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5.4 Power sequence
5.4.1 Power sequence
Follow the power ON/OFF sequence shown below.
V
CCCORE
V
CC5V
V
CC3V
POFF
POWERGOOD
I
(*)
3V
V
t
CCSTB
Figure 5.1 Power sequence (for power supply which is turned ON/OFF from the software)
*: I
is the current of V
3V
If V
starts up after V
CCORE
such as I
is supplied to V
PK
As a system power supply, it must be designed so that it is not damaged if a peak
current is supplied. For that, the following measures are available.
1) Suppress the peak current from the current control circuit. Voltage drop due to this
measure is acceptable.
2) Increase the current capacity.
Rev.A
(for power supply which is turned ON/OFF from the software)
t
p2
t
p7
t
p8
８
t
p1
t
p3
t
p4
I
PK
p11
supplied to SCE8720Cxx.
CC3V
, or if V
CC3V
. (typical I
CC3V
CARD-PCI/GX Hardware Manual
t
p10
shuts down before V
CCORE
=1.8A)
PK
EPSON
t
p9
t
p6
t
p5
I
PK
t
p12
, peak current
CC3V
49
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