Power Considerations
AM4011
Page 5 - 4
ID 1022-1626, Rev. 1.0
P R E L I M I N A R Y
5.2.2
Payload and MMC Voltage Ramp
Power supplies must comply with the following guidelines in order to be used with the AM4011:
•
Beginning at 10% of the nominal output voltage, the voltage must rise within
> 0.1 ms to < 20 ms to the specified regulation range of the voltage. Typically:
> 5 ms to < 15 ms.
•
There must be a smooth and continuous ramp of each DC output voltage from
10% to 90% of the regulation band.
The slope of the turn-on waveform shall be a positive, almost linear voltage increase and have
a value from 0 V to nominal Vout.
5.2.3
Module Management Power Consumption
The module management power is used only for the Module Management Controller (MMC),
which has a very low power consumption. The management power voltage measured on the
AMC at the connector shall be 3.3 V ± 5% and the maximum current is 100 mA (see Table 5-1,
“DC Operational Input Voltage Ranges”).
5.3
Payload Power Consumption of the AM4011
The goal of this description is to provide a method to calculate the payload power consumption
for the AM4011 board with different configurations and applications. The processor, the chipset
and the memory dissipate the majority of the payload power.
The payload power consumption table below lists the voltage and power specifications for the
AM4011 board using the Intel® Core™2 Duo processor. The values were measured using an
AMC carrier with two power supplies, one for the AM4011 module, and the other for the hard
disk and the peripheral devices.
The operating systems used were DOS and Linux. All measurements were conducted at a tem-
perature of 25°C with a nominal payload power of 12 V and with the following interfaces con-
nected:
•
Front Gigabit Ethernet
•
Front Serial Port
•
Front USB (keyboard and mouse)
All AMC fabric interfaces were active during the measurements.
The module management power is below 0.3 W and it has therefore not been taken into con-
siderations during the measurements.
The measured values varied, because the power consumption was dependent on processor
activity.
Note ...
The power consumption values indicated in the table below can vary depend-
ing on the ambient temperature or the system performance. This can result in
deviations of the power consumption values of up to 10%.
