DS2438智能電池監(jiān)視器可用于便攜計(jì)算機(jī)、便攜/蜂窩電話以及手持式儀器等，這些應(yīng)用中需要密切監(jiān)視電池的實(shí)時(shí)性能。此篇主要介紹了DS2438 特性、應(yīng)用范圍、參考設(shè)計(jì)電路以及電路分析，幫助大家縮短設(shè)計(jì)時(shí)間。

DS2438特性：獨(dú)特的1-Wire接口僅需一個(gè)端口引腳即可進(jìn)行通信;為電池組提供唯一的64位序列號;片上電池溫度檢測省去熱敏電阻;二進(jìn)制歷時(shí)記錄器

DS2438典型應(yīng)用范圍：蜂窩電話;數(shù)碼相機(jī);數(shù)字?jǐn)z像機(jī);掌上電腦、手持終端

DS2438參考設(shè)計(jì)應(yīng)用電路：

圖1 DS2438內(nèi)部結(jié)構(gòu)圖

The DS2438 tracks the remaining capacity of a battery using the Integrated Current Accumulator (ICA).The ICA maintains a net accumulated total of current flowing into and out of the battery; therefore, the value stored in this register is an indication of the remaining capacity in a battery and may be used in performing fuel gauge functions.

圖2 DS2438參考設(shè)計(jì)圖

In addition, the DS2438 has another register that accumulates only charging (positive) current (CCA) and one that accumulates only discharging (negative) current (DCA).The CCA and DCA give the host system the information needed to determine the end of life of a rechargeable battery, based on total charge/discharge current over its lifetime.