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參數(shù)資料
| 型號： | U840B-FP |
| 英文描述： | Digital / Wipe-Wash Control for Rear or Front Wiper |
| 中文描述： | 數(shù)字/擦拭為前清洗后或控制雨刷 |
| 文件頁數(shù)： | 3/8頁 |
| 文件大?。?/td> | 169K |
| 代理商： | U840B-FP |
U840B
TELEFUNKEN Semiconductors
Rev. A2, 03-Feb-97
3 (8)
The relay output is activated. The internal logic of the IC
queries the short-circuit detection SC during the positive
slope of the system clock CL. A 3-stage shift register is
loaded by the positive slope of clock 1, 2 and 3 and the
relay output is switched off. A short circuit signal which
happened after the positive slope of clock 0 is just
recognized by the positive slope of clock l. Therefore the
debouncing of the short signal continues two to three
clock periods.
t
6
CL
SC
REL
ON
Figure 2. The debouncing of the short circuit detection
These times can be adjusted (except t
3
) by variation of the
external frequency determined devices. The oscillator
frequency is calculated approximately with the following
formula:
f
0
1 (0.832
C
2
(300
R
6
))
The resistor between the interval switch and Pin INT
determines the interval pause. During the interval pause
the current source is switched, the frequency is
determined by the interval resistor. After the end of the
interval pause, the oscillator switches again to the basic
frequency. This procedure allows interval pause times
between 0.8 s to 22 s.
The dependence of the interval pause t
3
from the interval
resistor and therefore from the position of the switch A
and B is shown in table 1.
Table 1. Function table
WASH
L
X
L
L
L
H
B
1
X
2
3
X
X
A
1
X
1
1
2
X
INT
OFF
X
R
1
+R
2
R
1
GND
X
C
1
2
1
1
1
1
OUT
OFF
ON
INT
1
INT
2
INT
3
WIWA
Note
+V
OUT C
11 cycles/min
27 cycles/min
44 cycles/min
Relay Output
The relay output is an open-collector Darlington
transistor with integrated 28-V Z-diode for limitation of
the inductive cut-out pulse of the relais coil. The
maximum static collector current must not exceed
300 mA and saturation voltage is typically 1.2 V
for a
current of 200 mA.
The collector current is permanently measured by an
integrated shunt and in the case of a short-circuit
(I
C
> 500 mA) to V
Batt,
the relais output is stored
disabled.
The backspacing of the short-circuit buffer is possible if
the switches interval and wipe/ wash are opened. A new
attempt to switch on from INT or WASH cause again a
switch off of the relay output, if the short-circuit still
exists, otherwise the normal function is possible.
The short-circuit detection is digital debounced about a
period of l0 ms, so that shorter interference peaks at the
power supply do not disable the output transistor because
the interference peaks cause a higher current and pretend
a short-circuit.
During a load-dump impulse the output transistor is
switched to conductive condition to prevent destruction.
The short circuit detection is suppressed during the load-
dump.
Interference Voltages and Load-Dump
The IC supply is protected by R
4
, C
1
and an integrated
Z-diode, the inputs are protected by a series resistor,
integrated 14-V Z-diode and RF capacitor.
The RC-configuration stabilizes the supply of the circuit
during negative interference voltages so that the
power-on reset (POR) does not arise and reset the function
of the circuit.
The relay output is protected against short interference
peaks by an intergrated 28-V Z-diode, and during
load-dump the relais output is switched to conductive
condition for a battery voltage of greater than
approximately 30 V. The output transistor is dimensioned
so that it can absorb the current, produced by the
load-dump pulse.
Power-on Reset
When the operating voltage is switched on, an internal
power-on reset pulse (POR) is generated which sets the
logic of the circuits to defined intinial condition. The
relay output is disabled, the short circuit buffer is reset.
Functional Description
Interval Function
By closing the interval switch A and/or B to GND (refer
to function table l) for a time longer than the debouncing
time t
1
= l00 ms the relay is activated for a time of
t
2
= 375 ms, whereafter the interval pause begins. The
oscillator switches to a frequency which is determined by
R
1
to R
3
. At the end of the interval pause, t
3
, the relay is
activated for a time t
2
.
If, during the turn-on time of the relay, the switches A and
B are opened (also the opening is debounced), then the
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