短絡保護機能のための端子です。この端子に外付け出力 Tr電流をモニタさせ、過剰な電流が発生した場合にフォトIC出力を停止する (外付け出力 Trの破壊を防ぐ)機能が働きます。
MRG出力は、OUT出力やDSP出力 (動作表示出力)とは違い、あくまでも余裕度 (十分なLED光量が入射された状態で動作しているか)を表す出力のため、ヒステリシスのない出力になっています。したがって、MRGレベル (スレッショルド照度の2倍)付近の入射光で、MRG出力はチャタリングを起こしますが、問題はありません。
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