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AN4538 Datasheet(PDF) 2 Page - STMicroelectronics

Part # AN4538
Description  Power consumption optimization with STM32F3xx microcontrollers
Download  25 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4538 Datasheet(HTML) 2 Page - STMicroelectronics

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Contents
AN4538
2/25
DocID026505 Rev 1
Contents
1
STM32F3xx microcontroller low-power overview . . . . . . . . . . . . . . . . . 5
1.1
Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1.1
STM32F3xxxx device power supply with an internal regulator . . . . . . . . 5
1.1.2
STM32F3x8xx device power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.1.3
Power supply summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.2
Power mode features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.3
Wake up from low-power modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.4
STM32F3xx microcontroller power saving techniques . . . . . . . . . . . . . . . 10
1.4.1
General techniques . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
1.4.2
Low-power features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2
STM32F3xx microcontroller low-power application example . . . . . . . 12
2.1
Application description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.1.1
Functional overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.1.2
Application modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.1.3
State machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.2
Software description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2.2.1
Architecture description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2.2.2
Peripherals configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2.3
How to use the application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.3.1
Environment setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.3.2
Application setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2.4
Application current consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2.4.1
Measuring current consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3
Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24


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