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U846B PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 U846B
기능 Digital Wiper Control
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U846B 데이터시트, 핀배열, 회로
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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, 반도체, 판매, 대치품
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U846B
Asynchronous Debouncing Times
Ditigal debouncing by clock count makes all inputs
insusceptible to short interference pulses. The switch
input stages INT, WASH, PARK are debounced at the
positive and negative edge (reverse debouncing).
The debouncing times vary (digital uncertainty). This is
caused by the asynchronism between the random input
signal and the IC clock CL.
Short circuit debouncing is shown in figure 3.
During the relay activation time, the output current is
monitored at each positive edge of the clock. In the case
of a detected short, a 3-stage shift register counts 3
negative edges.
The output stage is disabled with the following positive
edge. Depending on when the short circuit occurs, there
is a variation of 1 clock: the delay time may last from 2
to 4 clock cycles. In the case of the other times, (e.g.,
debouncimg input INT) the digital uncertainty adds up to
± 4 cycles.
Relay Output
The relay output is an open collector Darlington transistor
stage with an integrated 28-V Zener diode which limits
the relay coil‘s inductive cut–out pulse. The maximum
static collector current must not exceed 300 mA and the
saturation voltage is typically Vsat = 1.2 V@ 200 mA.
An integrated shunt resistor measures the collector
current constantly. If a typical value of I8 = 500 mA is
exceeded, the short circuit detection buffer is set.
The output stage is switched off and is kept disabled even
if an input switch is still on. When an input switch is
opened, the short circuit buffer is reset after the debounc-
ing delay and the output can be activated again.
* *If after closing an input switch again a persistant
short is detected, the short circuit buffer is set again and
the output is disabled. If no short circuit condition is
detected normal operation continues.
In order to avoid short term disabling caused by current
pulses of transients, a typical debounce period
(tDSC = 10 ms) is provided (see figure 3).
During a load-dump pulse (VBatt > 30 V), the output
transistor is switched to conductive condition to prevent
it from being destroyed. The output transistor absorbs the
current during the load-dump pulse (1A, short term).
Short circuit detection is disabled during the load-dump.
Power-on Reset
When the supply voltage is switched on, an internal pow-
er-on reset pulse (POR) with a prolongation time of
tDPOR = 25 ms is generated to set and hold the integrated
logic at the condition which is defined initially.
During tDPOR the relay output stage is kept disabled and
the short circuit buffer is reset.
Functional Description
All timing periods refers to f0 = 320 Hz with R6 = 36 kW
and C2 = 100 nF
Interval Function
The interval mode is activated with the high side input
switch INT. After the debouncing time tDINT the relay is
activated and the wiper motor performs one turn. The be-
ginning of the interval pause depends on the application
“with or without the park-switch” (see figures 5, 6, 7 and
8). If the INT switch is opened the wiper performs a full
turn as long as the relay is energized.
Contact Current and Leakage Resistance
As the current into Pin 1 (INT) only ranges from 200 m A
to 800 m A (depending on the potentiometer value), an
external pull-down resistor helps to increase the contact
current of the interval switch INT.
The input is detected “open” and the intermittent function
is not activated if the input resistance of Pin 1 exceeds
45 kW.
Timing of the Interval Pause t2
During the interval pause the oscillator frequency is
switched from f0 to fINT. Thus the frequency-determing
resistor is now (R2 + R3). The frequency is calculated
approximately by using the following formulas:
[fINT 4.4/ (57 C2 (R2 + R3))
[t2 5700 C2 (R2 + R3)
Correct operation is ensured, with
2 kW < (R2 + R3) < 40 kW
With the recommended value of C2 = 100 nF, the pause
time can be adjusted to 1 s < t2 < 27 s (see figure 4).
When the interval pause has been completed the oscil-
lator is switched to its basic frequency f0.
4 (13)
TELEFUNKEN Semiconductors
Rev. A2, 03-Feb-97

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U846B 전자부품, 판매, 대치품
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U846B
R1
180 W
R5
47 kW
8765
U846B
1
R2
6.2 kW
234
C2
100 nF
R6
36 kW
C1
47 m F
10 V
S1
Park
switch
M
R3
S1 15 kW
OI
1/2
WIWA
M
31
Wiper motor
Interval switch
Water pump 15
Figure 7. Application circuit without park-position feedback
11636
VBatt
INT
0V
VBatt
OUT
0V
ON
MOTOR
OFF
tDINT
t1
t2
Figure 8. Intermittent circuit function without park-position feedback
t1
11637
TELEFUNKEN Semiconductors
Rev. A2, 03-Feb-97
7 (13)

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U846B

Digital Wiper Control

TEMIC Semiconductors
TEMIC Semiconductors

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