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What is WM8326?

This electronic component, produced by the manufacturer "Wolfson Microelectronics", performs the same function as "Processor Power Management Subsystem".


WM8326 Datasheet PDF - Wolfson Microelectronics

Part Number WM8326
Description Processor Power Management Subsystem
Manufacturers Wolfson Microelectronics 
Logo Wolfson Microelectronics Logo 


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WM8326
Processor Power Management Subsystem
DESCRIPTION
The WM8326 is an integrated power-management subsystem
which provides a cost-effective, flexible, single-chip solution for
power management. It is specifically targeted at the
requirements of a range of low-power portable consumer
products, but is suitable to any application with a multimedia
processor. The WM8326 is designed to operate as a system
PMIC supporting the ARM9™, ARM11™ and ARM Cortex-A™
processors, but is also capable of supporting the majority of
application and mobile processors at the heart of a wide range
of low-power consumer multimedia applications.
The start-up behaviour and configuration is fully programmable
in an integrated OTP non-volatile memory. This highly flexible
solution helps reduce time-to-market, as changing application
requirements can be very easily accommodated in the OTP.
The InstantConfigTM interface enables an external EEPROM to
configure the WM8326.
The WM8326 power management subsystem comprises four
programmable DC-DC converters and eleven LDO regulators
(four of which are low-noise for supplying sensitive analogue
subsystems). The integrated OTP bootstrap circuitry controls
the start-up sequencing and voltages of the converters and
regulators as well as the sequencing of system clocks.
The DC-DC converters deliver high performance and high
efficiency across a wide range of operating conditions. They
are optimised to support the high load current transients seen
in modern processor core domains. DC-DC3 / DC-DC4 can be
connected together and operated in ‘dual’ mode to support an
increased current load of up to 1.6A
An on-chip regulator provides power for always-on PMIC
functions such as register map and the RTC. The device
provides autonomous backup battery switchover. A low-power
LDO is included to support ‘Alive’ processor power domains
external to the WM8326.
A 12-bit Auxiliary ADC supports a wide range of applications
for internal as well as external analogue sampling, such as
voltage detection and temperature measurement.
WM8326 includes a crystal oscillator and an internal RC
oscillator to generate all clock signals for autonomous system
start-up and processor clocking. A Secure Real-time Clock (S-
RTC) and alarm function is included, capable of waking up the
system from low-power modes. A watchdog function is
provided to ensure system integrity.
To maximise battery life, highly-granular power management
enables each function in the WM8326 subsystem to be
independently powered down through a control interface or
alternatively through register and OTP-configurable GPIOs.
The device offers a standby power consumption of <7uA,
making it particularly suitable for portable applications.
The WM8326 is supplied in an 8x8mm 81-lead QFN package,
ideal for use in portable systems. The WM8326 forms part of
the Wolfson series of audio and power management solutions,
and is widely register compatible with the WM831X devices.
FEATURES
Power Management
2 x DC-DC synchronous buck converters
(0.6V - 1.8V, 2.5A, DVS)
2 x DC-DC synchronous buck converters
(0.85V - 3.4V, 1A)
1 x LDO regulator (0.9V - 3.3V, 300mA, 1)
2 x LDO regulators (0.9V - 3.3V, 200mA, 1)
3 x LDO regulators (0.9V - 3.3V, 100mA, 2)
2 x Low-noise LDO regulators (1.0V - 3.5V, 200mA, 1)
2 x Low-noise LDO regulators (1.0V - 3.5V, 150mA, 2)
1 x ‘Alive’ regulator (0.8V – 1.55V, up to 25mA)
System Control
I2C or SPI compatible primary control interface
Comprehensive interrupt scheme
Watchdog timer and system reset control
Autonomous power sequencing and fault detection
OTP memory bootstrap configuration function
Additional Features
Auxiliary ADC for multi-function analogue measurement
128-bit pseudo-random unique ID
Secure Real-Time Clock with wake-up alarm
12 x configurable multi-function (GPIO) pins
Comprehensive clocking scheme: low-power 32kHz RTC
crystal oscillator, GPIO clock output and 4MHz RC clock
for power management
System LED outputs indicating device power state, and
fault status
Package Options
8 x 8 x 0.85mm, 81-lead QFN package
APPLICATIONS
Cellular Handsets
Smartphones
Electronic Books
Portable Media Players
Mobile Internet Devices
Electronic Gaming Devices
Netbooks
Smartbooks
Set Top Box
Digital Picture Frames
WOLFSON MICROELECTRONICS plc
To receive regular email updates, sign up at http://www.wolfsonmicro.com/enews
Production Data, June 2012, Rev 4.0
Copyright 2012 Wolfson Microelectronics plc

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WM8326 equivalent
Production Data
WM8326
14.1  GENERAL DESCRIPTION ............................................................................... 49 
14.2  ICE AND OTP MEMORY DEFINITION ............................................................ 49 
14.3  BOOTSTRAP (START-UP) FUNCTION........................................................... 50 
14.3.1  START-UP FROM OTP MEMORY ...................................................................................... 50 
14.3.2  START-UP FROM ICE MEMORY (DEVELOPMENT MODE).............................................. 51 
14.3.3  START-UP FROM DCRW REGISTER SETTINGS ............................................................. 51 
14.3.4  EXTERNAL ICE MEMORY CONNECTION ......................................................................... 51 
14.4  OTP / ICE MEMORY CONTROL...................................................................... 52 
14.4.1  ENTERING / EXITING THE PROGRAM STATE ................................................................. 53 
14.4.2  OTP / ICE READ COMMAND .............................................................................................. 53 
14.4.3  OTP WRITE COMMAND ..................................................................................................... 54 
14.4.4  OTP VERIFY COMMAND .................................................................................................... 54 
14.4.5  OTP FINALISE COMMAND ................................................................................................. 55 
14.4.6  OTP CONTROL REGISTER ................................................................................................ 55 
14.5  OTP / ICE INTERRUPTS ................................................................................. 57 
14.6  DCRW MEMORY CONTENTS......................................................................... 57 
14.6.1  DCRW PAGE 0 ....................................................................................................................57 
14.6.2  DCRW PAGE 1 ....................................................................................................................58 
14.6.3  DCRW PAGE 2 ....................................................................................................................58 
14.6.4  DCRW PAGE 3 ....................................................................................................................59 
14.6.5  DCRW PAGE 4 ....................................................................................................................61 
15  POWER MANAGEMENT ............................................................................ 62 
15.1  GENERAL DESCRIPTION ............................................................................... 62 
15.2  DC-DC CONVERTER AND LDO REGULATOR ENABLE ............................... 62 
15.3  TIMESLOT CONTROL AND HARDWARE ENABLE (GPIO) CONTROL......... 63 
15.4  OPERATING MODE CONTROL ...................................................................... 64 
15.4.1  DC-DC SYNCHRONOUS BUCK CONVERTERS................................................................ 64 
15.4.2  LDO REGULATORS ............................................................................................................ 64 
15.5  OUTPUT VOLTAGE CONTROL ...................................................................... 64 
15.5.1  DC-DC SYNCHRONOUS BUCK CONVERTERS................................................................ 64 
15.5.2  LDO REGULATORS 1-10 ....................................................................................................65 
15.5.3  LDO REGULATOR 11.......................................................................................................... 65 
15.6  DC-DC SYNCHRONOUS BUCK CONVERTER CONTROL............................ 65 
15.6.1  DC-DC3 / DC-DC4 DUAL MODE ......................................................................................... 66 
15.7  LDO REGULATOR CONTROL ........................................................................ 67 
15.8  HARDWARE CONTROL (GPIO)...................................................................... 67 
15.9  FAULT PROTECTION...................................................................................... 68 
15.10  MONITORING AND FAULT REPORTING ....................................................... 68 
15.11  POWER MANAGEMENT REGISTER DEFINITIONS ...................................... 69 
15.11.1  DC-DC CONVERTER AND LDO REGULATOR ENABLE ................................................... 69 
15.11.2  DC-DC SYNCHRONOUS BUCK CONVERTER CONTROL................................................ 69 
15.11.3  LDO REGULATOR CONTROL ............................................................................................ 76 
15.11.4  EXTERNAL POWER ENABLE (EPE) CONTROL................................................................ 84 
15.11.5  MONITORING AND FAULT REPORTING........................................................................... 85 
15.12  POWER MANAGEMENT INTERRUPTS ......................................................... 86 
15.13  POWER GOOD INDICATION .......................................................................... 88 
15.14  DC-DC SYNCHRONOUS BUCK CONVERTER OPERATION ........................ 90 
15.14.1  OVERVIEW .......................................................................................................................... 90 
15.14.2  DC-DC SYNCHRONOUS BUCK CONVERTERS................................................................ 90 
15.15  LDO REGULATOR OPERATION..................................................................... 94 
15.15.1  OVERVIEW .......................................................................................................................... 94 
15.15.2  LDO REGULATORS ............................................................................................................ 95 
16  RESERVED ................................................................................................. 96 
17  POWER SUPPLY CONTROL ..................................................................... 97 
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PD, June 2012, Rev 4.0
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