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Document Reference No.: FT_000062
USB-Key Datasheet Version 1.00
Clearance No.: FTDI# 41
2
FTDI USB KEY User Guide
The following illustration, Figure 2.1 , shows a representation of the FTDI USB Key unit. The user interface is
described below.
Figure 2.1 FTDI USB Key Illustration.
2.1 USB Connection
The FTDI USB Key module connects to a USB hub or host port via the USB connector. This will
supply power to the FTDI USB Key.
2.2 Reading The FTDIChip-ID? USB Key
The unique FTDI USB Key FTDIChip-ID? number can only be read using function calls from
the FTDChipID.dll. This DLL can be downloaded from the FTDI website for Windows (V1.1.0),
Linux (V0.1.0) and Mac OS X (V0.1.0). The D2XX drivers must also be installed. The drivers
can be downloaded from http://www.ftdichip.com/Drivers/D2XX.htm
The FTDChipID.dll and the D2XX.dll can reside in the same directory.
An FTDIChip-ID? programmer's guide gives details of how to use the DLL and is available
from the http://www.ftdichip.com/Documents/ProgramGuides.htm page. The programmers
guide lists the function calls which need to be used by the software application to identify the
unique FTDIChip-ID? number.
2.3 Basic Description of the FTDIChipID Function calls
The following list gives a brief description of the function calls available in order to obtain the
FTDIChip-ID? number when using the FTDChipID.dll
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FTID_GetNumDevices - returns the number of devices attached on the USB bus.
FTID_GetDeviceSerialNumber - Given a device index return the device serial number.
FTID_GetDeviceDescription - Given a device index returns with description of the
device.
FTID_GetDeviceLocationID - Given a device index returns with location ID.
FTID_GetDeviceChipID - Given a device index returns the unique FTDIChip-ID?
number of the device.
FTID_GetChipIDFromHandle - Given a device handle returns the unique FTDIChip-ID?
(must use a valid D2XX device handle).
FTID_GetDllVersion - get the dll version.
FTID_GetErrorCodeString - get the English translation of the error code.
Copyright ? Future Technology Devices International Limited
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