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U2640B Datasheet

Intemittent- and Wipe/ Wash Control

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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 Corporation
ATMEL Corporation



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