16/11/10 23:57:55.65 hxyacqTJ.net
>>842 CH376のデータシートによれば
R2 used to limit current of USB host provide to external USB devices, if necessary,
series with a current-limiting role fast electronic switch, USB power supply voltage must be 5V.
つう事でUSBホスト保護用の抵抗らしいね