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U840B PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 U840B
기능 Digital / Wipe-Wash Control
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U840B 데이터시트, 핀배열, 회로
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U840B
Digital / Wipe-Wash Control for Rear or Front Wiper
Description
The circuits U840B (DIP8) and U840B-FP (SO8) are
designed as interval wipe/ wash timer for automotive
applications. The interval pause t3 can be set in a range
from 0.8 s to 22 s by an external 30 kW potentiometer. All
other time periods are determined by the basic frequency
f0 of the oscillator. The wipe/ wash (WIWA) mode has
priority over the interval mode. The program Pin PP
controls, whether the wiper immediatly starts to wipe, or
with a delay time t4 of 0.8 s. The inputs CP and INT are
digital debounced, the turn-on as well as the turn-off.
The integrated relay driver is protected against short
circuits and is switched to conductive condition in the
case of a load-dump. The circuit is protected with the
recommended external circuitry against load-dump and
RF interference, refer to ISO 7637–1/3 (DIN 40839).
Features
D Interval-switch A and B to GND
D Wipe/ wash push button to VBatt
D Output driver protected against short circuit digital
debounced: t6 = 10 ms
D All time periods digital determined by RC-oscillator
D Turn-on time of relay t2 = 375 ms
D Adjustable interval pause, t3 = 0.8 to 22 s
D Dry wiping time t5 = 3.7 s
D Program Pin PP determines turn-on delay t4 during
wipe-wash mode
PP to GND: t4 = 0.8 s
PP to VS: t4 = 0 s
Interval mode: t4 = 0 s
D Inputs CP and INT digital debounced, t1 = 100 ms
D All inputs with integrated RF protection
D Load-dump protected and interference protection
according to ISO 7637–1/3 (DIN 40839)
Ordering Information
Extended Type Number
U840B
U840B-FP
Package
DIP8
SO8
Remarks
Pin Description
Pin Symbol
Function
1 INT Interval input
2 CO C oscillator
3 RO R oscillator
4 PP Program pin
5 WASH Wash signal
6 VS Supply voltage
7 GND Ground
8 OUT Output
INT 1
8 OUT
CO 2
7 GND
U840B
RO 3
6 Vs
PP 4
5 WASH
Figure 4. Pinning
13299
TELEFUNKEN Semiconductors
Rev. A2, 03-Feb-97
1 (8)




U840B pdf, 반도체, 판매, 대치품
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U840B
time t2 runs off, one turn of the wiper arm is finished.
Afterwards it the interval mode can be immediatly
activated.
The resistor between the interval switch and Pin INT
determines the interval pause. The circuit U840B is so
dimensioned, that a linear resistor-time-characteristic is
used. Therefore, a doubling of the resistor evokes a doub-
ling ot the interval pause. With the help of the resistor R3
the characteristic can be shifted parallel to its axis. The
resistors R1 and R2 keep their values.
An increasing of R3 shifts the characteristic to longer
interval pauses. With it the interval pause can be adjusted
to the demanded values by the dimensioning of R3. The
resistor R3 must not be smaller than l kW, otherwise the
linearity of the resistor-time-characteristic cannot be
guaranteed and too great a current flows from the input
INT to GND.
Wipe/ Wash Releasing and Program Pin PP
After operating the wash button, the relay is activated
after the debouncing (Pin PP connects to VS). As long as
the button is pushed, water is sprayed on the windscreen
by the water pump. After releasing the wash button, after
100 ms reverse debouncing, the dry wiping time t5 begins
to start. At the end of the dry wiping time the relay is
disabled.
The input PP is connected to ground, the debouncing time
of the WIWA mode is extended for 800 ms. The water is
sprayed on the windscreen before the wiper begins its job.
PP to GND: 0.8 s delay time
PP to VS: 0.1 s delay time
Interval Wipe/Wash Mode
The interval function is interrupted when the wash button
is operated. In this case, the 0.8 s delay time t4 is reduced
to the 100 ms debouncing time. Interval function begins
after the wipe/ wash function is over.
Switch Contact Currents
The contact current of the interval switch is 0.6 to 3 mA.
Of course the current depends on the position of the
interval switches. The contact current of the wash button
is fixed by the internal resistance of the water pump. A
pull-down resistor is integrated at the input WASH.
Therefore, the input is connected to ground in the case of
an open wash push button and a pump which is not
connected.
Input Leakage Resistance
With a resistor more than 40 kW between INT to GND the
interval function is not activated.
The wipe/ wash function is not activated by a leakage
resistance > 10 kW and recommended external circuitry.
VBatt
R4
180
R5
10 k
C1
47 µF
8765
U840B
Water
pump
M
Wiper
motor
M
Park
switch
12
R3
1.4 k
C2
100 n F
R1
1.3 k
21
21
R2
4.7 k
2
31
CAB
34
R6
39 k
13286
Figure 3. Application circuit with interval and WIWA operation
4 (8) TELEFUNKEN Semiconductors
Rev. A2, 03-Feb-97

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U840B 전자부품, 판매, 대치품
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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
U840B
Package SO8
Dimensions in mm
technical drawings
according to DIN
specifications
13021
14
5.2
4.8
5.00
4.85 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
7 (8)

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링크공유

링크 :

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Digital / Wipe-Wash Control

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