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您好,后缀V版本和不带V的区别在于pin5, 带V的pin 5是Vio:Supply voltage for I/O level shifter。 可以看到它的电压范围为1.7V到5.5V,也就是说逻辑控制引脚STB,RXD, TXD这几个引脚可以使用不同的逻辑电平和MCU接,比如1.8V VIO会使得控制引脚STB,RXD和TXD的电平也为1.8V,免去使用电平转换器件。