Anterwell Technology Ltd.
Anterwell Technology Ltd. Large Original stock of IC Electronics Components, Transistors, Diodes etc. High Quality, Reasonable Price, Fast Delivery.
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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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