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Atmel Electronic Components Datasheet

U641B Datasheet

INTERVAL AND WIPE/WASH WIPER CONTROL IC

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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 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.
Figure 1. Block Diagram
VS
8
OUT
7
PARK
6
VRef
WASH
5
VRef
Load-dump
comparator
Park switch Input
comparator comparator
Interval and
Wipe/Wash
Wiper Control
IC with Delay
U641B
VRef
VRef
Logic
Wipe/wash
comparator
Interval
comparator
A
B
C
DE
F
1
GND
23
INT Ct
4
Rt
Rev. 4773A–AUTO–11/03


Atmel Electronic Components Datasheet

U641B Datasheet

INTERVAL AND WIPE/WASH WIPER CONTROL IC

No Preview Available !

Pin Configuration
Figure 2. Pinning
GND 1
8 VS
INT 2
CT 3
U641B
7 OUT
6 PARK
RT 4
5 WASH
Pin Description
Pin Symbol
1 GND
2 INT
3 CT
4 RT
5 WASH
6 PARK
7 OUT
8 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


Part Number U641B
Description INTERVAL AND WIPE/WASH WIPER CONTROL IC
Maker ATMEL Corporation
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U641B Datasheet PDF






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1 U641B INTERVAL AND WIPE/WASH WIPER CONTROL IC
ATMEL Corporation





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