Semiconductor device

A semiconductor device comprising:

• light-emitting elements;
• a selection circuit configured to accept one input signal and output a signal for selecting an element to emit light among the light-emitting elements;
• a control circuit configured to control the light-emitting elements, based on the signal outputted from the selection circuit;
• light-receiving elements each configured to receive light of each of the light-emitting elements and generate a signal for driving a switch, based on a light-receiving state;
• and
• switch elements each configured to be driven by application of voltage outputted from each of the light-receiving elements, wherein
• the input signal is a digital signal of a PWM mode, and the selection circuit outputs a signal for selecting one of the light-emitting elements to be driven, based on a duty ratio of the digital signal.

A semiconductor device comprising:

• signal transmitting elements;
• a selection circuit configured to accept one input signal and output a signal for selecting an element to transmit a signal among the signal transmitting elements;
• a control circuit configured to control the signal transmitting elements, based on the signal outputted from the selection circuit;
• signal receiving elements each configured to receive the signal transmitted from each of the signal transmitting elements and generate voltage for driving a switch, based on a receiving state;
• and
• switch elements each configured to be driven by application of voltage outputted from each of the signal receiving elements,
• wherein the input signal is an analog signal that transmits a signal, based on a voltage value thereof;
• and
• the selection circuit includes comparators and outputs a signal for selecting one of the signal transmitting elements to be driven, based on a voltage value of the input signal.

A semiconductor device comprising:

• signal transmitting elements;
• a selection circuit configured to accept one input signal and output a signal for selecting an element to transmit a signal among the signal transmitting elements;
• a control circuit configured to control the signal transmitting elements, based on the signal outputted from the selection circuit;
• signal receiving elements each configured to receive the signal transmitted from each of the signal transmitting elements and generate voltage for driving a switch, based on a receiving state;
• and
• switch elements each configured to be driven by application of voltage outputted from each of the signal receiving elements,
• wherein the input signal is a digital signal of a PWM mode, and the selection circuit outputs a signal for selecting one of the signal transmitting elements to be driven, based on a duty ratio of the digital signal.