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PDF U846B Data sheet ( Hoja de datos )
| Número de pieza | U846B | |
| Descripción | Digital Wiper Control | |
| Fabricantes | TEMIC Semiconductors | |
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U846B
Digital Wiper Control for Intermittent and Wipe/ Wash Mode
Description
The U846B is a bipolar integrated circuit for automotive
use (“Rugged Silicon”) in interval and wipe/ wash control
of windshield or backlite wipers.
The interval pause can be set individually within a wide
range by using a potentiometer. Wipe / wash mode with
*dry wiping activated either for 2 wipes or for a certain
*time has priority over the interval mode.
The U846B is used in applications to control wiper
motors with or without park-switch signal feedback. The
integrated relay driver is protected against short circuits
and is switched to conductive condition in the case of a
load-dump. By using only a few external components,
protection against RF interference and ISO transients can
be achieved.
Features
D Interval input: high side
D Wipe/ wash input: high side
D Park input: low side (park position)
D Output driver protected against short circuits
D All time periods determined by an RC-oscillator
D Typical relay activation time of 500 ms
D Adjustable interval pause from 1.2 s to 27 s
D Typical pre-wipe delay of 100 ms
D Dry wiping
D – With park-switch signal: 2 cycles
D – Without park-switch signal typically 5.25 s
D Inputs INT, WASH and PARK digitally debounced
D All inputs with integrated RF protection
D Load-dump protection and interference protection
according to ISO 7637–1/4 (DIN 40839)
Application
Digital interval / wipe/ wash control for windshield or
backlite wiper motors with a 22-kW potentiometer
(typical value) for interval pause adjustment.
Recommended oscillator circuitry:
R6 = 36 kW ; C2 = 100 nF.
Ordering Information
Extended Type Number
U846B
U846B–FP
Package
DIP8
SO8
Remarks
Pin Description
Pin Symbol
Function
1 INT Interval input
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ2 C Oscillator C
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ3 R Oscillator R
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ4 PARK Park-switch input
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ5 WASH Wipe/wash input
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ6 VS Supply voltage
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ7 GND Ground
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ8 OUT Relay output
INT 1
8 OUT
C2
7 GND
U846B
R3
6 Vs
PARK 4
5
Figure 13. Pinning
WASH
12749
TELEFUNKEN Semiconductors
Rev. A2, 03-Feb-97
1 (13)
1 page  
www.DataSheet4U.com
U846B
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
2
96 12008
7 12 17 22 27 32 37 42 47
R2 + R3 ( kW )
Figure 4. Pause time t2/ s versus resistor (R2 + R3)/ kW
VBatt
INT
0V
VBatt
OUT
0V
VBatt
PARK
0V
tDINT
t1
tDPARKR
Interval Function with Park-Switch Feed-
back
During the relay activation time, t1, the wiper motor‘s
park-switch leaves its park position and changes its
potential from GND to VBatt. The output is kept active as
long as the park-switch stays at high potential, even if the
relay activation time has expired in the meantime. If the
park-switch is connected to the PARK input (Pin 4), the
interval pause t2 starts after the 25 ms debounce time
tDPARK (see figures 5 and 6).
If the INT switch is opened while the relay is still
energized, the wiper motor turns on until it reaches its
park position. The motor current can flow only via the
relay contact.
11635
t1
t2
tDPARKR
ON
MOTOR
OFF
Figure 5. Intermittent circuit function with park-position feedback
TELEFUNKEN Semiconductors
Rev. A2, 03-Feb-97
5 (13)
5 Page 
www.DataSheet4U.com
U846B
Electrical Characteristics (continued)
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TELEFUNKEN Semiconductors
Rev. A2, 03-Feb-97
11 (13)
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet U846B.PDF ] | |
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