FT2232C 查看數據表（PDF） - Future Technology

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FT2232C

FT2232D Dual USB UART / FIFO I.C.

Future Technology 

• EEPROM Interface

When used without an external EEPROM the

FT2232D be configured as a USB to dual serial

port device. Adding an external 93C46 (93C56

or 93C66) EEPROM allows each of the chip’s

channels to be independently configured as

a serial UART (232 mode), or a parallel FIFO

(245 mode). The external EEPROM is used to

enable the Fast Opto-Isolated Serial interface

mode. The external EEPROM can also be used

to customise the USB VID, PID, Serial Number,

Product Description Strings and Power Descriptor

value of the FT2232D for OEM applications.

Other parameters controlled by the EEPROM

include Remote Wake Up, Isochronous Transfer

Mode, Soft Pull Down on Power-Off and USB 2.0

FT2232D Dual USB UART / FIFO I.C.

descriptor modes.

The EEPROM should be a 16 bit wide

configuration such as a MicroChip 93LC46B or

equivalent capable of a 1Mb/s clock rate at VCC =

4.35V to 5.25V. The EEPROM is programmable-

on board over USB using a utility program

available from FTDI’s web site (www.ftdichip.

com). This allows a blank part to be soldered

onto the PCB and programmed as part of the

manufacturing and test process.

If no EEPROM is connected (or the EEPROM

is blank), the FT2232D will default to dual serial

ports. The device use its built-in default VID, PID

Product Description and Power Descriptor Value.

In this case, the device will not have a serial

number as part of the USB descriptor.

DS2232D Version 0.91

© Future Technology Devices International Ltd. 2006 Page  of 51

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