AN2476 datasheet(47/49 Pages) STMICROELECTRONICS

Part #	AN2476

Description	STR75x low power modes

PDF	49 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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47 / 49 page

AN2476

Conclusion

47/49

Conclusion

Before choosing clock and regulator configuration it is important to verify the application

requirements not only for the consumption but also in terms of the wake-up time, the

peripheral availibilty and whether the RAM contents need to be preserved until wake-up. For

example, in STOP mode the SRAM content is preserved, however in Standby mode, SRAM

content is lost.

There are therefore compromises to be made between firstly the wake-up time and the

consumption, and secondly the preservation of the SRAM contents and the peripheral

availability.

For example, the measured mode STOP_FLASH_PLL_Off shown in Table 14 on page 45

uses roughly double the power consumption as the STOP_OSC4M_Off mode, however it is

able to react faster by having a much reduced wake-up time.

AN2476 Datasheet(PDF) 47 Page - STMicroelectronics