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CY4665 - Cypress & UPEK Reference Design for USB Flash Drives (UFD) | Cypress Semiconductor

CY4665 - Cypress & UPEK Reference Design for USB Flash Drives (UFD)

Last Updated: 
May 18, 2021

CY4665 Chip

The CY4665 "Flisk" reference design from Cypress and UPEK provides customers with a turnkey solution for USB flash drives (UFD) with fingerprint authentication security for conveniently protecting data and enabling authentication services.  The reference design utilizes UPEK's TouchStrip Fingerprint Authentication Solution (TCS3 swipe fingerprint sensor and TCD42 security ASIC), the only match-on-chip fingerprint authentication solution available on the market.   This complete biometric module securely performs all biometric processes including storage and matching in dedicated hardware rather than exposing data to a less secure host PC environment.  Cypress' EZ-USB(R) NX2LP-Flex programmable NAND flash controller, the only 8051 based programmable NAND controller on the market, interfaces with both the UPEK TCD42 security ASIC and the NAND flash to provide a secure link to both the PC and the flash.  UPEK's unique security ASIC also enables authentication services by securing communication with remote servers via AES/DES encryption.


Protector Suite Token, UPEK's bundled application software, enables users to gain access to all of their password-protected websites and applications with the simple swipe of a finger.  Since the software runs on the NAND flash and requires no additional drivers or software, users can enjoy true portability and access their favorites on the go.


The following features are included in the Cypress/UPEK CY4665 "Flisk" reference design solution:

  • Portable plug-and-play solution - All software runs on the flash drive
  • Match-on-chip provides user authentication with the highest level of security and privacy protection
  • Full-featured Protector Suite Token software suite from UPEK offers security that's easy-to-use:
    • Flash drive biometric lock -Protect access to sensitive data with the simple swipe of a finger
    • PC login - Log in to PCs at the Windows level more securely and conveniently than using just a password 
    • Password Bank - Securely register and access password-protected websites and applications by swiping your finger
    • Interactive tutorial and user training feedback - The integrated UPEK enrollment tutorial offers video training and a practice session with performance feedback to ensure the highest quality enrollment. This results in a satisfying user experience and improved security due to high-quality templates.
  • SDK available from UPEK for 3rd party application software development
    • Unique chipset architecture capable of encrypting communication enables authentication services applications

Cypress's High-Speed USB family is uniquely positioned to support a wide array of multi-function applications capable of supporting today's USB 2.0 requirements for USB flash drives (UFD); this reference design is targeted to the high-performance of EZ-USB(R) NX2LP-Flex (CY7C68033).


Designing with UPEK is designing with an industry leader in biometrics!

Hardware Description

The reference design includes:

  • Schematic (Orcad)
  • Firmware (NX2LP-Flex)
  • User Design Notes
  • Bill of Materials (BOM)
  • UPEK Design Documentation

Interested parties can request complete PCB gerber files, ready for manufacturing, by sending your company name and contact information to and a UPEK representative will contact you.


Software Description


Protector Suite Token software biometrically protects data and networks for users of portable devices and allows users to access protected information with the touch of a finger anywhere. Flash drives and external hard drives leverage Protector Suite Token software to encrypt files and folders and to replace login names and passwords for Windows operating systems, corporate VPNs, and access to web accounts such as email, banks and credit cards. Replacing passwords with fingerprint biometrics improves security since passwords can be lost or stolen, and users enjoy freedom from memorizing passwords. Protector Suite Token software is unique in enabling true portability - the software doesn't need to be installed on a host computer so that users can take their secure access anywhere.


Design Support


For questions or technical support regarding the CY4665 Cypress/UPEK solution, please contact UPEK at