沉睡的巨人——把Power Low放在更大的地方

　　隨著更多的功能被推向更小更復(fù)雜的設(shè)備，低功耗已經(jīng)成為一個(gè)不可避免的大問(wèn)題。特別是，對(duì)于具有限制性能源（如電池電量）和限制空間限制的手持產(chǎn)品的設(shè)計(jì)意味著必須在有限的能量?jī)?chǔ)備下擠出更多的運(yùn)行時(shí)間。

　　盡管如此，大型加工廠都被要求處理許多獨(dú)立的I / O的任務(wù)，而他們大部分在低功耗空閑時(shí)間和睡眠狀態(tài)。由于電池運(yùn)行時(shí)間是用戶敏感的特性，工程師實(shí)時(shí)管理能量的能力可能決定了設(shè)計(jì)的成功。然而，物理學(xué)是物理學(xué)，我們只有這么多的選擇。幸運(yùn)的是，明智地使用我們所擁有的選擇和資源仍然可以產(chǎn)生令人滿意的結(jié)果。

　　This article looks at several large processors that have low-energy features and target designs demanding energy efficiency. It examines techniques for reducing power draw， how peripherals can be managed dynamically and what types of energy and current draw numbers these parts are able to both claim and achieve. While microcontroller pin counts vary from 5 to 500， I chose all 100-pin parts in their respective families for more of an apples-to-apples comparison. Principles and techniques work for even larger pin counts so the information presented here can be extrapolated. All parts， datasheets， app notes， and development kits referenced here can be found on Digi-Key’s website.