Emi Measurement For Lx16-Family - Fujitsu F2MC-16LX Series Application Note

7. EMI Measurement for LX16-family

Spectrum analyzer
0.1-1000MHz
IEEE
Workstation
Figure 10: Measuring setup
PLL CKSCR
16 MHz 0xBB
12 MHz 0xBA
8 MHz 0xB9
4 MHz 0xB8
2 MHz 0xDC
Table 1: CKSC- settings for several PLL frequencies
Port Function
port x0 output
port x1 output
port x2 output
port x3 input
port x4 output
port x5 output
port x6 output
port x7 input
Table 2: I/O port settings for toggle test
Probe Pin
GND GND
GND1 DVSS
GND2 VSS
GND3 AVSS
Table 3: Ground measurement with 1ohm probe
Schirmbox
RS232
Remarks
default after reset
PLL disabled
I/O-State
high
low
2 kHz toggling
-
high
low
2 kHz toggling
-
Remarks
common ground
oscillator/ext. bus
I/O-ground
analog ground
Vdd
10Ai
Vss
10Ai
X-TEM Ferrit
Filter
+
Power supply
5V
-
Filter
11