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STM32F373VC 数据表(PDF) 75 Page - STMicroelectronics |
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STM32F373VC 数据表(HTML) 75 Page - STMicroelectronics |
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75 / 131 page  DocID022691 Rev 4 75/131 STM32F37xxx Electrical characteristics 114 For CL1 and CL2, it is recommended to use high-quality external ceramic capacitors in the 5 pF to 20 pF range (typ.), designed for high-frequency applications, and selected to match the requirements of the crystal or resonator (see Figure 14). 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. PCB and MCU pin capacitance must be included (10 pF can be used as a rough estimate of the combined pin and board capacitance) when sizing CL1 and CL2. Note: For information on electing the crystal, refer to the application note AN2867 “Oscillator design guide for ST microcontrollers” available from the ST website www.st.com. Figure 14. Typical application with an 8 MHz crystal 1. REXT value depends on the crystal characteristics. MS19876V1 OSC_OU T OSC_IN fHSE CL1 RF 8 MH z resonator REXT(1) CL2 Resonator with integrated capacitors Bias controlled gain |
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