The WM8321 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 WM8321 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 InstantConfig™ interface enables an external EEPROM to configure the WM8321. The WM8321 power management subsystem comprises four programmable DC-DC converters and eleven LDO regulators (four of which are low-noise for supplying sensitive analogue subsystems).
- 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
- 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, GPIO clock output and 4MHz RC clock for power management
- System LED outputs indicating device power state, and fault status
- Applications:
- Cellular handsets
- Smartphones
- Electronic books
- Portable media players
- Mobile internet devices
- Electronic gaming devices
- Netbooks
- Smartbooks
- Set top box
- Digital picture frames
