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PDF ( 数据手册 , 数据表 ) U846B

零件编号 U846B
描述 Digital Wiper Control
制造商 TEMIC Semiconductors
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U846B 数据手册, 描述, 功能
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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)







U846B pdf, 数据表
www.DataSheet4U.com
U846B
Wipe/ Wash Operation
VBatt
WASH
0V
<tDWASH
VBatt
OUT
0V
VBatt
PARK
0V
tDWASH
tDWASHR
tDPARKR
ON
MOTOR
OFF
Figure 9. Wash operation with park-switch signal
11638
When the WASH switch is closed, the relay is activated
after the debounce time, tDWASH. As long as the switch is
pushed, the wash pump sprays water on the windscreen.
When the WASH switch is released, the dry wiping starts
after the “reverse” debouncing time tDWASHR = 100 ms
Wipe/ Wash Mode with Park-Position
Feedback
With the park input of the circuit connected to the wiper
motor‘s park-switch, the output stays active until an inter-
nal counter counts 2 positive edges of the park-switch i.e.,
2 full cycles for dry wiping (see figure 9).
Wipe/ Wash Mode without Park-Position
Feedback
If the U846B is used without the wiper motor’s park-
switch, Pin 4 is fixed to low potential (integrated
pull-down resistor). Therefore, the driver stage is
switched off after the dry wiping time t3 is finished, but
the wiper motor is supplied via its park-switch until the
park position is reached.
VBatt
WASH
0V
<tDWASH
VBatt
OUT
0V
ON
MOTOR
OFF
tDWASHR
tDWASH
t3
Figure 10. Wash operation without park-signal feedback
11639
8 (13)
TELEFUNKEN Semiconductors
Rev. A2, 03-Feb-97














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