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Digital display multifunction thermometer circuit

2016-12-03 14:59  
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Digital display multifunction thermometer circuit
The functions of this circuit are: alarm, display, timing, digital display and temperature display. MM5406 is the part of clock, it is PMOS IC, 40-foot packaging, its functions include: alarm, stop alarming, sleep, 12/24h time selection, second display, fast set h, slow set min, 50/60Hz clock selection. MM5407 is thermometer used IC, the temperature range is -40~+88℃, the temperature sensor uses LM334 or SL334, the temperature factor is 10mV/℃, it can be adjusted by W4. This circuit has 9V spare battery. When the AC power is cut off, this battery is used as power supply, then the time clock works normally, but LED will be turned off due to the power failure.