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Features
* * * * * * * * *
Interval Pause: 4 to 20 s After-wiping Time: 2 to 20 s Wiper Motor's Park Switch 0.6 s Prewash Delay 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 U641B 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 functions are implemented in most of the automobiles. The U641B is a costeffective 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 the U641B. Figure 1. Block Diagram
VS 8 OUT 7 PARK 6 VRef Park switch comparator WASH 5 VRef Input comparator
Interval and Wipe/Wash Wiper Control IC with Delay U641B
Load-dump comparator
VRef
Logic
VRef Wipe/wash comparator
Interval comparator
A
B
C
D
E
F
1 GND
2 INT
3 Ct
4 Rt
Rev. 4773A-AUTO-11/03
Pin Configuration
Figure 2. Pinning
GND INT CT RT 1 8 VS OUT PARK WASH
2
7
U641B
3 4 6 5
Pin Description
Pin 1 2 3 4 5 6 7 8 Symbol GND INT CT RT WASH PARK OUT VS Function Ground Interval switch Timing capacitor C2 After-wiping time resistance Wipe/wash switch Park switch for wiper motor Relay control output Supply voltage terminal 15
2
U641B
4773A-AUTO-11/03
U641B
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 C2 in charged state is switchedoff. As soon as there is a positive potential at the park switch (S1), 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 switch S2 causes current source A to discharge C2 immediately and current sources C and F are switched off. By closing the WIWA switch, S3, to supply voltage, VBatt, the water pump starts spraying the water on the windshield. During this function, the current source A is switched-off which keeps the capacitor C 2 in a discharged state. Now the capacitor is charged through the current source F. If (after a time interval of approximately 600 ms) the voltage at the capacitor is greater than 6.1 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.
Wipe/Wash (WIWA) Operation, Pin 5
Interval and WIWA Functions
The interval function is interrupted immediately when the switch S2 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
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Figure 3. Application Circuit with Interval and Wipe/Wash Operation
10 k
R6
R5
10 k
Relay
8
7
6
5
47 F 10 V
C1
U641B
1
2 C2
3 22 F R4
4
2.7 k R1 510
R2
Rtime = 130 K
R3 S1 Park switch M S3 31 Wiper motor Interval switch 15 Water pump
S2
10 k WIWA M
4
U641B
4773A-AUTO-11/03
U641B
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 Supply voltage t = 60 s, terminal 15 Supply current t = 2 ms t = 200 ms Relay control output current (DC) t = 200 ms Park switch, S1 Wipe/Wash switch, S3 Interval switch, S2 Power dissipation Tamb = 90C Storage temperature range Ambient temperature range Pin 8 8 Symbol VBatt I8 I8 I7 I7 I6 I5 I2 Ptot Tstg Tamb Value 28 1.5 150 200 1.2 50 50 50 500 -55 to +125 -40 to +85 Unit V A mA mA A
7
Pulse Current (Control Inputs) t = 200 ms 6 5 2 mA mW C C
Thermal Resistance
Parameters Junction ambient DIP8 SO8 Symbol RthJA RthJA Value 120 160 Unit K/W K/W
5
4773A-AUTO-11/03
Electrical Characteristics
VBatt = 12 V, Tamb = 25C, reference point is pin 8 (see Figure 3 on page 4) unless otherwise specified.
Parameters Supply voltage Supply current Z-diode limitation Overvoltage Threshold current Threshold voltage Relay Control Output Saturation voltage Leakage current Park Switch Internal pull-up resistance Switching threshold voltage Protection diode Input Ct Internal resistance Interval Input Protection diode WASH Input Switching threshold/ Hysteresis Protection diode Switching Characteristics Interval time Prewash delay After-wipe-time R4 = 130 kW 5 I5 = -10 mA I5 = 10 mA R4 = 47 kW to 300 kW, I4 = -150 A R3 = 0 kW R3 = 10 kW t2 tdel t5 4.75 3.6 10.8 4 12 600 5.25 5.75 4.4 13.2 s ms s R2 = 2.7 to 30 kW I2 = -10 mA I2 = 30 mA/10 ms R5 = 10 kW 5 V5 V -1.4/ -5.4 -0.8 7.6 V V 2 V2 -0.8 7.6 V I6 = -10 mA I6 = 10 mA 3 R3 100 W R6 = 10 kW 6 R6 V6 V6 V6 50 -3.3 -0.8 7.6 kW V V V I7 = 100 mA I7 = 200 mA 7 V7 I7 100 -1.0 -1.5 V A I1 VBatt -50 35 mA V 8 Test Conditions Pin Symbol VBatt I8 V1 Min. 9 10 7.6 Typ. Max. 16.5 Unit V mA V
6
U641B
4773A-AUTO-11/03
U641B
Diagrams
Figure 4. Interval Pause = f (T); Ct = 22 F
12
Interval Pause (s)
Rint = 0 10 Rint = 5 k
8
6 Rint = 10 k
4
2
0 -40 -20 0 20 40 60 80 100
Temperature (C)
Figure 5. After-wiping Time = f (T); Ct = 22 F; VBatt = 8 V
12 Rtime = 51 k
After-wiping Time (s)
10
8 VBatt = 8 V 6 Rtime = 130 k
4 Rtime = 300 k 2
0 -40 -20 0 20 40 60 80 100
Temperature (C)
Figure 6. Prewash Time = f (T); Ct = 22 F
1.0
Prewash Delay (s)
0.8 VBatt = 16 V 0.6 VBatt = 8 V 0.4
0.2
0.0 -40 -20 0 20 40 60 80 100
Temperature (C)
7
4773A-AUTO-11/03
Figure 7. Interval Pause = f (RINT); Ct = 22 F
16 14
Interval Pause (s)
12 10 8 6 4 2 0 0 2 4 6 8 10 12 14 16 18 20
Interval Resistor (k)
Figure 8. After-wiping Time = f (T); Ct = 22 F; VBatt = 16 V
12
After-wiping Time (s)
10
Rtime = 51 k
8 VBatt = 16 V 6 Rtime = 130 k
4 Rtime = 300 k 2
0 -40 -20 0 20 40 60 80 100
Temperature (C)
8
U641B
4773A-AUTO-11/03
U641B
Ordering Information
Extended Type Number U641B U641B-FP Package DIP8 SO8 Remarks - -
Package Information
Package DIP8
Dimensions in mm
9.8 9.5 1.64 1.44 7.77 7.47
4.8 max 6.4 max 0.5 min 3.3 0.58 0.48 7.62 8 5 2.54 0.36 max 9.8 8.2
technical drawings according to DIN specifications
1
4
Package SO8
Dimensions in mm
5.00 4.85 1.4 0.4 1.27 3.81 8 5 0.25 0.10
5.2 4.8 3.7
0.2 3.8 6.15 5.85
technical drawings according to DIN specifications
1
4
9
4773A-AUTO-11/03
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4773A-AUTO-11/03

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