应用于植入式医疗器械的低功耗控制器设计

摘要

目的 为了满足植入式医疗设备(Implantable Medical Device,IMD)应用的特殊要求,设计一种用于植入式医疗器械的低功耗、高效、灵活的微控制器(Micro Controller Units,MCU)以最优化利用IMD的电池能量.方法 基于对IMD主流技术分析,本研究通过对时钟控制、功率控制、指令设计改进和DMA数据路径优化等技术来优化设计基于0.18μm CMOS技术标准的MCU.结果 设计所得MCU芯片面积为1.4 mm×0.8 mm,芯片存储器具有79.1 K等效门和6.6 K字节片上内存.当供电为0.9 V的时候,功耗165μW,在空闲状态时可降低到42μW.结论 实现了一个可远程编程的低功耗、高效率的MCU,使得IMD更加节能和灵活,可在疾病监测或治疗中更好地执行监控或刺激等功能.%Objective To meet the special requirement of Implantable Medical Device (IMD), this study designed flexible Micro Control Units (MCU) of low-power consumption and high efficiency to achieve optimal use of battery power. Methods Based on the analysis of IMD mainstream technology, the design of MCU based on 0.18 μm CMOS technical standard was optimized by clock gating, power gating, instruction set improvement, DMA optimization for data paths, etc. Results The die area of the designed MCU was 1.4 mm×0.8 mm, and chip memory owned 79.1 K equivalent gates and 6.6 K on-chip memory. Given a 0.9 V power supply, MCU power consumption was 165 μW, and it could be reduced to 42 μW in idle state. Conclusion The designed MCU can be remotely programmed with low power consumption and high efficiency, which makes the IMD more flexible and energy saving to well perform its monitoring or stimulating function during disease surveillance or treatment.