U2642B [TEMIC]
Intermittent- and Wipe/Wash Control for Wiper Systems; 间歇式和擦拭/清洗控制雨刮系统
| 型号： | U2642B |
| 厂家： | 
TEMIC SEMICONDUCTORS |
| 描述： | Intermittent- and Wipe/Wash Control for Wiper Systems |
| 文件： | 总10页 (文件大小：171K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
U2642B
Intermittent- and Wipe/Wash Control for Wiper Systems
Description
With the U264xB, TEMIC Semiconductors developed a generate ”x” versions using different metallization
family of intermittent- and wipe/wash control circuits for masks. Thus, it is easy to verify a broad range of time se-
windshield or backlite wiper systems with identical basic quences which can be set independently of each other.
functions. The circuit design provides the possibility to
Features
Relay activation can be controlled by a limit switch of
the wiper motor or by a fixed activation period for
systems without limit switch
Relay activation:
Interval pause:
After wiping:
0.64 s
10 s
5.8 s
0.91 s
Debounced input stages
Pre-wash delay:
Enable/disable of pre-wash delay by program pin
Wipe/wash mode with priority
Polarity of WIWA:
Polarity of INT:
V
V
Batt
Batt
Protected in accordance to ISO/TR 7637–1
EMC with intergrated filters
Relay output is protected with a clamping diode
Ordering Information
Extended Type Number
U2642B
Package
DIP8
SO8
Remarks
U2642B–FP
Block Diagram
V
OSC
S
Voltage
stabilization
and
Oscillator
POR
INT
21 V
Open-collector
relay driver
Load-
dump
detection
and
output
control
WIWA
LS
REL
21 V
21 V
21 V
Input
comparator
21 V
Logic
PP
13944
GND
Figure 1.
TELEFUNKEN Semiconductors
1 (10)
Rev. A2, 02-Dec-97
U2642B
Pin Configuration
Pin
1
Symbol
INT
Function
Intermittent input
INT
WIWA
LS
1
2
8
OSC
2
WIWA Wipe/wash (WIWA) input
V
S
7
6
3
LS
PP
Limit switch (wiper motor) input
Program pin
4
REL
3
4
5
GND
REL
Ground
6
Relay output
GND
PP
5
7
V
S
Supply voltage
8
OSC
RC oscillator input
13365
Figure 2. Pinning
Functional Description
All times specified below refer to an oscillator frequency
of 200 Hz. Figures 2 to 9 show the dependencies of the
times upon battery voltage and temperature. The
temperature dependence of the oscillator frequency is
essentially determined by the temperature coefficient of
the oscillator capacitor. The temperature dependence of
the oscillator frequency can be reduced to minimum with
a slightly negative temperature coefficient (N100). The
capacitor used in figures 10 and 11 has a slightly positive
temperatur coefficient.
Interval Pause
The interval pause t
switch INT causes a debounce time, t , and reclosing
results in the relay on-time, t , after t .
= 10 s follows t . Opening of
ON
INT
D
ON
D
Wipe/Wash Function without Pre-Wash
Delay (PP connected to GND)
The water pump is switched on when the switch WIWA
is pressed and, after the debounce time, t , the relay is
D
energized. After-wiping time t
switch WIWA is opened and the debounce time, t , has
expired. If the limit switch is connected, the relay remains
energized until the wiper arm returns to park position, i.e.,
the motor current flows via the relay contact only.
= 5.8 s starts as soon as
AW
All times are permanently set and can be changed only
jointly within certain limits by adjusting the oscillator
frequency. See table 1.
D
Intermittent Function
Wipe/Wash Function with Pre-Wash Delay
(PP connected to VS)
The relay is energized for the time t
after the switch
ON
INT is switched on with respect to V
and after
Batt
In wipe/wash mode, the relay is energized after a delay
time. The water pump can spray water onto the wind-
expiration of time t (debounce).
D
screen during the delay time, t
.
The debounce time ranges between 60 ms and 80 ms. A
time period of 5 ms to 40 ms for internal sequence control
must be added (asynchronism between operating instant
and internal clock) e.g., the response time may range from
65 ms up to 120 ms.
DEL
The on-delay time of the U2641B is:
= t + 0.84 s = 0.91 s
t
DEL
D
If switch WIWA is closed longer than t but shorter than
D
t
t
t
, the after-wiping time, t , starts after expiration of
. The wipe/wash function with or without on-delay
can be selected by programming PP.
DEL
DEL
DEL
AW
If the limit switch of the windscreen wiper motor is
connected to Pin LS, the relay is energized as long as the
switch is at high potential, regardless of the relay on-time,
t
, i.e., the motor current in interval mode flows via the
PP connected to GND:
PP connected to V :
without pre-wash delay
with pre-wash delay
ON
relay contact only. In park position, the motor winding at
both ends is connected to ground via the limit switch and
the motor is decelerated immediately. The limit switch
S
The after-wiping time, t , is re-triggerable in both cases.
AW
input is debounced with t = 17 ms.
DL
Intermittent and Wipe/Wash Mode
The relay on-time, t , always elapsed – even if the The wipe/wash function has priority over the interval
ON
interval switch was opened beforehand.
function. If switch WIWA is closed during the interval
2 (10)
TELEFUNKEN Semiconductors
Rev. A2, 02-Dec-97
U2642B
function, wipe/wash mode is activated immediately after
the debounce time, t , even if an on-delay is programmed
Power Supply
D
For reasons related to protection against interference and
destruction, the Pin V must be provided with an RC net-
work for limiting the current in the event of overvoltage
and for buffering in the event of voltage drops.
(t
= 0 s). Expiry of t is directly followed by the next
DEL
AW
S
relay on-time, t , of intermittent mode.
ON
Oscillator
Proposed ratings: R = 510 , C = 47 F. An integrated
V
V
All timing sequences are derived from an RC-oscillator
14-V Zener diode is connected between V and GND.
S
whose charging time, t , is determined by an external
1
resistor R
and whose discharging time, t is Interference Voltages and Load-Dump
OSC
2,
determinated by an integrated 2-k resistor. Since
tolerance and temperature response of the integrated
resistor are far higher than those of the external resistor,
In the case of transients, the integrated Zener diode limits
the voltage of the relay output to approximately 28 V. In
the case of load-dump, a current (dependent upon R and
V
t /t must be selected to be greater than 20 for stability
1 2
C ) flows through the integrated 14-V Zener diode, and
V
reasons. The minimum value of R
than 68 k .
should not be less
OSC
the relay output is switched on at V
> 30 V in order to
Batt
avoid destruction of the output. The output transistor is
rated such that it can withstand the current generated dur-
ing the load-dump through the relay coil. In practice, the
windscreen wiper motor is switched on via the relay and
thus the amplitude of the load-dump pulse is limited. The
supply voltage of the circuit is limited to 14 V by the inte-
grated Zener diode, and the inputs are protected by
external protective resistors and integrated Zener diodes.
Calculating cycle duration and frequency:
t = t + t = C
( 0.74
R + 2260
OSC
)
1
2
OSC
and
f
= 1/t
OSC
Calculating the capacitor for a given resistor:
= t / ( 0.74 + 2260
C
OSC
R
OSC
)
RF suppression is implemented with a low-pass filter at
the inputs, consisting of a protective resistor and the inte-
grated capacitor.
Calculating the oscillator resistance for a given capacitor:
= 1.34 ( t / C – 2260
R
OSC
)
OSC
Recommended frequency: f
= 200 Hz
OSC
Power-on Reset (POR)
(for R
= 200 k , C
= 33 nF)
OSC
OSC
When the supply voltage is applied, a power-on reset
All times can be varied jointly within specific limits by pulse is generated which sets the circuit’s logic to a de-
varying the oscillator frequency (see table 1). The oscilla- fined initial state. The POR threshold is approximately
tor is operable up to 50 Hz.
V = 4.3 V.
S
Table 1. Change in times by varying the oscillator frquency
fosc (Hz)
100
120
140
160
180
200
220
240
260
280
300
400
tD [ms]
140
116
100
87
tDL [ms]
35
tON [ms]
tINT [s]
20.0
17.0
14.0
12.5
11.0
10.0
9.0
tAW [s]
11.6
9.6
tDEL [s]
1680
1400
1200
1050
933
1280
1066
915
800
710
640
581
533
493
457
426
320
29
25
8.3
22
7.2
77
19
6.4
70
17
5.8
840
64
16
5.3
763
58
14
8.2
4.8
700
54
13
7.6
4.5
645
50
12
7.0
4.1
600
46
11
6.5
3.9
560
35
9
5.0
2.9
420
TELEFUNKEN Semiconductors
3 (10)
Rev. A2, 02-Dec-97
U2642B
Absolute Maximum Ratings
With recommended external circuitry
Parameter
Supply voltage (static)
Supply current pulse
Test Conditions
Symbol
Value
24
Unit
V
5 min
2 ms
V
Batt
I
I
1.5
A
S
S
Supply current pulse
300 ms
150
mA
mA
A
Relay output current (static)
Relay output current pulse
Ambient temperature range
Storage temperature range
Power dissipation
I
I
300
REL
REL
300 ms
1.5
T
amb
–40 to +95
–55 to +125
0.45
°C
°C
W
T
stg
DIP8
SO8
P
tot
tot
Power dissipation
P
0.34
W
Thermal Resistance
Parameters
Symbol
Value
120
160
Unit
K/W
K/W
Junction ambient
Junction ambient
DIP8
SO8
R
thJA
R
thJA
Electrical Characteristics
Reference point Ground GND, T
= 25 C, V
= 13.5 V, unless otherwise specified (see figures 11 and 12)
amb
Batt
Parameters
Voltage supply
Supply voltage
Supply current
Undervoltage threshold
(POR)
Test Conditions / Pin
Symbol
Min
Typ
2.0
Max
Unit
Pin 7
V
Batt
6.0
0.5
3.0
16.0
3.0
5.1
V
mA
V
I
S
V
S
Internal Z-diode
Internal capacitor
V
C
13.5
14.0
15
16.2
V
pF
Z
S
Series resistance
Filter capacitor
R
510
47
V
C
V
F
Oscillator input OSC
Internal discharge resistor
Pin 8
R
DIS
1.3
2.0
3.2
k
Lower switching-point
voltage
Upper switching-point
voltage
V
0.16
0.55
V
V
0.20
V
V
0.24
V
V
V
OSC
S
S
S
V
OSC
0.60
0.65
V
S
S
S
Input current
V
OSC
= 0 V
–I
2
A
OSC
Oscillator frequency
Input limit switch LS
f
1
200
50 k
Hz
OSC
Pin 3
Internal protection-diode
voltage
Internal capacitor
Switching threshold
voltage
I
= 10 mA
V
19.5
21.0
25
25.5
V
LS
LS
C
LS
pF
V
0.375 VS 0.5 VS 0.675 VS
V
LS
Input current
Internal pull-up resistor
External protection resistor
V
LS
= V
I
R
R
1
27
A
k
k
S
LS
13
10
20
LS
S
4 (10)
TELEFUNKEN Semiconductors
Rev. A2, 02-Dec-97
U2642B
Parameters
Test Conditions / Pin
Symbol
Min
19.5
Typ
Max
Unit
Inputs INT, WIWA and PP
Internal protection-diode
voltage
Internal capacitor
Switching threshold
voltage
Pins 1, 2 and 4
I = 10 mA
V
E
21.0
25
25.5
V
E
C
E
pF
V
0.375 VS 0.5 VS 0.675 VS
V
E
Input current
V = 0 V
E
–I
R
R
1
27
A
k
k
E
E
S
Internal pull-down resistor
External protection resistor
Relay Output
13
10
20
Pins 6
Saturation voltage
Saturation voltage
Z-diode clamp voltage
Leakage current
Relay coil resistance
I = 100 mA
I = 200 mA
I = 10 mA
V = 14 V
V
V
V
1.1
1.5
25.5
12
V
V
V
A
REL
REL
REL
REL
19.5
21.0
33
I
R
REL
60
28
Load-dump protection
threshold
V
42
V
Batt
Internal pulse times
Debouncing period inputs
Debouncing period inputs
Relay activation time
Intermittent pause
INT/WIWA 12 - 16 clocks
t
60
15
70
80
20
ms
ms
ms
s
D
LS
3 – 4 clocks
96 clocks
t
17.5
480
5.92
DL
ON
t
t
INT
After wiping period
Pre-wash delay reaction
1024 68 clocks
88 – 96 clocks
t
4.78
440
5.46
480
s
ms
WIWA
t
DEL
time for switch-on delay =
t
+ t
DEL
D
Note: All internally generated time sequences are derived from the oscillator frquency. The tolerances refer to a
frequency adjusted to f = 200 Hz.
OSC
TELEFUNKEN Semiconductors
5 (10)
Rev. A2, 02-Dec-97
U2642B
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
10
9
8
7
6
5
4
3
2
1
0
max
min
6
8
10
12
14
16
18
6
8
10
12
14
16
18
V
(V)
V
(V)
Batt
Batt
Figure 3. Relay activation = f (VBatt
)
Figure 5. After-wipe time = f (VBatt)
14
13
12
11
10
9
8
7
6
5
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
max
min
4
3
2
1
0
6
8
10
12
14
16
18
6
8
10
12
14
16
18
V
(V)
V
(V)
Batt
Batt
Figure 4. Interval pause = f (VBatt
)
Figure 6. Pre-wash delay = f (VBatt)
6 (10)
TELEFUNKEN Semiconductors
Rev. A2, 02-Dec-97
U2642B
0.8
0.7
0.6
0.5
0.4
0.3
0.2
8
7
6
5
4
3
2
1
0
max
min
–40 –20
0
20
40
60
80 100
–40 –20
0
20
40
60
80 100
Temperature (°C )
Temperature (°C )
Figure 7. Relay activation = f (Temperature)
1.2
Figure 9. After-wipe time = f (Temperature)
12
10
8
max
1.0
min
0.8
6
0.6
0.4
0.2
4
2
0
–40 –20
0
20
40
60
80 100
–40 –20
0
20
40
60
80 100
Temperature (°C )
Temperature (°C )
Figure 8. Pre-wash delay = f (Temperature)
Figure 10. Interval pause = f (Temperature)
Note: The temperature characteristic is caused by the temperature coefficient T of the external capacitor
C
TELEFUNKEN Semiconductors
7 (10)
Rev. A2, 02-Dec-97
U2642B
Application Examples
Kl 15
Rv
510 Ω
Rosc
200 kΩ
CV
Cosc
8
6
5
7
47 µF 33 nF
U2642B
1
2
3
4
Rs
Rs
INT
10 kΩ
10 kΩ
WIWA
Water–
pump
Wiper–
motor
M
M
13907
Figure 11. Application without limit switch
Kl 15
Rv
510 Ω
Rosc
200 kΩ
CV
Cosc
8
6
5
7
47 µF 33 nF
U2642B
1
2
3
4
Rs
10 kΩ
Rs
10 kΩ
INT
Rs
10 kΩ
WIWA
Water–
pump
Wiper–
motor
Limit–
switch
M
M
13908
Figure 12. Application with limit switch
8 (10)
TELEFUNKEN Semiconductors
Rev. A2, 02-Dec-97
U2642B
Package Information
Package DIP8
Dimensions in mm
9.8
9.5
7.77
7.47
1.64
1.44
4.8 max
3.3
6.4 max
0.5 min
0.36 max
0.58
0.48
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
3.7
4.85
1.4
0.2
0.25
0.10
0.4
3.8
1.27
6.15
5.85
3.81
8
5
technical drawings
according to DIN
specifications
13034
8
5
TELEFUNKEN Semiconductors
9 (10)
Rev. A2, 02-Dec-97
U2642B
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
10 (10)
TELEFUNKEN Semiconductors
Rev. A2, 02-Dec-97
相关型号：
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