Watch and manufacturing method of constant current circuit

A watch comprising a constant current circuit, the constant current circuit including:

• a plurality of resistors coupled in series between a first power supply and a second power supply, the first power supply being one of a high potential side power supply and a low potential side power supply, the second power supply being the other of the high potential side power supply and the low potential side power supply;
• a plurality of connection wiring lines each provided for each of the plurality of resistors, each of the plurality of connection wiring lines being configured to couple the first power supply and a terminal on the first power supply side of each of the plurality of resistors;
• a non-disconnected fuse provided in a non-disconnected state to one connection wiring line of the plurality of connection wiring lines;
• and
• a disconnected fuse provided in a disconnected state to each of the rest of connection wiring lines other than the one connection wiring line of the plurality of connection wiring lines.

A manufacturing method of a constant current circuit, the method comprising:

• preparing a constant current circuit including
• a current mirror circuit coupled between a first power supply and a second power supply, and including a first current stabilizing transistor and a second current stabilizing transistor,
• a plurality of regulating transistors coupled in series between the first power supply and the first current stabilizing transistor,
• a plurality of connection wiring lines each provided for each of the plurality of regulating transistors, and configured to couple the first power supply and a terminal on a first power supply side of each of the plurality of regulating transistors,
• a plurality of fuses inserted to the plurality of connection wiring lines respectively, and
• a plurality of simulation disconnecting transistors configured to switch each of the plurality of connection wiring lines between a disconnected state and a connected state;
• determining a connection wiring line to be selected by sequentially performing on the plurality of connection wiring lines a simulation disconnection in which one of the plurality of connection wiring lines is set to a connected state and the other connection wiring lines are set to a disconnected state by using the plurality of simulation disconnecting transistors;
• and
• disconnecting a fuse other than a fuse, which corresponds to the connection wiring line to be selected, of the plurality of fuses.