U642B データシートの表示（PDF） - Temic Semiconductors
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U642B Datasheet PDF : 6 Pages
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U642B
Pin Configuration
Pin Symbol
Function
1
GND Ground
2 Input 1 Interval switch
3
tc
Timing capacitor C2
4
R4 Afterwiping time resistance
5 WIWA Wipe/Wash switch
6
S1 Park switch for wiper motor
7 RELAY Relay control output
8
+VBatt Supply voltage KI. 15
Circuit Description
Interval Function, Pin 2
By closing the internal switch, S2, to supply voltage,
+VBatt, the motor is activated. The internal current source
(Pin 3) which holds the capacitor C2 in charged state is
switched-OFF. As soon as there is a positive potential at
the park switch (S1), current source F (see figure 1)
charges the capacitor C2 very fast. After the wiper
operation is finished, S1 is again at ground potential, the
relay is in OFF position – interval pause begins – the
capacitor C2 is discharged through the current source C,
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
help of potentiometer R3. Now the relay switches ON and
the next interval cycle begins. Opening switch S2 causes
current source A to discharge C2 immediately and current
sources C and F are switched-OFF.
Wipe/Wash (WIWA) Operation, Pin 5
By closing the WIWA-switch, S3, to supply voltage,
+VBatt, water pump starts spraying the water on the wind-
screen, the current source A is switched-OFF which keeps
the capacitor C2 in discharged state. Now the capacitor is
charged through the current sources D and F, and when af-
ter a time interval of approximately 100 ms, the voltage
GND 1
8 +VBatt
Input 1 2
tc
3
U642B
7 RELAY
6 S1
R4 4
5 WIWA
93 7691
Figure 2. Pinning
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
regulated with the external resistor RTime. Afterwards the
source A discharges the capacitor. Relay switch OFF is
independent of the park switch S1.
Interval and WIWA Functions
The interval function is interrupted immediately when the
switch S2 is activated. The current source A discharges
the capacitor to a value of 2 V, afterwards the normal S2
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
switch S2 is activated. Interval function begins after the
WIWA function is over.
2 (6)
TELEFUNKEN Semiconductors
Rev. A1, 13-Feb-97
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