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U2640B Datasheet

  • U2640B

  • Intermittent- and Wipe/Wash Control for Wiper Systems

  • Atmel   Atmel

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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 鈥漻鈥?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: V
Batt
D
Polarity of INT:
V
Batt
D
Relay output is protected with a clamping diode
D
Relay activation:
D
Interval pause:
D
After wiping:
D
Pre-wash delay:
0.48 s
5.8 s
5.2 s
0.52 s
D
Wipe/wash mode with priority
D
Protected in accordance to ISO/TR 7637鈥?
D
EMC with intergrated filters
Block Diagram
VS
OSC
Voltage
stabilization
and
POR
Oscillator
INT
21 V
WIWA
21 V
LS
21 V
PP
21 V
Input
comparator
Logic
Load-
dump
detection
and
output
control
Open-collector
relay driver
REL
21 V
GND
13944
Figure 1. Block diagram
Ordering Information
Extended Type Number
U2640B
U2640B鈥揊P
Package
DIP8
SO8
Remarks
Rev. A4, 03-Apr-01
1 (10)

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