Wolfson WM8320处理器电源管理方案

Wolfson 公司的WM8320是综合的处理器电源管理子系统,提供高性价比的灵活的单片解决方案,特别适合于低功率手提应用. WM8320支持ARM9, ARM11和ARM Cortex-A系列处理器,具有电源管理,系统控制以及其它用于多功能模拟测量的ADC,128位伪随机ID,带叫醒的安全RTC和系统LED输出指示电源状态和故障状态等功能,主要用在手机,智能手机,电子书,PMP,移动互联网设备(MID),电子游戏,上网本和机顶盒.本文介绍了WM8320的主要特性,方框图以及在手提媒体播放器(PMP), 手提导航设备, 数码相机, 数码相框, VOIP电话, 电子阅读器和婴儿监视器的应用框图以及WM8320评估板详细电路图.
Processor Power Management Subsystem
WM8320 is an integrated power-management subsystem which provides a cost-effective, flexible, single-chip solution for power management, specifically targeted at the requirements of a range of low-power portable applications.
WM8320 is specifically designed to operate as a system PMIC supporting the ARM9™, ARM11™ and ARM Cortex-A™ series processors at the heart of a range of low-power
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 contents. An external EEPROM can be used to configure the WM8320 for development purposes.
The WM8320 power management subsystem comprises four programmable DC-DC converters and 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.
The DC-DC converters deliver high performance and high efficiency across a wide range of operating conditions. They are optimised to support the high load current transients seen in modern processor core domains. DC-DC3 / DC-DC4 can be connected together and operated in ‘dual’ mode to support an increased current lo...