Intel PXA27X manual Power Domains and System Voltage/Current Requirements

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Intel® PXA27x Processor Family Power Requirements

2.1Power Domains and System Voltage/Current Requirements

The following sections document the power requirements for the PXA27x processor, but do not include external support, memory, or other peripheral components.

The power consumption values shown in Table 5 are all worst-case numbers. These numbers give the worst-case system power-supply requirements and do not reflect typical system power consumption.

2.1.1Intel® PXA27x Processor Power Supplies

Viewed externally, the processor can require up to nine independent voltages provided by regulated supplies. In some cases, multiple voltage domains might be strapped together, reducing the number of separate regulators to as few as four. Internally, there are more domains, but these are powered from the externally supplied domains by on-chip regulators. The internal domains are documented for informational purposes only; the external power controller does not have to consider them in its design.

Table 2 shows the PXA27x processor voltage domains.

8	Application Note

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Contents Intel PXA27x Processor Family Power Requirements Application NoteApplication Note Contents Figures Introduction Naming ConventionsPower Domain Enable1 Units Specified Levels Tolerance Volts Intel PXA27x Processor Power Supply DomainsExternal Power Supply Descriptions PLL PxtalSram DMAPower Domains and System Voltage/Current Requirements Intel PXA27x Processor Power SuppliesIntel PXA27x Processor Voltage Domains Sheet 1 Voltage DescriptionPower Supply Configuration in a Minimal System Intel PXA27x Processor Voltage Domains Sheet 2Modeling Intel PXA27x processor power consumption Regulators Required to Power the Intel PXA27x ProcessorIntel PXA27x Processor Vcccore Supply Current Regulator DescriptionIntel PXA27x Processor Vcccore Supply Current Supply Current For Each Power DomainFrequency Dhrystones Power MPEG4 Decode Power Stress Default Reset Values Intel PXA27x Processor Supply Current For Each Power DomainName Functional Units Current mA @ Power VccbattBatteries Main BatteryBackup Battery Backup Battery Description Battery Chargers and Main PowerPossible Backup Battery Configurations Typical Battery and External Regulator Configuration Intel PXA27x Processor Low Power Operating Modes Intel PXA27x Processor Operating ModesCPDIS=0 Power Controller Interface SignalsCPDIS=1 Power Enable Pwren System Power Enable Sysen / GPIO2Power Manager I2C Clock Pwrscl / GPIO3 Power Controller Interface SignalsPower Manager I2C Data Pwrsda / GPIO4 On, Off, and ResetUser-Initiated Hard Reset Input System-Level Considerations for I2CUniversal Subscriber Identity Module Usim Power Manager Capacitor SignalsNRESET Output from Pmic to the Intel PXA27x Processor Cold-Start Power-On and Hardware Reset Power Mode SequencingPower-On Initial Power Up and Deep Sleep Exit Sequence Vcccore Vccpll VccsramHardware Reset Behavior Intel PXA27x Processor Family Power Requirements Sysdel PwrdelSleep and Deep Sleep Sleep Entry and ExitDeep Sleep Entry and Exit Dynamic Voltage Management DVM Vcccore Regulator and Dynamic Voltage ManagementIntel PXA27x Processor Voltage Manager Fault Management Power Manager I2C InterfaceNVDDFAULT DVM SequencingGeneral Pmic Characteristics Power Management Integrated Circuit RequirementsNBATTFAULT Characteristic Description Features of a PmicGeneral Pmic Characteristics Programmable Voltage Control DVM Control RegisterDVM Control and Status Register Other Aspects of an Integrated Power ControllerSummary Intel PXA27x Processor Family Power Requirements