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Intel PXA27X manual Batteries, Main Battery, Backup Battery, Application Note

Models: PXA27X

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2.2Batteries

Intel® PXA27x Processor Family Power Requirements

these supplies must come up at the required voltage to operate reliably and to avoid damage to the external components. VCC_IO must be the highest potential of the system I/O supplies1. VCC_IO can be connected to any of VCC_LCD, VCC_MEM, VCC_USIM, VCC_USB and VCC_BB, but none of these supplies can exceed VCC_IO.

The power-up voltage requirement must be communicated by some input strapping mechanism on the PMIC if a PMIC can provide more than one voltage level for any of these domains. This ensures that each regulator powers up to its designated voltage without processor intervention. Software must read this configuration information using an I2C command.

2.2Batteries

The PXA27x processor supports a variety of system battery configurations with both a main battery and backup battery, and a main battery alone.

In systems with only a main battery, the main battery must drive VCC_BATT directly or use a regulator. In systems with a backup battery, the backup battery connects directly to VCC_BATT or the backup battery can be connected to a power controller, which in turn drives the PXA27x processor VCC_BATT.

2.2.1Main Battery

The main battery is a rechargeable single cell (or multiple cells in parallel) using lithium-ion or lithium-polymer technology. These batteries typically present a voltage as high as 4.2 V when fully charged, declining to under 3.0 V as they discharge. A main battery capacity of 500 to 1200 mAh is typical for most applications.

2.2.2Backup Battery

The backup battery is a lithium or lithium-manganese coin cell with an output voltage of approximately 3.0 V. The backup battery is a small rechargeable coin cell permanently mounted to the printed circuit board (PCB) in many handset applications. The PMIC must include a regulator and associated circuitry for recharging this type of backup battery. The two backup battery configurations are shown in Table 6.

1.excluding VCC_BATT and VCC_USB

14	Application Note

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Intel PXA27X Batteries, Main Battery, Backup Battery, Intel PXA27x Processor Family Power Requirements, Application Note

Contents

Intel PXA27x Processor Family Power Requirements Application NoteApplication Note Contents ContentsIntel PXA27x Processor Family Power Requirements IntroductionFigures Intel PXA27x Processor Family Power RequirementsContents TablesIntel PXA27x Processor Family Power Requirements 1.0 Introduction1.1 Naming Conventions Application NoteIntel PXA27x Processor Family Power Requirements 2.0 Intel PXA27x Processor Power Supply DomainsTable 1. External Power Supply Descriptions Application NoteApplication Note Figure 1. Intel PXA27x Processor Internal and External Power DomainsIntel PXA27x Processor Family Power Requirements Intel PXA27x Processor Family Power Requirements 2.1 Power Domains and System Voltage/Current Requirements2.1.1 Intel PXA27x Processor Power Supplies Application NoteApplication Note Table 2. Intel PXA27x Processor Voltage Domains Sheet 1 ofIntel PXA27x Processor Family Power Requirements VoltageIntel PXA27x Processor Family Power Requirements 2.1.2 Power Supply Configuration in a Minimal SystemTable 2. Intel PXA27x Processor Voltage Domains Sheet 2 of Application Note2.1.3.1 Intel PXA27x Processor VCCCORE Supply Current 2.1.3 Modeling Intel PXA27x processor power consumptionTable 3. Regulators Required to Power the Intel PXA27x Processor Intel PXA27x Processor Family Power RequirementsIntel PXA27x Processor Family Power Requirements 2.1.3.2 Supply Current For Each Power DomainTable 4. Intel PXA27x Processor VCCCORE Supply Current Application NoteIntel PXA27x Processor Family Power Requirements 2.1.4 Default Reset ValuesTable 5. Intel PXA27x Processor Supply Current For Each Power Domain Application Note2.2 Batteries 2.2.1 Main Battery2.2.2 Backup Battery Intel PXA27x Processor Family Power RequirementsIntel PXA27x Processor Family Power Requirements 2.2.3 Battery Chargers and Main PowerTable 6. Possible Backup Battery Configurations Application NoteApplication Note Figure 2. Typical Battery and External Regulator ConfigurationIntel PXA27x Processor Family Power Requirements PXA27x ProcessorIntel PXA27x Processor Family Power Requirements 3.0 Intel PXA27x Processor Low Power Operating ModesTable 7. Intel PXA27x Processor Operating Modes Application NoteIntel PXA27x Processor Family Power Requirements 4.0 Power Controller Interface SignalsFigure 3. Overview of Power Management Operating Modes Application Note4.3 Power Manager I2C Clock PWRSCL / GPIO3 4.1 Power Enable PWREN4.2 System Power Enable SYSEN / GPIO2 Table 8. Power Controller Interface Signals4.6.2 User-Initiated Hard Reset Input 4.4 Power Manager I2C Data PWRSDA / GPIO44.6 On, Off, and RESET 4.5 System-Level Considerations for I2C4.7 Universal Subscriber Identity Module USIM 4.8 Power Manager Capacitor Signals4.6.3 nRESET Output from PMIC to the Intel PXA27x Processor Intel PXA27x Processor Family Power Requirements5.1.1 Cold-Start Power-On and Hardware Reset 5.0 Power Mode Sequencing5.1 Power-On Intel PXA27x Processor Family Power RequirementsApplication Note 5.1.2 Initial Power Up and Deep Sleep Exit SequenceIntel PXA27x Processor Family Power Requirements Application Note 5.1.3 Hardware Reset BehaviorIntel PXA27x Processor Family Power Requirements Application Note Intel PXA27x Processor Family Power Requirements1. The PMIC asserts nRESET = power manager powered by VCCCORE Intel PXA27x Processor Family Power RequirementsPower = power manager powered by VCCBATTIntel PXA27x Processor Family Power Requirements 5.2 Sleep and Deep Sleep5.2.1 Sleep Entry and Exit Application NoteApplication Note 5.2.2 Deep Sleep Entry and ExitIntel PXA27x Processor Family Power Requirements Intel PXA27x Processor Family Power Requirements 6.0 Dynamic Voltage Management DVM6.1 VCCCORE Regulator and Dynamic Voltage Management Application NoteApplication Note 6.2 Intel PXA27x Processor Voltage ManagerIntel PXA27x Processor Family Power Requirements 7.1 nVDDFAULT 7.0 Fault Management6.3 Power Manager I2C Interface 6.4 DVM Sequencing8.1 General PMIC Characteristics 8.0 Power Management Integrated Circuit Requirements7.2 nBATTFAULT Intel PXA27x Processor Family Power RequirementsIntel PXA27x Processor Family Power Requirements 8.2 Features of a PMICTable 9. General PMIC Characteristics Application Note8.3.2 DVM Control Register 8.3 Programmable Voltage Control8.3.1 DVM Control Register Intel PXA27x Processor Family Power Requirements8.3.3 DVM Control and Status Register 8.3.4 Other Aspects of an Integrated Power Controller9.0 Summary Intel PXA27x Processor Family Power RequirementsIntel PXA27x Processor Family Power Requirements Application Note