AN92584 Datasheet, PDF (24/42 Pages) Ramtron International Corporation – Designing for Low Power and Estimating Battery Life for BLE Applications

Designing for Low Power and Estimating Battery Life for BLE Applications
Figure 12. Usage and Current Profile
Sleep
Monitor
Morning
Jog
Device
OFF
Noon
Cycling
Device
OFF
Evening
Jog
Device Sleep
OFF Monitor
Time in a day
The battery life can be measured by a simple formula that combines the usage profile and the current profile, as
shown in Equation 1:
Equation 1. Battery Life
Where,
The current in any state is a function of the current consumed in the different blocks in that state. Broadly speaking,
this is the sum of the current consumed in the three major blocks, shown as:
Equation 2. Average current in a state
Where,
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Document No. 001-92584 Rev. *A
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