Processor Power Management Subsystem

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 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 Cirrus Logic series of audio and power management solutions.

Technology

Power Management

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, 1Ω)
  • 2 x LDO regulators (0.9V - 3.3V, 200mA, 1Ω)
  • 3 x LDO regulators (0.9V - 3.3V, 100mA, 2Ω)
  • 2 x Low-noise LDO regulators (1.0V - 3.5V, 200mA, 1Ω)
  • 2 x Low-noise LDO regulators (1.0V - 3.5V, 150mA, 2Ω)
  • 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 analog 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

Parametric Specifications

Switching Frequency Selectable up to 4MHz
GPIOs 12
DC-DC Step-Down/Step-Up 3/1
LDO 11
Battery Charger true
Package 169 BGA

Technical Documents

WM8310 Product Bulletin

Mar 26, 2015, v3.1 : 337 Kb

WM8310 Product Datasheet

Mar 26, 2015, v3.1 : 1875 Kb

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Comprehensive Solutions