.36 max. B 0.4 A A B 1.54 0.65 9.6±0.1 7.62±0.15 3.6±0.1 4.2±0.3 1.8 6.7 2.5 1.2±0.3 0.53±0.05 6.3±0.1 Issue: 1; 16.01.02 Drawing-No.: 6.543-5040.01-4
4774C–AUTO–10/07 U642B 11. Revision History Package: SO 8 Dimensions in mm specifications according to DIN technical drawings Issue: 1; 15.08.06 Drawing-No.: 6.541-5031.01-4 0.2 5±0.2 3.8±0.1 6±0.2 3.7±0.1 4.9±0.1 3.81 0.4 1.27 0.1+0.15 1.4 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 4774C-AUTO-09/07
- 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 4774B-AUTO-09/05
- Put datasheet in a new template
- Pb-free logo on page 1 added
- Ordering Information on page 10 changed
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