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A.3 Power supply design: Power control circuit
Standard power voltage specifications
To guarantee liability of SCE8720C, V
shown below.
Ripple : 100mVp-p
Spike noise : 200mVp-p
A.3.1 Power not requiring ON/OFF by software
With systems not requiring powering-off by OS shutting down, Wake on LAN nor Wake
on RING, power control is much easier not requiring V
Block diagram is shown below. If the power ON/OFF switch cannot be used as the
switch to suspend, the switch to suspend is separately required.
Power supply
unit (Eg. AT
power supply)
ON/OFF SW
3.3V
Suspend LED
Figure A.7 Example of peripheral circuit for power not controlled by software
Rev.A
CC5V
V
, V
, V
CC5V
CCCORE
CC3V
POWERGOOD signal of the
power supply
Reset
circuit
SUSPEND SW
Note) Connect V
EPSON
CARD-PCI/GX Hardware Manual
, V
and V
CCCORE
CC3V
.
CCSTB
CARD-PCI
V
CC5V
V
CCSTB
Reset
Powergood
POFF
NC
PWSW#
STANDBY#
NC
PME0#
NC
PME1#
to V
.
CC5V
CCSTB
requires power quality
73
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