U642B-FP ATMEL Corporation, U642B-FP Datasheet - Page 2

• Manufacturer Part Number: U642B-FP
• Description: Interval- and Wipe/ Wash Wiper Control IC
• Manufacturer: ATMEL Corporation

Ordering Information
Pin Description
Circuit Description
Interval Function, Pin 2
By closing the interval switch, S
V
(Pin 3) which holds the capacitor C
switched-off. As soon as there is a positive potential at the
park switch (S
charges the capacitor C
operation is finished, S
relay is in ”off” position – interval pause begins – the
capacitor 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 R
the next interval cycle begins. Opening of switch S
causes the current source A to discharge C
and current sources C and F are switched-off.
Wipe/Wash (WIWA) Operation, Pin 5
By closing the WIWA-switch, S
V
screen, the current source A is switched-off which keeps
the capacitor C
charged through the current sources D and F, and when af-
ter a time interval of approximately 100 ms, the voltage
U642B
2 (7)
Batt
Batt
Pin
1
2
3
4
5
6
7
8
, the relay is activated. The internal current source
, the water pump starts spraying water on the wind-
Extended Type Number
Symbol
WASH
PARK
2
U642B–FP
GND
OUT
INT
V
is discharged through the current source C,
C
R
U642B
S
t
t
2
1
), the current source F (see figure 1)
in discharged state. Now the capacitor is
Ground
Interval switch
Timing capacitor C
Afterwiping time resistance
Wipe/Wash switch
Park switch for wiper motor
Relay control output
Supply voltage KI. 15
1
3
. Now the relay switches on and
is again at ground potential, the
2
very fast. After the wiper
Function
3
2
, to supply voltage,
, to supply voltage,
2
in charged state is
2
2
immediately
Package
DIP8
SO8
2
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 supplied via the park switch until the park
position will be reached. The after-wipe-time is
determined by the current source E which can be
regulated with the external resistor R
source A discharges the capacitor. The relay switch off is
independent of the park switch S
Interval and WIWA Functions
The interval function is interrupted immediately when the
wipe/ wash mode is activated. The current source A dis-
charges the capacitor to a value of 2 V, afterwards the
normal wash 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 S
WIWA function is over.
2
GND
is activated. Interval function begins after the
INT
C
R
t
t
1
3
4
2
Figure 2. Pinning
U642B
Remarks
93 7691
1
.
8
7
6
5
Time
Rev. A4, 10-Apr-01
V
OUT
PARK
WASH
. Afterwards the
S