ATMEL U641B-MFPY

Features
•
•
•
•
•
•
•
•
•
Interval Pause: 4s to 20s
After-wiping Time: 2s to 20s
Wiper Motor’s Park Switch
0.6s Prewash Delay
Wipe/Wash Mode Priority
One External Capacitor Determines All Time Sequences
Relay Driver with Z-diode
Interference Protection According to VDE 0839 or ISO/TR 7637/1
Load-dump Protected
1. Description
The U641B is a bi-polar integrated circuit designed for the wiper application in the
automotive market. It includes wipe, wash and internal mode.
Interval and
Wipe/Wash
Wiper Control
IC with Delay
2. Functional Description
As a convenience feature of the windshield wiper, intermittent and wipe/wash operation functions are implemented in most of the automobiles. The U641B is a
cost-effective 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 the U641B.
U641B
4773C–AUTO–10/07
Figure 2-1.
Block Diagram
VS
PARK
OUT
8
7
WASH
6
5
VRef
VRef
Park switch
comparator
Load-dump
comparator
Input
comparator
VRef
Logic
Wipe/wash
comparator
VRef
Interval
comparator
2
A
B
C
D
E
F
1
2
3
4
GND
INT
Ct
Rt
U641B
4773C–AUTO–10/07
U641B
3. Pin Configuration
Figure 3-1.
Pinning
GND
1
8
VS
INT
2
7
OUT
CT
3
6
PARK
RT
4
5
WASH
U641B
Table 3-1.
Pin Description
Pin
Symbol
Function
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
Relay control output
8
VS
Ground
Supply voltage terminal 15
3
4773C–AUTO–10/07
4. Circuit Description
4.1
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 charged state is switched-off. As soon as
there is a positive potential at the park switch (S1), current source F (see Figure 2-1 on page 2)
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 2V. 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.
4.2
Wipe/Wash (WIWA) Operation, Pin 5
By closing the WIWA switch, S3, to supply voltage, VBatt, the water pump starts spraying the
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 source
F. If (after a time interval of approximately 600 ms) the voltage at the capacitor is greater than
6.1V, 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 2.2V.
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.
4.3
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 2V, 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 2V.
The Wipe/Wash function is not interrupted when the interval switch S2 is activated. The interval
function begins after the WIWA function has elapsed.
4
U641B
4773C–AUTO–10/07
U641B
Figure 4-1.
Application Circuit with Interval and Wipe/Wash Operation
10 kΩ
7
8
Relay
47 µF
10V
R6
10 kΩ
R5
6
5
3
4
U641B
C1
1
2
2.7 k
R2
C2
R1
22 µF
R4
510Ω
Rtime = 130 KΩ
R3
S1
S2
10 kΩ
WIWA
Park
switch
M
M
S3
31
Wiper motor
Interval switch
15
Water pump
5
4773C–AUTO–10/07
5. Absolute Maximum Ratings
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 is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Parameters
Pin
Symbol
Value
Unit
Supply voltage t = 60s, 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
I6
I5
I2
50
50
50
mA
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
6
5
2
Park switch, S1
Wipe/Wash switch, S3
Interval switch, S2
Power dissipation Tamb = 90°C
6. Thermal Resistance
Parameters
Junction ambient
6
U641B
4773C–AUTO–10/07
U641B
7. Electrical Characteristics
VBatt = 12V, Tamb = 25°C, reference point is pin 8 (see Figure 4-1 on page 5) unless otherwise specified.
Parameters
Test Conditions
Pin
Supply voltage
Supply current
8
Z-diode limitation
Symbol
Min.
VBatt
9
Typ.
Max.
Unit
16.5
V
I8
10
mA
V1
7.6
V
I1
–50
mA
VBatt
35
V
Overvoltage
Threshold current
Threshold voltage
Relay Control Output
Saturation voltage
7
I7 = 100 mA
I7 = 200 mA
Leakage current
Park Switch
Internal pull-up resistance
I6 = –10 mA
I6 = 10 mA
I7
100
µA
R6
50
kΩ
V6
–3.3
V
V6
V6
–0.8
7.6
V
V
R3
100
Ω
V2
–0.8
7.6
V
V5
–1.4/
–5.4
V
V
–0.8
7.6
V
3
Input Ct
Internal resistance
Interval Input
R2 = 2.7 to 30 kΩ
Protection diode
I2 = –10 mA
I2 = 30 mA/10 ms
WASH Input
R5 = 10 kΩ
2
5
Switching threshold/
Hysteresis
Protection diode
I5 = –10 mA
I5 = 10 mA
Switching Characteristics
R4 = 47 kΩ to 300 kΩ, I4 = –150 µA
Interval time
R3 = 0 kΩ
R3 = 10 kΩ
t2
Prewash delay
After-wipe-time
V
6
R6 = 10 kΩ
Switching threshold voltage
Protection diode
–1.0
–1.5
V7
3.6
10.8
5
t5
4.4
13.2
600
tdel
R4 = 130 kΩ
4
12
4.75
5.25
s
ms
5.75
s
7
4773C–AUTO–10/07
8. Diagrams
Figure 8-1.
Interval Pause = f (T); Ct = 22 µF
Interval Pause (s)
12
Rint = 10 kΩ
10
Rint = 5 kΩ
8
6
Rint = 0
4
2
0
-40
-20
0
20
40
60
80
100
Temperature (˚C)
Figure 8-2.
After-wiping Time = f (T); Ct = 22 µF; VBatt = 8V
After-wiping Time (s)
12
Rtime = 300 kΩ
10
8
VBatt = 8V
6
Rtime = 130 kΩ
4
Rtime = 51 kΩ
2
0
-40
-20
0
20
40
60
80
100
Temperature (˚C)
Figure 8-3.
Prewash Time = f (T); Ct = 22 µF
Prewash Delay (s)
1.0
0.8
VBatt = 16V
0.6
VBatt = 8V
0.4
0.2
0.0
-40
-20
0
20
40
60
80
100
Temperature (˚C)
8
U641B
4773C–AUTO–10/07
U641B
Figure 8-4.
Interval Pause = f (RINT); Ct = 22 µF
16
Interval Pause (s)
14
12
10
8
6
4
2
0
0
2
4
6
8
10
12
14
16
18
20
Interval Resistor (kΩ)
Figure 8-5.
After-wiping Time = f (T); Ct = 22 µF; VBatt = 16 V
After-wiping Time (s)
12
Rtime = 300 kΩ
10
8
VBatt = 16V
Rtime = 130 kΩ
6
4
Rtime = 51 kΩ
2
0
-40
-20
0
20
40
60
80
100
Temperature (˚C)
9
4773C–AUTO–10/07
9. Ordering Information
Extended Type Number
Package
Remarks
U641B-MY
DIP8
Pb-free
U641B-MFPY
SO8
Tubed, Pb-free
U641B-MFPG3Y
SO8
Taped and reeled, Pb-free
10. Package Information
Package: DIP8
Dimensions in mm
9.8 max.
7.62±0.15
9.6±0.1
0.3 B
A
2.5
3.6±0.1
4.2±0.3
6.7
1.8
1.2±0.3
0.53±0.05
2.54 nom.
0.4 A
6.3±0.1
0.36 max.
3 x 2.54 = 7.62 nom.
B
8.75±0.8
1.54
0.65
8
5
technical drawings
according to DIN
specifications
1
4
Drawing-No.: 6.543-5040.01-4
Issue: 1; 16.01.02
10
U641B
4773C–AUTO–10/07
U641B
Package: SO 8
Dimensions in mm
5±0.2
4.9±0.1
0.1+0.15
1.4
0.2
3.7±0.1
0.4
1.27
3.8±0.1
6±0.2
3.81
8
5
technical drawings
according to DIN
specifications
1
4
Drawing-No.: 6.541-5031.01-4
Issue: 1; 15.08.06
11. Revision History
Please note that the following page numbers referred to in this section refer to the specific revision
mentioned, not to this document.
Revision No.
4773C-AUTO-10/07
4773B-AUTO-09/05
History
•
•
•
•
•
Put datasheet in a new template
Pb-free logo on page 1 deleted
Figure 8-1 “Interval Pause = f (T); Ct = 22 µF” on page 8 changed
Figure 8-2 “After-wiping Time = f (T); Ct = 22 µF; VBatt = 8V” on page 8 changed
Figure 8-3 “After-wiping Time = f (T); Ct = 22 µF; VBatt = 16V” on page 9
changed
• Put datasheet in a new template
• Pb-free logo on page 1 added
• Ordering Information on page 10 changed
11
4773C–AUTO–10/07
Headquarters
International
Atmel Corporation
2325 Orchard Parkway
San Jose, CA 95131
USA
Tel: 1(408) 441-0311
Fax: 1(408) 487-2600
Atmel Asia
Room 1219
Chinachem Golden Plaza
77 Mody Road Tsimshatsui
East Kowloon
Hong Kong
Tel: (852) 2721-9778
Fax: (852) 2722-1369
Atmel Europe
Le Krebs
8, Rue Jean-Pierre Timbaud
BP 309
78054
Saint-Quentin-en-Yvelines Cedex
France
Tel: (33) 1-30-60-70-00
Fax: (33) 1-30-60-71-11
Atmel Japan
9F, Tonetsu Shinkawa Bldg.
1-24-8 Shinkawa
Chuo-ku, Tokyo 104-0033
Japan
Tel: (81) 3-3523-3551
Fax: (81) 3-3523-7581
Technical Support
a[email protected]
Sales Contact
www.atmel.com/contacts
Product Contact
Web Site
www.atmel.com
Literature Requests
www.atmel.com/literature
Disclaimer: The information in this document is provided in connection with Atmel products. No license, express or implied, by estoppel or otherwise, to any
intellectual property right is granted by this document or in connection with the sale of Atmel products. EXCEPT AS SET FORTH IN ATMEL’S TERMS AND CONDITIONS OF SALE LOCATED ON ATMEL’S WEB SITE, ATMEL ASSUMES NO LIABILITY WHATSOEVER AND DISCLAIMS ANY EXPRESS, IMPLIED OR STATUTORY
WARRANTY RELATING TO ITS PRODUCTS INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
PURPOSE, OR NON-INFRINGEMENT. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT, CONSEQUENTIAL, PUNITIVE, SPECIAL OR INCIDENTAL DAMAGES (INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS OF PROFITS, BUSINESS INTERRUPTION, OR LOSS OF INFORMATION) ARISING OUT OF
THE USE OR INABILITY TO USE THIS DOCUMENT, EVEN IF ATMEL HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. Atmel makes no
representations or warranties with respect to the accuracy or completeness of the contents of this document and reserves the right to make changes to specifications
and product descriptions at any time without notice. Atmel does not make any commitment to update the information contained herein. Unless specifically provided
otherwise, Atmel products are not suitable for, and shall not be used in, automotive applications. Atmel’s products are not intended, authorized, or warranted for use
as components in applications intended to support or sustain life.
© 2007 Atmel Corporation. All rights reserved. Atmel ®, logo and combinations thereof, and others are registered trademarks or trademarks of
Atmel Corporation or its subsidiaries. Other terms and product names may be trademarks of others.
4773C–AUTO–10/07