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USB-RS232-WE-1800-BT-0.0 Datasheet(PDF) 7 Page - Future Technology Devices International Ltd. |
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USB-RS232-WE-1800-BT-0.0 Datasheet(HTML) 7 Page - Future Technology Devices International Ltd. |
7 / 15 page ![]() Copyright © 2010 Future Technology Devices International Limited 6 Document Reference No.: FT_000077 USB TO RS232 SERIAL CONVERTER RANGE OF CABLES Datasheet Version 1.3 Clearance No.: FTDI# 51 4 Features of FT232R applicable to USB-RS232 Cables The USB-RS232 cables use FTDI’s FT232RQ USB to serial UART IC device. This section summarises the key features of the FT232RQ which apply to the USB-RS232 USB to serial RS232 converter cables. 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 in each cable is used to store USB Vendor ID (VID), Product ID (PID), device serial number, product description string and various other USB configuration descriptors. Each cable is supplied with the internal EEPROM pre-programmed as described in Appendix A - Cable 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. (Note that during suspend mode, the current drawn by any customised cable application which uses the USB supply, should not exceed 2.5mA to remain USB compliant) Low USB Bandwidth Consumption. The USB interface of the FT232R, and therefore the USB-RS232 cables has been designed to use as little as possible of the total USB bandwidth available from the USB host controller. UART Pin Signal Inversion. The sense of each of the UART signals can be individually inverted by configuring options in the internal EEPROM. For example CTS# (active low) can be changed to CTS (active high), or TXD can be changed to TXD#. 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 cable 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-RS232 cables 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. Improved EMI Performance. The USB-RS232 cables are FCC and CE certified. Extended Operating Temperature Range - The USB-RS232 cables are capable of operating over an extended temperature range of -40º to +85º C thus allowing them to be used in automotive or industrial applications. |
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