U641B_05 ATMEL [ATMEL Corporation], U641B_05 Datasheet

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U641B_05

Manufacturer Part Number
U641B_05
Description
Interval and Wipe/Wash Wiper Control IC with Delay
Manufacturer
ATMEL [ATMEL Corporation]
Datasheet
Features
1. 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.
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 U641B 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 the U641B.
Interval Pause: 4s to 20s
After-wiping Time: 2s to 20s
Wiper Motor’s Park Switch
0.6s 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
Interval and
Wipe/Wash
Wiper Control
IC with Delay
U641B
Rev. 4773B–AUTO–09/05

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U641B_05 Summary of contents

Page 1

Features • Interval Pause 20s • After-wiping Time 20s • Wiper Motor’s Park Switch • 0.6s Prewash Delay • Wipe/Wash Mode Priority • One External Capacitor Determines All Time Sequences • Relay Driver with Z-diode • ...

Page 2

Figure 2-1. Block Diagram V GND U641B 2 PARK OUT Load-dump comparator V Ref Logic V Ref Interval comparator 1 2 INT WASH Ref Ref Park switch Input comparator comparator ...

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Pin Configuration Figure 3-1. Pinning Table 3-1. Pin Description Pin Symbol Function 1 GND Ground 2 INT Interval switch 3 CT Timing capacitor After-wiping time resistance 5 WASH Wipe/wash switch 6 PARK Park switch for wiper ...

Page 4

Circuit Description 4.1 Interval Function, Pin 2 By closing the interval switch, S rent source (pin 3) which holds the capacitor C there is a positive potential at the park switch (S charges the capacitor C potential, the relay ...

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Figure 4-1. Application Circuit with Interval and Wipe/Wash Operation Relay S 1 Park switch M Wiper motor 4773B–AUTO–09/ µF U641B 2 ...

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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 ...

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Electrical Characteristics V = 12V 25°C, reference point is pin 8 (see Batt amb Parameters Test Conditions Supply voltage Supply current Z-diode limitation Overvoltage Threshold current Threshold voltage Relay Control Output I 7 Saturation voltage I 7 ...

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Diagrams Figure 8-1. Figure 8-2. Figure 8-3. U641B 8 Interval Pause = f (T µ -40 - Temperature (°C) After-wiping Time = f (T ...

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Figure 8-4. Figure 8-5. 4773B–AUTO–09/05 Interval Pause = µF INT Interval Resistor (k ) After-wiping Time = f (T); ...

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Ordering Information Extended Type Number U641B-MY U641B-MFPY U641B-MFPG3Y 10. Package Information Package: DIP8 Dimensions in mm 2.54 nom. Drawing-No.: 6.543-5040.01-4 Issue: 1; 16.01.02 U641B 10 Package DIP8 SO8 SO8 9.8 max. 9.6 ±0.1 1.2 ±0.3 0.53 ±0. ...

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Package SO8 Dimensions in mm 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. 4773B-AUTO-09/05 4773B–AUTO–09/05 5.00 4.85 1.4 0.25 0.4 0.10 ...

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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 ...

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