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STM32L431 bảng dữ liệu(PDF) 112 Page - STMicroelectronics

tên linh kiện STM32L431
Giải thích chi tiết về linh kiện  RTC with HW calendar, alarms and calibration
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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STM32L431 bảng dữ liệu(HTML) 112 Page - STMicroelectronics

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Electrical characteristics
STM32L431xx
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DocID028800 Rev 1
Note:
For information on selecting the crystal, refer to the application note AN2867 “Oscillator
design guide for ST microcontrollers” available from the ST website www.st.com.
Figure 23. Typical application with a 32.768 kHz crystal
Note:
An external resistor is not required between OSC32_IN and OSC32_OUT and it is forbidden
to add one.
1. Guaranteed by design.
2. Refer to the note and caution paragraphs below the table, and to the application note AN2867 “Oscillator design guide for
ST microcontrollers”.
3.
tSU(LSE) is the startup time measured from the moment it is enabled (by software) to a stabilized 32.768 kHz oscillation is
reached. This value is measured for a standard crystal and it can vary significantly with the crystal manufacturer



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