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STM32L151VD Datasheet(PDF) 77 Page - STMicroelectronics |
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STM32L151VD Datasheet(HTML) 77 Page - STMicroelectronics |
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77 / 140 page  STM32L151xD STM32L152xD Electrical characteristics Doc ID 022027 Rev 6 77/140 Note: 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 16). 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. Caution: 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 you choose a resonator with a load capacitance of CL = 6 pF and Cstray = 2 pF, then CL1 = CL2 = 8 pF. Figure 16. Typical application with a 32.768 kHz crystal ai17853 OSC32_OU T OSC32_IN fLSE CL1 RF STM32L15xxx 32.768 kH z resonator CL2 Resonator with integrated capacitors Bias controlled gain |
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