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Document Reference No.: FT_000119
USB TO RS422 UART SERIAL CONVERTER PCB
Datasheet
Version 1.02
Clearance No.: FTDI#79
3
Features of FT232R applicable to USB-RS422-PCB
The USB-RS422-PCB uses FTDI’s FT232RQ USB to serial IC device. This section summarises the key
features of the FT232RQ which apply to the USB-RS422-PCB. For further details, and a full features and
enhancements description consult the FT232R datasheet, this is available from www.ftdichip.com.
Internal EEPROM. The internal EEPROM is used to store USB Vendor ID (VID), Product ID (PID), device
serial number, product description string and various other USB configuration descriptors. Each FT232RQ
is supplied with the internal EEPROM pre-programmed as described in Appendix A - PCB EEPROM
Configuration . The internal EEPROM descriptors can be programmed in circuit, over USB without any
additional voltage requirement. It can be programmed using the FTDI utility software called MPROG,
which can be downloaded from FTDI Utilities on the FTDI website (www.ftdichip.com). Additionally, there
is a user area of the internal EEPROM available to system designers to allow storing of data (note that
this is not modified by MPROG).
Lower Operating and Suspend Current. The FT232R has a low 15mA operating supply current and a
very low USB suspend current of approximately 70μA.
Low USB Bandwidth Consumption. The USB interface of the FT232R, and therefore the USB-RS422-
PCB has been designed to use as little as possible of the total USB bandwidth available from the USB host
controller.
FTDIChip-ID?. The FT232R includes the new FTDIChip-ID? security dongle feature. This FTDIChip-ID?
feature allows a unique number to be burnt into each FT_232RQ during manufacture. This number cannot
be reprogrammed. This number is only readable over USB can be used to form the basis of a security
dongle which can be used to protect any customer application software being copied. This allows the
possibility of using the USB-RS422-PCB as a dongle for software licensing. Further to this, a renewable
license scheme can be implemented based on the FTDIChip-ID? number when encrypted with other
information. This encrypted number can be stored in the user area of the FT232R internal EEPROM, and
can be decrypted, then compared with the protected FTDIChip-ID? to verify that a license is valid. Web
based applications can be used to maintain product licensing this way. An application note, AN232R-02,
available from FTDI website (www.ftdichip.com) describes this feature.
Extended Operating Temperature Range - The USB-RS422-PCB is capable of operating over an
extended temperature range of -40o to +85oC thus allowing it to be used in automotive or industrial
applications.
Copyright ? 2009 Future Technology Devices International Limited
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