U840B
Overview
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.
- Interval-switch A and B to GND
- Wipe/ wash push button to VBatt
- Output driver protected against short circuit digital debounced: t6 = 10 ms
- All time periods digital determined by RC-oscillator
- Turn-on time of relay t2 = 375 ms
- Adjustable interval pause, t3 = 0.8 to 22 s
- Dry wiping time t5 = 3.7 s
- Program Pin PP determines turn-on delay t4 during wipe-wash mode PP to GND: t4 = 0.8 s PP to VS: t4 = 0 s Interval mode: t4 = 0 s
- Inputs CP and INT digital debounced, t1 = 100 ms
- All inputs with integrated RF protection
