Description
As a convenience feature of the windshield wiper intermittent and wipe/wash operation are implemented in most of the automobiles. The U642B is the low-cost solution for an accurate timing function control. Wipe/wash mode has priority over interval mode. Interval pause and afterwiping 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 U642B.

FEATUREs
• Interval pause: 4 to 20 s
• Afterwiping time: 2 to 20 s
• Wiper motor’s park switch
• 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