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PDF U642B Data sheet ( Hoja de datos )
| Número de pieza | U642B | |
| Descripción | Interval- and Wipe/ Wash Wiper Control IC | |
| Fabricantes | ATMEL Corporation | |
| Logotipo |  |
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Interval- and Wipe/ Wash Wiper Control IC
U642B
Description
As a convenience feature of the windshield wiper
intermittent and wipe/wash operation are implemented in
most of the automobiles. The U642B is the low-cost
solution for an accurate timing function control.
Wipe/wash mode has priority over interval mode. Interval
pause and afterwiping 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 U642B.
Features
D Interval pause: 4 to 20 s
D Afterwiping time: 2 to 20 s
D Wiper motor’s park switch
D Wipe/wash mode priority
D One external capacitor, determines all time sequences
D Relay driver with Z-diode
D Interference protection according to VDE 0839 or
ISO/TR 7637/1
D Load-dump protected
Block Diagram
VS
8
OUT
7
Load-dump
comparator
PARK
6
VRef
WASH
5
VRef
Park switch Input
comparator comparator
VRef
VRef
Logic
Wipe / wash
comparator
Interval
comparator
A
B
C
DE F
1
GND
23
INT Ct
Figure 1. Block diagram
4
Rt
94 8950
Rev. A4, 10-Apr-01
1 (7)
1 page  
U642B
Electrical Characteristics (continued)
VBatt = 12 V, Tamb = 25°C, reference point is Pin 8 (see figure 3) unless otherwise specified.
Parameters
Test Conditions / Pins Symbol Min. Typ.
WASH Input, R5 = 10 kW
Switching threshold/Hysteresis
Pin 5
Protection diode
I5 = –10 mA
I5 = 10 mA
Switching Characteristics, R4 = 47 kW to 300 kW, I4 = –150 mA
Interval time
R3 = 0 kW
R3 = 10 kW
Prewash delay
After-wipe-time
R4 = 130 kW Pin 5
V5
V
t2
tdel
t5
–1.4/–5.4
–0.8
7.6
3.6 4
10.8 12
100
4.75 5.25
Max.
4.4
13.2
5.75
Unit
V
V
s
ms
s
12
Rint = 0
10
Rint = 5 kW
8
6
Rint = 10 kW
4
2
14005
0
–40 –20
0 20 40 60
Temperature ( °C )
80 100
Figure 4. Interval pause = f ( T); Ct = 22 mF
12
Rtime = 51 kW
10
8
VBatt = 8 V
6
4
2
Rtime = 130 kW
Rtime = 300 kW
14006
0
–40 –20
0 20 40 60
Temperature ( °C )
80 100
Figure 5. Afterwiping time = f ( T); Ct = 22 mF
16
14
12
10
8
6
4
2
0
0 2 4 6 8 10 12 14 16 18 20
14009
Interval resistor ( kW )
Figure 6. Interval pause = f ( RINT); Ct = 22 mF
12
Rtime = 51 kW
10
8
VBatt = 16 V
6
4
2
Rtime = 130 kW
Rtime = 300 kW
14007
0
–40 –20
0 20 40 60
Temperature ( °C )
80 100
Figure 7. Afterwiping time = f ( T); Ct = 22 mF
Rev. A4, 10-Apr-01
5 (7)
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet U642B.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
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