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Document Reference No.: FT_000120
USB to RS485 UART Serial Converter PCB Datasheet
Version 1.2
Clearance No. FTDI#80
3
Features of FT232R applicable to USB-RS485-PCB
The USB-RS485-PCB uses FTDI?s FT232RQ USB to serial IC device. This section summarises the key
features of the FT232RQ which apply to the USB-RS485-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 USB-
RS485-PCB 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 called FT_Prog,
which can be downloaded from the FTDI website (http://www.ftdichip.com/Support/Utilities.htm).
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 FT_Prog).
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-RS485-
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-RS485-PCB as a dongle for software licensing. Further to this, a renewable
license scheme can be implemented based on the FTDIChip- ID? number when encrypte d 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-RS485-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 ? 2011 Future Technology Devices International Limited
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