笔者几年前使用使用4245进行IO信号转换，一端供电为5V，另一端供电为3.3v  。实际中测试发现3.3v电压会升高到3.6v。3.3v供电是318芯片生成的，3.3v同时还给28335供电，我担心3.

2022-12-1911:01:41.459551+0800CarSteward[4245:1763260][tcp]tcp_input[C14.1:3]flags=[R]seq=1278556427,ack=3837105229,win=0state=LAST_ACKrcv_nxt=12785

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