U2640B

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...