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AVR040: EMC Design Considerations

From Atmel Corporation

This application note covers the most common EMC problems designers encounter when using microcontrollers. It will briefly discuss the various phenomena. The reference literature covers EMC design in more detail, and for designers who are going to build products that need to be EMC compliant, further study is highly recommended. A good EMC design requires more knowledge than what can be put into a short application note.

Unlike many other design issues, EMC is not an area where it is possible to list a set of rules. EMC compliance cannot be guaranteed by design; it has to be tested. It is recommended that readers unfamiliar with EMC design read this document more than once, as some of the subjects described early in this document are more easily understood if the reader has already read the rest of the document.

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Smart Card Chips
Smart card chips contain a microprocessor and/or memory. They are embedded in smart cards; portable devices that resemble credit cards but are used in applications such as banking and health care.
Digital Signal Processors (DSP)
Digital signal processors (DSPs) are specialized microprocessors designed specifically for digital signal processing, usually in real-time. DSPs can also be used to perform general-purpose computations, but are not optimized for this function.
Microcontrollers (MCU)
Microcontrollers (MCU) are complete computer systems on a chip. They combine an arithmetic logic unit (ALU), memory, timer/counters, serial port, input/output (I/O) ports and a clock oscillator.
Microprocessor Chips (MPU)
Microprocessor chips (MPU) are silicon devices that serve as the central processing unit (CPU) in computers. They contain thousands of electronic components and use a collection of machine instructions to perform mathematical operations and move data from one memory location to another.
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