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TEMIC Semiconductors - Wiper Control for Intermittent and Wipe/ Wash Mode

Numéro de référence U842B
Description Wiper Control for Intermittent and Wipe/ Wash Mode
Fabricant TEMIC Semiconductors 
Logo TEMIC Semiconductors 





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U842B fiche technique
U842B
Wiper Control for Intermittent and Wipe/ Wash Mode
Description
The U842B circuit is designed as an interval and
wipe/ wash timer for automotive wiper control. The
Winterval pause can be set in a range from 3 s to 11 s by an
external 1-k potentiometer. Wipe/wash mode has
priority over the interval mode. The U842B controls the
wiper motor with/without park switch signal.
The integrated relay driver is protected against short
circuits and is switched to conductive condition in the
case of a load-dump. With only a few external
components, protection against RF interference and
transients (ISO/TR 7637-1/3) can be achieved.
Features
D Interval input: low side
D Wipe/ wash input: low side
D Park input: high side (park position)
D Output driver protected against short circuit
D All time periods determined by RC oscillator
D Fixed relay activation time of 500 ms
D Adjustable interval pause from 3 s to 11 s
D Fixed pre-wash delay of 400 ms
D Dry wiping
– With park switch signal: 3 cycles
– Without park switch signal: 2.8 s
D Inputs INT, WASH and PARK digitally debounced
D All inputs with integrated RF protection
D Load-dump protection and interference protection ac-
cording to ISO 7637-1/3 (DIN 40839)
Application
Digital/ wipe-wash control for rear or front wiper
Ordring Information
Extended Type Number
U842B
U842B–FP
Package
DIP8
SO8
Remarks
Pin Description
Pin Symbol
Function
1 INT Interval input
2 WASH Wipe/ wash input
3 PARK Park switch input
4 PAUS Pause time adjust
5 OSC Oscillator input
6 VS Supply voltage
7 GND Ground
8 OUT Relay output
INT 1
8 OUT
WASH 2
PARK 3
U842B
7 GND
6 Vs
PAUS 4
5 OSC
Figure 1. Pinning
13300
TELEFUNKEN Semiconductors
Rev. A2, 03-Feb-97
1 (12)

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