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Using a quartz crystal is the most popular option. These are widely available and work without any problems. They require two additional capacitors and recommended values are between 22 pf and 33 pf to help start oscillations. The quartz crystals have a high Q (of the order of 10000 or more) and it takes some time for the oscillations to build up. This time is called start-up time and is of the order or 5 ms to 20 ms. Figure 5.7 illustrates how to connect a quartz crystal to the oscillator pins of the AVR processor. If the clock signal is required for an external device, up to 1 HC type buffer or an inverter can be connected to the X2 pin of the processor. When using an external crystal or resonator and in case of oscillation start-up problems, the oscillator start-up time should be investigated. Figure 5.8 illustrates the oscillator start-up time when power is applied to the AVR processor. The start-up time in this case is about 20 ms.

Density variations can indicate a larger distribution of underfill mechanical and physical properties, which may affect long-term reliability performance of the solder joints Quantitative image analysis can be coupled into SAM and x-ray analysis data to provide valuable process control tools for the factory floor..

R. Boulanger is acknowledged for contributions to this chapter, which is based on Assembly Processes, Printed Circuits Handbook, 5th ed., Clyde E. Coombs (ed.), 2001, Chap. 40. The author also wishes to thank M. Dvorack of Sandia National Laboratories for his careful review of the chapter.

Fig 748: Influence of the number of jets on the load coefficient [3]

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Once a circuit card assembly (CCA) has been fully assembled and tested, it often needs to be protected from the environments in which it will ultimately be used. Moisture, salt, dirt, fungus, and a variety of other contaminants as well as mechanical shock and vibration will cause failure on an unprotected assembly. The CCA s last line of defense against the elements is a thin layer of coating that conforms to the shape of all the part leads, solder joints, and other complex features on the completed CCA. This conformal coating (or flow coating) is applied as liquid to the fully assembled CCA, and is cured in place to form a protective layer of insulation for the assembly. This chapter presents:

An overview of the five basic conformal coating types Preparatory steps necessary to ensure a successful coating process Various methods of applying conformal coating Repair and rework processes Design guidance on when and where coating is required, and which physical characteristics and properties are important to consider

41.1.1 Objectives and Applications for Conformal Coatings Besides protecting the CCA from the elements, conformal coating also provides:

Mechanical support for components during mild shock and vibration Electrical insulation for high-voltage components, especially at altitude Chemical resistance Prevention of short circuits due to tin whisker growth from pure tin-plated part leads and cases

FIGURE 5.8 Oscillator start-up using a parallel resonant crystal after the supply input is applied to the processor.

Figure 748 shows the influence of dispersion and of the number of jets per row upon the bearing load capacity The two curves in the figure represent the theoretical work of Dudgeon and Lowe and the experimental data from the work of Robinson and Sterry The reduction in the load capacity due to the effect of dispersion reduces as the number of jets increases The two curves are quite identical especially when there are a higher number of jets per row The load capacity falls rapidly at a low number of jets due to dispersion, as a result of which most practical designs use between six and 12 jets per row, with more jets for low length-to-diameter ratios The increase in clearance for these bearings is compensated by increasing the number of jets without having to increase the diameter of the bearing The influence of non-axial flow in determining the choice of length-to-diameter ratio, and the position of the rows of jets is shown in Figure 749 and Figure 750 Figure 749 indicates the relationship between the jet position and the load coefficient It can be seen that the highest load coefficients are realized when the rows of jets are stationed between a quarter and one-eighth of the

Because of the extra cost involved with the cleaning, coating, curing, and touchup operations, conformal coating was usually reserved only for equipment that required high reliability, such as military and aerospace electronics, and equipment that needed to operate in severe environments. With the introduction of automated application robots and ultraviolet (UV) curable chemistries, conformal coating has become more common.

Overview of Types of Conformal Coatings Conformal coating materials are available in five basic chemistries, each with multiple application methods and several drying/curing options. As such, no one material will fit every application, but the wide variety will allow the designer to select a material that meets most technical, budgetary, and manufacturing needs. The various coatings and their characteristics are summarized in Table 41.1. The five basic chemistries are:

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