U641B Datasheet

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Features

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Interval Pause: 4s to 20s

After-wiping Time: 2s to 20s

Wiper Motor鈥檚 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

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.

Interval and

Wipe/Wash

Wiper Control

IC with Delay

U641B

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.

Rev. 4773B鈥揂UTO鈥?9/05

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