AN901 Datasheet, PDF (2/14 Pages) STMicroelectronics – Electromagnetic compatibility

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
STANDARD
EN50081-1
EN50081-2
EN55011
EN55013
EN 55014
EN 55022
EQUIVALENT
INTERNATIONAL STANDARD
CISPR 11
CISPR 13
CISPR 14
CISPR 22
SAE 1752/3
DESCRIPTION
Generic emissions standards - Residential
Generic emissions standards - Industrial
For industrial, scientific and medical equipment
For broadcast receivers
For household appliances/tools
For data processing equipment
American Measurements Procedure for susceptibility
Table 2. Electromagnetic Susceptibility
STANDARD
EN50082-1
EN50082-2
EN50140
EN50141
EN50142
EN????
(TBD)
EQUIVALENT
INTERNATIONAL STANDARD
DESCRIPTION
Generic immunity standards - Residential
Generic immunity standards - Industrial
IEC 1000-4-3
(old nb: IEC 801-3)
RFI (radiated test)
(80 MHz - 1 GHz at 1 to 10 V/m)
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))
IEC 1000-4-5
(old nb: IEC 801-5)
Surge
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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