U2640B

Rev. A4, 03-Apr-01

1 (10)

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 INT:

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

21 V

21 V

21 V

21 V

Input

comparator

Voltage

stabilization

and

POR

Logic

Load-

dump

detection

and

output

control

Oscillator

21 V

Open-collector

relay driver

V

S

OSC

INT

WIWA

LS

PP

GND

REL

13944

Figure 1. Block diagram

Ordering Information

Extended Type Number

Package

Remarks

U2640B

DIP8

U2640B–FP

SO8