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U2642B の電気的特性と機能

U2642BのメーカーはTEMIC Semiconductorsです、この部品の機能は「Intermittent- and Wipe/Wash Control」です。


製品の詳細 ( Datasheet PDF )

部品番号 U2642B
部品説明 Intermittent- and Wipe/Wash Control
メーカ TEMIC Semiconductors
ロゴ TEMIC Semiconductors ロゴ 




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U2642B Datasheet, U2642B PDF,ピン配置, 機能
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U2642B
Intermittent- and Wipe/Wash Control for Wiper Systems
Description
With the U264xB, TEMIC Semiconductors developed a
family of intermittent- and wipe/wash control circuits for
windshield or backlite wiper systems with identical basic
functions. The circuit design provides the possibility to
generate ”x” versions using different metallization
masks. Thus, it is easy to verify a broad range of time se-
quences which can be set independently of each other.
Features
D Relay activation can be controlled by a limit switch of
the wiper motor or by a fixed activation period for
systems without limit switch
D Debounced input stages
D Enable/disable of pre-wash delay by program pin
D Polarity of WIWA: VBatt
D Polarity of INT: VBatt
D Relay output is protected with a clamping diode
D Relay activation: 0.64 s
D Interval pause:
10 s
D After wiping:
5.8 s
D Pre-wash delay: 0.91 s
D Wipe/wash mode with priority
D Protected in accordance to ISO/TR 7637–1
D EMC with intergrated filters
Ordering Information
Extended Type Number
U2642B
U2642B–FP
Package
DIP8
SO8
Remarks
Block Diagram
VS
OSC
Voltage
stabilization
and
POR
Oscillator
INT
WIWA
LS
PP
21 V
21 V Input
comparator
21 V
21 V
GND
TELEFUNKEN Semiconductors
Rev. A2, 02-Dec-97
Logic
Load-
dump
detection
and
output
control
Open-collector
relay driver
21 V
REL
Figure 1.
13944
1 (10)

1 Page





U2642B pdf, ピン配列
U2642B
function, wipe/wash mode is activated immediately after
the debounce time, tD, even if an on-delay is programmed
(tDEL = 0 s). Expiry of tAW is directly followed by the next
relay on-time, tON, of intermittent mode.
Oscillator
All timing sequences are derived from an RC-oscillator
whose charging time, t1, is determined by an external
resistor ROSC and whose discharging time, t2, is
determinated by an integrated 2-kW resistor. Since
tolerance and temperature response of the integrated
resistor are far higher than those of the external resistor,
t1/t2 must be selected to be greater than 20 for stability
reasons. The minimum value of ROSC should not be less
than 68 kW.
Calculating cycle duration and frequency:
t = t1 + t2 = COSC ( 0.74 ROSC + 2260 W )
and fOSC = 1/t
Calculating the capacitor for a given resistor:
COSC = t / ( 0.74 ROSC + 2260 W )
Calculating the oscillator resistance for a given capacitor:
ROSC = 1.34 ( t / COSC – 2260 W )
Recommended frequency: fOSC = 200 Hz
(for ROSC = 200 kW, COSC = 33 nF)
All times can be varied jointly within specific limits by
varying the oscillator frequency (see table 1). The oscilla-
tor is operable up to 50 Hz.
Power Supply
For reasons related to protection against interference and
destruction, the Pin VS must be provided with an RC net-
work for limiting the current in the event of overvoltage
and for buffering in the event of voltage drops.
Proposed ratings: RV = 510 W, CV = 47 m F. An integrated
14-V Zener diode is connected between VS and GND.
Interference Voltages and Load-Dump
In the case of transients, the integrated Zener diode limits
the voltage of the relay output to approximately 28 V. In
the case of load-dump, a current (dependent upon RV and
CV) flows through the integrated 14-V Zener diode, and
the relay output is switched on at VBatt > 30 V in order to
avoid destruction of the output. The output transistor is
rated such that it can withstand the current generated dur-
ing the load-dump through the relay coil. In practice, the
windscreen wiper motor is switched on via the relay and
thus the amplitude of the load-dump pulse is limited. The
supply voltage of the circuit is limited to 14 V by the inte-
grated Zener diode, and the inputs are protected by
external protective resistors and integrated Zener diodes.
RF suppression is implemented with a low-pass filter at
the inputs, consisting of a protective resistor and the inte-
grated capacitor.
Power-on Reset (POR)
When the supply voltage is applied, a power-on reset
pulse is generated which sets the circuit’s logic to a de-
fined initial state. The POR threshold is approximately
VS = 4.3 V.
Table 1. Change in times by varying the oscillator frquency
fosc (Hz)
100
120
140
160
180
200
220
240
260
280
300
400
tD [ms]
140
116
100
87
77
70
64
58
54
50
46
35
tDL [ms]
35
29
25
22
19
17
16
14
13
12
11
9
tON [ms]
1280
1066
915
800
710
640
581
533
493
457
426
320
tINT [s]
20.0
17.0
14.0
12.5
11.0
10.0
9.0
8.2
7.6
7.0
6.5
5.0
tAW [s]
11.6
9.6
8.3
7.2
6.4
5.8
5.3
4.8
4.5
4.1
3.9
2.9
tDEL [s]
1680
1400
1200
1050
933
840
763
700
645
600
560
420
TELEFUNKEN Semiconductors
Rev. A2, 02-Dec-97
3 (10)


3Pages


U2642B 電子部品, 半導体
U2642B
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
6
8 10 12 14 16 18
VBatt (V)
Figure 3. Relay activation = f (VBatt)
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
6 8 10 12 14 16
VBatt (V)
Figure 4. Interval pause = f (VBatt)
18
10
9
8
7
6 max
5
4 min
3
2
1
0
6 8 10 12 14 16 18
VBatt (V)
Figure 5. After-wipe time = f (VBatt)
1.4
1.2
1.0 max
0.8 min
0.6
0.4
0.2
0
6 8 10 12 14 16 18
VBatt (V)
Figure 6. Pre-wash delay = f (VBatt)
6 (10)
TELEFUNKEN Semiconductors
Rev. A2, 02-Dec-97

6 Page



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部品番号部品説明メーカ
U2642B

Intermittent- and Wipe/Wash Control

TEMIC Semiconductors
TEMIC Semiconductors


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