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PDF U842B Data sheet ( Hoja de datos )
| Número de pieza | U842B | |
| Descripción | Wiper Control for Intermittent and Wipe/ Wash Mode | |
| Fabricantes | TEMIC Semiconductors | |
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U842B
Wiper Control for Intermittent and Wipe/ Wash Mode
Description
The U842B circuit is designed as an interval and
wipe/ wash timer for automotive wiper control. The
Winterval pause can be set in a range from 3 s to 11 s by an
external 1-k potentiometer. Wipe/wash mode has
priority over the interval mode. The U842B controls the
wiper motor with/without park switch signal.
The integrated relay driver is protected against short
circuits and is switched to conductive condition in the
case of a load-dump. With only a few external
components, protection against RF interference and
transients (ISO/TR 7637-1/3) can be achieved.
Features
D Interval input: low side
D Wipe/ wash input: low side
D Park input: high side (park position)
D Output driver protected against short circuit
D All time periods determined by RC oscillator
D Fixed relay activation time of 500 ms
D Adjustable interval pause from 3 s to 11 s
D Fixed pre-wash delay of 400 ms
D Dry wiping
– With park switch signal: 3 cycles
– Without park switch signal: 2.8 s
D Inputs INT, WASH and PARK digitally debounced
D All inputs with integrated RF protection
D Load-dump protection and interference protection ac-
cording to ISO 7637-1/3 (DIN 40839)
Application
Digital/ wipe-wash control for rear or front wiper
Ordring Information
Extended Type Number
U842B
U842B–FP
Package
DIP8
SO8
Remarks
Pin Description
Pin Symbol
Function
1 INT Interval input
2 WASH Wipe/ wash input
3 PARK Park switch input
4 PAUS Pause time adjust
5 OSC Oscillator input
6 VS Supply voltage
7 GND Ground
8 OUT Relay output
INT 1
8 OUT
WASH 2
PARK 3
U842B
7 GND
6 Vs
PAUS 4
5 OSC
Figure 1. Pinning
13300
TELEFUNKEN Semiconductors
Rev. A2, 03-Feb-97
1 (12)
1 page  
U842B
Interval Function with Park-Switch Feedback
During the relay activation time the wiper motor leaves
its park position and the park switch changes its potential
from VBatt to GND. After the relay is switched off the
wiper motor is supplied via the park switch until the park
position is reached again. The park switch changes its
potential from GND back to VBatt. With the park switch
connected to the park input (Pin 3) the interval pause t6
starts after the 25 ms debounce time (t7) is over (see
figures 5 and 6).
Wash
pump
M
R2
1.5 kΩ
INT
WASH
SETINT
VR1
1 kΩ
R3
1.5 kΩ
R4
10 kΩ
R5
47 kΩ
R6
10 kΩ
R11
360 Ω
R1
180 Ω
18
27
U842B
36
45
R7
1.5 kΩ
Wiper motor
M
R9
220 kΩ
C1
47 µF
C2
100 nF
Figure 5. Application circuit with park switch feedback
Park
Run
13289
VBatt
INT
0V
t4
OUT VBatt
0V
t 4D
t5
t6
VBatt
PARK
0V
ON
MOTOR
OFF
t8
Figure 6. Intermittent circuit function with park position feedback
t 4D
13302
TELEFUNKEN Semiconductors
Rev. A2, 03-Feb-97
5 (12)
5 Page 
Package Information
Package DIP8
Dimensions in mm
9.8
9.5
1.64
1.44
7.77
7.47
4.8 max
0.5 min 3.3
0.58
0.48 2.54
7.62
85
6.4 max
0.36 max
9.8
8.2
U842B
technical drawings
according to DIN
specifications
13021
14
Package SO8
Dimensions in mm
5.00
4.85
5.2
4.8
3.7
1.4
0.4
0.25 0.2
0.10 3.8
1.27 6.15
3.81 5.85
85
technical drawings
according to DIN
specifications
85
13034
TELEFUNKEN Semiconductors
Rev. A2, 03-Feb-97
11 (12)
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet U842B.PDF ] | |
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