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U840B

TEMIC Semiconductors
Part Number U840B
Manufacturer TEMIC Semiconductors
Description Digital / Wipe-Wash Control
Published Dec 3, 2007
Detailed Description www.DataSheet4U.com U840B Digital / Wipe-Wash Control for Rear or Front Wiper Description The circuits U840B (DIP8) and...
Datasheet PDF File U840B PDF File

U840B
U840B

Overview
www.
DataSheet4U.
com U840B Digital / Wipe-Wash Control for Rear or Front Wiper 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.
The wipe/ wash (WIWA) mode has priority over the interval mode.
The program Pin PP controls, whether the wiper immediatly starts to wipe, or with a delay time t4 of 0.
8 s.
The inputs CP and INT are digital debounced, the turn-on as well as the turn-off.
The integrated relay driver is protected against short circuits and is switched to conductive condition in the case of a load-dump.
The circuit is protected with the recommended external circuitry against load-dump and RF interference, refer to ISO 7637–1/3 (DIN 40839).
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 inputs with integrated RF protection D Load-dump protected and interference protection according to ISO 7637–1/3 (DIN 40839) Ordering Information Extended Type Number U840B U840B-FP Package DIP8 SO8 Remarks Pin Description Pin 1 2 3 4 5 6 7 8 Symbol INT CO RO PP WASH VS GND OUT Function Interval input C oscillator R oscillator Program pin Wash signal Supply voltage Ground Output INT 1 8 OUT CO RO 2 7 GND U840B 3 6 Vs WASH 13299 PP 4 5 Figure 4.
Pinning TELEFUNKEN Semiconductors Rev.
A2, 03-Feb-97 1 (8) www.
DataSheet4U.
com U840B Block Diagram VS GND CP– c...


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