Electronic circuit for a quartz crystal watch
AssigneeEbauches S.A.
InventorsIgor Scherrer, Pierre Hersberger
Life of this patent
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Abstract
An electronic timepiece havng an integrated electronic circuit including a quartz crystal oscillator, connected to a multi-stage divider, which divider supplies various outputs of various frequencies to corrector circuits, a logic circuit and a motor control circuit. The motor control circuit includes a switch to allow the timepiece to be stopped by resetting at least one stage of the divider. One of the terminals of the motor is connected to one of the stages of the divider to allow the control of the frequency of the signal issued from this stage, and, therefore, the frequency of the quartz oscillator.
Claims4
An electronic timepiece comprising a quartz crystal, a power supply having two output terminals, a stepping motor having two feeding terminals and an integrated circuit having terminals, said power supply terminals connected to said integrated circuit, said integrated circuit comprising:
- an oscillator circuit coupled to said crystal for delivering on its output a first signal of a first frequency:
- a multistage divider connected to said oscillator output for delivering on at least a first output a second signal of a second frequency;
- a control stage connected to the first output of the divider for applying driving current pulses to the feeding terminals of the motor through a first and second of said integrated circuit terminals;
- and
- circuit means for performing at least one auxiliary function, directly connected to said first integrated circuit terminal, whereby no supplementary terminal is needed on said integrated circuit for connecting said circuit means.
Dependencies are inferred from the claim text.