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Figure 1.36 Chip-on-board packaging consisting of a chip wire bonded directly to a PCB with a glob top of encapsulant placed over it for protection.
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rst method is to place the chip on the card and wire the pads of the chip to the pads on the card using the same technology as wiring a chip to its lead frame inside a package. This is done using small aluminum wires ultrasonically welded to the chip and raw card. Fig. 1.36 gives you an idea of what this looks like. The other method of COB is known as C4 and is actually very similar to the SMT process described above but with the chip being soldered directly to the PCB rather than a plastic package. Pads on the chips have small solder balls (called bumps) attached to them that are soldered to matching pads on the PCB. This technology was originally developed by IBM for attaching chips to ceramic substrates or backplanes without having to go through a wire-bonding step. It requires a signi cant investment in tools for placement as it is a specialized process used in applications where PCB real estate is at a premium and the application is not expected to experience signi cant thermal extremes.
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When the rst computers were created over 60 years ago, machine instruction programs were written by hand, converted to instruction bits, and manually loaded into the computer ROM. ROM in the rst computers consisted of large banks of switches, and setting them correctly for a speci c program was a pretty onerous task. The application development process was tedious and had to be done very carefully to prevent an error creeping that would take hours to recognize, nd, and x. Today, there is a certain irony that computers have taken over many of these tasks and in doing so have eliminated many problems, making the application development process much faster and easier. The applications that provide these functions were originally designed as stand-alone programs but have recently been packaged together into a single program known as an integrated development environment (IDE), which eliminates almost all of the manual effort needed to develop a computer application. The rst tool you will have to be familiar with is an editor, which will allow you to create the program source code. The source code is the human-readable le that contains the instructions (either as assembly or high level language) that are to be processed into the bits executed by the processor. There is a plethora of different editors available, ranging from simple line editors (such as the MS-DOS Edlin program) to very sophisticated programmer s editors that automatically insert programming text in speci c
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formats for you and will check the code over for errors. Personally, I believe that the choice of editor isn t that important, although I would suggest that you use one with the same Ctrl codes as standard Windows editors to minimize the possible confusion between cut-copy-paste-undo in different programs. With the program stored in a text le from the editor, it must be converted or built into an object le that can be loaded into the processor. The most basic conversion program is the assembler, which converts processor instructions into the bits required to execute by the processor. Even though I used the term most basic to describe the assembler, the program has more sophisticated features and capabilities than you would expect from something that works with the basic machine instructions. The input to the assembler is a text le and it produces a number of les, including a listing le (containing a printout of the program and system generated comments and the instruction codes) and an object code le (which contains the straight program bit information for loading into the processor). There are also les to help with program debugging or loading into the processor. Most assemblers are described as being two pass, which means they read through the program once to check the instructions and identify labels with addresses and again to associate the addresses with the different instructions. Compilers convert high level languages into object code les in a similar manner to the assembler. Like the assembler, the compiler also outputs object, listing, debug, and loading les. Compilers may also output an assembler le, which will allow you to look at the instructions that are needed to implement a given high level statement an excellent way to see how assembly language programming is done to accomplish speci c tasks. There are two types of object code les produced by compilers and assemblers for use in embedded microcontrollers. The .hex le is an application le that has the complete data to be loaded into the microcontroller. The .obj le will have to be linked to other les or libraries (collections of standard functions) to create the .hex application le. The .hex le is the nal form of the object code and is used by the programmer that loads the microcontroller s program memory. There are three ways to test the operation of the application code in an embedded microcontroller: a simulator, a debugger, or an emulator. The simulator is a program that simulates the operation of the microcontroller and its I/O on a PC so you can test your application before loading it into a chip. A debugger consists of devoted I/O pins on an embedded microcontroller chip that interfaces to PC-based software that allows execution monitoring and control. The debugger differs from an emulator, which makes the entire microcontroller accessible for monitoring program execution without devoting any I/O pins to interface with the controlling PC program. Each of these application test tools requires additional les from the assembler and compiler to provide a source code view of the program s execution to allow you to understand exactly where the program is executing and what it is doing. To summarize, the full collection of tools that are used to create a microcontroller application are:
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