U641B ATMEL Corporation, U641B Datasheet

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U641B

Manufacturer Part Number
U641B
Description
INTERVAL AND WIPE/WASH WIPER CONTROL IC WITH DELAY
Manufacturer
ATMEL Corporation
Datasheet
Features
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
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
GND
V
S
1
8
V
V
Ref
Load-dump
comparator
Ref
comparator
Interval
OUT
7
A
INT
2
B
PARK
Logic
C
6
Park switch
comparator
V
C
D
3
Ref
t
WASH
E
5
comparator
F
V
Input
Ref
Wipe/wash
comparator
R
4
t
Interval and
Wipe/Wash
Wiper Control
IC with Delay
U641B
Rev. 4773A–AUTO–11/03

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U641B Summary of contents

Page 1

... 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 ...

Page 2

... 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 motor 7 OUT Relay control output 8 VS Supply voltage terminal 15 U641B GND OUT 7 2 INT U641B PARK WASH 4773A–AUTO–11/03 ...

Page 3

... After the wiper opera Now the relay switches on and the next interval 3 causes current source A to discharge C , the water pump starts spraying Batt . When the after-wiping time has Time 2 U641B ), current source F 1 immediately 2 is activated. The cur- is activated. The 2 3 ...

Page 4

... Figure 3. Application Circuit with Interval and Wipe/Wash Operation Relay S 1 Park switch M Wiper motor U641B µF U641B 2 510 R time Interval switch µ 130 K WIWA Water pump 4773A–AUTO–11/03 ...

Page 5

... Ambient temperature range Thermal Resistance Parameters DIP8 Junction ambient SO8 4773A–AUTO–11/03 Pin Symbol 8 V Batt tot T stg T amb Symbol R thJA R thJA U641B Value Unit 28 1.5 150 mA 200 mA 1 500 mW °C -55 to +125 °C -40 to +85 Value Unit 120 K/W 160 K ...

Page 6

... Protection diode Input C t Internal resistance Interval Input - Protection diode mA/ WASH Input R 5 Switching threshold/ Hysteresis Protection diode Switching Characteristics Interval time R 3 Prewash delay After-wipe-time R 4 U641B 6 Pin 2 300 kW -150 µ 130 kW 5 Symbol Min. Typ. Max 16.5 Batt 7 - Batt -1 ...

Page 7

... Figure 5. After-wiping Time = f (T Batt -40 -20 Figure 6. Prewash Time = f (T); C 1.0 0.8 0.6 0.4 0.2 0.0 -40 - µ int int int Temperature (° µ Batt time R = 130 k time R = 300 k time Temperature (° µ Batt Batt Temperature (°C) U641B 100 100 100 7 ...

Page 8

... U641B 8 Figure 7. Interval Pause = f (R INT Figure 8. After-wiping Time = f (T Batt -40 - µ Interval Resistor ( µ Batt time R = 130 k time R = 300 k time Temperature (°C) 20 100 4773A–AUTO–11/03 ...

Page 9

... DIN specifications 1 4 5.00 4.85 1.4 0.25 0.4 0.10 1.27 3. technical drawings according to DIN specifications 1 4 7.77 7.47 6.4 max 0.36 max 9.8 8.2 5.2 4.8 3.7 0.2 3.8 6.15 5.85 U641B 9 ...

Page 10

... Fax: (81) 3-3523-7581 Disclaimer: Atmel Corporation makes no warranty for the use of its products, other than those expressly contained in the Company’s standard warranty which is detailed in Atmel’s Terms and Conditions located on the Company’s web site. The Company assumes no responsibility for any errors which may appear in this document, reserves the right to change devices or specifications detailed herein at any time without notice, and does not make any commitment to update the information contained herein ...

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