Cirrus Logic, Inc. Processor Power Management Subsystem WM8310


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Processor Power Management Subsystem - WM8310 - Cirrus Logic, Inc.
Austin, TX, USA
Processor Power Management Subsystem WM8310
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. 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
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Technical Specifications

  Cirrus Logic, Inc.
Product Category Supervisory Circuits and Battery Monitor Chips
Product Number WM8310
Product Name Processor Power Management Subsystem
Number of Supplies 4
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