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EMC GUIDELINES FOR MICROCONTROLLER-BASED APPLICATIONS

1 DEFINITION OF TERMS

Electromagnetic compatibility (EMC) is the capacity of a piece of equipment to work properly

in its normal environment, and not create electrical disturbances that would interfere with other

equipment.

Electromagnetic susceptibility (EMS) is the level of resistance to electrical disturbances such

as electromagnetic fields and conducted electrical noise.

Electromagnetic interference (EMI) is the level of conducted/radiated electrical noise created

by the equipment.

There exists several standards addressing EMS or EMI issues, and for every type of applica-

tion area. These standards apply to finished equipment. Up to now, there is no official

standard applicable to sub-systems or electronic components. Nevertheless, EMC tests must

be performed on the sub-systems in order to evaluate and optimize applications for EMC per-

formances.

1.1 EMC STANDARDS

Table 1. Electromagnetic Emissions

Table 2. Electromagnetic Susceptibility

STANDARD

EQUIVALENT

INTERNATIONAL STANDARD

DESCRIPTION

EN50081-1

Generic emissions standards - Residential

EN50081-2

Generic emissions standards - Industrial

EN55011

CISPR 11

For industrial, scientific and medical equipment

EN55013

CISPR 13

For broadcast receivers

EN 55014

CISPR 14

For household appliances/tools

EN 55022

CISPR 22

For data processing equipment

SAE 1752/3

American Measurements Procedure for susceptibility

STANDARD

EQUIVALENT

INTERNATIONAL STANDARD

DESCRIPTION

EN50082-1

Generic immunity standards - Residential

EN50082-2

Generic immunity standards - Industrial

EN50140

IEC 1000-4-3

(old nb: IEC 801-3)

RFI (radiated test)

(80 MHz - 1 GHz at 1 to 10 V/m)

EN50141

IEC 1000-4-6

(old nb: IEC 801-6)

Induced RF fields (conducted test)

(150 kHz - 80 MHz at 1 to 10V (80% AM, 1 kHz))

EN50142

IEC 1000-4-5

(old nb: IEC 801-5)

Surge

EN????

(TBD)

IEC 1000-4-4

(old nb: IEC 801-4)

EFT / Burst

(250V - 2kV I/O lines; 0.5 - 4kV AC/DC mains)

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