U2640B [ATMEL]
Intemittent- and Wipe/ Wash Control for Wiper Systems; Intemittent-和擦拭/清洗控制雨刮系统
| 型号： | U2640B |
| 厂家： | 
ATMEL |
| 描述： | Intemittent- and Wipe/ Wash Control for Wiper Systems |
| 文件： | 总10页 (文件大小：85K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
U2640B
Intemittent- and Wipe/ Wash Control for Wiper Systems
Description
With the U264xB, Atmel Wireless & Microcontrollers possibility to generate ”x” versions using different metal-
developed a family of intermittent- and wipe/wash con- lization masks. Thus, it is easy to verify a broad range of
trol circuits for windshield or backlite wiper systems with time sequences which can be set independently of each
identical basic functions. The circuit design provides the other.
FD eRaetluayreacstivation can be controlled by a limit switch of
D Relay activation:
D Interval pause:
D After wiping:
0.48 s
5.8 s
the wiper motor or by a fixed activation period for
systems without limit switch
5.2 s
D Debounced input stages
D Pre-wash delay:
0.52 s
D Enable/disable of pre-wash delay by program pin
D Wipe/wash mode with priority
D Protected in accordance to ISO/TR 7637–1
D EMC with intergrated filters
D Polarity of WIWA: V
Batt
D Polarity of INT:
V
Batt
D Relay output is protected with a clamping diode
Block Diagram
V
S
OSC
Voltage
stabilization
and
Oscillator
POR
INT
21 V
Open-collector
relay driver
Load-
dump
WIWA
REL
21 V
Input
detection
and
output
control
21 V
Logic
comparator
LS
21 V
PP
21 V
13944
GND
Figure 1. Block diagram
Ordering Information
Extended Type Number
Package
DIP8
Remarks
U2640B
U2640B–FP
SO8
Rev. A4, 03-Apr-01
1 (10)
U2640B
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
13365
8
OSC
RC oscillator input
Figure 2. Pinning
Functional Description
All times specified below refer to an oscillator frequency
of 200 Hz. Figures 9 to 16 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 .
= 5.8 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
energized. After-wiping time t = 5.2 s starts as soon as
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.
D
All times are permanently set and can be changed only
jointly within certain limits by adjusting the oscillator
frequency. See table 1.
AW
D
Intermittent Function
The relay is energized for the time t
after the switch
and after expira-
ON
Wipe/Wash Function with Pre-Wash Delay
(PP connected to VS)
INT is switched on with respect to V
Batt
tion of time t (debounce).
D
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.
In wipe/wash mode, the relay is energized after a delay
time. The water pump can spray water onto the wind-
screen during the delay time, t
.
DEL
The on-delay time of the U2640B is:
= t + 0.44 s = 0.52 s
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
DEL
D
If switch WIWA is closed longer than t but shorter than
D
t
, i.e., the motor current in interval mode flows via the
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.
ON
DEL
DEL
DEL
AW
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
PP connected to GND:
PP connected to V :
without pre-wash delay
with pre-wash delay
input is debounced with t = 17 ms.
DL
S
The relay on-time, t , always elapses – even if the
ON
interval switch was opened beforehand.
The after-wiping time, t , is re-triggerable in both cases.
AW
2 (10)
Rev. A4, 03-Apr-01
U2640B
Intermittent and Wipe/Wash Mode
Power Supply
The wipe/wash function has priority over the interval
function. If switch WIWA is closed during the interval
function, wipe/wash mode is activated immediately after
For reasons related to protection against interference and
destruction, the Pin V must be provided with an RC net-
S
work for limiting the current in the event of overvoltage
and for buffering in the event of voltage drops.
the debounce time, t , even if an on-delay is programmed
D
(t
= 0 s). Expiry of t is directly followed by the next
DEL
AW
relay on-time, t , of intermittent mode.
Proposed ratings: R = 510 W, C = 47 mF. An integrated
V V
ON
14-V Zener diode is connected between V and GND.
S
Oscillator
Interference Voltages and Load-Dump
All timing sequences are derived from an RC-oscillator
whose charging time, t , is determined by an external
1
In the case of transients, the integrated Zener diode limits
the voltage of the relay output to approximately 28 V. In
resistor, R
and whose discharging time, t is
OSC,
2,
determinated by an integrated 2-kW resistor. Since
tolerance and temperature response of the integrated
resistor are far higher than those of the external resistor,
the case of load-dump, a current (dependent upon R and
V
C ) flows through the integrated 14-V Zener diode, and
V
the relay output is switched on at V > 30 V in order to
Batt
t /t must be selected to be greater than 20 for stability
1 2
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.
reasons. The minimum value of R
should not be less
OSC
than 68 kW.
Calculating cycle duration and frequency:
t = t + t = C
( 0.74 R
+ 2260 W)
OSC
1
2
OSC
and
f
= 1/t
OSC
Calculating the capacitor for a given resistor:
= t / ( 0.74 R + 2260 W)
C
OSC
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 W)
R
ꢀ
OSC
OSC
Power-on Reset (POR)
Recommended frequency: f
= 200 Hz
OSC
(for R
= 200 kW, 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
varying the oscillator frequency (see table 1). The oscilla- defined 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]
11.84
9.68
8.45
7.40
6.57
5.92
5.38
4.93
4.55
4.23
3.95
2.96
tAW [s]
10.24
8.53
7.31
6.40
5.68
5.12
4.65
4.26
3.94
3.66
3.41
2.56
tDEL [s]
920
766
657
575
511
460
418
383
353
328
306
230
960
800
686
600
533
480
436
400
370
343
320
240
29
25
22
77
19
70
17
64
16
58
14
54
13
50
12
46
11
35
9
Rev. A4, 03-Apr-01
3 (10)
U2640B
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
1.5
A
S
Supply current pulse
300 ms
I
150
mA
mA
A
S
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
Unit
K/W
K/W
Junction ambient
Junction ambient
DIP8
SO8
R
R
thJA
thJA
160
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
Test Conditions / Pin
Symbol
Min
Typ
2.0
Max
Unit
Pin 7
Supply voltage
Supply current
Undervoltage threshold
(POR)
V
Batt
6.0
0.5
3.0
16.0
3.0
5.1
V
mA
V
I
S
V
S
Internal Z-diode
V
C
13.5
14.0
15
16.2
V
pF
W
Z
Internal capacitor
Series resistance
S
R
510
47
V
V
Filter capacitor
C
mF
Oscillator input OSC
Internal discharge resistor
Pin 8
R
1.3
2.0
3.2
kW
DIS
Lower switching-point
voltage
V
OSC
0.16 V 0.20 V 0.24 V
V
S
S
S
Upper switching-point
voltage
V
OSC
0.55 V 0.60 V 0.65 V
V
S
S
S
Input current
V
OSC
= 0 V
–I
2
mA
OSC
Oscillator frequency
f
1
200
50 k
Hz
OSC
Note: All internally generated time sequences are derived from the oscillator frquency. The tolerances refer to a
frequency adjusted to f = 200 Hz.
OSC
4 (10)
Rev. A4, 03-Apr-01
U2640B
Electrical Characteristics (continued)
Reference point Ground GND, T
= 25_C, V
= 13.5 V, unless otherwise specified (see figures 11 and 12)
amb
Batt
Parameters
Test Conditions / Pin
Symbol
Min
19.5
Typ
Max
25.5
Unit
V
Input limit switch LS
Pin 3
Internal protection-diode
voltage
Internal capacitor
I
= 10 mA
V
LS
21.0
25
LS
C
V
pF
V
LS
0.375 VS 0.5 VS 0.675 VS
Switching threshold
voltage
LS
Input current
V
LS
= V
I
R
1
27
mA
kW
kW
S
LS
Internal pull-up resistor
External protection resistor
Inputs INT, WIWA and PP
13
10
20
LS
R
S
Pins 1, 2 and 4
Internal protection-diode
voltage
Internal capacitor
I = 10 mA
E
V
19.5
21.0
25
25.5
V
E
C
pF
V
E
0.375 VS 0.5 VS 0.675 VS
Switching threshold
voltage
V
E
Input current
V = 0 V
E
–I
R
R
1
27
mA
kW
kW
E
E
S
Internal pull-down resistor
External protection resistor
Relay output
13
10
20
Pin 6
Saturation voltage
Saturation voltage
Z-diode clamp voltage
Leakage current
I = 100 mA
I = 200 mA
I = 10 mA
V = 14 V
V
V
V
1.1
1.5
V
V
REL
REL
REL
REL
19.5
21.0
33
25.5
12
V
I
mA
W
V
Relay coil resistance
R
60
28
REL
Load-dump protection
threshold
V
42
Batt
Internal pulse times
Debouncing period inputs INT/WIWA 12 - 16 clocks
t
60
15
70
80
20
ms
ms
ms
s
D
Debouncing period inputs LS
Relay activation time
Intermittent pause
3 – 4 clocks
96 clocks
t
17.5
480
5.92
DL
ON
t
t
INT
After wiping period
1024 " 68 clocks
t
4.78
440
5.46
480
s
WIWA
Pre-wash delay, reaction
time for switch-on delay =
88 – 96 clocks
t
ms
DEL
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
Rev. A4, 03-Apr-01
5 (10)
U2640B
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
max
min
6
8
10
12
14
16
18
6
8
10
12
14
16
18
V
Batt
(V)
V
Batt
(V)
Figure 3. Relay activation = f (VBatt
)
Figure 5. Pre-wash delay = f (VBatt
)
10
9
8
7
6
5
4
3
2
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
Batt
(V)
V
Batt
(V)
Figure 4. Interval pause = f (VBatt
)
Figure 6. After-wipe time = f (VBatt)
6 (10)
Rev. A4, 03-Apr-01
U2640B
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)
Figure 9. After-wipe time = f (Temperature)
0.8
8
7
6
5
4
3
2
1
0
0.7
0.6
0.5
0.4
0.3
0.2
max
min
–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
Rev. A4, 03-Apr-01
7 (10)
U2640B
Application Examples
Kl 15
Rv
510 Ω
Rosc
200 kΩ
CV
Cosc
8
6
5
7
47 µF 33 nF
U2640B
1
2
3
4
Rs
Rs
INT
10 kΩ
10 kΩ
WIWA
Water–
pump
Wiper–
motor
M
M
13903
Figure 11. Application without limit switch
Kl 15
Rv
510 Ω
Rosc
200 kΩ
CV
Cosc
8
6
5
7
47 µF 33 nF
U2640B
1
2
3
4
Rs
10 kΩ
Rs
10 kΩ
INT
Rs
10 kΩ
WIWA
Water–
pump
Wiper–
motor
End–
switch
M
M
13904
Figure 12. Application with limit switch
8 (10)
Rev. A4, 03-Apr-01
U2640B
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
1
4
Rev. A4, 03-Apr-01
9 (10)
U2640B
Ozone Depleting Substances Policy Statement
It is the policy of Atmel Germany 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.
Atmel Germany GmbH 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.
Atmel Germany GmbH 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 Atmel Wireless & Microcontrollers products for any unintended
or unauthorized application, the buyer shall indemnify Atmel Wireless & Microcontrollers 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.
Data sheets can also be retrieved from the Internet:
http://www.atmel–wm.com
Atmel Germany GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany
Telephone: 49 (0)7131 67 2594, Fax number: 49 (0)7131 67 2423
10 (10)
Rev. A4, 03-Apr-01
相关型号：
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