STM32L151V6T6DTR 查看數據表（PDF） - STMicroelectronics
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STM32L151V6T6DTR
STMicroelectronics
STM32L151V6T6DTR Datasheet PDF : 133 Pages
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Electrical characteristics
STM32L151x6/8/B STM32L152x6/8/B
4.
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time measured from the
is reached. This value is
moment it is enabled (by software) to a stabilized
measured for a standard crystal resonator and it can
vary
significantly with the crystal manufacturer.
Note:
Caution:
For CL1 and CL2, it is recommended to use high-quality ceramic capacitors in the 5 pF to
15 pF range selected to match the requirements of the crystal or resonator (see Figure 18 ).
CL1 and CL2, are usually the same size. The crystal manufacturer typically specifies a load
capacitance which is the series combination of CL1 and CL2.
Load capacitance CL has the following formula: CL = CL1 x CL2 / (CL1 + CL2) + Cstray
where Cstray is the pin capacitance and board or trace PCB-related capacitance. Typically,
it is between 2 pF and 7 pF.
To avoid exceeding the maximum value of CL1 and CL2 (15 pF) it is strongly recommended
to use a resonator with a load capacitance CL ≤ 7 pF. Never use a resonator with a load
capacitance of 12.5 pF.
Example: if a resonator is chosen with a load capacitance of CL = 6 pF and Cstray = 2 pF,
then CL1 = CL2 = 8 pF.
Figure 18. Typical application with a 32.768 kHz crystal
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DocID17659 Rev 12
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