TEMIC U642B

U642B
Automotive Wipe/Wash or Interval Switch
Description
As a convenience feature of the windshield wiper intermittent and wipe/wash operation are implemented in
most of the automobiles. The U642B controls all timing
functions accurately at a reasonable price level. Interval
pause and afterwiping time can be set to fixed values with
the help of resistors in a broad time range. Added value
can be provided with an individual, continuous adjustment of the interval pause by a potentiometer which may
be built into the stalk. For proper operation it is mandatory
to feed the signal of the wiper motor‘s park switch into
U642B.
Features
D Interval pause: 4 to 20 s
D One external capacitor, determines all time sequences
D Relay driver with Z-diode
D Interference protection according to VDE 0839 or
D Afterwiping time: 2 to 20 s
D Wiper motor’s park switch
ISO/TR 7637/1
D Load-dump protected
D Wipe/wash mode priority
Ordering Information
Extended Type Number
U642B
U642B–FP
Package
DIP8
SO8
Remarks
Block Diagram
VS
8
S1
6
Relay control
7
WI WA
5
VRef
VRef
Park switch
comparator
Load-dump
comparator
Input
comparator
VRef
Logic
Wipe / wash
comparator
VRef
Interval
comparator
1
GND
A
B
2
Interval switch
C
D
3
Timing (C2)
E
F
4
Timing (R)
94 8950
Figure 1. Block diagram
TELEFUNKEN Semiconductors
Rev. A1, 13-Feb-97
1 (6)
U642B
Pin Configuration
Pin
1
2
3
4
5
6
7
8
Symbol
GND
Input 1
tc
R4
WIWA
S1
RELAY
+VBatt
Function
Ground
Interval switch
Timing capacitor C2
Afterwiping time resistance
Wipe/Wash switch
Park switch for wiper motor
Relay control output
Supply voltage KI. 15
GND
1
8
+VBatt
Input 1
2
7
RELAY
tc
3
6
S1
R4
4
5
WIWA
U642B
93 7691
Figure 2. Pinning
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 windscreen, 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 after a time interval of approximately 100 ms, the voltage
2 (6)
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-wipetime 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.
TELEFUNKEN Semiconductors
Rev. A1, 13-Feb-97
U642B
10 kW
47 mF
10 V
C
10 kW
5
5
U642B
C
R
2
2
1
22 mF
10 V
R
4
Rtime = 130 kW
510 W
R
S
1
4
3
2
2.7 kW
S
R
1
1
R
6
6
7
8
Relay
R
3
10 k W
2
WIWA
Park
switch
M
M
S
3
31
Wiper motor
15
Interval switch
Water pump
94 8951
Figure 3. Application circuit with interval and wipe/wash operation
Absolute Maximum Ratings
Parameters
Supply voltage
t = 60 s
Terminal 15,
Supply current
t = 2 ms
t = 200 ms
Relay control output current (DC)
t = 200 ms
Pulse current (control inputs)
t = 200 ms
Park switch, S1
Wipe/Wash switch, S3
Interval switch, S2
Power dissipation Tamb = 90°C
Storage temperature range
Ambient temperature range
TELEFUNKEN Semiconductors
Rev. A1, 13-Feb-97
Pin 8
Pin 8
Pin 7
Pin 6
Pin 5
Pin 2
Symbol
VBatt
I8
I8
I7
I7
Value
28
1.5
150
200
1.2
Unit
V
A
mA
mA
A
I6
I5
I2
Ptot
Tstg
Tamb
50
50
50
500
–55 to +125
–40 to +85
mA
mW
°C
°C
3 (6)
U642B
Thermal Resistance
Parameters
Junction ambient
Symbol
RthJA
RthJA
DIP8
SO8
Value
110
160
Unit
K/W
K/W
Electrical Characteristics
VBatt = 12 V, Tamb = 25°C, (see figure KEIN MERKER) unless otherwise specified.
Parameters
Supply voltage
Supply current
Z-diode limitation
Overvoltage
Threshold current
Threshold voltage
Relay control output
Saturation voltage
Test Conditions / Pins
Pin 8
Symbol
VBatt
I8
V2
I1
VBatt
Typ.
Max.
16.5
10
–7.6
Unit
V
mA
V
–50
35
mA
V
Pin 7
I7 = 100 mA
I7 = 200 mA
V7
Reverse current
I7
Park switch
Pin 6
Internal pull-up resistance
R6 = 10 k
R6
Switching threshold voltage
V6
Protection diode
I6 = –10 mA
V6
V6
I6 = 10 mA
Input C2
Pin 3
Internal resistance
R3
Interval input, R2 = 2.7 to 30 k
Pin 2
Protection diode
I2 = –10 mA
V2
I2 = 30 mA/10 ms
WIWA Input, R5 = 10 k
Pin 5
Switching threshold/
V5
Hysteresis
Protection diode
I5 = –10 mA
V
I5 = 10 mA
Switching Characteristics, R4 = 47 k to 300 k, I4 = –150 A
Interval time
R3 = 0 k
t2
R3 = 10 k
Switch-ON time
ton
After-wipe-time
R4 = 130 k
Pin 5
t5
4 (6)
Min.
9
–1.0
–1.5
–0.1
3.6
10.8
4.75
V
mA
50
–3.3
–0.8
7.6
k
V
V
V
100
–0.8
7.6
V
–1.4/–5.4
V
–0.8
7.6
V
4
12
100
5.25
4.4
13.2
5.75
s
ms
s
TELEFUNKEN Semiconductors
Rev. A1, 13-Feb-97
U642B
Package Information
Package DIP8
Dimensions in mm
7.77
7.47
9.8
9.5
1.64
1.44
4.8 max
6.4 max
0.5 min
0.58
0.48
3.3
0.36 max
9.8
8.2
2.54
7.62
8
5
technical drawings
according to DIN
specifications
13021
1
4
Package SO8
Dimensions in mm
5.2
4.8
5.00
4.85
3.7
1.4
0.25
0.10
0.4
1.27
6.15
5.85
3.81
8
0.2
3.8
5
technical drawings
according to DIN
specifications
13034
8
TELEFUNKEN Semiconductors
Rev. A1, 13-Feb-97
5
5 (6)
U642B
Ozone Depleting Substances Policy Statement
It is the policy of TEMIC TELEFUNKEN microelectronic GmbH to
1. Meet all present and future national and international statutory requirements.
2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems
with respect to their impact on the health and safety of our employees and the public, as well as their impact on
the environment.
It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as
ozone depleting substances ( ODSs).
The Montreal Protocol ( 1987) and its London Amendments ( 1990) intend to severely restrict the use of ODSs and
forbid their use within the next ten years. Various national and international initiatives are pressing for an earlier ban
on these substances.
TEMIC TELEFUNKEN microelectronic GmbH semiconductor division has been able to use its policy of
continuous improvements to eliminate the use of ODSs listed in the following documents.
1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively
2 . Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental
Protection Agency ( EPA) in the USA
3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C ( transitional substances ) respectively.
TEMIC can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain
such substances.
We reserve the right to make changes to improve technical design and may do so without further notice.
Parameters can vary in different applications. All operating parameters must be validated for each customer
application by the customer. Should the buyer use TEMIC products for any unintended or unauthorized
application, the buyer shall indemnify TEMIC against all claims, costs, damages, and expenses, arising out of,
directly or indirectly, any claim of personal damage, injury or death associated with such unintended or
unauthorized use.
TEMIC TELEFUNKEN microelectronic GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany
Telephone: 49 ( 0 ) 7131 67 2831, Fax number: 49 ( 0 ) 7131 67 2423
6 (6)
TELEFUNKEN Semiconductors
Rev. A1, 13-Feb-97