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Power Supply
PCI Connectors
MPC8272ADS Logic & Peripherals
5V
12V 3.3V -12V
5V
3.3V
5V
3.3V
3.3V
VDDL
1.5V
VCCSYN VCCSYN1 VDDL
VDDH
ATX
Power Supply
PowerQUICC II
Figure 7-1. MPC8272ADS Power Scheme
To support off-board application development, the power buses are connected to the
expansion connectors so that external logic may be powered directly from the board. The
maximum current allowed to be drawn from the board on each bus also depends on the
current drawn by the PCI bus. The figures are shown in Figure 7-1.
Table 7-1. Expansion Connectors Maximum Current Consumption
Power Bus
VCC
V3.3
Max. Current
TBD
TBD
The PCI Standard specifies that each add-in card should consume maximum 25 W from all
power sources combined. The maximum current consumption allowed per power source
for a total of 25 W according to the PCI standard is shown in Table 7-2.
Table 7-2. Maximum Power Consumption Per Add-In Card
Power Rail
5V
3.3 V
12 V
Add-In Card
5A Max. (system dependent)
7.6A Max. (system dependent)
500mA
MPC8272ADS User Guide
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