Features

• 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

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 2-1. Block Diagram

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