c# create barcode image 10: Hardware Design in Objective-C

Drawer QR Code 2d barcode in Objective-C 10: Hardware Design

CHAPTER 10: Hardware Design
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such as the dual inline package (DIP), plastic leaded chip carrier (PLCC), ball grid array (BGA), and the quad flat no lead (QFN), as shown in Figure 10 10.
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Figure 10 10. Some IC package types
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I could go on and on about when you should use one type over another, but as an accessory developer you ll more than likely end up using the DIP and QFN types. When you start to route your connections, if you choose to do it yourself, focus on the DIP and QFN pin diagrams in your spec. Why DIP and QFN you ask A DIP part is easy to handle and design for. The pins are exposed and available, so it can be easy to mod (modify or change) a circuit even after the board has been created. Use DIPs to test your design concepts in the early stages, if you can afford it. It s not that DIPs are higher cost, in fact, just the opposite. But, by fabricating (making) test circuits and boards, you ll be doing at least twice the work. Why do twice the work By doing twice the work, you re not doing four, five, or ten times the work. By creating a test circuit that you can have access to the circuit traces and IC pins, you can make changes and get it right so that the next board you send in to be made is correct. On the other hand, if you use parts and create boards that cannot be easily modified, changing your design means fabricating the board again. Every change might require an extra fabrication cycle, and every fabrication cycle is time and money. The reason for using QFN parts in your project is because that s how most parts for this level (complexity) of design are made. Since you ll be using parts that have fewer than about fifty pins, QFN will be the package of choice. The QFN package is designed as a good balance between spacing saving characteristics (note that there are no pins that visibly extend from the package) and cost.
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CHAPTER 10: Hardware Design
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The final piece of the circuit design step will be creating an electronic representation of your accessory in some sort of tool. The de facto standard EDA (electronic design automation) tool is the Cadence/OrCad suite. Not a single product, but a set of individual tools loosely coupled together, the Cadence suite is the most widely used product for circuit and PCB design. Should you wind up hiring someone to convert your design, there s a high probability he ll be using the Cadence suite. If you want to try and do it yourself, start with one of the low-cost, quick-turn (quick turnaround time) houses such as ExpressPCB. I found ExpressPCB after researching various electronics and robotics hobbyist sites. Companies like ExpressPCB usually offer a free tool that you can download and use to create your schematic design. The process of going from an idea or hand drawn circuit is known as schematic capture. You re capturing your design from paper (or thought) into an electronic format. You perform schematic capture graphically by picking your parts and then connecting the lines, as shown in Figure 10 11. Depending on the capability of the tool you use, you may have to create parts to put in your design library. This means that you ll use the part specification to create a block and all the necessary pin connections to represent your part. Common parts, such as the PIC series of microcontrollers, may already be in the library for you to click and drag your part to the drawing area. As with anything, the more it costs, the more it will probably do for you.
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Figure 10 11. Schematic capture (courtesy Altium Limited)
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In between the all-encompassing Cadence suite and freebies on the web, are a series of tools that offer a good balance for the occasional user. They provide everything necessary from schematic capture, PCB layout, simulation, and production support.
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