Emi design issues, Heme illustrated in figure 4.4 and discussed belo, Figure 4.4 – Echelon FT 3150 Smart Transceiver User Manual
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Chapter 4 - Hardware Design Considerations
98
FT 3120 / FT 3150 Smart Transceiver Data Book
Figure 4.4 Star Ground Design
EMI Design Issues
The high-speed digital signals associated with microcontroller designs can generate unintentional electromagnetic
interference (EMI). High-speed voltage transitions generate RF currents that can cause electromagnetic radiation
from a product if a length of wire or piece of metal serves as an antenna.
Products that use a FT Smart Transceiver will generally need to demonstrate compliance with EMI limits enforced by
various regulatory agencies. In the USA, the FCC requires that unintentional radiators comply with Part 15 level “A”
for industrial products, and level “B” for products that can be used in residential environments. Similar regulations
are imposed in most countries throughout the world.
S t a r G r o u n d
C e n t e r
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I / O B l o c k
P o w e r
S u p p l y
B l o c k
S m a r t
T r a n s c e i v e r
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D 2
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