Intel PXA27X manual Introduction, Naming Conventions

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Intel® PXA27x Processor Family Power Requirements

1.0Introduction

The Intel® PXA27x Processor Family (PXA27x processor) is a highly integrated system-on-chip optimized for handheld battery-powered devices such as PDAs and 2.5G or 3G cell phones. The PXA27x processor is ideal for products requiring substantial computing and multimedia capability with very low power consumption.

The PXA27x processor combines a high-performance CPU with a variety of integrated peripheral functions. The processor has separate power supply domains for the processor core, memory, and peripherals to enable low-power system design. The PXA27x processor provides several dedicated control signals as well as an I2C interface to connect to an external power management integrated circuit.

Other system components, such as SDRAM and flash memory, audio codecs, touchscreen controllers, and specialized companion chips, have with their own unique power requirements. In many designs, a highly integrated power controller supplies power for these other components, particularly those that interface directly to the PXA27x processor. An advanced power controller can contain circuitry for charging batteries, powering the display panel, and include other analog functions required by the system.

In any system design, factors such as operating conditions, application workload, environmental considerations and the sophistication of the device’s power management software all play a role in determining the amount of power consumed. When designing a system, manufacturers need to take into account where the device is intended to be used (such as high temperature environments) and what it is expected to do for an end user (such as play a game, a video or do simple email transactions).

The Intel® PXA27x Processor Family EMTS provides manufacturers with a typical system power consumption specification for all frequencies of the processor family. The purpose of this application note is to provide guidance on how power consumption, in a typical environment can change, based on different software workloads. In addition, this application note provides further details on the requirements for providing power to the processor and for interfacing to its power control signals, including behavioral requirements and typical system design examples under these workloads.

The power numbers generated utilized Intel development platforms in lab conditions and the information provided should be used as a guideline only.

1.1Naming Conventions

In this document, active low items are prefixed with a lowercase “n”. nRESET

Bits within a signal name are enclosed in angle brackets:

EXTERNAL_ADDRESS<31:0> nCS<1>

Bits within a register bit field are enclosed in square brackets:

REGISTER_BITFIELD[3:0]

REGISTER_BIT[0]

Application Note

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Contents Application Note Intel PXA27x Processor Family Power RequirementsApplication Note Contents Figures Naming Conventions IntroductionPower Domain Enable1 Units Specified Levels Tolerance Volts Intel PXA27x Processor Power Supply DomainsExternal Power Supply Descriptions Pxtal PLLSram DMAIntel PXA27x Processor Power Supplies Power Domains and System Voltage/Current RequirementsVoltage Description Intel PXA27x Processor Voltage Domains Sheet 1Intel PXA27x Processor Voltage Domains Sheet 2 Power Supply Configuration in a Minimal SystemRegulators Required to Power the Intel PXA27x Processor Modeling Intel PXA27x processor power consumptionIntel PXA27x Processor Vcccore Supply Current Regulator DescriptionIntel PXA27x Processor Vcccore Supply Current Supply Current For Each Power DomainFrequency Dhrystones Power MPEG4 Decode Power Stress Intel PXA27x Processor Supply Current For Each Power Domain Default Reset ValuesName 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 Operating Modes Intel PXA27x Processor Low Power Operating ModesCPDIS=0 Power Controller Interface SignalsCPDIS=1 System Power Enable Sysen / GPIO2 Power Enable PwrenPower Manager I2C Clock Pwrscl / GPIO3 Power Controller Interface SignalsOn, Off, and Reset Power Manager I2C Data Pwrsda / GPIO4User-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 Vcccore Vccpll Vccsram Initial Power Up and Deep Sleep Exit SequenceHardware Reset Behavior Intel PXA27x Processor Family Power Requirements Pwrdel SysdelSleep Entry and Exit Sleep and Deep SleepDeep Sleep Entry and Exit Vcccore Regulator and Dynamic Voltage Management Dynamic Voltage Management DVMIntel PXA27x Processor Voltage Manager Power Manager I2C Interface Fault ManagementNVDDFAULT DVM SequencingGeneral Pmic Characteristics Power Management Integrated Circuit RequirementsNBATTFAULT Characteristic Description Features of a PmicGeneral Pmic Characteristics DVM Control Register Programmable Voltage ControlDVM Control and Status Register Other Aspects of an Integrated Power ControllerSummary Intel PXA27x Processor Family Power Requirements
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