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U840B Schematic ( PDF Datasheet ) - TEMIC Semiconductors

Teilenummer U840B
Beschreibung Digital / Wipe-Wash Control
Hersteller TEMIC Semiconductors
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Gesamt 8 Seiten
U840B Datasheet, Funktion
www.DataSheet4U.com
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 Datasheet, Funktion
www.DataSheet4U.com
U840B
Parameters
Test Conditions / Pin Symbol Min.
Typ.
Max.
Unit
Output current
Normal operation
I8 300 mA
Output pulse current
Load dump
I8 1.5 A
Internal Z-diode
Short circuit threshold
Oscillator input
V8 28
I8 500
V
mA
Oscillator capacitance,
Pin 2 (± 5%, TC MKT,
MKS2)
Oscillator resistance, Pin 3
(± 1% TC)
C2 100 nF
R6 39 kW
Oscillator frequency
Upper switching point
Lower switching point
Internal discharge resis-
tance
f0 320 Hz
V2 3 V
V2 1 V
R2 500 W
Times
External circuitry see oscillator input
Debouncing time CP, INT
Interval turn-on time
Interval pause
Turn-on delay
Wipe/ wash mode, PP to
GND
t1
t2
t3
t4 + tD
67
300
0.8
800
110
450
22
1000
ms
ms
s
ms
Dry wiping time
Debouncing time short
circuit
t5 + tD
t6
3400
6
4200
11
ms
ms
tD = debouncing time
1. Interval cycle time
2. Interval cycle time
1. Interval cycle time
t2 + t3,1
t2 + t3,2
t2 + t3,3
1200
1980
4900
1500
2450
6100
ms
ms
ms
6 (8) TELEFUNKEN Semiconductors
Rev. A2, 03-Feb-97

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