Patent ID: 8462005

Claim:
A communication circuit comprising: a first reference potential input terminal configured to receive a first reference potential; a first power supply potential input terminal configured to receive a first power supply potential different from the first reference potential by a predetermined potential; a second reference potential input terminal configured to receive a second reference potential; a direct-current converter circuit configured to generate a second power supply potential different from the second reference potential by the predetermined potential, from the first power supply potential; a first receiving circuit configured to receive a binary communication signal, whose one level is at the first reference potential, through the first signal input terminal, by a differential transmission method; a first level shift circuit configured to convert the communication signal received by the first receiving circuit into a binary communication signal, whose one level is at the second reference potential, and the other level is at the second power supply potential; and a first transmission circuit configured to output the binary communication signal converted by the first level shift circuit, through a first signal output terminal, by a differential transmission method.