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 V
Batt
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 V
Batt
. With the park switch
connected to the park input (Pin 3) the interval pause t
6
starts after the 25 ms debounce time (t
7
) is over (see
figures 5 and 6).
Wiper motor
Wash
pump
M
R
2
1.5 kΩ
R
3
1.5 kΩ
R
4
INT
1
10 kΩ
R
5
2
47 kΩ
R
6
3
10 kΩ
R
11
360
Ω
4
R
7
1.5 kΩ
13289
R
1
180
Ω
8
Park
M
Run
WASH
SETINT
VR
1
1 kΩ
7
U842B
6
R
9
220 kΩ
5
C
1
47
µF
C
2
100 nF
Figure 5. Application circuit with park switch feedback
INT
VBatt
0V
t4
t 4D
OUT
VBatt
0V
t5
t6
t 4D
PARK
VBatt
0V
t8
ON
MOTOR
OFF
13302
Figure 6. Intermittent circuit function with park position feedback
TELEFUNKEN Semiconductors
Rev. A2, 03-Feb-97
5 (12)
TEMIC [ TEMIC SEMICONDUCTORS ]
