フィリップス社が開発したシリアルインターフェース。アイ・スクウェア・シーと読みますが、アイ・ツー・シーとも言います。2本の信号線、SCL (serial clock)とSDA (serial data)によってIC間の情報伝達を可能にします。家電製品・携帯電話・デジタルカメラ・オーディオ機器において用いられ、数百kHz程度の低速な周辺素子をマイコンに接続する場合などに用いられています。
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