FT4232H 是一个USB转四个串口的芯片，每个串口波特率最大12Mbps，同时可转2个SPI,I2C接口。

FT4232H USB转4口RS232电路图 原理图

FTDI FT 全系列FT2232 FT245RQ FT4232H等原理图库+PCB封装库（AD集成库）.IntLib后缀文件，拆分后文件为PcbLib+SchLib格式，Altium Designer原理图库+PCB封装库，集成库型号列表如下： Library Component Count : 36 Name Description ---------------------------------------------------------------------------------------------------- FT2232D FT2232D Dual USB to Serial UART/FIFO IC, -40 to +85 degC, 48-pin LQFP FT2232D-REEL FT2232D Dual USB to Serial UART/FIFO IC, -40 to +85 degC, 48-Pin LQFP, Pb-Free, Tape and Reel FT2232D-TRAY FT2232D Dual USB to Serial UART/FIFO IC, -40 to +85 degC, 48-Pin LQFP, Pb-Free, Tray FT2232HL-Reel Dual High Speed USB To Multipurpose UART/FIFO IC, 64-pin LQFP, Tape and Reel FT2232HL-Tray Dual High Speed USB To Multipurpose UART/FIFO IC, 64-pin LQFP, Tray FT2232HQ-Reel Dual High Speed USB To Multipurpose UART/FIFO IC, 64-pin QFN, Tape and Reel FT2232HQ-Tray Dual High Speed USB To Multipurpose UART/FIFO IC, 64-pin QFN, Tray FT232BL USB UART Asynchronous Serial Data Transfer Chip, 0 to +70 degC, 32-pin LQFP, Pb-Free FT232BL-REEL USB UART Asynchronous Serial Data Transfer Chip, 0 to +70 degC, 32-Pin LQFP, Pb-Free, Tape and Reel FT232BL-TRAY USB UART Asynchronous Serial Data Transfer Chip, 0 to +70 degC, 32-Pin LQFP, Pb-Free, Tray FT232BQ USB UART Asynchronous Serial Data Transfer Chip, 0 to +70 degC, 32-pin QFN, Pb-Free FT232BQ-REEL USB UART Asynchronous Serial Data Transfer Chip, 0 to +70 degC, 32-Pin QFN, Pb-Free, Tape and Reel FT232HL-Reel Single Channel Hi-Speed USB to Multipurpose UART/FIFO IC, 48-pin LQFP, Tape and Reel FT232HL-Tray Single Channel Hi-Speed USB to Multipurpose UART/FIFO IC, 48-pin LQFP, Tray FT232HQ-Reel Single Channel Hi-Speed USB to Multipurpose UART/FIFO IC, 48-pin QFN, Tape and Reel FT232HQ-Tray Single Channel Hi-Speed USB to Multipurpose UART/FIFO IC, 48-pin QFN, Tray FT232RL-Reel USB UART Asynchronous Serial Data Transfer Chip, 28-pin