基于PXA320嵌入式手持终端电源管理的设计

摘要

针对目前工业用手持设备要求长时间工作的特点,提出基于PXA320嵌入式手持终端电源管理系统的低功耗设计方案.首先分析核心处理器PXA320电源管理的各种工作模式,该核心处理器采用Intel SpeedStep技术能够使电池的续航能力得到提高；然后采用智能电源管理芯片LP3972设计了系统电源管理模块,该模块通过ⅡC总线与核心处理器PXA320通信,然后通过软件设计实现PXA320对电源管理模块为系统各工作模块的输出电压值的合理调节,最终达到降低手持设备功耗的目的.经实验测试表明,系统在实验测试阶段可稳定运行.%According to industrial handheld devices which require long time working at present,a design of embedded handheld terminal power management was proposed based on PXA320 processor,and various states of the power supply of PXA320 were analyzed.The core processor using Intel SpeedStep technology can make the battery endurance capacity be improved.A power supply module was designed.The module communicates with PXA320 through the ⅡC bus,and can be realized through the designed software that PXA320 adjusts power management module's output voltage values can be realized.The tests show that the system is stable and reliable and the results meet the design requirements.