General Description
The FT2232D is a USB interface which incorporates the functionallity of two of FTDI’s second generation BM chips into a single device. A single downstream USB port is converted to two IO channels which can each be individually configured as a FT232BM-style UART interface, or a FT245BM-style FIFO interface, without the need to add a USB hub. There are also several new special modes which are either enabled in the external EEPROM, or by using driver commands. These include Synchronous Bit-Bang Mode, a CPU-Style FIFO Interface Mode, a Multi-Protocol Synchronous Serial Engine Interface Mode, MCU Host Bus Emulation Mode, and Fast Opto-Isolated Serial Interface Mode.

FEATUREs Summary
Hardware Features
• Single chip USB to dual channel serial / parallel ports with a variety of configurations.
• Entire USB protocol handled on the chip...no USB specific firmware programming required.
• FT232B-style asynchronous serial UART interface option with full hardware handshaking and modem interface signals.
• UART Interface supports 7 / 8 bit data, 1 / 2 stop bits, and Odd / Even / Mark / Space / No Parity
• Fully assisted hardware or X-On / X-Off software handshaking.
• Transfer Data Rate 300 to 1 Mega Baud (RS232).
• Transfer Data Rate 300 to 3 Mega Baud (at TTL levels and RS422 / RS485).
• Auto transmit enable control for RS485 serial applications using TXDEN pin.
• In-built support for event characters and line break condition.
• Transmit and receive LED drive signals on each channel.
• FT245B-style FIFO interface option with bidirectional data bus and simple 4 wire handshake interface.
• USB to parallel FIFO transfer data rate up to 1 megabyte / second.
• Adjustable receive buffer timeout.
• Enhanced bit-bang Mode interface option with RD# and WR# strobes.
• New synchronous bit-bang mode interface option with RD# and WR# strobes.
• New Multi-Protocol Synchronous Serial Engine (MPSSE) interface option.
• New CPU-style FIFO interface mode option.
• New MCU host bus emulation mode option.
• New fast opto-Isolated serial interface mode option
• High I/O pin output drive option.
• Interface mode and USB Description strings configurable in external EEPROM.
• EEPROM Configurable on board via USB
• Support for USB suspend and resume conditions via PWREN#, and SI/WU pins.
• Support for bus powered, self powered, and high power bus powered USB configurations.
• Integrated power-on-reset circuit, with optional reset input and reset Output pins.
• 5V and 3.3V logic I/O Interfacing with independent level conversion on each channel.
• Integrated 3.3V LDO regulator for USB I/O
• Integrated 6MHz – 48Mhz clock multiplier PLL
• USB Bulk data transfer mode.
• 4.35V to 5.25V single supply operating voltage range.
• Low operating and USB suspend current.
• UHCI / OHCI / EHCI host controller compatible.
• USB 2.0 Full Speed (12 Mbits / Second) compatible.
• Extended -40°C to 85°C industrial operating tem perature range.
• Compact 48-LD Lead Free LQFP package
• FTDI’s royalty-free VCP and D2XX drivers eliminate the requirement for USB driver development in most cases.
• Dedicated Windows DLLs available for USB to JTAG, USB to SPI, and USB to I2C applications.

Typical Applications
• USB to Dual Port RS232 Converters
• USB to Dual Port RS422 / RS485 Converters
• Upgrading Legacy Peripheral Designs to USB
• USB Instrumentation
• USB JTAG Programming
• USB to SPI Bus Interfaces
• USB Industrial Control
• Field Upgradable USB Products
• Galvanically Isolated Products with USB Interface
• USB to synchronous serial interface
• Cellular and cordless phone USB data transfer cables and interfaces.
• Interfacing MCU / PLD / FPGA based designs to USB
• USB Audio and Low Bandwidth Video data transfer
• PDA to USB data transfer
• USB Smart Card Readers
• USB Instrumentation
• USB Industrial Control
• USB MP3 Player Interface
• USB FLASH Card Reader / Writers
• Set Top Box PC - USB interface
• USB Digital Camera Interface
• USB Bar Code Readers