U842B
Overview
The U842B circuit is designed as an interval and wipe/ wash timer for automotive wiper control. The interval pause can be set in a range from 3 s to 11 s by an external 1-kW potentiometer.
- Interval input: low side
- Wipe/ wash input: low side
- Park input: high side (park position)
- Output driver protected against short circuit
- All time periods determined by RC oscillator
- Fixed relay activation time of 500 ms
- Adjustable interval pause from 3 s to 11 s
- Fixed pre-wash delay of 400 ms
- Dry wiping - With park switch signal: 3 cycles - Without park switch signal: 2.8 s
- Inputs INT, WASH and PARK digitally debounced
