Intemittent- and Wipe/ Wash Control
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U2640B
Intemittent- and Wipe/ Wash Control for Wiper Systems
Description
With the U264xB, Atmel Wir...
Description
www.DataSheet4U.com
U2640B
Intemittent- and Wipe/ Wash Control for Wiper Systems
Description
With the U264xB, Atmel Wireless & Microcontrollers developed a family of intermittent- and wipe/wash control circuits for windshield or backlite wiper systems with identical basic functions. The circuit design provides the possibility to generate ”x” versions using different metallization 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: 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 7637–1 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 Loaddump detection and output control Open-collector relay driver REL 21 V
GND
13944
Figure 1. Block diagram
Ordering Information
Extended Type Number U2640B U2640B–FP Package DIP8 SO8 Remarks
Rev. A4, 03-Apr-01
1 (10)
U2640B
Pin Configuration
Pin 1 2 3 4 5 6 7 8 Symbol INT WIWA LS PP GND REL VS OSC Function Intermittent input Wipe/wash (WIWA...
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