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STM32F101C4T6XXX Datasheet(PDF) 44 Page - STMicroelectronics |
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STM32F101C4T6XXX Datasheet(HTML) 44 Page - STMicroelectronics |
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44 / 73 page  Electrical characteristics STM32F101x4, STM32F101x6 44/74 Doc ID 15058 Rev 3 resonator manufacturer for more details on the resonator characteristics (frequency, package, accuracy). 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. 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 20. Typical application with a 32.768 kHz crystal Table 22. LSE oscillator characteristics (fLSE = 32.768 kHz) (1) 1. Based on characterization, not tested in production. Symbol Parameter Conditions Min Typ Max Unit RF Feedback resistor 5 M C(2) 2. Refer to the note and caution paragraphs below the table, and to the application note AN2867 “Oscillator design guide for ST microcontrollers”. Recommended load capacitance versus equivalent serial resistance of the crystal (RS) (3) 3. The oscillator selection can be optimized in terms of supply current using an high quality resonator with small RS value for example MSIV-TIN32.768 kHz. Refer to crystal manufacturer for more details RS = 30 K 15 pF I2 LSE driving current VDD = 3.3 V VIN = VSS 1.4 µA gm Oscillator transconductance 5 µA/V tSU(LSE) (4) 4. 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 resonator and it can vary significantly with the crystal manufacturer Startup time VDD is stabilized 3 s ai14129b OSC32_OU T OSC32_IN fLSE CL1 RF STM32F10xxx 32.768 KH z resonator Resonator with integrated capacitors Bias controlled gain CL2 |
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