WM8310 Datasheet, PDF (1/291 Pages) Wolfson Microelectronics plc – Processor Power Management Subsystem

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WM8310
Processor Power Management Subsystem
DESCRIPTION
The WM8310 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 WM8310 is designed to operate as a system
PMIC supporting a variety of industry-standard processors and
accessories in a wide range of 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 InstantConfig™ interface enables an external EEPROM to
configure the WM8310.
The WM8310 power management subsystem comprises of
four programmable DC-DC converters, 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.
WM8310 can be powered from a battery, a wall adaptor or
from a USB power source. 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 WM8310.
A linear on-chip battery charger supports trickle charging and
constant current / constant voltage charging of single-cell
lithium-ion / lithium-polymer batteries. The charge current,
termination voltage, and charger time-out are programmable.
WM8310 detects and handles battery fault conditions with a
minimum of system software involvement.
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.
WM8310 includes a crystal oscillator, an internal RC oscillator
and Frequency Locked Loop (FLL) to generate clock signals
for autonomous system start-up and processor clocking. A
Secure Real-time Clock (S-RTC) and alarm function is
included, capable of system wake-up 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 WM8310 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 <10uA,
making it particularly suitable for portable applications.
The WM8310 is supplied in a 7x7mm 169-ball BGA package,
ideal for use in portable systems. The WM8310 forms part of
the Wolfson series of audio and power management solutions.
FEATURES
Power Management
 2 x DC-DC synchronous buck converters
(0.6V - 1.8V, 1.2A, DVS)
 1 x DC-DC synchronous buck converter (0.85V - 3.4V, 1A)
 1 x DC-DC boost converter (up to 30V, up to 90mA)
 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’ LDO regulator (0.8V – 1.55V, up to 25mA)
Backlight LED Current Sinks
 2 x programmable constant current sinks, suitable for
multi-LED display backlight control
Battery Charger
 Programmable single-cell lithium-ion / lithium-polymer
battery charger (1A max charge current)
 Battery monitoring for temperature and voltage
 Autonomous backup battery charging and switching
System Control
 I²C or SPI compatible primary control interface
 Interrupt based feedback communication scheme
 Watchdog timer and system reset control
 Autonomous power sequencing and fault detection
 Intelligent power path and power source selection
 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, Frequency Locked Loop, GPIO clock
output and 4MHz RC clock for power management
 System LED outputs indicating power state, battery
charger or fault status
 Selectable USB current limiting up to 1.8A (in accordance
with USB Battery Charging specification Rev 1.1)
Package Options
 7x7mm, 169-ball BGA package, 0.5mm ball pitch
APPLICATIONS
 Portable Media Players
 Portable Navigation Devices
 Cellular Handsets
 Electronic Books
 Electronic Gaming Devices
WOLFSON MICROELECTRONICS plc
Pre-Production, May 2012, Rev 3.1
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Copyright 2012 Wolfson Microelectronics plc