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MSP430L092 Introduction Slide 6

In this slide, a live scenario of how such low power numbers translate to a lifetime of a single-cell rechargeable battery. This model is chosen because it is applicable to most targeted applications, such as consumer electronics that are intended to be used over a long period of time. When the usage is five minutes per day in active mode and the rest of the time it is spent in LPM4, the battery should last for roughly five years. Looking from a different perspective, if kept on the LPM4, this lifetime becomes 1,800 days. This time becomes 1,500 hours wherein the device stays in the active mode continuously. The graph shows the degradation pattern of the rechargeable battery per battery cycle or charge/discharge cycle. In the initial cycle, the battery has a higher voltage during shelf life, which drops to a regular maximum of 1.5 V upon first use. Using the current profile described in this chart, each battery cycle lasts for about 60 to 100 days. This accounts for a natural battery discharge, as well as power consumption from the L092. With the battery’s spec for roughly 30 battery cycles, this translates to roughly five years of lifetime out of a single-cell rechargeable battery.

PTM Published on: 2011-04-08