U642B

TELEFUNKEN Semiconductors

Rev. A1, 13-Feb-97

2 (6)

Pin Configuration

Pin

Symbol

Function

1

GND

Ground

2

Input 1

Interval switch

3

4

Afterwiping time resistance

5

WIWA

Wipe/Wash switch

6

Park switch for wiper motor

7

RELAY

Relay control output

8

Supply voltage KI. 15

RELAY

WIWA

GND

Input 1

1

2

3

4

8

7

6

5

U642B

93 7691

Figure 2. Pinning

Circuit Description

Interval Function, Pin 2

switched-OFF. As soon as there is a positive potential at

relay is in OFF position – interval pause begins – the

till the voltage at Pin 3 is below the threshold of 2 V.

Interval pause can be adjusted between 4 s to 20 s with the

sources C and F are switched-OFF.

Wipe/Wash (WIWA) Operation, Pin 5

screen, the current source A is switched-OFF which keeps

charged through the current sources D and F, and when af-

ter a time interval of approximately 100 ms, the voltage

at the capacitor is greater than 6.5 V, the relay is turned

on as long as the switch ”WIWA” is closed.

The after-wipe-time begins after the switch is open

whereas the sources D and F are switched OFF and the

source E is activated. Source E discharges the capacitor

till the voltage is less than 2.2 V. The relay is OFF and the

wiper-motor is switched OFF. The after-wipe-time is

determined by the current source E which can be

source A discharges the capacitor. Relay switch OFF is

Interval and WIWA Functions

The interval function is interrupted immediately when the

function starts.

Interval wiping starts immediately when the after-wipe-

time is over. The switching delays are slightly shorter,

because the capacitor is already charged to a value of 2 V.

The Wipe/Wash function is not interrupted when interval

WIWA function is over.