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AN2629 Datasheet(PDF) 39 Page - STMicroelectronics |
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AN2629 Datasheet(HTML) 39 Page - STMicroelectronics |
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39 / 43 page  AN2629 Using the Stop and Standby mode in battery-operated applications Doc ID 13922 Rev 2 39/43 7.5 Conclusion These examples show that the Cortex-M3 integrates the very efficient Core-level instructions for low-power applications (Sleep mode and Deepsleep mode), associated with the low-power features of the STM32F10xxx (AWU, Stop, Low-power and Standby). Measurements show that the trade-off between wakeup time and power consumption must be taken into account: ● The Standby mode is more efficient in terms of power saving (3.6 µA), but the application restarts each time from the reset states and the time to reinitialize the application is not negligible. Indeed the initialization phase is done at 8 MHz and draws power. If the repeated time loop is too short (20 ms), this mode is less efficient than the Stop mode (106 µA versus 34.7 µA). ● The Stop mode is less efficient than the Standby mode in terms of low-power consumption, but it has the advantage of keeping the context and the RAM contents. In this example, if the repeated time loop is shorter than 200 ms, the Stop mode is more efficient, especially if the loop code is remapped to run in RAM. If the loop lasts 200 ms or more, however, the Standby mode becomes more advantageous. |
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