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STM32WB35CC bảng dữ liệu(PDF) 121 Page - STMicroelectronics

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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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STM32WB35CC bảng dữ liệu(HTML) 121 Page - STMicroelectronics

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DS11929 Rev 11
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STM32WB55xx STM32WB35xx
Electrical characteristics
169
Note:
For information on selecting the crystal refer to application note AN2867 “Oscillator design
guide for STM8S, STM8A and STM32 microcontrollers” available from www.st.com.
Figure 22. Typical application with a 32.768 kHz crystal
Note:
No external resistors are required between OSC32_IN and OSC32_OUT, and it is forbidden
to add one.
In bypass mode the LSE oscillator is switched off and the input pin is a standard GPIO.
The external clock signal has to respect the I/O characteristics detailed in Section 6.3.17.
The recommend clock input waveform is shown in Figure 23.
Figure 23. Low-speed external clock source AC timing diagram
1. Guaranteed by design.
2. tSU(LSE) is the startup time measured from the moment it is enabled (by software) until a stable 32 kHz oscillation is
reached. This value is measured for a standard crystal and it can vary significantly with the crystal manufacturer.
MS30253V2
OSC32_IN
OSC32_OUT
Drive
programmable
amplifier
fLSE
32.768 kHz
resonator
Resonator with integrated
capacitors
CL1
CL2
MS19215V2
VLSEH
tf(LSE)
90%
10%
TLSE
t
tr(LSE)
VLSEL
tw(LSEH)
tw(LSEL)



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