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HT642B

2019/1/3 13:08:25
詳細介紹

The HT642B is a bi-polar integrated circuit designed for the wiper application in the automotive market. It includes wipe, wash and internal mode.             

FEATURES

 Interval Pause: 4 to 20 s
 After-wiping Time: 2 to 20 s
 Wiper Motor's Park Switch
 Wipe/Wash Mode Priority
 One External Capacitor Determines All Time Sequences
 Relay Driver with Z-diode
 Load-dump Protected
 Prewash Delay 300mS
 Interference Protection According to VDE 0839 or ISO/TR 7637/1                     

FUNCTIONAL DESCRIPTION

As a convenience feature of the windshield wiper, intermittent and wipe/wash operation functions are implemented in most of the automobiles. The HT642B 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 HT642B. 

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