CH340 区别

CH340G	USB转串口，推出时间最早，应用最广	SOP16
CH340C	USB转串口，内置晶振，引脚兼容CH340G	SOP16
CH340E	USB转串口，内置晶振，超小封装	MSOP10
CH340B	USB转串口，内置晶振和EEPROM，引脚兼容CH340G	SOP16
CH340T	USB转串口	SSOP20
CH341T	USB转串口、IIC	SSOP20
CH341H	USB转SPI	SSOP20
CH341A	USB转串口、并口、IIC和SPI	SOP28

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