Semiconductor device and electronic timepiece

Patent metadata

Field	Value
Publication number	US-9857774-B2
Application number	US-201615149287-A
Country	US
Kind code	B2
Filing date	May 9, 2016
Priority date	Jul 14, 2015
Publication date	Jan 2, 2018
Grant date	Jan 2, 2018

Abstract

A semiconductor device includes: a secondary battery; a constant voltage generation circuit that is driven in accordance with the secondary battery; a control logic circuit that is driven with a constant voltage generated by the constant voltage generation circuit and controls the constant voltage generation circuit; and a starting circuit that outputs a control signal for operating the constant voltage generation circuit in correspondence to an initialization signal input from outside in a case in which the constant voltage generation circuit is stopped.

First claim

What is claimed is:

1. A semiconductor device comprising:
a constant voltage generation circuit that is driven in accordance with a power supply;
a constant voltage control circuit that is driven with a constant voltage generated by the constant voltage generation circuit and controls the constant voltage generation circuit; and
a starting circuit that is different from the constant voltage control circuit and outputs a control signal to the constant voltage generation circuit to start generation of the constant voltage by the constant voltage generation circuit without a control of the constant voltage generation circuit by the constant voltage control circuit in response to an initialization signal input from outside of the semiconductor device in a case in which the constant voltage generation circuit is stopped.

2. The semiconductor device according to claim 1 , further comprising:
an oscillation circuit that is driven with the constant voltage generated by the constant voltage generation circuit,
wherein the constant voltage generation circuit is configured to be able to switch between a first voltage and a second voltage higher than the first voltage to generate the voltage as the constant voltage, generates the second voltage when the control signal is input from the starting circuit, and switches the second voltage to the first voltage after a predetermined time passes.

3. An electronic timepiece comprising:
the semiconductor device according to claim 1 .

4. An electronic timepiece comprising:
the semiconductor device according to claim 2 .

5. The electronic timepiece according to claim 3 , further comprising:
a manipulation member; and
an initialization signal output unit that outputs the initialization signal to the starting circuit according to a manipulation of the manipulation member.

6. The electronic timepiece according to claim 4 , further comprising:
a manipulation member; and
an initialization signal output unit that outputs the initialization signal to the starting circuit according to a manipulation of the manipulation member.

Assignees

• Seiko Epson Corp

Inventors

• Ninomiya Masaya

Classifications

• G04G19/06 Primary

  Regulation · CPC title

• G04F5/04

  using oscillators with electromechanical resonators {producing electric oscillations or timing pulses} · CPC title

• H03L3/00

  Starting of generators · CPC title

• G04G19/00

  Electric power supply circuits specially adapted for use in electronic time-pieces · CPC title

• G05F3/16

  being semiconductor devices · CPC title