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US 2004/0169582 A1Published application
Semiconductor device
AssigneeSeiko Instruments Inc.
InventorYoichi Endo
Life of this patent
Estimating the term…
Abstract
A semiconductor device that achieves a stable communication range and consumes less current of a radio circuit is provided. In a radio control of a wireless door opening and closing system, the current consumption is lowered by intermittent operation by a timer circuit, and a radio reaching range is stabilized by optimizing power that is supplied to a transmission circuit.
Claims9
A semiconductor device comprising:
- a command data circuit for outputting signals in response to a CE signal, a clock signal, and a data signal of a microcomputer;
- a memory circuit stores a data for rolling codes to output the data to a microcomputer through the command data circuit;
- a timer period setting register for outputting a signal that sets a period of intermittent operation of the microcomputer in response to an output signal of the command data circuit;
- a timer circuit for outputting an enable signal, which puts the microcomputer into an intermittent operation, upon receiving an output signal of the command data circuit, the output signal of the timer period setting register, and a signal of a crystal oscillator;
- a regulator output voltage setting register for outputting a signal in response to an output signal of the command data circuit;
- and
- a regulator circuit for outputting an output voltage upon receiving an input voltage and the output of the regulator output voltage setting register.
4 more elements
A semiconductor device comprising:
- a timer circuit for controlling an operation time of a wireless transmission circuit;
- a regulator circuit for supplying power to the transmission circuit;
- a memory circuit for rolling codes;
- and
- an enable terminal for outputting an enable signal that activates a microcomputer,
- wherein the enable signal is outputted in accordance with a timetable controlled by the timer circuit, and
- wherein an intermittent operation of the microcomputer is achieved by switching the enable signal between an active state and an inactive state.
4 more elements
Dependencies are inferred from the claim text.