Power Considerations
AM4100
Page 6 - 4
ID 36126, Rev. 2.0
P R E L I M I N A R Y
6.2.2
Payload and MMC Voltage Ramp
Power supplies must comply with the following guidelines, in order to be used with the AM4100:
•
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.
6.2.3
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 6-
1, “DC Operational Input Voltage Ranges”).
6.3
Payload Power Consumption of the AM4100
The goal of this description is to provide a method to calculate the payload power consumption
for the AM4100 board with different configurations and applications. The processor and the
memory dissipate the majority of the payload power.
The payload power consumption tables below list the voltage and power specifications for the
AM4100 board using Freescale™ MPC8641D dual-core PowerPC® processors and various
memory sizes.
During the power measurements, the Linux OS with the NBench benchmark software was used
providing 99% workload on both cores. All measurements were conducted at a temperature of
25°C with a nominal payload power of 12 V and with the following interfaces connected:
•
Two front Gigabit Ethernet ports
•
One front serial port
The module management power is below 0.3 W and it was therefore not considered for these
measurements. The measured values varied, because the power consumption was dependent
on processor activity.
The payload power consumption was measured using the following processors:
•
Freescale MPC8641D processor, 1.0 GHz, 400 MHz platform frequency
(MC8641DVU1000GB)
•
Freescale MPC8641D processor, 1.32 GHz, 528 MHz platform frequency
(MC8641DVU1333JB)
•
Freescale MPC8641D processor, 1.5 GHz, 600 MHz platform frequency
(MC8641DVU1500KB)
with the Linux operating system with the NBench benchmark software.
Note ...
The power consumption values indicated in the tables below can vary depend-
ing on the ambient temperature or the component variation.
Summary of Contents for AM4100
Page 19: ...AM4100 Introduction ID 36126 Rev 2 0 Page 1 1 Introduction Chapter 1 1 P R E L I M I N A R Y...
Page 57: ...AM4100 Installation ID 36126 Rev 2 0 Page 3 1 Installation Chapter 1 3 P R E L I M I N A R Y...
Page 65: ...AM4100 Configuration ID 36126 Rev 2 0 Page 4 1 Configuration Chapter 1 4 P R E L I M I N A R Y...
Page 89: ...AM4100 NetBootLoader ID 36126 Rev 2 0 Page 5 1 NetBootLoader Chapter 1 5 P R E L I M I N A R Y...
