IK642B

TECHNICAL DATA
INTERVAL- and WIPE/WASH WIPER CONTROL IC
IK642B
The IK642B is a bi-polar integrated circuit designed for the
wiper application in the automotive market. It includes wipe, wash
and internal mode.
SO8
FEATURES
 Interval Pause: 4 to 20 s
 After-wiping Time: 2 to 20 s
 Wiper Motor's Park Switch
 Wipe/Wash Mode Priority
 One External Capacitor Determines All Time Sequences
 Relay Driver with Z-diode
 Load-dump Protected
 Prewash Delay 300mS
 Interference Protection According to VDE 0839 or ISO/TR 7637/1
DIP8
ORDERING INFORMATION
Device
Operating
Temperature Range
IK642BN
IK642BDT
ТА = -40 to +85 С
IK642BD
Package
Packing
DIP8
Tube
SO8
Tape & Reel
SO8
Tube
FUNCTIONAL DESCRIPTION
As a convenience feature of the windshield wiper, intermittent and wipe/wash
operation functions are implemented in most of the automobiles. The IK642B is a costeffective solution for an accurate timing function control. Wipe/wash mode has priority over
interval mode. Interval pause and after-wiping time can be set to fixed values by using
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 IK642B.
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2013 June, Ver. 00
IK642B
BLOCK DIAGRAM
Figure 1
PIN CONFIGURATION
Figure 2
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2013 June, Ver. 00
IK642B
PIN DESCRIPTION
Pin No.
Symbol
Description
1
GND
2
INT
Interval switch
3
CT
Timing capacitor C2
4
RT
After-wiping time resistance
5
WASH
Wipe/wash switch
6
PARK
Park switch for wiper motor
7
OUT
8
VS
Ground
Relay control output
Supply voltage terminal 15
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2013 June, Ver. 00
IK642B
CIRCUIT DESCRIPTION
Interval Function, Pin 2
By closing the interval switch, S2, to supply voltage, VBatt, the relay is activated. The internal
current source (pin 3) which holds the capacitor C2 in a charged state is switched-off. As soon as
there is a positive potential at the park switch (S1), the current source F (see Figure 1 on page 1)
charges the capacitor C2 very quickly. After the wiper operation is finished, S1 is again at ground
potential, the relay is in the 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 of switch S2 causes the 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, the water pump starts spraying water
on the windshield. During this function, the current source A is switched-off which keeps the
capacitor C2 in a discharged state. Now the capacitor is charged through the current sources D and
F. If (after 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-wiping time begins when the switch is open, the sources D and F are switched off
and the source E is activated. Source E discharges the capacitor until 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 is reached.
The after-wiping time is determined by the current source E which can be regulated with the
external resistor RTime. When the after-wiping time has elapsed, the source A discharges the
capacitor. The relay switch is independent of the park switch S1.
Interval and WIWA
Functions
The interval function is interrupted immediately when the wipe/wash mode is activated. The
current source A discharges 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 the interval switch S2 is activated.
The interval function begins after the WIWA function has elapsed.
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2013 June, Ver. 00
IK642B
Figure 3. Application Circuit with Interval and Wipe/Wash Operation
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IK642B
ABSOLUTE MAXIMUM RATINGS
Parameters
Pin
Symbol
Value
Unit
Supply voltage t = 60 s, terminal 15
8
VBatt
28
V
Supply current
t = 2 ms
t = 200 ms
8
I8
I8
1.5
150
A
mA
Relay control output current (DC)
t = 200 ms
7
I7
I7
200
1.2
mA
A
6
5
2
I6
I5
I2
50
50
50
mA
Power dissipation Tamb = 90°C
Ptot
500
mW
Storage temperature range
Tstg
-55 to +125
°C
Ambient temperature range
Tamb
-40 to +85
°C
Symbol
Value
Unit
DIP8
RthJA
120
K/W
SO8
RthJA
160
K/W
Pulse Current (Control Inputs) t = 200 ms
Park switch, S1
Wipe/Wash switch, S3
Interval switch, S2
THERMAL RESISTANCE
Parameter
Junction ambient
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the
device. This is a stress rating only and functional operation of the device at these or any other conditions
beyond those indicated in the operational sections of this specification are not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
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2013 June, Ver. 00
IK642B
ELECTRICAL CHARACTERISTICS
VBatt = 12V, Tamb = 25°C, reference point is pin 8 (see Figure 3 on page 4) unless otherwise specified.
Parameter
Test Conditions
Pin
Symbol
Min
VBatt
9
Supply voltage
Supply current
8
Typ.
Max
Unit
16.5
V
I8
10
mA
V1
7.6
V
Threshold current
I1
-50
mA
Threshold voltage
VBatt
35
V
Z-diode limitation
Overvoltage
Relay Control Output
Saturation voltage
7
I7 = 100 mA
I7 = 200 mA
Leakage current
Park Switch
Input Ct
WASH Input
R2 = 2.7 to 30 kΩ
Switching
Characteristics
Interval time
I2 = –10 mA
I2 = 30 mA/10 ms
R5 = 10 kΩ
uA
R6
50
kΩ
V6
–3.3
V
V6
V6
–0.8
7.6
V
R3
100
Ω
V2
–0.8
7.6
V
5
–1.4/
–5.4
–0.8
7.6
V5
I5 = –10 mA
I5 = 10 mA
V
V
V
R4 = 47 kΩ to 300 kΩ, I4 = –150 μA
R3 = 0 kΩ
R3 = 10 kΩ
t2
Prewash delay
After-wipe-time
100
2
Switching threshold/
Hysteresis
Protection diode
I7
3
Internal resistance
Protection diode
V
6
Internal pull-up
R6 = 10 kΩ
resistance
Switching threshold
voltage
I6 = –10 mA
Protection diode
I6 = 10 mA
Interval Input
-1.0
-1.5
V7
3.6
10.8
tdel
R4 = 130 kΩ
5
t5
7
4
12
4.4
13.2
300
4.75
5.25
s
ms
5.75
s
2013 June, Ver. 00
IK642B
DIAGRAMS
Figure 4. Interval Pause = f (T); Ct = 22 μF
Figure 5. After-wiping Time = f (T); Ct = 22 μF; VBatt = 8 V
Figure 6. Interval Pause = f (RINT); Ct = 22 μF
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2013 June, Ver. 00
IK642B
Figure 7. After-wiping Time = f (T); Ct = 22 μF; VBatt = 16 V
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2013 June, Ver. 00
IK642B
PACKAGE DIMENSION
N SUFFIX PLASTIC DIP
(MS – 001BA)
A
Dimension, mm
5
8
B
1
4
F
Symbol
MIN
MAX
A
8.51
10.16
B
6.1
7.11
C
L
C
5.33
D
0.36
0.56
F
1.14
1.78
-T- SEATING
PLANE
N
G
K
D
0.25 (0.010) M
M
J
H
T
NOTES:
1. Dimensions “A”, “B” do not include mold flash or protrusions.
Maximum mold flash or protrusions 0.25 mm (0.010) per side.
10
G
2.54
H
7.62
J
0°
10°
K
2.92
3.81
L
7.62
8.26
M
0.2
0.36
N
0.38
2013 June, Ver. 00
NOTES:
1. Dimensions “A”, “B” do not include mold flash or protrusions.
Maximum mold flash or protrusions 0.25 mm (0.010) per side.
K
2.92
3.81
L
7.62
8.26
M
0.2
0.36
N
0.38
IK642B
D SUFFIX SOIC
(MS - 012AA)
Dimension, mm
A
8
5
B
H
1
G
P
4
D
K
MIN
MAX
A
4.8
5
B
3.8
4
C
1.35
1.75
D
0.33
0.51
F
0.4
1.27
R x 45
C
-T-
Symbol
SEATING
PLANE
J
F
0.25 (0.010) M T C M
NOTES:
1. Dimensions A and B do not include mold flash or protrusion.
2. Maximum mold flash or protrusion 0.15 mm (0.006) per side
for A; for B ‑ 0.25 mm (0.010) per side.
11
M
G
1.27
H
5.72
J
0°
8°
K
0.1
0.25
M
0.19
0.25
P
5.8
6.2
R
0.25
0.5
2013 June, Ver. 00