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<strong>VIPER</strong> <strong>Technical</strong> <strong>Manual</strong>Power and power managementProcessor current estimationsThe current values in the tables below are referenced from running the <strong>VIPER</strong> at400MHz in performance mode whilst the <strong>VIPER</strong> is idle.The positive values (not shown in brackets) are the current saving by running the<strong>VIPER</strong> at slower frequencies or in power saving mode.The negative values are the current increases that can be expected whilst theprocessor is near maximum activity load.The values shown in brackets show the total current of the <strong>VIPER</strong> from the 5V supplybefore taking into account any power savings from shutting down <strong>VIPER</strong> features orincluding additional current for external peripherals.Please refer to the relevant operating system Quickstart <strong>Manual</strong> to select an alternativeoperating frequency.Processor Vcore (V)Current saving from 5V when processor core is in performance mode400MHzCCCR=0x161266MHzCCCR=0x143200MHzCCCR=0x141133MHzCCCR=0x123AsleepActive 1.29 -106mA ±20mA - - - -Active 1.1 - -47mA ±20mA - - -Active 1.06 - - -47mA ±20mA -36mA ±20mA -Idle 1.290mA (334mA)[Linux default]-- --Idle 1.1 - 7mA (327mA) - - -Idle 1.06 - - 7mA (327mA) 12mA (322mA) -Asleep 0 - - - - 54mA (271mA)© 2007 Arcom Issue D 75
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