U840B - Digital / Wipe-Wash Control
The circuits U840B (DIP8) and U840B-FP (SO8) are designed as interval wipe/ wash timer for automotive applications.
The interval pause t3 can be set in a range from 0.8 s to 22 s by an external 30 kW potentiometer.
All other time periods are determined by the basic frequency f0 of the oscillator.
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U840B Features
* D Interval-switch A and B to GND D Wipe/ wash push button to VBatt D Output driver protected against short circuit digital debounced: t6 = 10 ms D All time periods digital determined by RC-oscillator D Turn-on time of relay t2 = 375 ms D Adjustable interval pause, t3 = 0.8 to 22 s D Dry wiping time
