DS2438参考设计电路|智能电池监测器应用电路

DS2438智能电池监视器可用于便携计算机、便携/蜂窝电话以及手持式仪器等，这些应用中需要密切监视电池的实时性能。此篇主要介绍了DS2438 特性、应用范围、参考设计电路以及电路分析，帮助大家缩短设计时间。

DS2438特性：独特的1-Wire接口仅需一个端口引脚即可进行通信;为电池组提供唯一的64位序列号;片上电池温度检测省去热敏电阻;二进制历时记录器

DS2438典型应用范围：蜂窝电话;数码相机;数字摄像机;掌上电脑、手持终端

DS2438参考设计应用电路：

图1 DS2438内部结构图

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.

图2 DS2438参考设计图

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.