Eurotech Appliances VIPER / VIPER-LITE PXA255 User Manual

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VIPER Technical Manual

Power and power management

Current saving from 5V when processor core is in power saving mode

Processor Vcore (V)

400MHz

CCCR=0x241

300MHz

CCCR=0x321

200MHz

CCCR=0x221

100MHz

CCCR=0x121

Asleep

Active 1.29

-99mA

±20mA -

Active 1.1

- -46mA

±20mA -

Active

1.06

-32mA ±20mA -25mA ±20mA

Idle 1.29

9mA (325mA)

[Win CE default]

- - - -

Idle 1.1

- 19mA

(316mA)

- - -

Idle 1.06

- 19mA

(315mA)

29mA (308mA)

[Redboot /

VxWorks default]

Asleep 0

54mA

(271mA)

Current figures when the microprocessor is active were taken with the following
load conditions: calculating checksums of two files (first file: 1.1MB and second
file: 0.5MB), and copying two 256kB files.
When the microprocessor is asleep the PC/104 and AC97’ Codec clocks are
shutdown.