WM8311
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Processor Power Management Subsystem
DESCRIPTION
FEATURES
Power Management
The WM8311 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 WM8311 is designed to operate as a system
PMIC supporting a variety of industry-standard processors and
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)
2 x LDO regulators (0.9V - 3.3V, 100mA, 2)
1 x Low-noise LDO regulators (1.0V - 3.5V, 200mA, 1)
1 x ‘Alive’ LDO regulator (0.8V – 1.55V, up to 25mA)
accessories in
applications.
a wide range of consumer multimedia
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 WM8311.
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)
The WM8311 power management subsystem comprises of
four programmable DC-DC converters, seven LDO regulators
(one of which is 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.
Battery monitoring for temperature and voltage
Autonomous backup battery charging and switching
System Control
I2C or SPI compatible primary control interface
WM8311 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 WM8311.
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
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.
WM8311 detects and handles battery fault conditions with a
minimum of system software involvement.
Auxiliary ADC for multi-function analogue measurement
Touch Panel interface controller (4-wire and 5-wire)
128-bit pseudo-random unique ID
Secure Real-Time Clock with wake-up alarm
16 x configurable multi-function (GPIO) pins
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. The Touch
Panel controller uses the same ADC on an interleaved basis.
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
WM8311 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.
Selectable USB current limiting up to 1.8A (in accordance
with USB Battery Charging specification Rev 1.1)
Package Options
8x8mm, 121-ball BGA package, 0.65mm ball pitch
To maximise battery life, highly-granular power management
enables each function in the WM8311 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.
APPLICATIONS
Portable Media Players
Portable Navigation Devices
Cellular Handsets
Electronic Books
Electronic Gaming Devices
The WM8311 is supplied in a 8x8mm 121-ball BGA package,
ideal for use in portable systems. The WM8311 forms part of
the Wolfson series of audio and power management solutions.
Pre-Production, May 2012, Rev 3.1
Copyright 2012 Wolfson Microelectronics plc
WOLFSON MICROELECTRONICS plc
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