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1. RXD 的高电平Vih(min)=0.8Vcc, 您的VCC是多少？ Vcc的电压范围为4.5V~5.5V, 典型值为5V, 如果为5V的话, RXD的Voh(min)=4V,没问题.
2. 带V的指的是内部集成IO电平转换: The TCAN1044V includes internal logic level translation via the VIO terminal to allow for
interfacing the transceiver IOs directly to 1.8-V, 2.5-V, 3.3-V, or 5-V logic IOs.
