Lithium Coin-Cell Batteries : Predicting an Application Lifetime
By Rend at 20 March, 2010, 3:19 am
This application note explains about various contributors to battery capacity consumption in a battery backed application, and how to predict battery lifetime in a system. The issues about how to predict the battery lifetime is eplained in detail in Sample Lifetime Calculations section. This application note is divided into 7 section: Why Battery Backup?, IC Current Demands, Battery Construction/Attributes, Battery Testing/Screening, Sample Lifetime Calculations, Integrated Battery Controllers, Battery Module Products, and Conclusion.
Why battery backup? section talks about the reason why need battery backup, Battery-backed SRAMs, and disadvantage of battery-backed SRAM. The explaination about the IC (SRAM or RTC) current demand, battery-backed products, and battery capacities are described in the section IC Current Demands. The section Battery construction/Attributes explains about primary lithium coin-cell batteries, construction of the battery, voltage Distributions and indication of an abnormal IC or battery.
The description about Battery Testing, battery Screening, visual sampling of the batteries, and internal leakage of the battery are explained in detail in section Battery Testing/Screening. Battery Reliability Model section talks about balanced construction, The key components, The reliability model and Calculating the lifetime of the battery. The example of how to predict lifetime is talked in Sample Lifetime Calculations section. The issues about battery controller, standalone battery controllers, and lithium battery construction are described in Integrated Battery Controllers section. The Battery Module Products and conclusion section talks about module product that contains the battery controller and battery, “Sleep Mode” function and the conclusion of this application note.
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