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U842B PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 U842B
기능 Wiper Control for Intermittent and Wipe/ Wash Mode
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U842B 데이터시트, 핀배열, 회로
U842B
Wiper Control for Intermittent and Wipe/ Wash Mode
Description
The U842B circuit is designed as an interval and
wipe/ wash timer for automotive wiper control. The
Winterval pause can be set in a range from 3 s to 11 s by an
external 1-k potentiometer. Wipe/wash mode has
priority over the interval mode. The U842B controls the
wiper motor with/without park switch signal.
The integrated relay driver is protected against short
circuits and is switched to conductive condition in the
case of a load-dump. With only a few external
components, protection against RF interference and
transients (ISO/TR 7637-1/3) can be achieved.
Features
D Interval input: low side
D Wipe/ wash input: low side
D Park input: high side (park position)
D Output driver protected against short circuit
D All time periods determined by RC oscillator
D Fixed relay activation time of 500 ms
D Adjustable interval pause from 3 s to 11 s
D Fixed pre-wash delay of 400 ms
D Dry wiping
– With park switch signal: 3 cycles
– Without park switch signal: 2.8 s
D Inputs INT, WASH and PARK digitally debounced
D All inputs with integrated RF protection
D Load-dump protection and interference protection ac-
cording to ISO 7637-1/3 (DIN 40839)
Application
Digital/ wipe-wash control for rear or front wiper
Ordring Information
Extended Type Number
U842B
U842B–FP
Package
DIP8
SO8
Remarks
Pin Description
Pin Symbol
Function
1 INT Interval input
2 WASH Wipe/ wash input
3 PARK Park switch input
4 PAUS Pause time adjust
5 OSC Oscillator input
6 VS Supply voltage
7 GND Ground
8 OUT Relay output
INT 1
8 OUT
WASH 2
PARK 3
U842B
7 GND
6 Vs
PAUS 4
5 OSC
Figure 1. Pinning
13300
TELEFUNKEN Semiconductors
Rev. A2, 03-Feb-97
1 (12)




U842B pdf, 반도체, 판매, 대치품
U842B
Wipe/ Wash Operation
CL
ON
OUT
OFF
SC
IC>500mA
01
ÉÉÉÉÉÉÉÉÉÉ
2
t7
Figure 4. The debouncing of the short circuit detection
3
13301
Relay Output
The relay output is an open collector Darlington transistor
with an integrated 28-V Z-diode for limitation of the
inductive cut-out pulse of the relay coil. The maximum
static collector current must not exceed 300 mA and the
saturation voltage is typically 1.2 V for a current of
200 mA.
The collector current is permanently measured by an inte-
grated shunt, and in the case of a short circuit
(IC > 500 mA) to Vbat, the relay output is stored disabled.
The short circuit buffer is reset by opening the INT and
WASH switches. As long as the short condition exists a
further activation of these switches will disable the output
stage again. Otherwise the normal wipe operation is per-
formed.
In order to avoid short-term disabling caused by current
pulses of transients, a 10 ms debounce period (t7) is pro-
vided (see figure 4).
During a load-dump pulse, the output transistor is
switched to conductive condition to prevent destruction.
The short circuit detection is suppressed during the load-
dump.
Interference Voltages and Load-dump
The IC supply is protected by R1, C1 and an integrated
21-V Z-diode. The inputs are protected by a series
resistor, integrated 21-V Z-diode and RF capacitor.
The RC-configuration stabilizes the supply of the circuit
during negative interference voltages to avoid power-on
reset ( POR).
The relay output is protected against short interference
peaks by an integrated 28-V Z-diode. During load-dump,
the relay output is switched to conductive condition if the
battery voltage exceeds approximately 30 V. The output
transistor is dimensioned so that it can absorb the current
produced by the load-dump pulse.
Power-on Reset
When the operating voltage is switched on, an internal
power-on reset pulse ( POR) is generated which sets the
logic of the circuits to defined initial condition. The relay
output is disabled, the short circuit buffer is reset.
Functional Description
Interval Function
The circuit is brought to its interval mode with the input
switch INT operated for more than 625 ms
( t > t4 + t4D +t5 ).
This time includes:
– 100 ms debounce time t4
– 25 ms INT switch-on delay t4D
– 500 ms relay activation time t5
If the INT input is toggled for 125 ms < t < 625 ms, the
relay activation time t5 lapses anyway and the wiper
performs one turn. To enable correct interval functioning,
the INT input has to be activated afterwards as described.
The beginning of the interval pause depends on the
application with or without wiper motor park switch ( see
figures 5, 6, 7 and 8 ).
4 (12)
TELEFUNKEN Semiconductors
Rev. A2, 03-Feb-97

4페이지










U842B 전자부품, 판매, 대치품
VBatt
WASH
0V
<t 1
U842B
OUT
VBatt
0V
PARK VBatt
0V
ON
MOTOR
OFF
t 1R
t1
wipe1
wipe2
Figure 9. Wash operation with park switch signal
t7
wipe3
13304
After operating the WASH switch, the relay is activated
after the debounce time, t1. As long as the switch is
pushed, water is sprayed on the windscreen by the wash
pump. When it is released, the dry wiping starts after 100
ms reverse debouncing (t1R).
Wipe/ Wash Mode with Park Position Feedback
If the park input of the circuit is connected to the park
switch, the dry wiping lasts three full wipe cycles (see
figure 9). During the third cycle, the wiper motor is sup-
plied via the park switch because the relay driver is
switched off after the second cycle.
Wipe/ Wash Mode without Park Position Feedback
If U842B is used without the wiper motor’s park switch,
Pin 3 stays at high potential via its integrated pull-up
resistor. Therefore, the driver stage switches off after the
fixed dry wiping time t2.
VBatt
WASH
0V
<t 1
OUT VBatt
0V
PARK VBatt
0V
ON
MOTOR
OFF
t
1R
t1
t2
Figure 10. Wash operation without park signal report
13305
TELEFUNKEN Semiconductors
Rev. A2, 03-Feb-97
7 (12)

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부품번호상세설명 및 기능제조사
U842B

Wiper Control for Intermittent and Wipe/ Wash Mode

TEMIC Semiconductors
TEMIC Semiconductors
U842B-FP

Wiper Control for Intermittent and Wipe/ Wash Mode

TEMIC Semiconductors
TEMIC Semiconductors

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