AN2344 Freescale Semiconductor / Motorola, AN2344 Datasheet - Page 2

• Manufacturer Part Number: AN2344
• Description: HC908EY16 EMI Radiated Emission Results
• Manufacturer: Freescale Semiconductor / Motorola

AN2344/D
SAE J1752/3 Radiated Emissions Testing
2
The remainder of this document covers a set of EMI radiated emissions tests
performed in accordance with the SAE J1752/3 specification J1752/3
“Electromagnetic Compatibility Measurement Procedure for Integrated Circuits
– Integrated Circuit Radiated Emissions Measurement Procedure 150 kHz to
1000 MHz, TEM Cell”. A complete description of test equipment, setup, and
procedure can be found in the Motorola document “Electromagnetic
Compatibility Qualification and Analysis of Microcontrollers (100 kHz – 1 GHz)
Test Methods and Procedures.”
The goal of the testing was to document the electromagnetic emissions spectra
of the HC908EY16 (mask set 0L31N) at device level. Testing was carried out
using two different configurations. Firstly, the external crystal option was tested
with an 8MHz crystal being used to generate a bus frequency of 2MHz. The
same test PCB was then used to carry out the testing using the Internal Clock
Generator (ICG) module to generate a bus frequency of 2MHz. It should be
noted that when the ICG configuration was used, the external crystal and
related components had been removed from the test PCB. In each case,
measurements were taken with the software being executed out of flash
memory and with a supply voltage of 5V.
Freescale Semiconductor, Inc.
HC908EY16 EMI Radiated Emissions Results
For More Information On This Product,
Go to: www.freescale.com
MOTOROLA