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PDF U840B Data sheet ( Hoja de datos )
| Número de pieza | U840B | |
| Descripción | Digital / Wipe-Wash Control | |
| Fabricantes | TEMIC Semiconductors | |
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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)
1 page  
www.DataSheet4U.com
Absolute Maximum Ratings
Parameters
Supply voltage
t = 60 s
t=1h
Ambient temperature range
Storage temperature range
max. junction temperature
U840B
Symbol
VS
VS
Tamb
Tstg
TJ
Value
24
18
–40 to +100
–55 to +125
150
Unit
V
V
°C
°C
°C
Thermal Resistance
Junction ambient
Parameters
DIP8
SO8
Symbol
RthJA
RthJA
Value
110
160
Unit
K/W
K/W
Electrical Characteristics
VBatt = 13.5 V, Tamb = 25°C, reference point ground (Pin 7) circuit with recommended external circuitry
Parameters
Test Conditions / Pin Symbol
Supply
Supply voltage range
Supply current, all push-
buttons open
VS
I6
Undervoltage threshold
POR
V6
Series resistance
Filter capacitance
Internal Z-diode
INT input (Pin 1)
RV
CS
V6
Protective diode
Internal capacitance
External resistance
Leakage resistance
PP input (Pin 4)
V1
C1
RINT
RL
Protective diode
Internal capacitance
Threshold
Pull-down resistance
WASH-input (Pin 5)
V4
C4
V4
R4
Protective diode
Internal capacitance
Threshold
Leakage resistance
V5
C5
V5
RL
Pull-down resistance
R5
Relay output with limitation of short circuit current (Pin 8)
Saturation voltage 100 mA
Saturation voltage 200 mA
Relay coil resistance
V8
V8
RREL
Min. Typ. Max.
9 16
3
4
180
47
14
14
25
1
40 60
14
13
0.5 * VS
120
14
25
0.5 VS
10
20
1.0
1.2
60
Unit
V
mA
V
W
mF
V
V
pF
kW
kW
V
pF
V
kW
V
pF
V
kW
kW
V
V
W
TELEFUNKEN Semiconductors
Rev. A2, 03-Feb-97
5 (8)
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet U840B.PDF ] | |
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