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VIPER Technical Manual Power and power management
© 2007 Eurotech Ltd Issue E 75
Processor current estimations
The current values in the tables below are referenced from running the VIPER at
400MHz in performance mode whilst the VIPER is idle.
The positive values (not shown in brackets) are the current saving by running the
VIPER at slower frequencies or in power saving mode.
The negative values are the current increases that can be expected whilst the
processor is near maximum activity load.
The values shown in brackets show the total current of the VIPER from the 5V supply
before taking into account any power savings from shutting down VIPER features or
including additional current for external peripherals.
Please refer to the relevant operating system Quickstart Manual to select an alternative
operating frequency.
Current saving from 5V when processor core is in performance mode
Processor
Vcore (V)
400MHz
CCCR=0x161
266MHz
CCCR=0x143
200MHz
CCCR=0x141
133MHz
CCCR=0x123
Asleep
Active 1.29 -106mA ±20mA
- - - -
Active 1.1 - -47mA ±20mA
- - -
Active 1.06 - - -47mA ±20mA -36mA ±20mA -
Idle 1.29
0mA (334mA)
[Linux default]
-
- -
-
Idle 1.1 - 7mA (327mA)
- - -
Idle 1.06 - - 7mA (327mA) 12mA (322mA)
-
Asleep 0 - - - - 54mA (271mA)