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Migrating From EZ-USB FX2™ to EZ-USB FX2LP™

of any circuitry other than circuitry embodied in a Cypress product. Nor does it convey or imply any license under patent or other rights. Cypress products are not warranted nor intended to be

used for medical, life support, life saving, critical control or safety applications, unless pursuant to an express written agreement with Cypress. Furthermore, Cypress does not authorize its

products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress

products in life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress against all charges.

Package Changes

Additional options have been made available in the

packaging of the FX2LP part. Additional configurations are

available in the 56-pin packages. These configurations allow

for two additional GPIO pins. These parts are the part number

CY7C68015A/CY7C68016A available in both a QFN and a

SSOP package. As in FX2, all FX2LP parts are available in

lead-free packages. The following table lists the FX2 parts

and the respective FX2LP part that may be used to replace

the FX2.

CY7C68014A and CY7C68016A are Ideal for battery

powered applications as they have an ultra-low suspend

current of 100 µA (typical). CY7C68013A and CY7C68015A

which have a low suspend current of 300 µA (typical) are

Ideal for non-battery powered (self or bus powered) applica-

tions.

Development Tool

The FX2LP has a development kit similar to that of the FX2.

The part number for this kit is CY3684. The development kit

for the FX2LP contains a development board, cables,

documentation and a development CD.

The CD has electronic copies of the Technical Reference

Manual, the data sheet, schematics and gerbers for the

development board, firmware examples, drivers

(CyUSB.sys), the USB Developer’s Studio control panel and

evaluation version of the Keil’s µVision2 Compiler. Items of

interest that a developer will want to use as references are:

•EZ-USB

Technical Reference Manual

• CY7C68013A/CY7C68015A data sheet

• CYStream–Streaming Over USB with Isochronous and

Bulk Transfers (P/N CY4603)

• USB Developer’s µ-Studio (P/N CY4604).

Redesigning an Existing FX2 Application to an

FX2LP Application

Following are the main items to consider while replacing the

FX2 in an existing application with an FX2LP part:

• Make sure to replace the crystal with the appropriate load

capacitors. The FX2LP requires a crystal with load capac-

itors of 12 pF.

• Is the existing FX2 application bus-powered and has the

double enumeration workaround for meeting the unconfig-

ured current limit of 100 mA? If so, set the control bit of the

EEPROM to 0 (chirp enabled). You may opt to either leave

in or remove the double enumeration workaround in the

firmware.

• Check the code location to make sure if the existing FX2

application uses memory mapped ROM (any non-volatile

memory) or memory mapped I/O within the address space

of 0x2000 to 0x3FFF. If so, they must be mapped to new

locations and the firmware should be relinked. In the limited

number of designs that require this change, just a logic

change to a FPGA or programmable logic array for hard-

ware memory decoding and changing the target location

of the external code within the compiler/linker is needed.

If the existing FX2 design has RAM at this location (0x2000

to 0x3FFF), no changes are required while replacing the

part with FX2LP.

• Does the FX2 application use high-bandwidth Isochronous

IN transfer? If so, does it have a workaround (on the host

end or the device end) for handling the possible occurrence

of a scenario of data PID mismatch: additional hardware,

external logic, or software on the host end to handle the

scenario? If so, you may consider removing the additional

logic/code as the FX2LP has resolved this data PID mis-

match issue. You may also choose to not remove the de-

signed workaround for ease of drop-in replacement with

FX2LP

Note that in general, when changing components such as the

USB controller (FX2 to FX2LP), the USB-IF will require the

certification test to be rerun. The USB controller and the

board traces will have the majority of the effects on the

electrical characteristics of the device and therefore the

USB-IF will require the device to be retested.

Conclusion

This application note has introduced the reader to the differ-

ences between the FX2 and the FX2LP. As discussed in this

application note, the only required change when using the

FX2LP in place of the FX2 is the alteration of the crystal load

capacitors and the load capacitance of the crystal. With

exception of the load capacitance on the crystal, the crystal

for the FX2LP contains the same requirements as that for the

FX2. Additional features are also highlighted, but are

defaulted to function as the FX2 would. This enables use of

FX2LP in prior designs with minimal or none at all changes to

the firmware. Due to the increased memory within the FX2LP,

a limited number of designs may require a memory map

change.

As with Cypress’s FX2, the FX2LP is made available with

world-class development tools and software support. Visit

www.cypress.com for more device details and data sheet

information.

EZ-USB is a registered trademark and EZ-USB FX2 and EZ-USB FX2LP are trademarks of

Cypress Semiconductor Corporation. All product and company names mentioned in this

document are the trademarks of their respective holders.

AN4078_A approved kkvtmp 1/31/05

EZ-USB FX2

Part Number

EZ-USB FX2LP

Part Number

Package

Description

CY7C68013-56PVC CY7C68013A-56PVXC or

CY7C68014A-56PVXC

56-pin

SSOP

CY7C68013-56LFC CY7C68013A-56LFXC or

CY7C68014A-56LFXC

56-pin QFN

CY7C68013-100AC CY7C68013A-100AXC or

CY7C68014A-100AXC

100-pin

TQFP

CY7C68013-128AC CY7C68013A-128AXC or

CY7C68014A-128AXC

128-pin

TQFP

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