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AN3307 Datasheet(PDF) 28 Page - STMicroelectronics

Part # AN3307
Description  Guidelines for obtaining IEC 60335 Class B certification for any STM32 application
PDF  37 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3307 Datasheet(HTML) 28 Page - STMicroelectronics

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Class B solution structure
AN3307
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Doc ID 18186 Rev 4
interval (more than +/- 25% of its nominal value), the CPU clock source is immediately
switched back to HSI, and HSE fail status is returned. Otherwise the test returns the OK
status. In either case, the CPU clock is switched back to the default HSI source after the test
is finished.
Figure 13.
Clock frequency measurement principle
MS18599V1
Accepted
range
SysTick
Timer
(on HSI / HSE)
RTC Timer
(always on LSE)
F ~ Ref
F << Ref
F >> Ref
Run time measurement
Initial reference
measurement
Reference level
Zero level
Auto reload level
Zero level



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