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CARD-PCI/GX Hardware Manual
A.4 Cautions on artwork design
A.4.1 Power supply line
To stabilize voltages supplied to SCE8720C, place an appropriate decoupling capacitor
at each power supply line close to SCE8720C connector. Recommended values are
shown below.
Power supply line
V
-GND
CCCORE
V
-GND
CC5V
V
-GND
CC3V
V
-GND
CCSTB
V
CCBAK
*1: V
is input voltage of DC-DC converter which generates the core voltage (2.2V)
CCORE
of CPU. Although SCE8720C has a built-in capacitor, another capacitor is needed
on the system side as peak current flows anyway. Since the voltage is 5V, it is
possible to use the common power supply with V
flows as mentioned above, countermeasure such as use of separate power supply
line on the board is needed.
*2: In order to avoid variation of voltage when accessing HDD or CompactFlash, put a
capacitor of required value to V
*3: 0.5 to 1 ceramic capacitor per IC is recommended.
76
Type of capacitor
220µF - 10V electrolytic capacitor
0.01µF ceramic capacitor
220µF - 10V electrolytic capacitor
0.01µF ceramic capacitor
100µF - 10V electrolytic capacitor
0.01µF ceramic capacitor
10µF - 10V electrolytic capacitor
0.01µF ceramic capacitor
1µF laminated ceramic
CC5V.
EPSON
Quantity
1
(*1)
2
1
(*2)
Large quantity (*3)
1
Large quantity (*3)
1
2∼
(*3)
1
. However, as peak current
CC5V
Rev.A
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