Datasheet Details
| Part number | U840B |
|---|---|
| Manufacturer | TEMIC Semiconductors (now Microchip) |
| File Size | 147.07 KB |
| Description | Digital / Wipe-Wash Control |
| Datasheet |
 U840B Datasheet
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General Description
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.
Key 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 t5 = 3.7 s D 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 D Inputs CP and INT digital debounced, t1 = 100 ms D All.