You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
<strong>VIPER</strong> <strong>Technical</strong> <strong>Manual</strong>Power and power managementAudio power managementVLThe audio interface supports the AC’97 low power modes. Shutting down the digital andanalog interfaces can reduce consumption by up to 38mA ±3mA (190mW ±15mW).To shut down the AC’97 Codec, the software must write to the relevant bits in thePowerdown Control / Status Register (26h). Please see the LM4549 datasheetcontained on the Development Kit CD.TPMVLIf the <strong>VIPER</strong> has the TPM option the <strong>VIPER</strong> consumes a further 3.5mA (17.5mW) whilethe TPM IC is idle, and 17mA (85mW) while the TPM IC is operating. This devicecannot be shutdown.Wake up eventsWhen the PXA255 processor is placed into sleep mode, two sources can be used towake the processor.SourceUSER_CONFIG1RTC AlarmGPIOGPIO7InternalSee section 3.5 in the PXA255 Applications Processor Developers <strong>Manual</strong>, included inthe Development Kit CD.© 2007 Arcom Issue D 84
Change language