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For example, the serial number can be read and combined with date and time data, perhaps to
represent a registration or license expiration date. All of this information can then be encrypted and
stored within the EEPROM User Area. Application software can then decrypt this information to
determine the date stored in the EEPROM and can compare the decrypted serial number with the
unchangeable serial number to confirm that an end user has not modified the EEPROM User Area.
3.0 EEPROM USER AREA SIZE
The integrated EEPROM is 1024 bits (128 bytes) in size. The length of the serial number and
description strings programmed into the EEPROM determine the amount of the EEPROM User Area
available for use by user application software. If these strings are long, there may not be enough User
Area available in which to store the encrypted data required. (The USB driver function FT_EE_UASize
returns the size of the User Area in bytes and can be used to determine if the required space is
available before attempting to write data to the EEPROM.)
A remaining User Area of 40 bytes is typical for the DLP-D as shipped from DLP Design.
4.0 DEMONSTRATION SOFTWARE
Demonstration software written in both Visual C++ and Visual Basic are available for free download
with purchase of the DLP-D Dongle. They demonstrate how to read the serial number, read from and
write to the User Area, and determine the User Area’s size.
5.0 MECHANICAL DIMENSIONS IN INCHES (MM): PRELIMINARY
0.34 typ
(8.7 typ)
Top
Bottom
Insert
Area
2.00 typ
(50.8 typ)
Insert Areas:
0.77 x 0.58 typ
(19.53 x 14.78 typ)
0.69 x 0.58 typ
(17.63 x 14.78 typ)
0.82 typ
(20.8 typ)
Rev. 1.2 (March 2007)
2
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DLP Design, Inc.
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