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This may seem like a lot (especially when you phrase it as a margin of 1 percent out of speci cation), but in actual terms, it actually isn t. In the preceding example application, the margin is really only 1 percent of the total clock s accuracy. To properly qualify an application, you may have to understand the error distribution of the clock circuits to ensure that nothing is shipped that is this far out of tolerance. Another solution that would be part of the quali cation plan is to ensure that a margin check is included in the application test. Application test is something that is near and dear to my heart (mostly because I have spent almost all of my professional life ensuring that products work correctly). In the preceding list of quali cation items, I noted that the test should be for all functional aspects of an application. If you ve worked around electronic circuits for any length of time, you know that this is almost always impossible because there are so many different ways in which a circuit can fail. The important point to make about test is that they ensure that the application will respond correctly to the expected inputs. There will be cases when unexpected inputs will be received (such as when the application connection is jostled or the circuit is zapped by static electricity), and these are hard to plan for. You should have a good idea of how the application works under normal operating conditions and be able to test these conditions. It probably seems surprising that I have included a reliability calculation here especially since you are probably planning that your rst applications are going to turn on an LED based on a button s input. I will not go into reliability calculations in this book, but if you are going to develop an application for a commercial product, then you probably will want to do the calculations and even test out the application in an accelerated life test to make sure that your calculations are correct. Reliability quali cation is not something that many companies worry about, and with the ruggedness of modern components, it is not perceived as being a critical factor to a product s success. Personally, I believe that testing the reliability of a product is the most important indicator of the quality of the design and the quality of the components used. Admittedly, reliability testing can add signi cant costs to a product, but it can keep you from unhappy customers and lawsuits if your product fails prematurely. Environmental quali cation is simply ensuring that the product will run reliably in the location where it is expected to operate. Obviously, for most of the applications presented here, this is not a concern because the circuits will be run on a bench or in a home or of ce environment. Part of environmental testing is ensuring that the application does not radiate excessive noise. For products to be sold commercially, they will have to be FCC class B or BABT certi ed. Many applications work in extremes of voltage, electrical noise, vibration, temperature, or humidity. Along with this, the applications may be sealed into a package and end up being heated by the circuits used within them. If any environmental extremes are expected, then the product should be tested and quali ed for these environments and the reliability calculations done to make sure that the product will operate for its required lifetime. Many of the environments in which circuits are used will require testing to industry or governmental speci cations. For example, if your application was going to be placed
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