U641B_05 Datasheet, PDF (1/12 Pages) ATMEL Corporation – Interval and Wipe/Wash Wiper Control IC with Delay

Features
• Interval Pause: 4s to 20s
• After-wiping Time: 2s to 20s
• Wiper Motor’s Park Switch
• 0.6s Prewash Delay
• Wipe/Wash Mode Priority
• One External Capacitor Determines All Time Sequences
• Relay Driver with Z-diode
• Interference Protection According to VDE 0839 or ISO/TR 7637/1
• Load-dump Protected
1. Description
The U641B is a bi-polar integrated circuit designed for the wiper application in the
automotive market. It includes wipe, wash and internal mode.
2. Functional Description
As a convenience feature of the windshield wiper, intermittent and wipe/wash opera-
tion functions are implemented in most of the automobiles. The U641B is a cost-
effective solution for an accurate timing function control. Wipe/wash mode has priority
over interval mode. Interval pause and after-wiping time can be set to fixed values by
using resistors in a broad time range. Added value can be provided with an individual,
continuous adjustment of the interval pause by a potentiometer which may be built
into the stalk. For proper operation, it is mandatory to feed the signal of the wiper
motor's park switch into the U641B.
Interval and
Wipe/Wash
Wiper Control
IC with Delay
U641B
Rev. 4773B–AUTO–09/05