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參數資料
| 型號： | U840B |
| 英文描述： | Digital / Wipe-Wash Control for Rear or Front Wiper |
| 中文描述： | 數字/擦拭為前清洗后或控制雨刷 |
| 文件頁數： | 1/8頁 |
| 文件大小： | 169K |
| 代理商： | U840B |
U840B
TELEFUNKEN Semiconductors
Rev. A2, 03-Feb-97
1 (8)
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 t
3
can be set in a range
from 0.8 s to 22 s by an external 30 k potentiometer. All
other time periods are determined by the basic frequency
f
0
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 t
4
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
Interval-switch A and B to GND
Wipe/ wash push button to V
Batt
Output driver protected against short circuit digital
debounced: t
6
= 10 ms
All time periods digital determined by RC-oscillator
Turn-on time of relay t
2
= 375 ms
Adjustable interval pause, t
3
= 0.8 to 22 s
Dry wiping time t
5
= 3.7 s
Program Pin PP determines turn-on delay t
4
during
wipe-wash mode
PP to GND: t
4
= 0.8 s
PP to V
S
: t
4
= 0 s
Interval mode: t
4
= 0 s
Inputs CP and INT digital debounced, t
1
= 100 ms
All inputs with integrated RF protection
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
1
2
3
4
5
6
7
8
Symbol
INT
CO
RO
PP
WASH
V
S
GND
OUT
Function
Interval input
C oscillator
R oscillator
Program pin
Wash signal
Supply voltage
Ground
Output
1
2
3
4
8
7
6
5
INT
CO
RO
PP
WASH
Vs
GND
13299
OUT
U840B
Figure 4. Pinning
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