Digital clock integral o clock to tell time circuit diagram

Published:2011/6/24 2:34:00 Author:Nicole | Keyword: digital clock, integral o clock to tell time | From:SeekIC

The timing control circuit is made as the core of LCD digital clock chip KS5195(or KS5194), it out-connects special quartz crystal 32768Hz, the time reference can be precise adjusted by changing the capacitor C0. The integral timing signal is extracted from AL clock control terminal, when it is integral point moment, it outputs a high level signal(Vp-p=1.3V, t=50ms). IC2 adopts time base circuit 555, the monostable timing circuit is composed of IC2 and R3, C3. When it is integral point moment, VT1 is saturated and turned on by clock control timing pulse, 555's 2 foot is low level, 555 is flipped and set, 3 foot turns to high level. The high level's hold time, namely, the monostable temporary stability time is td=1.1R3C3.



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