Cypress EZ-USB FX2 PCB manual

1
2
3
4
5
6
7

Go to page of

A good user manual

The rules should oblige the seller to give the purchaser an operating instrucion of Cypress EZ-USB FX2 PCB, along with an item. The lack of an instruction or false information given to customer shall constitute grounds to apply for a complaint because of nonconformity of goods with the contract. In accordance with the law, a customer can receive an instruction in non-paper form; lately graphic and electronic forms of the manuals, as well as instructional videos have been majorly used. A necessary precondition for this is the unmistakable, legible character of an instruction.

What is an instruction?

The term originates from the Latin word „instructio”, which means organizing. Therefore, in an instruction of Cypress EZ-USB FX2 PCB one could find a process description. An instruction's purpose is to teach, to ease the start-up and an item's use or performance of certain activities. An instruction is a compilation of information about an item/a service, it is a clue.

Unfortunately, only a few customers devote their time to read an instruction of Cypress EZ-USB FX2 PCB. A good user manual introduces us to a number of additional functionalities of the purchased item, and also helps us to avoid the formation of most of the defects.

What should a perfect user manual contain?

First and foremost, an user manual of Cypress EZ-USB FX2 PCB should contain:
- informations concerning technical data of Cypress EZ-USB FX2 PCB
- name of the manufacturer and a year of construction of the Cypress EZ-USB FX2 PCB item
- rules of operation, control and maintenance of the Cypress EZ-USB FX2 PCB item
- safety signs and mark certificates which confirm compatibility with appropriate standards

Why don't we read the manuals?

Usually it results from the lack of time and certainty about functionalities of purchased items. Unfortunately, networking and start-up of Cypress EZ-USB FX2 PCB alone are not enough. An instruction contains a number of clues concerning respective functionalities, safety rules, maintenance methods (what means should be used), eventual defects of Cypress EZ-USB FX2 PCB, and methods of problem resolution. Eventually, when one still can't find the answer to his problems, he will be directed to the Cypress service. Lately animated manuals and instructional videos are quite popular among customers. These kinds of user manuals are effective; they assure that a customer will familiarize himself with the whole material, and won't skip complicated, technical information of Cypress EZ-USB FX2 PCB.

Why one should read the manuals?

It is mostly in the manuals where we will find the details concerning construction and possibility of the Cypress EZ-USB FX2 PCB item, and its use of respective accessory, as well as information concerning all the functions and facilities.

After a successful purchase of an item one should find a moment and get to know with every part of an instruction. Currently the manuals are carefully prearranged and translated, so they could be fully understood by its users. The manuals will serve as an informational aid.

Table of contents for the manual

  • Page 1

    November 21, 2002 Document No. 001-431 17 Rev . ** 1 EZ-USB FX2™ PCB Design Recommendations Introduction This application n ote presents recommendati ons for design- ing with the Cypress Semiconductor EZ-USB FX2™ compo- nent. T echniques for high-speed desi gn should be applied to circuits using the EZ-USB FX2. Du e to the packaging and high pe[...]

  • Page 2

    November 21, 2002 Document No. 001-431 17 Rev . ** 2 AN1 196 Figure 2. FX2 Eye Diagram of High-speed Signali ng In the diagram, notice how no signal traces overlap the cen- tral, six-sided, shade d area. Also, no trace overlaps the extremes of permissible volt age as shown in the shaded lin es at the very top and very bottom of the figure. Overlap [...]

  • Page 3

    November 21, 2002 Document No. 001-431 17 Rev . ** 3 AN1 196 Maint ain PCB T race Impedance Designing the PCB traces for particular ch aracteristic imped- ance is very important to signal quality . The USB specification requires controlled impedance a mong all elements in the USB data path. The differential impedance of each USB data pair should be[...]

  • Page 4

    November 21, 2002 Document No. 001-431 17 Rev . ** 4 AN1 196 This figure shows the die lectric material thickness (“Prepreg”) between layers 1 and 2 and the thickness between layers 3 and 4. The dimensio ns between these layers are a key ele- ment in the design to se t the proper characteristic impedance for the USB data traces. This is the “[...]

  • Page 5

    November 21, 2002 Document No. 001-431 17 Rev . ** 5 AN1 196 The design of the land area fo r the expose d paddle is critical to proper thermal transfer . A copper fill is to be designed into the PCB and under the QFN in order to assist thermal trans- fer . Fig ure 5 is the diagram of the PCB land area for the EZ- USB FX2. Figure 5. Diagram of the [...]

  • Page 6

    November 21, 2002 Document No. 001-431 17 Rev . ** 6 AN1 196 EZ-USB FX2 Assembly Recommenda- tions The solder stencil over the expos ed p addle is required to per- mit at least 50% solder application coverage. Figure 8 is a graph from Amkor research showing how solder void mu ch less than 50% has little influe nce on thermal transfer . The package [...]

  • Page 7

    AN1 196 Cypress Semico nd uctor 198 Champi on Cou rt San Jose, CA 9513 4-1709 Phone: 408- 943-2600 Fax: 408-94 3-4730 http://www.cypr ess.com © Cypress S emiconductor Corpora tion, 2002-2007. The information containe d herein is subjec t to change with out notice. Cypres s Semiconductor Corporation a ssumes no resp onsibility for t he use of an y [...]