15_V_LCD

Published:2009/6/30 23:48:00 Author:May | From:SeekIC

Will operate over 1 year on single 1.5-V AAA battery with accuracy of ±1 min. Basic timekeeping functions are provided by Motorola MC14440 CMOS device that includes calendar. 32.768-kHz NT-cut quartz crystal and trimming capacitor provide reference fre-quency. Output of 1.5-V alkaline cell is increased to 4 V for display by voltage tripler using MBD101 Schottky diodes.-J. Roy and A. Mou-ton, A Cordless, CMOS, Liquid-Crystal Display Clock, Motorola, Phoenix, AZ, 1977, EB-56.



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