Sleep cycle counting device, sleep cycle counting method and electronic tag device using the same

摘要

A sleep cycle counting device may include an oscillating unit receiving a voltage having a predetermined level and outputting an oscillating signal, a dividing unit dividing the oscillating signal, a sleep cycle setting unit setting a sleep cycle, a dividing ratio controlling unit varying a dividing ratio of the dividing unit according to the sleep cycle, and a sleep mode controlling unit counting the number of clocks in the divided oscillating signal and outputting a wakeup or a sleep signal.