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Atmel Electronic Components Datasheet

U2640B Datasheet

Intemittent- and Wipe/ Wash Control

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U2640B pdf
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U2640B
Intemittent- and Wipe/ Wash Control for Wiper Systems
Description
With the U264xB, Atmel Wireless & Microcontrollers
developed a family of intermittent- and wipe/wash con-
trol circuits for windshield or backlite wiper systems with
identical basic functions. The circuit design provides the
possibility to generate ”x” versions using different metal-
lization masks. Thus, it is easy to verify a broad range of
time sequences 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: 0.48 s
D Interval pause: 5.8 s
D After wiping:
5.2 s
D Pre-wash delay: 0.52 s
D Wipe/wash mode with priority
D Protected in accordance to ISO/TR 7637–1
D EMC with intergrated filters
Block Diagram
VS
OSC
Voltage
stabilization
and
POR
Oscillator
INT
WIWA
LS
PP
21 V
21 V
21 V
Input
comparator
21 V
Logic
Load-
dump
detection
and
output
control
Open-collector
relay driver
21 V
REL
GND
Figure 1. Block diagram
Ordering Information
Extended Type Number
U2640B
U2640B–FP
Package
DIP8
SO8
13944
Remarks
Rev. A4, 03-Apr-01
1 (10)


Atmel Electronic Components Datasheet

U2640B Datasheet

Intemittent- and Wipe/ Wash Control

No Preview Available !

U2640B pdf
U2640B
Pin Configuration
Pin Symbol
Function
1 INT Intermittent input
2 WIWA Wipe/wash (WIWA) input
3 LS Limit switch (wiper motor) input
4 PP Program pin
5 GND Ground
6 REL Relay output
7 VS Supply voltage
8 OSC RC oscillator input
INT 1
WIWA 2
LS 3
PP 4
8 OSC
7 VS
6 REL
5 GND
13365
Functional Description
All times specified below refer to an oscillator frequency
of 200 Hz. Figures 9 to 16 show the dependencies of the
times upon battery voltage and temperature. The
temperature dependence of the oscillator frequency is
essentially determined by the temperature coefficient of
the oscillator capacitor. The temperature dependence of
the oscillator frequency can be reduced to minimum with
a slightly negative temperature coefficient (N100). The
capacitor used in figures 10 and 11 has a slightly positive
temperatur coefficient.
All times are permanently set and can be changed only
jointly within certain limits by adjusting the oscillator
frequency. See table 1.
Intermittent Function
The relay is energized for the time tON after the switch
INT is switched on with respect to VBatt and after expira-
tion of time tD (debounce).
The debounce time ranges between 60 ms and 80 ms. A
time period of 5 ms to 40 ms for internal sequence control
must be added (asynchronism between operating instant
and internal clock) e.g., the response time may range from
65 ms up to 120 ms.
If the limit switch of the windscreen wiper motor is
connected to Pin LS, the relay is energized as long as the
switch is at high potential, regardless of the relay on-time,
tON, i.e., the motor current in interval mode flows via the
relay contact only. In park position, the motor winding at
both ends is connected to ground via the limit switch and
the motor is decelerated immediately. The limit switch
input is debounced with tDL = 17 ms.
The relay on-time, tON, always elapses – even if the
interval switch was opened beforehand.
Figure 2. Pinning
Interval Pause
The interval pause tINT = 5.8 s follows tON. Opening of
switch INT causes a debounce time, tD, and reclosing
results in the relay on-time, tON, after tD.
Wipe/Wash Function without Pre-Wash
Delay (PP connected to GND)
The water pump is switched on when the switch WIWA
is pressed and, after the debounce time, tD, the relay is
energized. After-wiping time tAW = 5.2 s starts as soon as
switch WIWA is opened and the debounce time, tD, has
expired. If the limit switch is connected, the relay remains
energized until the wiper arm returns to park position, i.e.,
the motor current flows via the relay contact only.
Wipe/Wash Function with Pre-Wash Delay
(PP connected to VS)
In wipe/wash mode, the relay is energized after a delay
time. The water pump can spray water onto the wind-
screen during the delay time, tDEL.
The on-delay time of the U2640B is:
tDEL = tD + 0.44 s = 0.52 s
If switch WIWA is closed longer than tD but shorter than
tDEL, the after-wiping time, tAW, starts after expiration of
tDEL. The wipe/wash function with or without on-delay
tDEL can be selected by programming PP.
PP connected to GND:
PP connected to VS:
without pre-wash delay
with pre-wash delay
The after-wiping time, tAW, is re-triggerable in both cases.
2 (10)
Rev. A4, 03-Apr-01


Part Number U2640B
Description Intemittent- and Wipe/ Wash Control
Maker ATMEL Corporation
Total Page 10 Pages
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