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AN2629 bảng dữ liệu(PDF) 39 Page - STMicroelectronics

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AN2629 bảng dữ liệu(HTML) 39 Page - STMicroelectronics

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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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