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AN901 Datasheet(PDF) 2 Page - STMicroelectronics |
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AN901 Datasheet(HTML) 2 Page - STMicroelectronics |
2 / 14 page 2/14 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) 2 |
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