WM8326 w Processor Power Management Subsystem DESCRIPTION FEATURES Power Management The WM8326 is an integrated power-management subsystem which provides a cost-effective, flexible, single-chip solution for 2 x DC-DC synchronous buck converters power management. It is specifically targeted at the (0.6V - 1.8V, 2.5A, DVS) requirements of a range of low-power portable consumer 2 x DC-DC synchronous buck converters products, but is suitable to any application with a multimedia (0.85V - 3.4V, 1A) processor. The WM8326 is designed to operate as a system 1 x LDO regulator (0.9V - 3.3V, 300mA, 1 ) PMIC supporting the ARM9, ARM11 and ARM Cortex-A 2 x LDO regulators (0.9V - 3.3V, 200mA, 1 ) processors, but is also capable of supporting the majority of 3 x LDO regulators (0.9V - 3.3V, 100mA, 2 ) application and mobile processors at the heart of a wide range of low-power consumer multimedia applications. 2 x Low-noise LDO regulators (1.0V - 3.5V, 200mA, 1 ) 2 x Low-noise LDO regulators (1.0V - 3.5V, 150mA, 2 ) The start-up behaviour and configuration is fully programmable in an integrated OTP non-volatile memory. This highly flexible 1 x Alive regulator (0.8V 1.55V, up to 25mA) solution helps reduce time-to-market, as changing application requirements can be very easily accommodated in the OTP. System Control TM The InstantConfig interface enables an external EEPROM to 2 I C or SPI compatible primary control interface configure the WM8326. Comprehensive interrupt scheme The WM8326 power management subsystem comprises four Watchdog timer and system reset control programmable DC-DC converters and eleven LDO regulators Autonomous power sequencing and fault detection (four of which are low-noise for supplying sensitive analogue subsystems). The integrated OTP bootstrap circuitry controls OTP memory bootstrap configuration function the start-up sequencing and voltages of the converters and regulators as well as the sequencing of system clocks. Additional Features The DC-DC converters deliver high performance and high Auxiliary ADC for multi-function analogue measurement efficiency across a wide range of operating conditions. They 128-bit pseudo-random unique ID are optimised to support the high load current transients seen Secure Real-Time Clock with wake-up alarm in modern processor core domains. DC-DC3 / DC-DC4 can be 12 x configurable multi-function (GPIO) pins connected together and operated in dual mode to support an increased current load of up to 1.6A Comprehensive clocking scheme: low-power 32kHz RTC crystal oscillator, GPIO clock output and 4MHz RC clock An on-chip regulator provides power for always-on PMIC for power management functions such as register map and the RTC. The device System LED outputs indicating device power state, and provides autonomous backup battery switchover. A low-power fault status LDO is included to support Alive processor power domains external to the WM8326. Package Options A 12-bit Auxiliary ADC supports a wide range of applications for internal as well as external analogue sampling, such as 8 x 8 x 0.85mm, 81-lead QFN package voltage detection and temperature measurement. WM8326 includes a crystal oscillator and an internal RC oscillator to generate all clock signals for autonomous system APPLICATIONS start-up and processor clocking. A Secure Real-time Clock (S- Cellular Handsets RTC) and alarm function is included, capable of waking up the Smartphones system from low-power modes. A watchdog function is provided to ensure system integrity. Electronic Books Portable Media Players To maximise battery life, highly-granular power management enables each function in the WM8326 subsystem to be Mobile Internet Devices independently powered down through a control interface or Electronic Gaming Devices alternatively through register and OTP-configurable GPIOs. Netbooks The device offers a standby power consumption of <7uA, Smartbooks making it particularly suitable for portable applications. Set Top Box The WM8326 is supplied in an 8x8mm 81-lead QFN package, Digital Picture Frames ideal for use in portable systems. The WM8326 forms part of the Wolfson series of audio and power management solutions, and is widely register compatible with the WM831X devices. Production Data, June 2012, Rev 4.0 WOLFSON MICROELECTRONICS plc To receive regular email updates, sign up at WM8326 Production Data BLOCK DIAGRAM GND DC-DC1 DC-DC2 DC-DC3 DC-DC4 DBVDD Instant (Exposed Ground Paddle) Buck Buck Buck Buck TM Config Interrupt and Primary Control 0.6 to 1.8V 0.6 to 1.8V 0.85 to 3.4V 0.85 to 3.4V Reset Controller Interface EEPROM 2.5A 2.5A 1A 1A Interface PROGVDD DVS DVS Dual Mode Control System OTP NVM Register Map and VREFC Status Bootstrap LED1 Application Processor References LED2 LED Config & IREFR Interface Unique ID Driver LDO 1 Standard LDO LDO1VOUT 0.9 to 3.3V 300mA LDO1 2VDD LDO 2 Standard LDO LDO2VOUT GPIO1 1 to 4MHz 0.9 to 3.3V 200mA WM8326 GPIO2 RC LDO3VDD LDO 3 Standard LDO GPIO3 Oscillator Multi- 0.9 to 3.3V 200mA LDO3VOUT Power GPIO4 Function Pin LDO4VDD GPIO5 Management LDO 4 Standard LDO (GPIO) Control 0.9 to 3.3V 100mA GPIO6 LDO4VOUT Controller PM Sub- GPIO7 LDO 5 Standard LDO LDO5VDD System GPIO8 0.9 to 3.3V 100mA LDO5VOUT Monitoring GPIO9 LDO 6 Standard LDO LDO6VDD 0.9 to 3.3V 100mA LDO6VOUT LDO 7 Analogue LDO LDO7VOUT ON 1.0 to 3.5V 200mA AP Interface, GPIOs and PM Control LDO7 8VDD LDO 8 Analogue LDO LDO8VOUT 1.0 to 3.5V 200mA LDO 9 Analogue LDO LDO9VOUT 1.0 to 3.5V 150mA GPIO10 LDO9 10VDD LDO 10 Analogue LDO Aux GPIO11 LDO10VOUT 1.0 to 3.5V 150mA ADC GPIO12 LDO 11 Alive LDO CHIP temperature LDO11VOUT 0.8 to 1.55V 25mA LDO12VOUT LDO 12 Internal LDO 2.1V 2mA (Backup Battery Connection) XTO 32.768kHz Real-Time Wake-Up Oscillator Clock Timer LDO 13 Internal LDO XTI LDO13VOUT 2.5V 20mA XOSCGND CLKOUT Internal Power Source PVDD TEST (test function only) Management Clocking and Auxiliary ADC Functions Power Management PD, June 2012, Rev 4.0 w 2 IRQ RESET CS SDA1 SCLK1 SDOUT1 CIFMODE SDA2 SCLK2 DC1GND DC1FB DC1LX DC1VDD DC2GND DC2FB DC2LX DC2VDD DC3GND DC3FB DC3LX DC3VDD DC4GND DC4FB DC4LX DC4VDD