UM0851 datasheet(238/245 Pages) STMICROELECTRONICS

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Power management section

UM0851

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Doc ID 16604 Rev 2

10.4.4

Performance

●

Power management framework

Below are some of the current consumption results that have been obtained for the

SPEAr600 and SPEAr300 boards.

The details of the test setup are as follows:

–

OS: Linux-2.6.27 running on SPEAr boards

–

Wake-up Source: Ethernet Magic Packets

–

Test setup: The target board was connected to a Host Linux PC, which sends in

the wake-up packets when the system goes into sleep. The target was booted up

using NFS. The current was measured on all the power supplies available on the

SPEAr boards, a first measurement before moving into suspended state and a

second measurement after resuming from suspended state.

SPEAr600

For the SPEAr600, the following jumpers were replaced one at a time to measure the

current source.

JP-1 (for 1.0 V)

JP-2 (for 1.8 V)

JP-3 (for 2.5 V)

JP-4 (for 3.3 V)

The current measurements indicate significant power savings. The table and figures below

present the results for SPEAr300.

Table 64.

SPEAr600 power consumption measurements

Jumper settings

Current in resumed

state (mA)

Current in suspended

state (mA)

Decrease in current

consumption

JP1 - 1.0 V

288.8

145

49.79%

JP2 - 1.8 V

96.2

67.8

29.59%

JP3 - 2.5 V

10.5

JP4 - 3.3 V

16.3

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